Air Force Needs Antennas for Future
High-Power Microwave
Weapons
"U.S. Air Force researchers are asking industry
to develop power sources and antennas for future
high-power microwave weapons and for other aerospace
and defense uses. Officials of the Air Force Research Laboratory at Kirtland Air
Force Base, N.M., released a solicitation Tuesday for the source and antenna portion
of the High-Powered Electromagnetics (HPEM) research program. The overall HPEM project
seeks to develop high-power electromagnetics technologies not only for directed-energy
weapons, but also for cyber warfare, EW, electronics-killing weapons
..."
Cobham Universal Spring Mount
Antenna Range Sticks
Its Neck Out
Cobham Antenna Systems announces the launch
of a dual-band, Gooseneck addition to the
'Universal' spring mount range of omni-directional
antennas. The Gooseneck antenna, along with a selection of the 'Universal' spring
mount antennas, will be available to view on Cobham's booth #1319 at (AUVSI's) XPONENTIAL
2016 in New Orleans, Louisiana. The OA2-2.3V-5.2V/2358 is a ground plane independent,
dual band antenna which covers the frequency ranges 2.10 – 2.60 GHz and 4.40 – 6.00
GHz, offering 4 dBi gain in the higher frequencies
...
API Intros Miniature, In-Line,
Coaxial Rotary Joints
"API Technologies offers a standard line of
rotary joints,
formerly manufactured by Sage Labs, suitable for use in commercial and military
applications. The term rotary joint describes a device used to transmit energy from
a stationary RF line to a rotating RF line." The 345 and 351 series covers DC to
40 with VSWRs in the 1.2:1 to 1.75:1 range. Peak power handling is 500 W. Max rotation
rate is 100 rpm. SMA & 2.92 mm connectors. WOW is the per revolution variation,
same as with audio equipment
...
The Wives and Mothers
of Radio Amateurs
How well received do you think this social
concept would be in today's easily offended world: "To bring together socially the
Wives and Mothers of Dallas Radio Amateurs; to promote mutual sympathy, counsel,
and interest in our husband's and our son's hobby; and with a realization that theirs
is an outstanding, fascinating, far-reaching and educational hobby, it is our desire
to further their interests in whatever way may present itself." It would be roundly
criticized as a backward, misogynistic, 1930-era mindset intended to subject women
to yet another form of domestic slavery beyond housekeeping and child rearing -
no doubt thought up by a man. Anyone thinking so
...
The Auto Industry's Latest
and Greatest Engines
I've said before that if you want a place
to see great engineering-related slideshows, it's hard to beat the subjects that
Charles Murray and Rob Spiegel come up with on the
Design News website.
Motorheads will definitely appreciate these images of some of the most high-tech
production engines ever built. The blue anodizing on Ford's 1.0-liter, turbocharged,
three-cylinder
EcoBoost engine is incentive to do like in the
1950s-70s and cut a hole in the hood to show off the craftsmanship. However, its
diminutive size would allow it to fit into an airplane's overhead luggage compartment
so the effect would not be as impressive as a big block Chevy engine with a raised
intake manifold, blower, and four-barrel Holley carburetor sticking out
..."
Tesseract Antique Instruments
My introduction to a
tesseract was
during an episode of Carl Sagan's "Cosmos" series in the 1980s, where he was demonstrating
how beings in of dimension N would perceive items of dimension N+1. The tesseract,
Sagan explained, is a 3-dimensional projection of 4-dimension hypercube. Watch the
embedded video for more information. The Tesseract website, which has nothing to
do with a hypercube as far as I can tell, deals in some very cool antique scientific
instruments. I learned of it from an article in Astronomy magazine where an editor
recommended it when researching the potential value of a collectible telescope.
Run by Drs. David and Yola Coffeen, Tesseract has a huge inventory of items
...
FCC Invites Comments on Eliminating
15 dB Gain Limit
on Amateur Amps
Well it's about time this antiquated rule
was abolished! "Expert maintains that the 15 dB gain limitation is an unneeded holdover
from the days when amplifiers were less efficient and the FCC was attempting to
rein in the use of Amateur Service amplifiers by Citizens Band operators
(aka CBers). While the FCC proposed in its 2004 Notice
of Proposed Rulemaking and Order in WT Docket 04-140 to delete the requirement that
amplifiers be designed to use a minimum of 50 W of drive power and subsequently
did so, it did not further discuss the
15 dB gain limit in the subsequent Report. 'There
is no technical or regulatory reason an amplifier capable of being driven to full
legal output by even a fraction of a watt should not be available to Amateur Radio
operators
..."
Multi-Impedance Dipole Antennas
Maybe I suffer from cranial rectumitis at
the moment, but I'm having a hard time with a statement made about coaxial feedline
impedance, to wit, "102-ohm line (52-ohm lines in series)." I must be missing something
because I don't understand how placing two 52-ohm transmission cables in series
results in twice the impedance. Aside from that, author John Avery presents an interesting
article on
multi-impedance
dipole antennas. Empirical data is presented on how the feedpoint impedance
of a dipole varies with distance above the ground. His results are very close to
theoretical values which assumes non-sagging elements, perfectly linear alignment,
a perfectly conductive ground, etc. He then extended his investigation into 2-wire
(4x impedance)
...
MACOM Sues Infineon Technologies
4G/LTE and 5G Semiconductors
MACOM Technology Solutions Holdings, a leading
supplier of high-performance analog RF, microwave, millimeterwave and photonic semiconductor
products, today announced that it has initiated legal action against Infineon Technologies
and International Rectifier (acquired by Infineon in 2015),
to defend its rights to use the pioneering and patented
GaN technology developed by Nitronex (acquired by MACOM
in 2014) in MACOM's core markets. GaN is a next-generation technology that
promises to improve network data service and cell coverage of 4G/LTE and 5G basestations
while reducing their energy consumption and associated carbon footprint
...
Physical Layer Measurement for Next
Gen 5G/IoT Wired
Communications
Free downloadable whitepaper from Anritsu.
"This paper outlines some high-speed standards for next-generation communications
and describes some physical-layer measurement techniques, targeting the era of
5G and
IoT. • Need for 5G/IoT Generation • Wired Networks Faster • Wired Communications
Measurement Challenges in Next-Generation Interconnects
..."
Single-Atom Magnet Breaks
New Ground for Data Storage
"EPFL scientists have built a single-atom
magnet that is the most stable to-date. The breakthrough paves the way for the scalable
production of
miniature magnetic storage devices. Magnetic
storage devices such as computer hard drives or memory cards are widespread today.
But as computer technology grows smaller, there is a need to also miniaturize data
storage. This is epitomized by an effort to build magnets the size of a single atom.
However, a magnet that small is very hard to keep 'magnetized,' which means that
it would be unable to retain information for a meaningful
..."
Much Appreciation for Windfreak's
Continued Support!
Windfreak Technologies was created with the
vision of providing low cost, quality, innovative RF products that can be
used in a wide range of highly technical applications
for a wide range of customers, from hobbyists to education facilities to government
agencies. Windfreak designs, manufactures, tests and sells high value USB powered
and controlled radio frequency products such as RF Signal Generators, RF Synthesizers,
RF Power Detectors, RF Mixers, RF Upconverters and RF
downconverters. Worldwide customers include
Europe, Australia, and Asia. Please visit Windfreak today!
Micro-Sized Liquid-Metal Particles
Created for Heat-Free
Soldering
"Martin Thuo likes to look for new, affordable
and clean ways to put science and technology to work in the world. His lab is dedicated
to an idea called frugal innovation: 'How do you do very high-level science or engineering
with very little?' said Thuo, an assistant professor of materials science and engineering
at Iowa State University and an associate of the U.S. DoE's Ames Laboratory. 'How
can you solve a problem with the least amount of resources?' That goal has Thuo
and his research group their materials expertise to study soft matter, single-molecule
electronics and renewable
..."
Editorial re FCC Potentially Shutting
Down Amateur
Radio During WWII
"Do you think that F.C.C. would be engaged
in the present terrific expense and effort of getting our fingerprints and citizenship
histories if there were intention of shutting us down shortly?" That statement was
printed by the QST magazine editor in the issue that preceded the December
7, 1941, attack on Pearl Harbor by thirteen months. A few things about it are troubling.
First, the FCC was
collecting fingerprints of licensed amateur radio operators. Second, the FCC
was assimilating information about licensed amateur radio operators' citizenship
histories. Third, a combination of short-sightedness and apparent naiveté concerning
the FCC's willingness to shut down amateur radio operations once
...
Graphene Doped with Hydrogen
Reveals Its Magnetism
"Hydrogen atoms can induce
magnetism in graphene and be used to create a
uniform magnetic order across the 1D material. That is the finding of researchers
in Spain, France and Egypt, who also demonstrated that it is possible to atomically
manipulate hydrogen atoms on graphene to control the local magnetic state. Graphene
is a sheet of carbon just one atom thick that has a number of unique properties.
But it is not magnetic. 'The incorporation of magnetism to the long list of graphene
capabilities
..."
The "Fair Use" Doctrine
and the U.S. Copyright Office
"The Congress shall have Power … To
promote the Progress of Science and useful Arts, by securing for limited Tımes to
Authors and Inventors the exclusive Right to their respective Writings and Discoveries."
- United States Constitution, Article I, Section 8. Therein lies the authority for
legislation and prosecution of rights for virtually every human creation within
the jurisdiction of the country. Each nation has it own version, and international
agreements help assure universal protection of a creator's rights of ownership;
e.g., the "Convention for the Protection of Literary and Artistic Works" of 1886
and the World Intellectual Property Organization. America has the U.S. Copyright
Office. Those of us involved in presenting information and referring to legally
protected
...
World’s Fastest Silicon-Based
Flexible Transistors
"Engineers at the University of Wisconsin-Madison
have found an inexpensive, easy way to make
flexible transistors. The manufacturing method can easily be
repeated and scaled up, but the most exciting development is the transistor itself.
It is faster than any other silicon-based flexible transistor, and it is capable
of wirelessly transferring data or power. The transistor operates at a record 38
GHz, and the researchers estimate that it could even operate as fast as 110 GHz,
which would give computers incredibly fast processing speeds. The transistor's record-setting
performance is because of a unique, 3-D current-flow pattern that makes it
..."
Nova Microwave Is Continuing Its
Support of RF Cafe
- Thanks!
Nova Microwave, located in Clearwater, Florida
specializes in the design, engineering and manufacturing of a broad range of
Ferrite Circulators and Isolators. Nova Microwave
is a leader in technically differentiated electronic and radio frequency Ferrite
circulators and isolators that connect, protect and control critical systems for
the global microwave electronics market place including
commercial and military wireless telecommunications.
Our staff is dedicated to research and development of standard and custom design
quality ferrite circulators and isolators from 380 MHz to 26.5 GHz
...
Nanotubes Serve as Light Emitter
in Integrated Photonic
Circuit
"Using
fiber optic cables as waveguides for transmitting
light that is ultimately converted into voice calls or data has been a mainstay
for the telecommunications industry for decades. But it's been a massive struggle
to adapt this kind of technology to the scale of a microchip so that photons carry
data through an integrated circuit instead of electrons. Now researchers at Karlsruhe
Institute of Technology (KIT) in Germany have tackled a major problem in making
integrated optical circuits a reality by creating nanoscale photonic emitters with
tailored optical
..."
Notable Tech Quote
"We are an operational squadron. We are supposed
to be flying jets, not building them." -
Lt. Col. Harry Thomas,, commanding officer of
VMFA-312, a Marine Corps F/A-18 squadron based at Beaufort, remarking in a story
about how only 30% of the USMC air fleet is actually air worthy.
Astronomy and Amateur Radio
It is always nice to read an article that
encompasses more than one of my hobbies, whether it be amateur radio and amateur
astronomy like this one, amateur radio and model rocketry, or amateur radio and
radio controlled airplanes. I don't recall ever seeing an article that combined
astronomy and model airplanes. In this QST piece, author Hollis French
expounds on the necessity for Hams to understand the effects that
atmospheric phenomena, caused primarily by our sun's periodic and intermittent
activity, have on radio signal propagation. Properties of the ionospheric layers
had by 1943 been pretty well surmised based on cause and effect relationships since
at the time no sounding rockets had been launched into the upper atmosphere to obtain
in situ
...
FCC Commissioner Wants Tests on
5.9 GHz to Expand WiFi
Access
"FCC Jessica Rosenworcel told a group of industry
representatives that the 5.9 GHz band is "our best near shot for having more WiFi"
and called for tests to ensure that it can be effectively used for this purpose.
Rosenworcel was speaking at the
WiFi Now conference held at the Sheraton Hotel
here. The conference featured looks at some innovations in WiFi as well as new ways
to monetize this primarily free service. Perhaps the most important innovation came
from Edgewater Wireless, which has developed a means for producing radio chips with
three discrete
..."
Antique Dining Room Table Redesign
When Melanie's mother
needed to be moved into an extensive care facility, we inherited the family's
antique dining room table. It was manufactured by the James Pleukharp
company, located in Ohio. Similar models were made sometime in the late 19th and
early 20th centuries. The rounded end panels drop down and the center section expands
to hold up to six leaf panels to a total of 105". With no leaves the table is nearly
round with a 45" diameter. A very greenish poplar comprises the solid 3/4" tabletop
and turned legs, with oak used for the sliding expansion mechanism. Surprisingly,
a thick walnut plank ran across the frame to support the center leg
...
JCS Mulls Newest Domain:
Electromagnetic Spectrum
"The Vice-Chairman of the Joint Chiefs of
Staff is taking a "very serious" look at to making the electromagnetic spectrum
a formal "domain" of military operations, a top aide to the Pentagon’s
chief information officer told me this morning. The move would elevate the ethereal
realm of radio waves and radar to the same level of importance as land, sea, air,
space, and cyberspace, with ramifications rippling across the military's budget,
training, and organization. We’ve written for years about the military’s anxiety
that it has "lost the electromagnetic spectrum" to increasingly sophisticated adversaries
like Russia and China, who can jam or spoof
..."
Way-Cool-Looking
Microwave Components
A little over a year ago, I posted photos
and info on a few really cool-looking RF devices that make me wish I had a use for
them, or at least had examples to put on display as conversation pieces. Usually
the components look the way they do purely due to functional necessity, but sometimes
I think the designers intentionally add a little bit of 'wow' factor to them. Waveguide
components tend to dominate. At the time, I could not find a hyperlink to Sage Millimeter's
Space Qualified 26.8 GHz Integrated Transmitter Module; however,
thanks to a recent e-mail from a nice lady from the company, there is now a link
to the datasheet ...
Inside One of the World’s Most
Secretive iPhone Factories
This story reminds me of carefully scripted
'tours' given by Communist regimes to outside agencies to demonstrate how humane
and open their society really is. "A few minutes past 9 a.m. at Pegatron Corp.'s
vast factory on Shanghai's outskirts, thousands of workers dressed in pink jackets
are getting ready to make
iPhones. The men and women stare into face scanners
and swipe badges at security turnstiles to clock in. The strict ID checks are there
to make sure they don't work excessive overtime. The process takes less than two
seconds. This is the realm in which the world's most profitable smartphones are
made
..."
Electronics-Themed Comics
The weekend is over and it's time to hunker
down for five long days of grueling work. Most of the
electronics-themed comics that appeared in QST magazine were associated
directly with particular columns. For example, the cartoons featuring 'Jeeves,'
the overtaxed manservant of a never-seen house master, was part of the "How's DX"
feature. Drawn by artist Phil Glidersleeve (aka 'Gil'), W1CJD, poor Jeeves was often
found doing his boss's will in the most precarious situation with intemperate weather
making his assignments tough to complete. Situations involving Podunk Hollow Radio
Club were frequent subjects of Gil's drawing pen as well. Enjoy
...
Keysight Series of "How to Design
an RF Power Amplifier"
Videos
Keysight EEsof EDA has released a series
of five
RF power amplifier (PA) design videos intended to provide engineers with the
building blocks to design more complex PA classes (i.e., A, AB, B, F, E and J).
While PAs are used everywhere, their large signal nonlinear nature makes designing
them difficult. Moreover, the idealized waveforms that define textbook classes of
operation are problematic, if not impossible, to realize using a real device
...
Algorithm Streamlines 4G/5G
Antenna Design Time
"The antennas for smartphones capable of
operating anywhere in the world at 4G and in the future at 5G, are becoming progressively
more difficult to design with all the different frequencies they must transmit and
receive. The answer, already being used in advanced design is multiple-input multiple-output
(MIMO) antennas (also called multi-port
antennas) that can dissect the frequency band cheaply and efficiently. Unfortunately,
today's experienced antenna designers use "black magic" (their
experience and savvy) to guess at what
..."
Mucho Thanks to Res-Net Microwave
for It's Continued
Support!
Res-Net Microwave manufactures a complete
line of precision RF &
microwave components including microwave attenuators, microwave
terminations, microwave resistors, and now diode
detectors for commercial, military, and space applications. The company is a leader
in development and production of the films required for
these type of RF/microwave components. In addition
to an extensive selection of standard products, Res-Net offers custom designed and
manufactured products using their state-of-the-art CAD/CAM resources for all their
...
Magnetic-Free Circulator
Helps Double Wi-Fi Speed
"Full-duplex radio ICs that can be implemented
in nanoscale CMOS to enable simultaneous transmission and reception at the same
frequency in a wireless radio were first invented last year by Columbia Engineering
researchers. That system required two antennas, one for the transmitter and one
for the receiver. Now the team has developed a breakthrough technology that needs
only one antenna, thus enabling an even smaller overall system. 'Our circulator
is the first to be put on a silicon chip
..."
NuWaves Engineering Intros 10 W
VHF - S-Band RF Power
Amplifier
NuWaves Engineering, an international
RF and microwave solutions
provider, announced the upcoming release of an upgraded broadband RF PA for VHF
to S-band transmitters and data radios, the
NuPower™ 11B02A model, featuring high power efficiency and multi-octave operation
in a compact package. The NuPower 11B02A model, part number NW-PA-11B02A, will replace
the NuPower Mini Multi-Octave Power Amplifier model, part number NW-SSPA-MINI-10W-0.225-2.6,
delivering a minimum of 7 Watts, and typically 10 Watts, of RF power from 225 to
2600 MHz when driven with a 3 dBm RF input signal ...
The Atom Without Properties
"The microscopic world is governed by the
rules of quantum mechanics, where the properties of a particle can be completely
undetermined and yet strongly correlated with those of other particles. Physicists
from the University of Basel have observed these so-called
Bell correlations for the first time between hundreds of atoms.
Their findings are published in the scientific journal Science. Everyday objects
possess properties independently of each other and regardless of whether we observe
them or not. Einstein famously asked whether the moon
..."
Balloon-Supported Antennas
Kite- and balloon-lifted antennas are very
popular in the amateur radio realm. They are primarily used for short-term activity
such as during a contest or during an emergency; however, some operators use them
on a more extended basis. A really good series of articles on the use of balloons
and kites for suspending antennas can be found
here.
Equations for calculating necessary balloon and kite sizes and predicting wind effects
are included along with lists of 'Dos' and 'Don'ts.' This is not a new phenomenon.
A 1940 edition of QST magazine described how to employ weather and sounding
balloons to provide needed antenna configurations
...
Graphene Filters Could Unlock
Ultra-Fast Wireless
Speeds
"Buried in the wilderness between microwaves
and infrared light is part of the electromagnetic spectrum known as the terahertz
gap. The term comes from the relative lack of wireless technology that is capable
of transmitting or receiving these ultra-high frequency bands. Now, researchers
from the Ecole Polytechnique Federale de Lausanne (EPFL) and University of Geneva
have invented a
graphene filter that could make terahertz antennas more efficient
and practical. The new microchip blocks out rouge signals that interfere
..."
R/C Russian Antonov AN-225
and Buran Spaceplane
A lot of people view the videos I post of
giant scale radio controlled model airplanes, so this one should be of interest.
It shows a
Russian Antonov AN-225 performing a mid-air launch of a piggybacked Buran spaceplane
(which by pure coincidence looks like the U.S. Space Shuttle).
Drama ensues during the separation phase. As is often the case, we thank our German
modeling brethren for for this magnificent craft
...
Army Speeds up Its
Battlefield SATCOM
"The Army has been speeding up its global
satellite constellation, designed to give soldiers quick access to global communications
using portable equipment, into service. The
Wideband Global Satellite, or WSG-1, operates
at 12 times of the speed of the legacy Defense Satellite Communications System.
Users in the western Pacific recently transitioned to WSG-1 following six months
of testing, the Army said in a release. DSCS, which has been in operation since
the 1960s, with the latest versions launched in the 1980s and '90s, transmitted
..."
Team Builds 1st Quantum
Cascade Laser on Silicon
"A team of researchers from across the country,
led by Alexander Spott, University of California, have built the first
quantum cascade laser on silicon. The advance may have applications
that span from chemical bond spectroscopy and gas sensing, to astronomy and free-space
communications. Integrating lasers directly on silicon chips is challenging, but
it is much more efficient and compact than coupling external laser light to the
chips. The indirect bandgap of silicon makes it difficult to build a laser out of
silicon, but diode lasers can be built
..."
Many Thanks to Anatech Electronics
for Long-Time Support!
Anatech Electronics (AEI) manufactures and
supplies RF and microwave
filters for military and commercial communication systems, providing standard
and custom RF filters, and RF products. Standard RF filter and cable assembly products
are
published in our website database for ease
of procurement. Custom RF filters designs are used when a standard cannot be found,
or the requirements dictate a custom approach. Please visit Anatech today to see
how they can help your project succeed!
KR Electronics Intros 1100 MHz
Bandpass Filter
KR Electronics has introduced a new
1100 MHz bandpass filter design, part number
3260-1100.
The filter has a minimum 2 dB bandwidth of 400 MHz. An elliptic type filter
is used for high selectivity. Typical insertion loss is 1 dB . The filter is
supplied in a small surface mount package measuring .2" x 0.38" x 0.25". Other frequencies
and bandwidths are available. Please visit KR Electronics today to see whether their products can be of
use to you.
DARPA Project Could
Double Wireless Capacity
"Pentagon-funded researchers have achieved
a breakthrough that could double the capacity of wireless communications, leading
to faster Web searches and downloads, by allowing devices to send and receive signals
with a single antenna. Smartphones and tablets tend to use at least two antennas
for transmitting and receiving signals. But Columbia University electrical engineers,
working as part of DARPA's
Arrays at Commercial Timescales (ACT) program,
have managed to miniaturize the electronic components and get radio frequency signals
to work in
..."
A Logic Named Joe :
The Internet Foretold?
Sci-fi writer William F. Jenkins, who went
by the pen name "Murray Leinster," wrote a short story titled
A Logic Named Joe, that
appeared in March 1946 issue of Astounding Science Fiction. In the story, an amazingly
prescient description of the modern Internet is laid out. The works is copyrighted
so I will not replicate the entire thing here, but these are a few excerpts that
sound a lot like Mr. Leinster was in cahoots with DARPA during the development
...
Newly Published RF & Microwave
Magazine Articles
Many great new RF-type magazine articles that
have appeared in the trade magazines in the last couple weeks. Since the majority
of people no longer receive paper copies of the magazines, I try to drive a little
traffic to their websites by highlighting titles that appeal to my interest and
like-minded RF Cafe visitors
...
•
Virtual Thru-Reflect-Line (TRL)
Calibration, J. Penn
•
Process Wide Bandwidths in
Aerospace/Defense Systems,
I. Beavers
•
Multi-Tone Testing Multiplies Test
Solutions, C. DeMartino
•
First Pass Success with ASICS,
A. Rehman
<more>
What's Your RF Integration IQ?
Peregrine Semiconductor has created a quiz
titled "What's Your RF Integration IQ?" that tests your knowledge on
RF SOI (RF Silicon on Insulator), MCMs
(Multi-Chip Modules), Intelligent Integration, the
Ron Coff figure of merit, MPAC (monolithic phase and amplitude
controller), and other topics. The winner, which will be announced at IMS
2016, gets awarded $500. Attendees at the IMS show can submit their information
at the Peregrine booth (#2129) for another entry into
the $500 giveaway.
PMI New Product Releases
for April 2016
PMI Model No.
PEC-53-12-10-15-SFF is a 1.0 to 2.0 GHz LNA. This amplifier
has a minimum gain of 53 dB with ±0.75 dB flatness, OP1dB of +16 dBm
minimum and a noise figure of 0.7 dB typical. PMI Model No. P4T-100M50G-100-T-RD is an absorptive, SP4T PIN diode switch
operating over 0.1 to 50.0 GHz, with low insertion loss, high isolation, and
a TTL compatible. Specifications include insertion loss of 5 dB @18 GHz
and 14 dB @ 50 GHz, Isolation of 80 dB @50 GHz, switching speed
of 50 ns max, input power 20 dBm CW
...
Tesla Coil Remotely Induces
Nanotubes to Self Assemble
"Nikola Tesla conjured up all sorts of interesting
experiments for his famed 'Tesla Coils.' Today, however, their main use has been
relegated largely to impressing visitors at science museums. That is about to change.
Researchers at Rice University have used Tesla coils to get carbon nanotubes to
self-assemble into long chains, a phenomenon the scientists have dubbed 'Teslaphoresis.' Controlled assembly of nanomaterials
from the bottom up could be useful in applications including regenerative medicine
where the nanotubes would act as nerves as well as fabricating electronic circuits
without touching
..."
Strays
At first I thought maybe this was intended
to be an April Fools joke, being that it appeared in an April issue of QST,
but it is probably just a coincidence. One of the two topics refers to a 'door knob for UHF,'
which in reality was a glass-encased vacuum tube that was shaped a lot like one
of the old glass door knobs. The author penned a humorous take-off. On second thought,
maybe this is a Fool's edition now that I have read the second item. All kidding
aside, "Strays" concludes with a poem dedicated to those who became 'Silent Keys'
as a result of World War II
...
Ultrathin Organic Material
Enhances E-Skin Display
"University of Tokyo researchers have developed
an ultrathin, ultraflexible, protective layer and demonstrated its use by creating
an air-stable,
organic light-emitting diode
(OLED) display. This technology will enable creation
of electronic skin (e-skin) displays of blood oxygen
level, e-skin heart rate sensors for athletes and many other applications. Integrating
electronic devices with the human body to enhance or restore body function for biomedical
applications is the goal of researchers around the world. In particular, wearable
electronics need to be thin and flexible to minimize impact where they attach to
the body
..."
Peregrine Expands MPAC–Doherty
GaN Power
Amplifier Line
Peregrine Semiconductor, founder of RF SOI
(silicon on insulator) and pioneer of advanced RF
solutions, introduces two
UltraCMOS® MPAC–Doherty products—the PE46130
and PE46140. These monolithic phase and amplitude controllers
(MPAC) join the PE46120 in offering maximum phase-tuning
flexibility for Doherty PA optimization. Designed for the LTE and LTE-A wireless-infrastructure
transceiver market, the MPAC–Doherty product family now extends from 1.8 to 3.8
GHz with three separate, pin-compatible parts. "Phase and amplitude control is critical
to the future of communications, where everything from LTE and 5G to radar will
rely on the efficient exchange of data
...
The Problem with the Pentagon's
Hypersonic Missile
"The U.S. military is pouring money into hypersonic
research, and it’s making China and Russia - which have their own similar programs
- nervous. But the accelerating effort to build missiles that fly at speeds between
Mach 5 to Mach 19 is also alarming some in the nonproliferation community. Despite
Pentagon officials' assurances that superfast weapons will carry only conventional
warheads, some believe that other nations may well treat any hypersonic launch as
a potential nuclear strike
..."
RF Cafe Quiz #66: Spectrum and
Network Measurements
This quiz is based on the information presented
in
Spectrum
and Network Measurements, 2nd Edition, by Robert A. Witte. "This comprehensive
treatment of frequency domain measurements successfully consolidates all the pertinent
theory into one text. It covers the theory and practice of spectrum and network
measurements in electronic systems. It also provides thorough coverage of Fourier
analysis, transmission lines, intermodulation distortion, signal-to-noise ratio
and S-parameters."
GPS 2.0: Aerospace Corporation
Launches Second Draft
of GPS
"The Aerospace Corp. the people who brought
you the concept for GPS, are launching GPS 2.0. It all began when two Aerospace
Corps scientists J.R. Woodford Woodward and H. Nakamura penned a little-known briefing
In 1966, 'Navigation Satellite Study,' that paved the way. Tomorrow, the Aerospace
Corp. will issue a new study it hopes will pave the way for the next wave of GPS,
one much more resilient, much more resistant to jamming and tampering but boasting
accuracy that is at least as good as the current satellite-dependent system
..."
Stingray Tracking Devices:
Who's Got Them?
"The map below tracks what we know, based
on press reports and publicly available documents, about the use of
stingray tracking devices by state and local police departments.
Following the map is a list of the federal agencies known to have the technology.
The ACLU has identified 61 agencies in 23 states and the District of Columbia that
own stingrays, but because many agencies continue to shroud their purchase and use
of stingrays in secrecy, this map dramatically underrepresents the actual use of
stingrays by law enforcement agencies nationwide. Stingrays, also known as 'cell
site simulators' or 'IMSI catchers,' are invasive cell phone surveillance devices
that mimic cell phone towers
..."
KR Electronics Intros 1550 MHz
Bandpass Filter
KR Electronics has introduced a new
1550 MHz bandpass filter design, part number
3260-1550.
The filter has a minimum 1.5 dB bandwidth of 500 MHz, with stopband rejection
maintained to 9 GHz. Typical insertion loss is <1 dB. The filter is
supplied in a small surface mount package measuring 0.88" x 0.38" x 0.235".
Other frequencies and bandwidths are available. Please visit
KR Electronics today to see
whether their products can be of use to you.
Notable Tech Quote:
Justin Trudeau, Canadian
PM
"Don't get me going on this, or we'll be here
all day, trust me." -
Justin Trudeau, Prime Minister of Canada, after responding to
a snarky comment by a reporter who asked, "I was going to ask you to explain quantum
computing, but - when do you expect Canada's ISIL mission to begin again, and are
we not doing anything in the interim?" Trudeau slapped him down by answering, "Very
simply, normal computers work by either there's power going through a wire, or not.
It's 1, or a 0, they're binary systems. What quantum states allow for is much more
complex information to be encoded into a single bit." He then talks about matter
being both particles and waves at the same time, etc. This, from a politician? Whoa.
Reconfigured Tesla Coil Aligns,
Electrifies Materials
from Distance
"Scientists at Rice University have discovered
that the strong force field emitted by a Tesla coil causes carbon nanotubes to self-assemble
into long wires, a phenomenon they call 'Teslaphoresis..' The team led by Rice chemist Paul Cherukuri
reported its results this week in ACS Nano. Cherukuri sees this research as
setting a clear path toward scalable assembly of nanotubes from the bottom up. The
system works by remotely oscillating positive and negative charges in each nanotube,
causing them to chain together into long wires. Cherukuri's specially designed
..."
Folded and Loaded Antennas
Here is a fairly major treatise on
folded
and loaded antennas that appeared in a 1953 issue of QST magazine,
with "Suggestions for Mobile and Restricted-Space Radiators." It is not for the
faint of heart or anyone with mathphobia. Integral calculus is part of the presentation,
although an understanding of calculus is not required to get the gist of the article.
Equations for calculating the antenna configuration radiation resistances are given
for the 3λ/4-wave folded dipole, the λ/8-wave folded monopole, the bottom-,
center- and top-loaded λ/8-wave monopole, the bottom-loaded λ/16-wave monopole,
and the λ/4-wave monopole folded twice, to name
...
Facebook's Aquila Drone
Creates a Laser-Net in the
Sky
"Facebook's goal of networking the world means
extending communications to everyone on the planet. Facebook has started to test
new approaches to ground-based systems. And it's continuing to work on its futuristic
drone-based communications system,
Aquila. At the company's F8 developer conference
held in San Francisco today, Facebook vice president of engineering Jay Parikh talked
a little more about
Aquila's development, and how it would use laser links to bring
the internet to rural areas in developing countries. According to Parikh,
Facebook's UAV platform looks like a giant boomerang. 'We need to fly
..."
Cobham Intros First in a Range
of High Power Spiral
Antennas
Cobham Antenna Systems is pleased to announce
the
FPA-0.7-2.7R/2319,, which is the first in a new
range of high power, directional spiral antennas. The FPA-0.7-2.7R/2319 offers high
power, high gain and circular polarisation within a compact, low profile, rugged
housing. It is suitable for multi-band communications as well as cellular countermeasure
and security applications. The low profile housing means that this antenna can be
used to replace much larger and more expensive, Log-Periodic, Horn or Conical spiral
antennas and also be used in situations where height/profile is critical
...
Embroidery Makes Wearable Antennas
""'A revolution is happening in the textile
industry,' said engineer Professor John Volakis. 'We believe that functional textiles
are an enabling technology for communications and sensing, and even medical applications
like imaging and health monitoring.' While looking into using fabric techniques
to make brain implants with scientist Asimina Kiourti, he and she decided to apply
their ideas to create
wearables antennas. 'We asked, how can we functionalise
embroidered shapes? How do we make them transmit signals at useful frequencies?'
said Volakis
..."
Low Pressure Modulation
Author Howard Wright takes the opportunity
here to distill the
concept of modulation down to its basic operation while dispensing with the
garbled mix of "graphs, formulas, charts, vectors, diagrams, and Greek letters which
often enter into various discussions of modulation". Wright describes how to the
uninitiated radio dial spinner, the culmination of events occuring behind the scenes
in an AM reception is akin to knowing "that, to be reproduced, the picture [in a
magazine] was broken down into its primary colors, if all we had to go by was the
original print and the magazine?" That is a very apt comparison
...
Remembering the Technology Glitches
and Failures of
Tax Years Past
""Because we're nearing the end of tax season
here in the United States, I decided to examine the often volatile combination of
tax policy and IT systems. Tax-related problems are some of the most painful IT
failures, because they tend to hit citizens right where it hurts most: their bank
accounts. Below you'll find some of the most noteworthy operational glitches of
the past decade, but as with previous timelines, the incidents listed here are merely
the tip of the iceberg, and should be veiwed as being representative of
tax-related IT problems rather than comprehensive.
It doesn't even include incidents of tech-assisted fraud, data breaches, or failed
modernization projects
..."
