Homepage Archive - February 2018 (page 3)

These archive pages are provided in order to make it easier for you to find items that you remember seeing on the RF Cafe homepage. Of course probably the easiest way to find anything on the website is to use the "Search RF Cafe" box at the top of every page.

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See Page 1 | 2 | 3 of the February 2018 homepage archives.

Friday 23

Thursday 22

Church Spires to Boost Mobile Connections

Church Spires to Boost Mobile Connections - RF cafe"Church spires across the UK will be used to boost digital connectivity in rural areas following an agreement between the Government and the Church of England. The accord, signed by the the National Church Institutions (NCIs) of the Church of England, the Department for Digital, Culture, Media and Sport (DCMS) and the Department for the Environment, Food and Rural Affairs (Defra) encourages the Church of England to use its buildings and other property to improve broadband, mobile and WiFi connectivity for local ..."

Solid-State Scene: IC Comparators and Op Amps

Solid-State Scene: IC Comparators and Op Amps, May 1973 Popular Electronics - RF CafeIt is hard to imagine a time when integrated circuit (IC) comparators were a big deal, but as recently as 1973 when this article appeared in Popular Electronics, they were new to a designer's bag of tricks. Prior to an IC solution, comparators needed to be constructed from opamps and a handful of peripheral biasing components. As with other integrated circuits, not only does the overall price go down, but so does circuit board real estate, cost, temperature variability, and electrical parameter variance between devices. The first comparator circuit I remember designing was a temperature sensor that went in an oven used for curing the potting ...

ISSCC: 80 GHz Automotive Radar on One Chip

ISSCC: 80 GHz Automotive Radar on One Chip - RF cafe"Texas Instruments said 'yes' in an ISSCC paper devoted to a single-chip 76-81 GHz frequency-modulated continuous wave (FMCW) radar transceiver in 45 nm CMOS, which includes three transmitters, and four receivers with integrated ADCs. To support system-level functional safety, the design also features autonomous fault monitoring of the RF chain. The fast-chirp FMCW signal is generated in a closed-loop 19-20.25 GHz fractional-N frequency synthesizer, fed from a high frequency reference clock via ..."

Bluetooth Low-Energy Transceiver Slashes Consumption by over ½

Bluetooth Low-Energy Transceiver Slashes Consumption by over ½ - RF Cafe"Researchers at Tokyo Institute of Technology have announced a Bluetooth Low-Energy transceiver with the lowest ever power consumption, designed for use in the popular 2.4 GHz band. The breakthrough set to accelerate widespread adoption of Internet of Things (IoT) applications was developed by a group of researchers led by Kenichi Okada of Tokyo Institute of Technology, Japan. When transmitting, the transceiver consumes 2.9 milliwatts (mW) and when receiving, it consumes ..."

BeRex Fast Switching, High Isolation, SPDT Switch for Wi-Fi, CATV, IoT, 5G

BeRex Intros BSW7221 Fast Switching, High Isolation, Reflective SPDT Switch for Wi-Fi, CATV, IoT and 5G Applications - RF CafeBeRex continues to expand its family of RF switches by announcing the availability of the BSW7221, a high isolation, SPDT RF switch with high linearity, low insertion loss, and a very fast, 90 to 135 ns, switching time making it ideal for demanding wireless switching applications such as Wi-Fi, CATV IoT and 5G applications. Using a single 2.7 to 3.6 V supply voltage, the BSW7221 switch provides a wide 1 to 6000 MHz frequency range ...

The Electronics Handbook, Second Edition

The Electronics Handbook, Second Edition - RF CafeSometimes it's still nice to have a hard copy reference book on hand rather than clicking through a PDF file. This 2640-page, 2nd edition of The Electronics Handbook, published by CRC, is such a book. Peruse the "Look Inside" page samples and you will see it is like a compilation of undergraduate textbooks plus table, charts, and graphs chock full of data. Analog, digital, RF and electric power topics are included. Check it out ...

How Chrome Ad Blocking is Already Changing the Web

How Chrome Ad Blocking is Already Changing the Web - RF CafeIt's getting harder for companies to have their online advertisements seen by potential customers thanks to the popularity of ad blockers. Now, Google is building the ability into its own browser. "Google's browser doesn't go as far as full-on ad blockers and won't always stop ad trackers. But already it's cut ads on 42% of websites it's tangled with. What was once unthinkable - that Chrome would block online ads, Google's lifeblood - becomes reality on Thursday. That's when Chrome takes a significant step in the direction that hundreds of millions of us already have gone by installing ad blockers. Chrome stops far ..."

Wednesday 21

Variable-Capacitance Diodes

Variable-Capacitance Diodes, July 1969 Electronics World - RF CafeIt appears that maybe Abraham Lincoln had a son who was an electrical engineer working at Motorola Semiconductor back in the 1960's. Put glasses on Honest Abe (I did) and author Irwin Carroll's a spitting image of the Great Emancipator. Seriously though, this article is a great introduction to the fabrication and use of variable capacitance (aka varicap and varactor) diodes. They have been - and still are - used widely for electrically tunable oscillator and filter circuits. Topics such as temperature and figure of merit ("Q") are discussed as well. This edition of Electronics World ran a series ...

Washington's Birthday, Not Presidents Day

Washington's Birthday, Not Presidents Day - RF cafeDid you think that holiday celebrated on the 3rd Monday in February is "Presidents Day?" I assumed so given the prevalence of "Presidents Day." Well, it maybe so for some states, but the Office of Personnel Management's calendar still lists it as "Washington's Birthday." The White House put out a story about it on Monday. Better late than never.

How Douglas Engelbart Invented the Future

How Douglas Engelbart Invented the Future - RF CafeThis article on computer mouse inventor Douglas Engelbart appeared in the January 2018 issue of Smithsonian magazine. I like the opening paragraph by author Valarie Landau, who happened upon a 1968 film while researching for a documentary. "On December 8, 1968, Douglas Engelbart sat in front of a crowd of 1,000 in San Francisco, ready to introduce networked computing to the world. Engelbart was no Steve Jobs. He was a shy engineer with no marketing background. His goal was to speak directly to other engineers, showing them that they could use computers in new ways to solve complex ..."

Southwest Antennas Tri-Band Omni-Directional Antennas for L, S, C Band

Southwest Antennas Releases New Rugged Tri-Band Omni-Directional Antennas for L, S, and C Band Communication - RF CafeSouthwest Antennas, an industry leader in rugged RF / Microwave antenna and accessory products, has released a new line of tri-band antenna solutions designed to cover several popular sub-bands across the L, S, and C Bands. These omni-directional antennas are tuned for high performance operation in the following frequencies: 1.70 - 1.85, 2.2 - 2.5, and 4.4 - 5.0 GHz. For users who expect to utilize these bands or deploy multi-band radio systems, tri-band antennas can ...

Gowanda Intros Shielded Surface Mount RF Inductors w/Higher Inductance

Gowanda Electronics Intros Shielded Surface Mount RF Inductors with Higher Inductance - RF CafeGowanda Electronics, a designer and manufacturer of precision electronic components for radio frequency and power applications, announces the expansion of its SML32S series of wirewound, shielded, molded RF surface mount inductors in the "1210" style. This expansion increases the number of individual parts in the series by more than 20% and broadens the inductance range by adding values from 120 µH to 470 µH. The expansion was done in order to address the market need for higher inductance shielded inductors in RF applications ...

FCC Suggested Changes to CBRS Band Rules Could Hinder Progress

FCC Suggested Changes to CBRS Band Rules Could Hinder Progress - RF Cafe"The Dynamic Spectrum Alliance (DSA) has approached the Federal Communications Commission (FCC) regarding its discontent over the proposed changes in the CBRS band rules. According to the DSA, the changes to the Priority Access License (PAL) and other rules, first requested by petitioners and now proposed by the Commission, are both unnecessary and counterproductive to enabling the fullest use of the Citizens Broadband Radio Service (CBRS) band. In its NPRM, the FCC proposed changes which included increasing the length of license terms from three ..."


















KR Electronics Intros 968 MHz Surface Mount Highpass Filter

KR Electronics Intros 968 MHz Surface Mount Highpass Filter - RF CafeKR Electronics has released part number 3338+, which is a 968 MHz highpass filter. The filter is a selective elliptic type filter. The stopband starts at 885.5 MHz and the passband is maintained to >4 GHz. The filter is supplied in a miniature surface mount package measuring 0.20" x 0.30" x 0.18". Other frequencies and bandwidths are available ...

KP Debuts New 3 GHz Sector Antennas for WISP Applications

KP Debuts New 3 GHz Sector Antennas for WISP Applications - RF CafeKP Performance Antennas, a manufacturer of WISP antennas and accessories, announced today that it has released new high performance, 3 GHz sector antennas to its portfolio for use in WISP networks. KP's expanded line of 3 GHz sector antennas consists of four new models including the KP-3SX4-65 quad-port 18 dBi sector, the KP-3S3S-65SA which features two 3 GHz antennas in one radome, the KP-3DP65S-45 18 dBi Dual Polarized sector, and the KP-3DP120S-45 3 GHz sector which is specially designed for LTE applications ...

Pasternack Intros mm-Wave Removable End Launch Connectors

Pasternack Introduces a New Line of Millimeter-Wave Removable End Launch Connectors - RF CafePasternack, a leading provider of RF, microwave and millimeter wave products, has just released a new line of high-speed end launch connectors. These new removable end launch connectors are perfect for signal integrity measurements, coplanar waveguide, chip evaluations, SERDES, substrate characterization, 25 GbE and test fixture applications. Pasternack's new series of high-speed end launch connectors is comprised of four models that provide VSWR as low as 1.10:1 ...

Design and Simulate Phased Arrays with NI AWR Software

Application Example Demonstrates How to Design and Simulate Phased Arrays with NI AWR Software - RF CafePhased-array antennas are becoming popular for a variety of applications such as automotive driver assist systems, satellite communications and advanced radar and will be key components of upcoming 5G communications systems. This application example provides a brief overview of the simulation capabilities within NI AWR Design Environment, specifically Visual System Simulator™ (VSS), that address the complexity and cost issues involved in developing communications systems based ...

everythingRF Launches Photonics Resources Website

everythingRF Launches Photonics Resources Website - RF CafeGoPhotonics is an online product discovery platform for the Photonics sector. They list complete product catalogs of lasers, laser diodes and other photonics products from the leading manufacturers and make them searchable by specification. The parametric search tools on GoPhotonics have been developed for each category based the parameters that users would need to specify when looking for a product in the specific category. Laser Systems & Modules: We have over 10,000 Products listed from more than 200 manufacturers. Users can narrow down on lasers based ...

















FinFETs Shimmy to 5G's Frequencies

FinFETs Shimmy to 5G's Frequencies - RF Cafe"Engineers at Purdue University and GlobalFoundries have gotten today's most advanced transistors to vibrate at frequencies that could make 5G phones and other gadgets smaller and more energy efficient. The feat could also improve CPU clocks, make wearable radars, and one day form the basis of a new kind of computing. They presented their results today at the IEEE International Solid-States Circuits Conference, in San Francisco. 5G transceivers need two key components: oscillators and filters. Oscillators produce the frequency ..."

World's 1st Superatomic 2-D Semiconductor

World's 1st Superatomic 2-D Semiconductor - RF Cafe"Atoms are the basic building blocks of all matter - at least, that is the conventional picture. In a new study, researchers have fabricated the first superatomic 2-D semiconductor, a material whose basic units aren't atoms but superatoms - atomic clusters that exhibit some of the properties of one or more individual atoms. The researchers expect that the new material is just the first member of what will become a new family of 2-D semiconductors whose superatomic structures will greatly expand ..."

Bringing a Hidden Superconducting State to Light

Bringing a Hidden Superconducting State to Light - RF Cafe"A team of scientists has detected a hidden state of electronic order in a layered material containing lanthanum, barium, copper, and oxygen (LBCO). When cooled to a certain temperature and with certain concentrations of barium, LBCO is known to conduct electricity without resistance, but now there is evidence that a superconducting state actually occurs above this temperature too. It was just a matter of using the right tool - in this case, high-intensity pulses of infrared light - to be able to see it. Reported in a paper published ..."

Blimps Provide LTE Network Coverage in Hard-to-Reach Rural Areas

Blimps Provide LTE Network Coverage in Hard-to-Reach Rural Areas - RF Cafe"Boston-based startup Altaeros has demonstrated a new "SuperTower" to help operators deploy LTE in hard-to-reach rural communities using tethered aerostats i.e. the industrial versions of blimps. SuperTowers float at heights six to eight times higher than most cell towers and are a great way to reach hard to reach rural communities. They offer greater flexibility for site placement, cost up to 70 percent less to roll out, provide coverage equivalent to a network of 30 conventional cell towers and have less impact on the environment ..."

Non-Line-of-Sight Terahertz Communication Links are Possible

Non-Line-of-Sight Terahertz Communication Links are Possible - RF Cafe"Researchers at Brown University, have been working on a new study that shows terahertz data links are possible even without direct line-of-sight between transmitter and receiver, a promising finding for future ultra-high-capacity terahertz data networks. Today's cellular networks and Wi-Fi systems rely on microwave radiation to carry data, but the demand for more and more bandwidth is quickly becoming more than microwaves can handle. That has researchers thinking about transmitting data on higher-frequency terahertz waves, which have as much as 100 times ..."

Shannon's Limit, or Opportunity?

Shannon's Limit, or Opportunity? - RF Cafe"For several years now, the submarine network industry has benefitted from the arrival of coherent-based modems allowing cable operators to upgrade their submerged network assets to previously unthinkable total information-carrying capacities. Channel speeds initially increased from 10 Gb/s to 40 Gb/s, then to 100 Gb/s, and now even higher. Submarine cables deployed many years ago are now supporting an order of magnitude increase in total information-carrying capacity. The exact total capacity of an upgraded cable depends upon its unique ..."