1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
Anatech Electronics, a manufacturer of RF and microwave filters, has published its January 2015 newsletter. As always, it includes both company news and some tidbits about relevant industry happenings. This month, Sam Benzacar reports on news about LTE Direct, GaN-on-diamond substrates for high power devices, the World Health Organization (WHO) findings on RF exposure levels' effects on kids' health, and microwaveable food packet technology. He also opines on the topic of "Interference and the New Year." Being a major manufacturer of filters, Anatech Electronics has a vested interest in such things.
Not "Connected" Enough: Here Comes LTE Direct
LTE Direct, developed by Qualcomm, is one of the new features emerging within the standard that lets your smartphone communicate with others nearby without going through the carrier's network. It can automatically discover nearby people, businesses, and other places, has a range of about 1500 ft., and uses little power so reduced battery life isn't likely to be an issue. Facebook and Yahoo love it as it offers yet another way to connect us with other people as well as businesses that could of course can be used to promote themselves to someone within reach.
Apple and partner retailers like Macy's have already dabbled in this with the Bluetooth-based iBeacon and Yahoo is building apps to create virtual tour guides. Tell the Yahoo app how much time you've got and it will suggest a route that takes you past "points of interest." LTE Direct-capable devices are likely emerge late this year.
Gallium nitride has achieved in less than a decade the status of DoD's Manufacturing Readiness Level 8 (MRL 8), one level lower than ready for full production. One of the big remaining issues is dissipating all the heat that GaN's high power density delivers along with RF power. The most promising candidate is replacing silicon carbide (SiC) substrates with industrial diamond, which sounds like fantasy but has already demonstrated its ability in a DARPA program, tripling thermal performance over SiC. Diamond has the highest thermal conductivity of any material on Earth, so making this technology producible could strip away the barriers to achieving GaN's full potential. Watch this space.
RF Worse for Kids Than Adults?
A report from the World Health Organization's International Agency for Research suggests that we should limit children's exposure to RF energy because they absorb it more easily than adults. Some of their other conclusions are that fetuses absorb it even more readily so pregnant women should avoid exposing their fetus to microwave radiation, adolescent girls and women should not place cellphones in their bras, current exposure limits are inadequate and should be revised, and toys that are wireless enabled should be monitored more closely or possibly banned. Of course, few people will pay any attention to these findings as they haven't heeded previous warnings, RF energy is essentially unavoidable, and no one seems to be keeling over from exposure to it.
Microwaveable food packaging: $14 billion by 2020?
Believe it or not, the microwave packaging industry– that is, the containers in which microwavable foods are housed--will reach $14 billion in sales by 2020, according to a report from Global Industry Analysts. The report predicts that microwave packaging solutions will in the future use sensors, fuzzy logic, digital displays, and automatic features to improve the "microwave cooking experience". They will be built to intelligently communicate to the consumer when to stir, uncover, add salt, etc.
Want a Stellar Job? Try Seattle
Space X, the commercial launch company founded by Paypal founder and Tesla Motors owner Elon Musk, is looking for people with experience in avionics and hardware design as well as antenna engineers, a microwave engineer, and a system network architect, all to be based in Seattle. In fact, Seattle is becoming a boom town for space-qualified engineering talent, thanks to Boeing (which is actually moving 1,000 people to facilities in North Carolina), Amazon's founder Jeff Bezos' Blue Origin, Microsoft co-founder Paul Allen's Stratolaunch Systems, Planetary Resources, Aerojet Rocketdyne, and others.
Interference and the New Year
By Sam Benzacar
Well here we are in 2015, which like last year promises to be a year of change within the microwave industry. There will be new services emanating from LTE, movement in First Net's challenge to build out an LTE-based nationwide public safety broadband network, more hand-wringing over the shrinking defense budget, and lots more. While I'm not clairvoyant, I'm safe in projecting that one thing won't change, and that's interference. Or at least there won't be any less of it.
The reason is pretty simple: Wireless services are crammed closer together as well as alongside other services, new frequencies above about 2.3 GHz are being more fully utilized for wireless services, the so-called Internet of Things will begin to connect every available person, place, or thing to the Internet usually without wires -- and this is just the short list.
All of this connectivity is wonderful but it's not "free" as interference has to be addressed, ideally as early as possible in the design stage but all-too-typically afterward. No matter how many smart antennas, beamforming networks, and signal processing tools are applied to the problem, RF interference will find a way to spoil the day.
As I've said times in this column, RF and microwave filters are the universal solution for solving interference problems in the design process when they can be predicted and compensated for, or in existing systems when they suddenly appear as a new service, base station, or other emitter goes "live" that wasn't there before.
Anatech Electronics has been helping designers create interference-free products and commercial and military engineers and technicians solve issues in deployed systems for nearly 25 years. So at the first mention of interference, call us first because we've based our reputation on helping people keep interference in check.
Check out some of our general product lines!
AEI lumped-element (LC) band pass ﬁlters range in frequency from 10 kHz to 2500 MHz, and are based on LC tank circuits consisting of parallel or series inductors and capacitors. They are relatively small and are optimized to achieve peak performance within a given set of speciﬁcations and mechanical requirements.
Anatech Electronics lumped element (LC) low pass ﬁlters exhibit high performance resulting in low insertion loss and high selectivity. Standard designs have a 0.05-dB Chebyshev response, Butterworth, elliptic, minimum delay response types. Anatech Electronics RF low pass ﬁlters range in length from 0.5 in. to more than 15 in, or more depending on the operating frequency, power handling, insertion loss, and other electrical requirements.
Our New Web Site Really IS Better!
A wholesale change to a company Web site is a momentous occasion and not just for the obvious reason that it probably looks nicer. It's because Web site design is difficult and time-consuming, and when the process is done you can relax – until the first problem crops up. There is nor has there ever been a perfect Web site.
To make a Web site "better" you first have to admit that the previous one had shortcomings, and then to not only solve those problems but make the site easier to use, while retaining the good parts At the beginning of last year, we embarked on a plan to create a new site for Anatech Electronics that while no doubt imperfect is VERY much improved over our previous one.
It's now much easier to find the products you want in fewer steps, to provide information to get a quote, and to select products by their application or key specifications, for example. We're happy with the result, and we hope you will be too. So please take a few moments and visit www.anatechelectronics.com. I think you'll find it worth your time.
Anatech Electronics, Inc. (AEI) specializes in the design and manufacture of standard and custom RF and microwave filters and other passive components and subsystems employed in commercial, industrial, and aerospace and applications. Products are available from an operating frequency range of 10 kHz to 30 GHz and include cavity, ceramic, crystal, LC, and surface acoustic wave (SAW), as well as power combiners/dividers, duplexers and diplexers, directional couplers, terminations, attenuators, circulators, EMI filters, and lightning arrestors. The company's custom products and capabilities are available at www.anatechelectronics.com and standard products are available for purchase at the Anatech Electronics integrated Web store https://www.anatechelectronics.com/index.php/webstore
Anatech Electronics, Inc.
70 Outwater Lane
Garfield, NJ 07026
Posted January 26, 2015