Hear Ye, Hear Ye
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but page format is my copyright - do not distribute it.
Electronics, a manufacturer of RF and microwave filters, has published its March newsletter.
As always, it includes both company news and some tidbits about relevant industry happenings. In it,
Sam Benzacar discusses, among other topics, spectrum sharing, including the ISM bands and a DARPA
program called Shared Spectrum Access for Radar and Communications (SSPARC) that has the goal of
developing more advanced sharing technology so that radars and military and commercial
communications systems can cooperate in near real time. Anatech's business is to make certain
that system and circuit designers have capable filters available to assure successful implementation.
A Word from Sam Benzacar
By Sam Benzacar
When it comes to spectrum, no one likes to share, but as we can't make any more of it, that's one
of the very few alternatives. Generally, two services share the same frequencies and one has priority
over the other. When the second-tier service detects activity on the same or sometimes an adjacent channel,
it must move elsewhere. While this sounds like a great way to encourage frequency reuse, it has been
widely debated for years as various companies complained that it would be too complex, impossible to
enforce, or cause other headaches. But one fact is a near certainty: there will be interference.
Spectrum sharing isn't a new concept, as it's used by various services in the crowded ISM band at
2450 MHz and is a mandatory requirement for using the "TV white spaces" opened up after over-the-air
TV broadcasting transitioned from analog to digital transmission techniques. It's also part of the national
public safety broadband network, for which there should soon be a contract award.
The Department of Defense saw this coming years ago and is taking steps to make sure "intruders"
don't interfere with its radars through various initiatives. One of is a DARPA program called Shared
Spectrum Access for Radar and Communications (SSPARC) that has the goal of developing more advanced
sharing technology so that radars and military and commercial communications systems can cooperate in
near real time. There are others as well.
Over time, these initiatives should make spectrum sharing must less likely to cause interference.
In the meantime, it seems inevitable that sharing frequencies will cause interference problems for both
the primary and secondary services. One of the reasons is that unless communications are able, as DARPA
proposes, to react almost instantaneously there will be times when both are transmitting (and attempting
to receive) at the same time. I may be overly pessimistic on this subject but three decades in the filter
business has taught me that interference has a way of defeating the best efforts of approaches in which
multiple systems operate close together. I hope I'm wrong, but….
If you're designing any type of communication system that operates close to other services with narrow
(or no) guard bands, are working to build a new system destined to operate in a shared environment,
or are having interference problems with a fielded system, please give Anatech Electronics a call. We've
been solving interference problems with high-performance RF and microwave filters since 1990. You can
reach us at (973) 772-4242 or by email at
DoD Explores Human
Cell RF Interaction
DARPA wants to know more about how human cells use electromagnetic radiation to talk to each other,
and is investigating it in a program called RadioBio. The goal is to determine if cells can exchange
information with EM signals, what the cells are communicating, and how they achieve it. The program
will attempt to learn how natural "antennas" are capable of generating and receiving information in
a noisy, cluttered EM environment," at frequencies from kHz to THz.
Mesh Network for Weather Alerts Needs No Internet Access
Scientists are building networking technology to provide people weather alerts even if they don't
have internet connectivity. Developed by IBM Research and The Weather Company, Mesh Network Alerts is
a peer-to-peer mesh networking technology that allows Android devices to communicate with each other
without the need for Wi-Fi or cellular connectivity. It will first be deployed in India before expanding
to Africa, Asia, and Latin America where networks are congested and connectivity is limited. The accompanying
smartphone app requires only 3.2 Mbyte/s of storage and can store weather data offline for up to 24
Plays Well in Space
Belgian chip research consortium Imec and satellite payload developer Thales Alenia Space have demonstrated
that Imec's GaN-on-Si power devices based can withstand heavy ion and neutron irradiation with no degradation
in performance, making them well suited for spaceflight applications. Imec irradiated its GaN power
devices with heavy ions of xenon and neutrons that are the primary cause of failed electronic circuits
IAI Develops Forest-Penetrating
Israel Aerospace Industries (IAI) has developed a radar that can identify targets traveling through
heavily wooded areas. The ELM-2112FP persistent surveillance foliage penetration radar is being marketed
as a border security solution. The radar's forest-penetrating abilities rely on the ability of FMCW
modulation to track people and vehicles in congested areas even without a clear line-of-sight.
Check out Our Filter Products
Cavity Band Pass Filters
Band Pass Filters Cavity Bandstop/Notch Filter
About Anatech Electronics
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
Anatech Electronics, Inc.
70 Outwater Lane
Garfield, NJ 07026
Posted March 22, 2017