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Anatech Electronics November 2021 Newsletter

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Anatech Electronics Header: November 2021 Newsletter


Sam Benzacar of Anatech Electronics, an RF and microwave filter company, has published his November 2021 newsletter that features his short op-ed entitled "C-band and Altimeters: Bad Company? ," where he notes that even though FCC concluded that the AVSI study "does not demonstrate that harmful interference would likely result under reasonable scenarios," there is enough concern in the non-standardized radar altimeter realm to raise a red flag. As Sam points out, there is a full 500 MHz separation between the C-band wireless band and radar altimeters. Sam also presents some relevant industry news items as well, including Amazon planning to launch Kuiper satellite prototypes, and the DoD funding research that combines 5G and optical sensors.

A Word from Sam Benzacar

C-band and Altimeters: Bad Company?

Anatech Electronics November 2021 Newsletter (Sam Benzacar) - RF CafeBy Sam Benzacar

As 5G networks add to their mid-band spectrum portfolio, it was only a matter of time before interference issues would arise, and one of the latest is interference to the radio altimeters used during landing in all types of aircraft. In both the U.S. and Canada, objections have been raised by airlines and their respective governments about operation at C-band frequencies between 3.7 and 3.7 GHz, which is close to the 4.2 to 4.4-GHz at which altimeters operate in the US.

On the face of it, the 500-MHz separation between these bands should pose no interference potential as bandpass filters with high levels of rejection could eliminate any spurious emissions. However, airlines, aircraft manufacturers, the FAA, and Canada's Department of Innovation, Science, and Economic Development (ISED) aren't so sure.

What's remarkable is that while the wireless industry has extraordinarily comprehensive specifications regarding system performance for 5G, the same can't be said for radio altimeters for which there is no internationally recognized standard. As a result, a study conducted by the Aerospace Vehicle Systems Institute (AVSI) showed that there could be a wide variation in radio altimeter performance amount various manufacturers. What this conclusion is referring to is that some altimeters may not have adequate receiver filtering.

However, the FCC concluded that the AVSI study "does not demonstrate that harmful interference would likely result under reasonable scenarios" or even "reasonably foreseeable scenarios." To support this conclusion, T-Mobile cited a study conducted by the engineering firm Alion that concluded that the assumptions in the AVSI study were extreme, and thus resulted in extreme conclusions. With tens of thousands of commercial and general aviation aircraft in service throughout the world, the ramifications of this situation cannot be overstated. And while it's true that wireless broadband networks have been operating at 3.7 to 4.2 GHz in the US and other countries for years, there have been no reports of problems.

But the use of C-band frequencies will dramatically increase activity, so it's too soon to assume they won't cause interference. That solution, as proposed by the FCC in a Special Airworthiness Information Bulletin issued on November 2, is for radio altimeter manufacturers, aircraft manufacturers, and operators to voluntarily provide information to federal authorities related to altimeter design and functionality and that they test and assess their equipment. Unfortunately, the C-band allocations in the US are set to take effect on December 5, which leaves virtually no time to come up with a solution. That solution would arguably take an extremely long time, as ideally, altimeters in every aircraft should be tested. In the meantime, the flying community will be test bed.

Anatech Electronics has been providing standard and custom RF and microwave filters and other filter-based components to solve interference problems for utilities, oil and gas companies, and organization with similar requirements for more than 30 years, and we can solve yours as well. So, reach out to us with your most challenging problems at (973) 442-7272 or visit our website at anatechelectronics.com.

WeLink Rolls out 60-GHz Gigabit Fixed Wireless - RF CafeWeLink Rolls out 60-GHz Gigabit Fixed Wireless

WeLink, a service provider founded in 2018, has rolled out fixed wireless service offering symmetrical speeds up to a gigabit per second in metro Las Vegas and Phoenix. The company will use 60-GHz wireless technology that it developed, which will be used for both fronthaul and backhaul. The access equipment uses a mesh approach in which one customer's equipment can act as a repeater for another customer to extend range. The company plans to charge $70 a month for gigabit service for 24 months or $80 a month without a time commitment.

DoD Funds Research That Combines 5G and Optical Sensors - RF CafeDoD Funds Research That Combines 5G and Optical Sensors

The Air Force and the Department of Defense are exploring the use of 5G as a surveillance imaging sensor through a $297,000 grant from the Air Force and $295,000 from DoD to associate professors Yu Chen and Xiaohua Li at Binghamton University's Thomas J. Watson College of Engineering and Applied Science. A 5G network would form a millimeter-wave camera similar to an infrared time-of-flight camera. Network security would be maintained what the researchers call Environmental Fingerprint-based Consensus Blockchain (ENFChain) to authenticate data sources, bookmark data transactions, and encrypt the data. The goal is to achieve full-spectrum surveillance that works in all weather conditions. This would make it possible to let troops in urban areas see enemy combatants around corners or in dark spaces that would otherwise be obscured.

Verus Research Gets DARPA High-Power Microwave Pact - RF CafeVerus Research Gets DARPA High-Power Microwave Pact

New Mexico-based Verus Research has been awarded a 48-month $5 million contract in DARPA's Waveform Agile RF Directed Energy (WARDEN) program to develop hardware, theory, and computational models to extend the range and effectiveness of high-power microwave (HPM) systems. The effort focuses on electromagnetic interactions with electronics contained within enclosures and the effects on system operation. The effort will help guide the development of new HPM systems, extending their range and effectiveness, and providing new HPM employment approaches for DoD.

Amazon to Launch Kuiper Satellite Prototypes - RF CafeAmazon to Launch Kuiper Satellite Prototypes

Amazon plans to launch its first two prototype satellites for the Project Kuiper constellation in the fourth quarter of 2022 after signing a multi-launch agreement with ABL Space Systems that is developing the launch vehicle. Amazon's KuiperSat-1 and KuiperSat-2 will demonstrate the technology the company plans to deploy in a complete constellation. It includes phased-array and parabolic antennas, power and propulsion systems, and custom modems. The prototype Ka-band satellites will be deployed at 590 km from Earth and will be launched consecutively on two launch vehicles. The satellites will be equipped with sunshades to avoid conflicting with radio telescopes, an approach also used by SpaceX.

Getting Ready for 5G:

Anatech Electronics introduce New Ka band 30.5 GHz Waveguide Band Pass Filter. Featuring a center frequency of 30.5 GHz, a bandwidth of 1000 MHz, an Insertion Loss 1 dB Max, and a Power Handling is 20 watts.

Ka band 30.5GHz Waveguide Band Pass Filter - RF Cafe

Anatech Electronics Introduces a New Line of Suspended Stripline and Waveguide Type RF Filters

Anatech Electronics Waveguide Filters - RF Cafe

LINKS: Waveguide Bandstop & Waveguide Bandpass 

Anatech Electronics Suspended Stripline Filters - RF Cafe

LINKS:  Suspended Stripline Highpass  & Suspended Stripline Lowpass

Check out Our Filter Products

Anatech Electronics Cavity Band Pass Filters       Anatech Electronics LC Bandpass Filters - RF Cafe       Anatech Electronics Cavity Bandpass/Notch Filters - RF Cafe

    Cavity Band Pass Filters             LC 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 www.anatechelectronics.com.


Anatech Electronics, Inc.

70 Outwater Lane

Garfield, NJ 07026

(973) 772-4242




Posted September 29, 2021

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