IN MY OPINION

Interconnect Advances Fuel Technology Growth
By Orwill Hawkins, Vice President of Marketing, LadyBug Technologies

With increased frequencies, higher data rates, and lower noise levels, the microwave industry serves as a leader in technological capability. Demand for quality interconnects has increased right along with other higher-performance areas in the industry.
Read More...

MILITARY MICROWAVE DIGEST


MMD March 2014
New Military Microwave Digest

ON THE MARKET


E-Band Active X5 Multiplier
Model SFA-743843516-12SF-N1 is an E-band X5 active multiplier with center frequency at 79 GHz with minimum +/-5 GHz operational bandwidth. It converts 14.8 to 16.8 GHz/+5 dBm input signal to deliver 74 to 84 GHz frequency band with more than +16 dBm power.
Sage Millimeter

Hand-Flex™ Coaxial Cable
Covering DC to 12.5 GHz, this 8” coaxial cable, 141-8SMNB+, has a bulkhead Female Type-N connector at one end and SMA-Male at the other. Features include low loss, excellent return loss, hand formable, and an 8mm bend radius for tight installations.
Mini-Circuits

Phase Trimmer Series
This new phase trimmer series is designed for RF applications where phase match between two cables is needed for proper system performance. Phase trimmers, offered from DC to 50 GHz, will give an accurate phase adjustment over a specified frequency range.
RLC Electronics

Planar Monolithics Industries
Model PTRAN-100M18G-SFB-3UVPX-MAH is a transceiver covering the frequency range of 100 MHz to 18 GHz. The transceiver fits into a 3U Open VPX form factor utilizing the high speed VITA 67 RF connector.
Planar Monolithics Industries

SMT High-Power Attenuators
Now available with full design support capabilities are three new SMT high-power attenuators from Anaren. These 30 to 50W devices are high-performance, high-power chip attenuators covering DC to 3.0 GHz and feature high return loss and small footprints.
Richardson RFPD

See all products in this issue


 

June 2013

Interference in the Second Wireless Revolution

By Sam Benzacar, President, Anatech Electronics

Fred Ortiz, President, dB Control

In the late 1980s as the microwave industry faced a dramatically reduced U.S. defense budget (from which most of its revenue came from), something remarkable happened: The aptly-named Wireless Revolution appeared seemingly overnight, creating an entirely new revenue source for our industry. Three decades later, we also have a declining defense budget and the emergence of the Second Wireless Revolution, delivered by high-speed data transmission and advances in every technology used to build infrastructure and wireless-enabled devices. This revolution is just beginning and there is no end in sight, as LTE Advanced is on the horizon and distributed antenna systems and small cells are creating a market within a market that never existed before.

However, there’s a fly in the ointment this time around: significant interference issues that affect everyone from component to subsystem manufacturers as well as wireless carriers that was far less onerous in Wireless Rev. 1. Having consumed large amounts of spectrum through the first-through-fourth generations of wireless evolution, frequencies below 3 GHz are jam-packed with signals. This level of spectral density is placing huge burdens on transmit and receive chains to keep signals “clean” with amplifier designers no doubt feeling the pinch more than others. Squeezing new services into a finite spectrum with minimal guard bands makes interference inevitable, a problem that has been and will continue to be solved by filters, both inside user equipment and inside and outside base stations.

As a filter manufacturer, we’re (happily) on the receiving end of requests for extreme in-band signal rejection, extremely low passive intermodulation distortion and insertion loss, and other requirements that bump up against what physics makes it possible to achieve. For distributed antenna systems (DAS), small cells, and Wi-Fi hot spots, interference is looming ahead as a potentially enormous issue. DAS and small cells must work together with their macro cell counterparts in the same place at the same time. In a stadium, example, a DAS may have dozens of nodes all within a relatively small area. Wi-Fi hotspots have always been required to function together with Bluetooth, but there are more hotspots popping up every day as cable companies provide them as a “value-added” customer feature and wireless carriers use them for backhaul. In addition, small cells – basically any base station other than a macro cell – will face the same interference issues as they are widely deployed.

Contrary to what many in the industry believe, cavity, LC, ceramic, and crystal filter technology has not remained stagnant. The laws of physics obviously place limits on what a filter (or any other RF or microwave component) can achieve, but through the use of both tried-and-true filter design and manufacturing techniques along with greater manufacturing precision and prudent use of today’s 3D design software and filter synthesis tools, the levels of performance that filters can achieve can be extended to accommodate what all sectors of the wireless industry are most assuredly going to need in the years ahead.

That’s good news for everyone, because interference isn’t going to become less an issue in the future and it must be effectively mitigated for wireless networks to work “harmoniously” together with the inevitability of vanishing guard bands and new services shoehorned between existing services.

Anatech Electronics
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FROM WHERE WE SIT

Uncertain Times for DefenseIn Defense of DARPA; Lamenting Bell Labs
By Barry Manz

A federal agency like DARPA is a sitting duck for politicians and assorted other critics. It has come up with some truly bizarre programs over years that ultimately either delivered no tangible results, were canceled before they could cause any damage, or attempted to answer questions that nobody was asking or needed answers to. Read More...


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