The Opportunities and Challenges of LTE Unlicensed in 5 GHz
David Witkowski, Executive Director, Wireless Communications Initiative
In 1998, the Federal Communications Commission established the Unlicensed National Information Infrastructure or U-NII 5 GHz bands. These are used primarily for Wi-Fi networks in homes, offices, hotels, airports, and other public spaces and also consumer devices. U-NII is also used by wireless Internet Service Providers, linking public safety radio sites, and for monitoring and critical infrastructure such as gas/oil pipelines.

Uncertain Times for DefenseWill OpenRFM Shake Up the Microwave Industry?
By Barry Manz

Throughout the history of the RF and microwave industry there has never been a form factor standardizing the electromechanical, software, control plane, and thermal interfaces used by integrated microwave assemblies (IMAs) employed in defense systems. Rather, every system has been built to meet the requirements of a specific system, which may be but probably isn’t compatible with any other system. It’s simply the way the industry has always responded to requests from subcontractors that in turn must meet the physical, electrical, and RF requirements of prime contractors. Read More...


Band Reject Filter Series
Higher frequency band reject (notch) filters are designed to operate over the frequency range of .01 to 28 GHz. These filters are characterized by having the reverse properties of band pass filters and are offered in multiple topologies. Available in compact sizes.
RLC Electronics

SP6T RF Switch
JSW6-33DR+ is a medium power reflective SP6T RF switch, with reflective short on output ports in the off condition. Made using Silicon-on-Insulator process, it has very high IP3, a built-in CMOS driver and negative voltage generator.

Group Delay Equalized Bandpass Filter
Part number 2903 is a group delayed equalized elliptic type bandpass filter that has a typical 1 dB bandwidth of 94 MHz and a typical 60 dB bandwidth of 171 MHz. Insertion loss is <2 dB and group delay variation from 110 to 170 MHz is <3nsec.
KR Electronics

Absorptive Low Pass Filter
Model AF9350 is a UHF, low pass filter that covers the 10 to 500 MHz band and has an average power rating of 400W CW. It incurs a rejection of 45 dB minimum at the 750 to 3000 MHz band, and power rating of 25W CW from 501 to 5000 MHz.

LTE Band 14 Ceramic Duplexer
This high performance LTE ceramic duplexer was designed and built for use in public safety communication and commercial cellular applications. It operates in Band 14 and offers low insertion loss and high isolation to enable clear communications in the LTE network.
Networks International

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The Elephant in the Room
By Barry Manz

Let’s hear it for the federal government. With its now standard blaming, waffling, cowering, and blind obedience to ideology, the Obama administration and Congress let $85 billion in immediate cuts and hundreds of billions more over a decade take effect. A conclusion to this sorry era in our nation’s history is far from over, as the real work now begins: wrangling over the new federal budget, the true long-term effects of sequestration will be, and a lot more. However one thing is certain: The defense industry, including those like the microwave industry that rely on it, will take a beating.

Nobody doubts there is more fat in Pentagon budgets than cheap bacon, and they cannot be leaned out to the degree now required by law without goring the country’s security, reducing its technology base, or further delaying vital programs. Unfortunately, DoD hasn’t done itself any favors in its handling of the F-35 Joint Strike Fighter program, the ever-hungry elephant in the room. DoD is staking the future of U.S. fighter aircraft on the F-35, as it is the only stealth fighter in production and will replace thousands of A-10, F-15, F-16, and F-18 fighters for the Air Force, Navy, and Marines Corps.

As the F-35 embodies massive technical feats it shouldn’t be surprising that making all of these first-of-their-kind systems work has cost more and taken longer than expected. Nevertheless, decision to build aircraft before being “fully cooked” was ill-conceived and will cost far more in retrofits than if the problems were solved during development. That would have delayed the program, adding to the growing tsunami of criticism. Creating three variants of the aircraft, one of which like the Harrier is devilishly complex, was also an “all or nothing” crap shoot. And on and on.

The F-35 program will continue, it will incur additional expense, more delays will be announced, and perhaps fewer aircraft will be built. The RF and microwave industry needs the F-35 and the cash that its EW, radar, communications, and avionics systems will bring. But it also needs the many other programs that are being jeopardized by this massive program.

Barry Manz is a contributing editor to Microwave Product Digesting can be reached at



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MMD March 2014

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The Design of Ultra Narrowband Amplifiers Using Small-Signal Varactor Upconverters
This paper presents a method of realizing tunable microwave amplifiers with ultra narrow bandwidths that can be less than 0.5% by the use of a varactor up-converter (UC).
Planar Monolithics

Directivity and VSWR Measurements
Return loss and VSWR measurements are complicated by the finite performance of the directional device used to measure the reflected power. The only accurate and convenient way to make return loss measurements is with a well matched high directivity directional coupler or bridge.
Marki Microwave

Switch Solutions for Systems with Low PIM Requirements
Dow-Key Microwave has invested in R&D for new RF switch products designed specifically to reduce intermodulation (IM) in coaxial switches.
Dow-Key Microwave

How to Specify RF and Microwave Filters
Covers cavity, ceramic, LC, crystal and helical filters.
Anatech Electronics

Mounting Considerations for Medium Power Surface-Mount RF Devices
Covers all factors that must be considered when mounting SMT devices.
TriQuint Semiconductor

Biasing MMIC Amplifiers
How to bias MMICs along with theory and techniques.

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