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.

MMD March 2014

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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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June 2014

It’s A GaN, GaN, GaN, GaN World!

The buzzwords of this month’s IMS2014 show were GaN (gallium nitride), 5G, the next generation of wireless, and the “Internet of Things” (IoT). To loosely paraphrase Mark Twain, “The rumors of the death of GaAs have been greatly exaggerated.” While GaN is certainly the hot III-V material these days, several device manufacturers at the show (some of whom are wedded to GaN) agreed that GaAs is not going to disappear soon – “there’s room enough for everybody” – but check back in eight years and see where it stands then.

Eventual migration from 4G to 5G will not be without its share of problems, as it will require new spectrum at higher frequencies and wider channel bandwidths. But these issues will be solved and 5G will emerge as an incredibly fast, efficient, migration beyond LTE-Advanced that will keep up with our insatiable need to stream HD video. In fact, it might even become an alternate to cable and fiber for delivering voice, data, and TV services to the home.

Then there’s the IoT, in which every conceivable person, place or thing is connected wirelessly via Internet Protocol Version 6 (IPv6). We’ve heard about the inevitability of this for years but now it’s finally happening. All told, there won’t be a shortage of “good RF and microwave design challenges” any time soon.


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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...

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