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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Microwave Product Digest readers are RF and microwave design, R&D, and applications engineers, and engineering managers. They are always in need of good technical information that can help them in their work. There are several types of articles that fulfill these requirements:

Tutorial articles: Basic (or not so basic) technical information about technologies and product types. 1500 to 3500 words

Design articles: “How to do it” articles that provide specific information about how to design specific circuits or utilize emerging or other advanced technologies. 1500 to 3000 words

Product features: Introduce a new product or product family, providing significant details about the product, its specification, and user benefits. 1500 to 3000 words

In My Opinion: A monthly editorial column that expresses the opinion of a high-level person or his or her company on a topic that is of interest to members of the RF and microwave community. 450 to 1000 words


The editor, Karen Hoppe, must be notified and the topic explained either verbally or as an abstract. Karen can be reached at (201) 569-5870 or by email at


After acceptance by the editor, manuscripts and artwork should be delivered via e-mail no later than two months from the issue date (e.g., January 1 for March issue)


Text: Microsoft Word format

Artwork: Image files must be in color 300 dpi in .bmp, ,gif, tif, or .jpg formats and be high quality. This also apples to line drawings (although they need not be in color), which must be in their final form


Article must be accompanied by the author or authors names, phone numbers, e-mail address, title, company affiliation, and company address

MPD will supply a PDF proof of the article prior to publication for review and possible revisions. These proofs must be returned to MPD within 5 working days from submission. A confirming e-mail must be send to the editor indicating that all changes once incorporated by MPD are acceptable and the article is suitable for publication.


Karen Hoppe





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Uncertain Times for DefenseOpen’s Systems and Changes in DoD Procurement: This Time It’s Real
By Barry Manz

The U.S. Department of Defense has a well-earned reputation for inertia. Many proposals for change are made – but nothing happens. The COTS initiative, which promised cost savings through the use of off-the-shelf commercial parts, sounded terrific at the time. It heralded a major departure from standard DoD procurement that more or less guaranteed that every system would be different in part because it used parts that were developed from scratch, leading to “one-off” systems that were very expensive. Read More...

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