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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February 2013

“Rise of the Drones”

Every now and then, NOVA produces a show that grabs my attention but last month’s “Rise of the Drone” really caught my eye. Basically a history of drones, drone technology and future developments, with a smidgen devoted to ethical issues, it’s a fascinating hour. We meet Dr. Vijay Kumar, a University of Pennsylvania scientist who is working towards the future of drones — autonomous drones — by developing more sophisticated sensors; aeronautics specialist Abe Karem, known as the “father of the Predator;” and the engineer who really captivated me, Yiannis Antoniadis of BAE Systems.

According to the program, aerial robots are replacing manned aircraft and revolutionizing warfare, allowing one to see/kill targets from half a world away. While the U.S. currently has more than 2300 manned fighter planes, drones, aerial robots that carry visual sensors, navigation systems and, sometimes, weapons, are gradually replacing them. The Pentagon has a family of more than 10,000 drones, usually for spying purposes but also to strike and kill. The military uses drones to support troops on the ground, while the CIA maintains a covert drone program to find and target HVIs (high value individuals).

The Francis Gary Powers incident in Russia in 1960, in which he was captured after bailing out of his U-2 spy craft and imprisoned for nearly two years, was one of the catalysts towards developing unmanned aircraft, and Abe Karem was one of the main players. He started working on drones in the 1970s and realized that their relative efficiency and lightness allowed the creation of affordable, high endurance UAVs (Unmanned Aerial Vehicles), and thus the Albatross was born, evolving into the Amber, which later became the Predator. DARPA gave Karem seed money and made development of UAVs possible.

After 9/11, UAVs were armed and used to kill enemy combatants, transitioning from purely spying purposes.

Most fascinating was a segment on Antoniadis, the engineer who designed ARGUS, a sensor with 1.8 gigapixels, the world’s highest resolution camera. It is equivalent to up to 100 Predators looking at an area the size of a medium-size city at once. The government allowed Antoniadis to speak about ARGUS in fairly general terms, but would not reveal whether or not it is currently used in the field.

There was, of course, much more to this program, and I urge you to buy a copy or find it online at It’s that good.


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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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