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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January 2013

Bright Future for International TWTA Market
By Steve Walley, Vice President of Business Development, dB Control

Fred Ortiz, President, dB Control

With the ability to provide high power over wide bandwidths, and a reputation for withstanding harsh environmental conditions, traveling wave tube amplifiers (TWTAs) will continue to be in demand worldwide — both for defense and commercial applications. As these applications increase in sophistication there will be a need for even more bandwidth, which in turn requires the development of TWTAs that operate at higher frequencies, such as K-band (18-26.5 GHz), Ka-band (26.5-40 GHz), Q-band (33-50 GHz) and V-band (50-75 GHz). Wider channel bandwidth translates into higher data throughput — a feature always in demand for defense applications.

The satellite communication systems market continues to grow as the demand for data, video and internet over satellite increases. Both commercial and military users are looking for more bandwidth and moving to Ka-band (27.5 to 31.0 GHz). Due to rain attenuation at Ka-band, more TWTA linear power output is required — and new TWTA development has addressed this requirement. The Radar Systems market continues to grow as new threats are encountered. The trend is for TWTAs with higher peak power output, and higher duty cycles to work in the system to help determine the range, altitude, direction and speed of incoming threats. New TWTAs with higher efficiency, smaller size and lighter weight are being developed. This continues to be a good market for TWTAS for ground, ship, and airborne radar systems.

Unmanned aerial vehicles (UAVs) present another great opportunity for TWTA manufacturers — both in the U.S. and overseas – because drones provide an unmatched level of situational awareness. There are currently 50 military organizations around the world using unmanned systems. IHS Industry Research & Analysis forecasts $81.3 billion will be spent in worldwide UAV business from 2012 to 2021.1 Here in the U.S., DoD officials plan to spend at least $5.78 billion on UAV technologies in fiscal year 2013.2 In terms of revenues, a Market Research Media report indicates that the U.S. military UAV market alone will reach $86.5 billion by 2018. The report notes that “UAV technology is the answer for both a smaller Defense Department heavily reliant on solid intelligence gathering, and for an increasingly militarized CIA overseeing the counterinsurgency drone strikes in Afghanistan, Pakistan and now Libya.

Next-Gen Opportunities Emerge Full Speed Ahead
While defense budgets have been reduced in the U.S. and Western Europe, IHS predicts that there will be no such cuts in China, Russia, Southeast Asia, Australia and India. Additionally, the tentative social/political environment in the Middle East and Latin America creates a need for more ISR (intelligence, reconnaissance and surveillance), possibly performed by UAVs. Of course, U.S. manufacturers must always be mindful of the potential for technology to be shared with an enemy. The Obama Administration will continue to reform export requirements for defense technology, especially for dual-use and/or ubiquitous products. Internationally, the Missile Technology Control Regime affects which medium and large UAVs can be sold to overseas markets. This restrictive, multi-lateral agreement spans 34 countries that have arranged not to share ballistic missile knowledge and components.

There is no doubt that defense contractors, military organizations and commercial companies will continue to seek competitively priced TWTAs that are smaller, lighter, and more efficient and reliable. To meet these requirements, dB Control continues to work with our TWT suppliers to improve the overall efficiency and reliability of the TWTs used in our amplifiers. As the efficiency of the tube is enhanced, the power required from the power supply is less — thus enabling it to shrink in size. A smaller power supply and more efficient tube results in less thermal dissipation, so a lighter weight heat-sink and/or fan can be used. This reduces the overall size and weight of the TWTA, and results in better reliability. As the TWTA market expands, designers and manufacturers must be equipped to meet these stringent — and often differing — requirements of both international and domestic users.

dB Control
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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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