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

Green UHF-TV Transmitters
By Mark Murphy, Marketing Director, RF Power, NXP Semiconductors

Fred Ortiz, President, dB Control

As digital television rolls out across the world replacing older analog systems, the pressure that manufacturers of broadcast equipment are under to deliver richer content is driving the need for higher efficiency transmitters that utilize the maximum power available and are as cost-effective as possible. At the same time TV network operators are being forced to look for ways to reduce the amount of electricity used to power their networks and reduce their operating costs.  The easiest way to achieve this is to improve the efficiency of the power amplifiers but it has to be achievable without any addition cost penalty. However this is not an easy task as UHF-TV transmitters have to be able to function over a very wide-band from 470 -860MHz.  At NXP we have come up with an innovative way to solve this challenge by developing the UWB Doherty for UHF where we have a 50% relative improvement in amplifier efficiency versus a classical class AB configuration. In addition, it has achieved this innovation without an increase in the bill of materials.

If you dig further down into the real challenges of the transmitter manufacturers it becomes clear they give most of their attention to high energy consumption and the complex cooling systems. An increase in the efficiency of the power amplifier in the UHF-TV transmitter can not only increase the efficiency of the transmitter but would also result in reduced size and cost of the cooling system. With the industry-first ultra wideband solution for Doherty architectures NXP is uniquely enabling manufacturers of these digital transmitters to enjoy the high efficiency gains that Doherty confers with greatly expanded bandwidth. This high efficiency solution uses NXP’s leading edge 50V LDMOS technology and supports the full UHF band without any compromise in power and cost. Over the next few months NXP will create UWB Doherty demonstrators based on the BLF884P and BLF88A.

NXP Semiconductors
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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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