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.

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...


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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Researcher Says RF Turning India Into “Open Microwave”

Researcher Says RF Turning India Into “Open Microwave”

The Times of India has quoted Girish Kumar, a researcher and faculty member at IIT Bombay, as saying that “the mobile towers in India are turning the country into an open microwave." His remarks were made at the national seminar on mobile phone and tower radiation-risks and remedies presented by the Government Polytechnic Bicholim, Goa Chamber of Commerce and Industry, and department of science, technology and environment.

Kumar who has conducted studies on mobile radiation said, "With 1 W power, temperatures increase by 1o C in 500 seconds (9 minutes)”. He noted that mobile companies were choosing to install higher-power transmitters to cut costs but were compromising on public safety. Citing a case study in which six residents of a high-rise Mumbai building facing a mobile tower were afflicted with cancer, he noted a rise in cancer cases among residents living near wireless system towers. "Those living in a 50 to 300 m radius face a high risk -- much worse than smoking -- as you cannot see or smell radiation," he said, while adding that "you cannot have coincidences everywhere".

"Biological effects include drying of fluids around the eyes, brain joints, heart, and abdomen leading to sleep disruption, headaches, lack of concentration and memory loss caused by changes in the electrical activity of the brain. Prolonged exposure to mobile radiation increases chances of cancer by 200 to 400% over 8 to 10 years," Kumar stressed. It can also lead to miscarriages as it affects the amniotic fluids, he added. Citing examples of farmhouses, Kumar also observed that mobile tower radiation was affecting the environment and fruit-bearing trees as well as birds.

Kumar said the Specific Absorption Rate (SAR) in India has been fixed at a much higher level than it should be to benefit telecom operators who contribute 30% of India's GDP. He felt part of the solution lay in reducing the transmitted power from towers which would necessitate setting up of additional towers at a much higher cost.




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MMD March 2014

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The Design of Ultra Narrowband Amplifiers Using Small-Signal Varactor Upconverters
This paper presents a method of realizing tunable microwave amplifiers with ultra narrow bandwidths that can be less than 0.5% by the use of a varactor up-converter (UC).
Planar Monolithics

Directivity and VSWR Measurements
Return loss and VSWR measurements are complicated by the finite performance of the directional device used to measure the reflected power. The only accurate and convenient way to make return loss measurements is with a well matched high directivity directional coupler or bridge.
Marki Microwave

Switch Solutions for Systems with Low PIM Requirements
Dow-Key Microwave has invested in R&D for new RF switch products designed specifically to reduce intermodulation (IM) in coaxial switches.
Dow-Key Microwave

How to Specify RF and Microwave Filters
Covers cavity, ceramic, LC, crystal and helical filters.
Anatech Electronics

Mounting Considerations for Medium Power Surface-Mount RF Devices
Covers all factors that must be considered when mounting SMT devices.
TriQuint Semiconductor

Biasing MMIC Amplifiers
How to bias MMICs along with theory and techniques.

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