Sunday, February 5, 2012

RF-Induced Hyperthermia – Need Help Building This

May 1, 2009

On of our readers needs help building one of these. US Patent Application # 20060190063 Enhanced Systems and Methods for RF-Induced Hyperthermia 24 August 2006 US Cl. 607/101 Intl Cl. A61F 2/00 20060101 A61F002/00 Abstract — A method of inducing hyperthermia in at least a portion of a target area–e.g., a tumor or a portion [...]

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Improving multi-carrier PA efficiency using envelope tracking

April 6, 2009

By Gerard Wimpenny, Nujira Modern complex modulation schemes have the disadvantage of requiring linear power amplification, which compromises overall system efficiency because RF power amplifiers (PAs) are much less efficient when backed off from maximum power. The power amplifier and its associated components consume up to 50% of the overall power in a cellular basestation [...]

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What Every RF Engineer Should Know: Power Amplifiers

April 6, 2009

By Janine Love RF Designline(01/12/2009 1:35 PM EST) Power amplifiers (PAs) are a hot topic on the RF DesignLine, so I had a virtual “sit down” with some leaders in the industry to see where the technology is, and where they think it is going. The following article includes some of the thoughts and remarks [...]

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Reconfigurable CMOS RF front-end for software radio

April 6, 2009

With the use of cellular phones surging globally, designers around the world are racing to build a mobile radio that is flexible enough to handle current and future standards. Software-defined radio (SDR) seems to be the answer, but achieving such a solution with all the attributes of cost, power and size is not trivial. While [...]

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Wilkinson’s Microwave Power Divider-Raminder Singh Updated

February 24, 2009

Wilkinson Power Divider Objective: A. To Design a 3-dB Wilkinson power divider on 0.031” thick Duroid using a surface-mount 100Ω chip resistor between the two arms of the power divider. Design Specifications: 1. Structure must fit in the board size of 38 x 50 mm. 2. Center frequency = 2.4 GHz 3. Return Loss at [...]

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