Industry News

The Puzzler - August 2011

Math, Science and Logic Puzzles - for the "enginerd" in all of us (re-printed with permission from Pzzls - www.pzzls.com ) Download the Puzzler (PDF) The Smith Jones Robinson Riddle On a train, Smith, Robinson and Jones are the fireman, brakeman and the engineer, but NOT respectively. Also aboard...
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IEEE MTT-S IMS2011: Busy in Baltimore

The energy and activity levels of a large crowd are hard to quantify, but by the accounts of most observers, there was plenty of both at the International Microwave Symposium 2011 in Baltimore, MD, June 5-10. Event managers said the official attendance was more than 8600 participants. This number...
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G/T for a Satellite-Terrestrial Handset with Internal and External Antennas

In this paper, the figures of merit for a satellite-terrestrial handset with internal and external antennas are extracted, based on the antenna measurements with the handset mechanics in free space. The gain statistics are derived from the measured ant...
The figure of merit (G/T) for a satellite-terrestrial handset is a critical parameter for the link budget calculations, where G is antenna gain, which varies with elevation and azimuth angles, and T is the system noise temperature, which is the sum of the handset receiver and its antenna noise...
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Design of a Fifth-order Analog Predistorter for Base Station HPA of Cellular Mobile Systems

This article presents the design of a fifth-order analog predistorter for use in base station high power amplifiers (HPA). The predistorter employs two intermodulation (IM) signal generators with identical configuration, to individually generate the th...
The high power amplifier is an important building block in wireless communication systems, but is inherently nonlinear. The nonlinearity results in intermodulation of the input signals, causing intermodulation distortion products at the output of the HPA and hence adjacent channel interference. 1 Thus, linearization methods are usually employed in...
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Compact CPW-Fed UWB Antenna with a Notched Band Characteristic

A CPW-fed, ultra-wideband, antenna with a band-notch characteristic is presented. The antenna consists of a CPW ground with a wide slot, a fork-like radiation patch, a tuning stub and a 50 Ω CPW-fed structure. The notched band frequency is obtaine...
With the development of modern wireless communications, the ultra-wideband (UWB) systems have attracted much attention recently because of their advantages, including high speed data, small size, low cost and low complexity. The antenna of the ultra-wideband systems plays an important role in the receiving and transmitting of ultra-wideband radiation....
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