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During take off and landing flight phases, helicopters can encounter serious brown-out or white-out problems in dusty, sandy or snowy areas as the downwash of the rotor blades creates dust clouds that can completely engulf the helicopter. This is graphically illustrated in Figure 1 . During landing in particular,...

Along with monopole, patch and slot antennas, the inverted-F antenna (IFA) has become of primary importance for portable and handheld wireless communication units. It is known as a high-efficiency, quasi-omni-directional antenna, with a height of approximately 0.05 to 0.1λ, which is 2.5 to 5 times shorter than a quarter-wave...

Some methods of antenna modeling and measurement lead directly to radiation patterns and total radiated power without the intermediate, and often tedious or impractical, step of calculating self and mutual impedances. 1 Still, it is often desirable and necessary to know the input impedance for each element in the...

The introduction of three-dimensional (3D) electromagnetic (EM) Simulation launched a revolution in microwave design by allowing engineers to design, analyze and refine 3D microwave components on their computers. For the first time, designers could visualize the electromagnetic fields in their device, understand the device’s electrical behavior to an unprecedented...

Today’s test and measurement suppliers face ever-increasing pressure to deliver more cost-effective solutions to users. They strive for higher production rates while producing products with greater complexity. They are therefore being challenged to supply flexible, scalable and efficient test systems that solve these problems. Synthetic instruments that “synthesize” the...

Emerging radar cross section (RCS) measurement needs are making it increasingly necessary to take the measurement system to the target, rather than take the target to a fixed measurement site. With this in mind, QuarterBranch Technologies Inc. set out to build the first truly portable pulsed-IF RCS measurement system...

Microwave and Millimeter-wave Conversion Products MITEQ’s 515-page Microwave and Millimeter-wave Conversion Products Catalog features the company’s latest state-of-the-art mixers, image rejection mixers, modulators, multipliers and custom products. This detailed engineering reference manual features product specification sheets including typical test data, outline drawings, questions and answers, technical applications and notes....

High-power L-band Radar Amplifier The Aethercomm Model SSPA 1.2-1.4-200 is a high power, pulsed RF amplifier that is employed in military L-band radar systems and operates from 1200 to 1400 MHz. This PA was designed for L-band radars on fighter aircraft but can be employed in any system. The...

Monthly Worldwide Semiconductor Revenue The Semiconductor Industry Association (SIA) has released revenue numbers for September 2007 of $25.75 B (raw numbers not three-month moving average). The September numbers are up from $25.50 B in September of 2006 and represent 1.0% growth month-over-month versus 9.0% in August. January 2007 started...

Adaptive Radar Signal Processing Simon Haykin, Editor Wiley Interscience • 243 pages; $94.95 ISBN: 978-0-471-73582-3 This book focuses on two types of radar: Surveillance radar, the purpose of which is target detection in the presence of unwanted signals, interference and noise; and low tracking radar, which is complicated by...