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Antennas

Agilent News: Industry's First Oscilloscope-Based DDR2 Compliance Test Application

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Agilent Technologies Introduces Industry's First Oscilloscope-Based DDR2 Compliance Test Application
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M/A-COM JOINS MULTIMEDIA OVER COAX ALLIANCE (MoCA®

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Alliance Membership will Supplement M/A-COM's End-to-End Coaxial Cable Offerings
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Characterization of Ultra-wideband Bow-tie Antennas for Ground Penetrating Radar Systems

In this article, two ultra-wideband (UWB) bow-tie antennas, designed for ground penetrating radar (GPR) applications, are characterized by both numerical analysis and experimental measurements. The geometry and the different materials of the feed and t...
Francesco Soldovieri IREA-CNR, Naples, Italy, Giancarlo Prisco and Adriana Brancaccio Second University of Naples, Italy; Giovanni Leone, University o
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In recent applications of telecommunications and remote sensing at radio, microwave and terahertz frequencies, the exploitation of ultra-wideband (UWB) antennas is growing steadily. 1 In subsurface prospecting, for example, they can provide higher imaging resolution and better target characterization. 2 The design and analysis of such high performance antennas...
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An Actively-controlled Microwave Reflecting Surface with Binary-pattern Modulation

This article describes an actively-controlled reflecting surface, capable of modulating the microwave energy incident upon it. The surface is a composite structure holding an array of conventional semiconductor diodes excited with a set of pulses in a ...
P.S. Neelakanta, A.K. Stampalia and D. De Groff, Florida Atlantic University
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For specific applications, there is a need for materials or composite structures which can reflect and/or absorb the electromagnetic (EM) energy incident upon them in a desired or controllable fashion. Such reflective EM absorbing/reflecting materials 1-3 are useful in designing smart radar cross-section (smart RCS) surfaces and radio frequency...
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Flash in the Plan

Directed-energy weapons remain more experimental than available.
Ted McKenna, Journal of Electronic Defense
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The detonation by the United States of a nuclear warhead 30,000 feet above Johnston Atoll in July 1962 lit up the night sky above the Hawaiian Islands, 800 miles away. It also created a power surge that shut down the streetlights and phone system of Oahu as well as...
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A Compact Dual-band Antenna for WLAN Applications

Johanson Technology Inc.
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In the world of portable electronics, antennas are problematic. They need to be small, light weight and possess the ability to perform well in a variety of conditions. It also helps if they can be neatly integrated into the product without protrusions that can be easily damaged or broken...
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Application of GTEM Cells to Wireless Communication Transceiver Designs

The GTEM cell has been widely accepted as a sufficient tool in electromagnetic compatibility for both radiated susceptibility tests and radiated emission tests. In this article, the relationships among basic quantities such as input power, electric fie...
Ping Hui, Nokia Mobile Phones
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The gigahertz transverse electromagnetic mode (GTEM) cell was first proposed in 1987 1 and subsequently patented in 1989 by D. Konigstein and D. Hansen 2 as a high frequency variant of the transverse electromagnetic mode (TEM) cell, which is also known as the Crawford cell. 3 The GTEM cell...
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Generating a Plane Wave in the Near Field with a Planar Array Antenna

This article presents a method of generating an approximate plane wave in the near field using a planar phased array antenna. Optimized complex array weights are found using a genetic algorithm and a least squares solution. The genetic algorithm (GA) p...
Randy Haupt, Utah State University
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Measuring far field antenna patterns requires separating the transmit antenna and the antenna under test (AUT) by a large distance in order to minimize the field amplitude and phase variations across the test aperture. When the AUT is many wavelengths across, the far field distance becomes quite large. Thus,...
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An Ultrabroadband Indoor Antenna with Style

Huber + Suhner
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Wireless communication applications have really taken off over the past two decades. In addition to voice services, wireless systems are now also handling an increasing volume of data traffic, with a demand for high transmission capacities. To provide these capacities, mobile radio cells (AMPS, GSM, PCS and UMTS) are...
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Dual Slant Linearly Polarized Antenna for Broadband High Power Applications

Nurad Technologies Inc.
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Enhanced performance is needed from antennas, radomes and other microwave components to support ever-increasing functionality for military communications and electronic warfare (EW) applications. There is a continuing demand for antennas with broader bandwidth, higher power handling and better controlled radiation patterns, while at the same time reducing size and...
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