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Industry News

Commercial Software Marches to Battle

The US military seeks to benefit from commercial off-the-shelf communications software.
A few decades ago, military laboratories were the source of much of the technology that emerged in the consumer world, the most famous example being the Internet, which began as a communications network designed to function in the event of a nuclear strike. Today, some in the military believe...
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The Medium-gain Antenna of the MESSENGER Spacecraft

This article describes the design and performance of the medium-gain antenna developed for the MESSENGER spacecraft. The electrical design and performance will be presented, as well as the mechanical design that was necessary to endure the harsh missio...
On August 3, 2004, the MESSENGER probe 1 was launched on its six-year journey to the planet Mercury. The acronym MESSENGER derives from MErcury Surface, Space ENvironment, GEochemistry and Ranging. Commissioned by NASA, and built and operated by the Johns Hopkins University Applied Physics Laboratory (JHU/APL), the probe carries...
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A Compact LTCC Bandpass Filter Using Resonators Loaded with Spiral-shaped Open-circuited Stubs

In this article, a new compact multi-layer low temperature co-fired ceramic (LTCC) bandpass filter is proposed. It is composed of two quarter-wavelength resonators and a K-inverter. The resonators are loaded with two open-circuited stubs, giving an adv...
Recently, as wireless communications systems get smaller and lighter and are able to perform multi-functions, microwave components that have a small size and better performance are required. One of the methods used to meet these requirements is the low temperature co-fired ceramics (LTCC) process technology. The multi-layer technology using...
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An Improved Microwave Weed Killer

Microwave heating can replace toxic chemicals in agriculture to control vegetation and in particular to kill weeds. A suitable horn-antenna array, presented in this article, allows the parallel operation of a large number of magnetrons and an efficient...
Applications of microwave heating are well known and are described in many publications (an exhaustive list of references is given by J. Thuery 1 ). A very promising application of microwave heating in agriculture is to replace toxic, dangerous and environment-unfriendly chemicals used to control vegetation, as described in...
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Next-generation Radios: New Paths for Communications

Anyone who deals with military communications systems today is certain to come face-to-face with the concept of network-centric warfare. The heart of this concept is a reliable and ubiquitous communications system. Success in combat requires that the necessary information and communications links always be made available exactly when and...
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Transistor LC Oscillators for Wireless Applications: Theory and Design Aspects, Part I

The transistor LC oscillator is at the heart of any wireless communications system. Due to their low cost, design simplicity and ease in practical implementation, for example, MOSFET-based oscillators are widely used in modern wireless handset applications. This three-part tutorial highlights the basics of the oscillator circuit design, setting...
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Around the Circuit

Industry News Hittite Microwave Corp. acquired substantially all of the assets of Q-Dot Inc. , a research and development organization advancing mixed-signal silicon integrated circuit technology in data acquisition, signal processing, imaging and communications, from SIMTEK Corp. The acquisition, for $2.2 M in cash, includes Q-Dot’s intellectual property and...
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New Literature

Capabilities Brochure This brochure, entitled “Power & Vision,” provides an overview of the company’s products and services. The company designs, manufactures and distributes an extensive line of specialized amps and related products for OEM applications for industrial, scientific, medical, communications and military use. AR Worldwide Modular RF, Bothell, WA...
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