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Monopole antennas are used in mobile communications. A monopole antenna is a very simple and efficient radiating element. 1 It is well known that the smaller the size of the antenna, the lower its efficiency and narrower its bandwidth (a few percent). 2 A 36 percent bandwidth enhancement of...

We come to the final chapter in this history of Microwave Journal ’s first 50 years, a story told through five decades of articles by the industry’s business and technology leaders. This story began with entrepreneurs William Bazzy and Ted Saad founding the magazine and serving as the first...

Antennas Chen, Wen-Shan and Kai-Cheng Yang “Design of a CPW-fed Printed Antenna for Ultra Wideband Applications,” No. 2, p. 120. Link Chen, Wen-Shan and Kuang-Yuan Ku “A Microstrip-fed Monopole Antenna for WLAN USB Applications,” No. 3, p. 104. Link Chen, Wen-Shan and Kai-Cheng Yang “A Compact CPW-fed Rectangle-trapezoid-rectangle Shaped...

The recent launch of Freescale RF high power, high voltage LDMOS devices has made possible the design of kilowatt class power amplifiers in a compact format. A 1 kW power amplifier operating in pulse mode at 27.5 MHz intended for ISM applications has been designed. It is targeted for...

RF engineers are primarily concerned with real signal power when sizing components and implementing controls for optimization of signal fidelity and/or data integrity. In communication links, RF signal power is carefully managed to maintain high performance and reliable connections over some distance. Transmitters carefully monitor signal power to maintain...

Wireless connectivity, whether for simple commercial applications such as garage door openers or for more complex military applications such as ultra-small radios, continues to be an integral part of product innovation. Embedding RF into these different applications often requires highly compact form factors and support for a wide range...

Modern digital communication systems using complex modulations such as Orthogonal Frequency Division Multiplexing (OFDM) or Quadrature Amplitude Modulation (QAM) require controlling bit error rate (BER) in order to achieve a given signal-to-noise ratio (SNR). The achievable BER is a function of many system parameters. Most important among them is...

Northrop Grumman Corp. has been awarded two separate contracts from the US Air Force Warner Robins Air Logistics Center to provide navigation and weather radars and logistical support for the US Air Force, Air Force Reserves and Air National Guard. The Northrop Grumman AN/APN-241 provides high resolution ground maps,...

The US Naval Sea Systems Command awarded Raytheon Co. a $422 M production contract for Standard Missile-2 Block IIIA and Block IIIB missiles. Raytheon will provide SM-2 missiles to the US Navy, Taiwan, the Republic of Korea and Japan. The SM-2 employs dual-mode infrared and radio frequency guidance to...

The Lockheed Martin team developing the next generation Global Positioning System (GPS) spacecraft, known as GPS III, has successfully completed on-schedule an Integrated Baseline Review (IBR) with the US Air Force, an important program milestone that precedes the Preliminary Design Review. GPS III will improve position, navigation and timing...