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It is common practice to use directional couplers in the HF range (3 to 30 MHz) for high power RF/microwave applications, such as magnetic resonance imaging (MRI), plasma generation for semiconductor processing equipment and laser drivers, in order to measure the transmitted and reflected powers accurately. Microstrip-type directional couplers...

The oscillator is a critical part of modern wireless communication systems. It is the local oscillator that is used to up-convert the baseband signal to the desired RF frequency in the transmitter. Vice versa, the local oscillator is used to down-convert the desired signal in the receiver. In the...

Coplanar Microwave Integrated Circuits Ingo Wolff Wiley Interscience • 557 pages; $120 ISBN: 0-471-12101-0 The subjects of this book—materials, technology, design and realization of coplanar microwave integrated circuits—combine the research results of a large research group under the leadership of the author. Chapter 1, the introduction, describes the different...

Heterojunction bipolar transistors (HBT) have demonstrated high power output densities at microwave frequencies and are increasingly utilized in the design of RF circuits such as power amplifiers, oscillators and mixers. 1 Thus, an accurate large-signal model for HBT devices is of great importance in designing such circuits, especially when...

Modern wireless communication systems utilize digital modulation techniques employing linear complex coding schemes to maximize the channel throughput available capability. Also, a broader channel bandwidth is used for more data transmission than before. In addition, as various communication services, such as cellular phone (IS-95), personal communication service (PCS), IMT-2000...

GaN Broadband Power Amplifier The model SSPA 0.5-3.0-50 is a high power, broadband, GaN RF amplifier that operates in a frequency range from 0.5 to 3 GHz. This PA is ideal for broadband military platforms as well as commercial applications because it is robust and offers high power over...

Advanced Control Components Inc. announced that it has received a production order in excess of $3.7 M from the National Radio Astronomy Observatory for a dual-channel downconverter/switch matrix used on the ALMA Program. ALMA (Atacama Large Millimeter Array) is an international collaboration to develop a world-class telescope composed of...

Published April 6, 2007 In an effort to better combine the editorial content of our magazine with our newly developed and retooled on-line presence, we have decided to expand Harlan's RF and microwave engineering advice into a monthly feature that appears in Microwave Journal. Harlan has selected one question...

Varactor-tunable filters attract the attention of microwave specialists due to a number of advantages that can improve the overall performance of communications and radar receivers, as well as measuring equipment. One of the drawbacks of such filters is a considerable variation in bandwidth (BW) and insertion losses (IL) within...

Planar monopole antennas, with their advantages of low cost and wideband characteristics, are widely used in wireless applications. 1 However, they suffer from distortion of the radiation pattern at higher operating frequencies, which leads to a directional radiation. 2,3 A cross monopole antenna has been implemented to overcome the...