RF & Microwave Industry News

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Over-the-air broadcast TV channels are separated by unused frequencies. This “white space” in the broadcast spectrum varies with the channels present in a locale and creates opportunities for other applications. As a step in putting these unused channels to practical use, the IEEE has started work on a standard...

Ultra-Wideband Radio Technology Kasimierz Siwiak and Debra McKeown John Wiley & Sons Ltd. 264 pages; $95 ISBN: 0-470-85931-8 This book is designed to give a basic overview of the subject of ultra-wideband (UWB) technology. It grounds the reader with a brief history, offers an understanding of the current regulations...

UltraSource is a high quality supplier of precision thin film circuit fabrication including custom resistor networks and attenuators, metallized substrates and MEMS fabrication with a focus on using its thin film manufacturing capabilities to supply custom products from prototypes to high volume production. The products range in application from...

Comprehensive on-site testing of base stations using real-world scenarios, both at initial installation and then during ongoing maintenance, plays a vital role in preventing and solving performance problems before they impact subscribers. Thorough independent testing gives operators greater confidence in the quality of the deployed network. Poorly performing base...

M/A-COM is a longtime supplier to the military, Navy, Army and Air Force of GaAs MMICs, employed in active phased array radars. To date, the company’s GaAs process of choice has been its Multifunction Self-aligned Gate (MSAG™) process. MSAG features selective ion implantation with noncontacting stepper lithography to provide...

For more than 15 years, Spectrum SEI Microwave has developed PIN diode and MMIC-based switched filter banks. Recent advancements have made micro-electromechanical systems (MEMS)-based RF switches advantageous for particular applications. The model 310-020022-001 is SEI’s first MEMS-based switched filter bank. Switching The company was presented with a need for...

Digital RF memories (DRFM) are used for the reproduction of complex, coherent signals usually associated with modern pulse compression radars. There are many different implementations of DRFM systems. Figure 1 displays one particular type, a double sideband, four-bit, phase sampled system with 500 MHz of instantaneous bandwidth. Fig. 1...

In a typical multi-carrier power amplifier (MCPA) application, it is well known that good amplitude matching and good phase matching are required for greater reduction of intermodulation distortion (IMD) or for better harmonic rejection within the CDMA spectral mask. To solve the mismatching problem, it is desirable to accurately...

Wideband, low noise, generic gain block and driver amplifier MMICs have been developed using many different device technologies including MESFET, HBT and PHEMT. Among these, PHEMT-based MMIC technologies have achieved superior performance due to inherent device high frequency operation capability. In order to achieve superior performance similar to PHEMT...

Remote sensing is a multi-disciplinary activity that deals with the inventory, monitoring and assessment of natural resources, following the analysis of data obtained through observations from a remote platform. This technology, under development since the early 1960s, has shown great promise in improving the information collection regarding the world’s...