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TECHNICAL FEATURE CAD of a Compact Monopulse Comparator Network Using Planar Magic Tee Junctions for Airborne Slotted Array Antennas The operating principle and design of compact, non-standard, reduced height waveguide planar magic tee junctions are described. The distinguishing feature of these components is the placement of the difference port...

TECHNICAL FEATURE Thermal Modeling of Heterojunction Bipolar Transistors with Pulsed I-V Measurements An extraction procedure for thermal parameters of high power heterojunction bipolar transistors (HBT) with pulsed I-V measurements is presented. The pulsed measurements become essential to model thermal effect and frequency dispersion of high frequency devices. The measurement...

TECHNICAL FEATURE A Four-port Microwave Measurement System to Speed On-wafer Calibration and Test A four-port measurement system comprising an inexpensive coaxial switch matrix and a comprehensive free software package extends the capabilities of a user's two-port automatic network analyzer and probe station to three- and four-port measurements. The software...

TECHNICAL FEATURE Exploiting Filter Symmetry Randall W. Rhea Eagleware Corp. Norcross, GA S ymmetry is an element of beauty. Besides it's esthetic appeal, symmetry is practical. Symmetry has two important manifestations in electric-wave filters: symmetry with respect to element values mirrored about the input and output (physical symmetry) and...

TECHNICAL FEATURE Nyquist Quadrature Frequency Shift Keying for Spectral Efficiency Frank Amoroso Santa Ana, CA T he selection of a data modulation scheme for radio transmission usually involves a trade among a number of parameters, including communications efficiency (bit error rate (BER) vs. signal-to-noise ratio), bandwidth efficiency and factors...

TECHNICAL FEATURE A Low Cost Planar Filter for 60 GHz Applications A low cost printed planar filter on alumina ceramic substrate was developed at 60 GHz. This filter is advantageous in cost, size, weight and connectivity to MMICs. It is especially suitable for millimeter-wave module integration, where MMICs and...

Special Report A Band For All Reasons Software radios promise to radically redefine battlefield communications. This Special Report is reprinted from the January 2001 issue of our sister publication, the Journal of Electronic Defense. Although it describes military applications, much of the material is common to emerging commercial radios....

TECHNICAL FEATURE University Engineers Team With Wireless Industry For Mutual Benefits Phil Leslie College of Engineering, University of South Florida Tampa, FL S ymbiosis is the key in the marriage of higher education and industry. That's what Larry Dunleavy thinks. That's what his colleagues think. So do their many...

Tutorial MEMS for RF/Microwave Wireless Applications: The Next Wave Microelectromechanical systems (MEMS) technology is on the verge of revolutionizing RF and microwave applications. 1 The requirements of present day and future RF/microwave systems for lower weight, volume, power consumption and cost with increased functionality, frequency of operation and component...

THE BOOK END RF/Microwave Circuit Design for Wireless Applications Ulrich L. Rohde and David P. Newkirk John Wiley & Sons Inc. 954 pages; $125 ISBN: 0-471-29818-2 This book clarifies RF theory and provides practical applications in developing RF/microwave circuits for wireless applications. The book discusses the RF circuit blocks...