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A New Spread-spectrum Measurement Method for Satellite Transponder In-orbit Testing This article introduces a new measurement method for beginning-of-life and in-service testing of satellite transponders that utilizes spread-spectrum signals. The basics of this new method, which permit measurement of amplitude and group delay of a transponder channel, are presented....

TECHNICAL FEATURE A High Efficiency Bow-tie Antenna for Impulse Propagation An investigation into the problems associated with using modified dipole antennas to propagate temporally short electrical impulses is described. Experimental data is presented which shows that the time domain characteristics of the bow-tie antenna can be improved by reactively...

TECHNICAL FEATURE A Method of Measuring Large-signal S-parameters of High Power Transistors A measurement method for scattering parameters (S-parameters) of high power transistors is presented. The proposed method directly determines the S-parameters of high power transistors by measuring overall gain, phase and S-parameters of input and output matching network...

TECHNICAL FEATURE Improved Gain for a Dynamic Envelope Tracking Amplifier in Cellular Radio Handsets An envelope tracking (ET) amplifier with variable bias voltage is a potentially more efficient power amplifier technique for third generation cellular phones. However, the input and output impedances of the transistors vary with the bias...

TECHNICAL FEATURE Design of a Planar Microstrip Balun at S-band An innovation for the Marchand balun model is presented. The structure of the designed planar microstrip matching circuit is fairly simple, practical and easily fabricated without requiring complex multiple metal or dielectric layers. Moreover, the designed balun performs well....

IMS 2001: Chicken Little Was Wrong Frank Bashore Microwave Journal staff How can the sky be falling on the RF/microwave industry when over 11,000 participants braved 100°+ heat to attend Microwave Week in Phoenix in May? IMS 2001 was the biggest and best symposium and exhibition yet, and the...

THE BOOKEND * Radio-Electronic Transmission Fundamentals B. Whitfield Griffith, Jr. Noble Publishing Corp. 648 pages; $75 ISBN: 1-884932-13-4 This is a reprint of a textbook originally published in 1962. It is intended to bridge the gap between the elementary and advanced technical works pertaining to the generation and transmission...

AROUND THE CIRCUIT INDUSTRY NEWS * Plexus Corp. completed its previously announced acquisition of electronic manufacturing services provider Qtron Inc. Plexus paid approximately $30 M in cash and assumed approximately $17 M in debt, in addition to Qtron's ordinary trade payables. The acquisition was financed through Plexus' existing capital...

THE COMMERCIAL MARKET MEMS Industry Matures, Big Changes Lay Ahead Having plugged away for the last decade, MEMS (microelectromechanical systems) technology is about to shrug off the flash-in-the-pan mantle some have bestowed upon it, and emerge as a bona fide industry, according to Cahners In-Stat Group ( http://www.instat.com )....

COMING EVENTS 2001 IEEE Emerging Technologies Symposium on Broadband Communications for the Internet Era September 10­11, 2001 Dallas, TX Sponsor: IEEE, Dallas Section. Topics: Third-generation cellular, LMDS, network planning and management, Internet standards and protocols, wireless infrastructure, fiber optics, WDM, optical CDMA, WLL, WLANs, Bluetooth, software radio, systems-on-a-chip, embedded...