Microwave Journal articles from February 1999

Microwave Journal archives from February 1999

Device and circuit approaches for next-generation wireless communications.
February 1, 1999... Wireless communications continue to gain importance in both the commercial arena and the military domain. However, while data rates are increasing to accommodate video and data as well as voice traffic, a conflicting need exists to reduce power...

A starlet's secret life as inventor.(Hedy Lamarr)
February 1, 1999... Hedy Lamarr is being showered with honors for advancements in military communications based on her anti-jamming patent from the '40s. Editor's Note: The following article by Peter Y. Hong is reprinted with permission from the Los...

Design considerations for multicarrier CDMA base station power amplifiers.(code division multiple access)
February 1, 1999... This article presents an overview of the issues involved in designing or selecting a transmit power amplifier for multicarrier CDMA base stations. CDMA signal characterization, technology selection, amplifier sizing, linearization, thermal...

A simple GMSK modulator for microwave and millimeter-wave frequencies.(Gaussian minimum shift keying)
February 1, 1999... A simple hardware architecture for effective realization of Gaussian minimum-shift keying (GMSK) modulation at microwave and millimeter-wave frequencies is presented. The modulator is based on achieving continuous linear phase modulation of a...

Fiber optics enhance wireless broadband system deployment.
February 1, 1999... Wireless broadband systems are a perfect solution to today's multimedia network requirements. Broadband channels provide multiple video channel delivery, high speed Internet access, and voice and computer network extensions, including...

Cost analysis of rework and test.(reworking involved in the manufacturing assemblies of microelectronic parts)
February 1, 1999... A common dilemma encountered in high volume manufacturing of medium-complexity parts or assemblies is how to estimate whether it is more cost-effective to rework parts that fail a particular test criterion at some point in the process or simply...

An RF power amplifier for whole-body MRI scanner applications.(radio frequency; magnetic resonance imaging)(Cover Story)
February 1, 1999... Approximately 20 years have passed since the introduction of magnetic resonance imaging (MRI) scanners. In that time, this once-ridiculed technology has become a mainstream medical imaging modality. Coupled with MRI's anatomical imaging...

Improved composite metal for high performance semiconductor applications.
February 1, 1999... As performance demands on silicon and GaAs devices continue to increase, so do thermal management concerns and the need for cost-effective packaging alternatives. In addition to heat dissipation, concerns such as material compatibility must be...

Broadband high frequency SMT packages.(surface-mount technology in electronics industry)
February 1, 1999... For many years, the electronics industry has been using surface-mount technology (SMT) components because of their ease of integration, low cost and standardization. One drawback has been the lack of a single broadband, low parasitic package to...