Microwave Journal articles from April 1999

Microwave Journal archives from April 1999

SSPA linearization.(solid-state power amplifiers)
April 1, 1999... The growth of cellular telephone services and other forms of personal communications have created a demand for highly linear amplifiers. In the case of cellular telephony, it is often more convenient and cost-effective to transmit several...

A wideband VCO for set-top applications.
April 1, 1999... The ever-increasing competition in the direct broadcast satellite (DBS) market to offer more services (channels) and lower costs has significantly heightened interest in the design of wideband commercial low cost VCOs for the DBS systems'...

Design and implementation of an L-band PLL frequency synthesizer.
April 1, 1999... In 1932, De Bellescize published his synchronized detection theory and described the PLL for the first time. In 1947, a PLL design was first applied in synchronize scanning of a television receiver. During the 1970s, owing to the rapid...

Miniaturized low cost 30 GHz monolithic balanced BPSK and vector modulators.(part 2)
April 1, 1999... The balanced modulator topology requires a total of four couplers, one each for the input and output and one within each single-stage branch. Generally, in monolithic designs, a 3 dB power split is achieved by employing Lange couplers. However,...

GSM base station power amplifier module linearity.
April 1, 1999... RF power amplifiers (PA) are the final amplification stage before the antenna in a base station transmitter. Base station transmitted signals must be spectrally efficient to achieve the highest channel capacity available in the GSM transmit...

Miniature, low noise cryogenic amplifiers.(JS series from MITEQ Inc.)(Cover Story)
April 1, 1999... The ability to cause improvement in a GaAs amplifier's noise figure performance by decreasing the base plate temperature has been common knowledge for many years. Various industries and disciplines such as radio astronomy and satellite...

Ultralinear wireless amplifiers using low cost building blocks.(PA1124C and PA1125C linear power amplifiers from Phoenix Microwave)(Product Announcement)
April 1, 1999... Linear power amplifiers (LPA) play a very important role in high performance wireless base stations. Modern multicarrier LPAs improve cell site performance and capacity significantly. Older base station equipment used single channels, each...

A precision TNC connector gage kit.(AO12E gage kit from Maury Microwave Corp.)(Product Announcement)
April 1, 1999... With the large number of TNC connector variations on the market and the critical nature of the connectors' dimensions to ensure proper mating, a means to check these dimensions accurately has quickly become a necessity. The model A012E...

An ultralinear amplifier for PCS applications.(SM1720-48L solid-state amplifier from SSB Technologies)(Product Announcement)
April 1, 1999... As PCSs are being deployed, many service providers are discovering that conventional base stations do not always provide satisfactory service over the entire cell area. This deficiency typically is caused by two factors: coverage holes due to...

Self-aligning coaxial PCB connectors.(SLB/SA series from Applied Engineering Products)(Product Announcement)
April 1, 1999... One of the more common problems faced by designers of RF and microwave equipment who incorporate multiple PCBs is connecting the boards directly together so that the RF signals are transmitted properly between PCBs. This problem occurs because...