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Currently, radar , electronic warfare and communications and other electronic equipment in the microwave circuit miniaturization , \, low price and high reliability. This article should microwave circuit miniaturization, integration , low-cost trends , the use of fine microstrip technology , WCDMA system as the background for the the repeater most important radio link section , do the following work : 1, the design 3dB Lange coupler, Lange coupler design with small size , isolation , input output VSWR bandwidth , etc. , suitable for a variety of microwave circuits . Design having a high selectivity for class elliptic function microstrip bandpass filter using a filter connected in series to achieve a high degree of inhibition method , this method reduces the workload of filter design and debugging time . 3 , combined with 3dB Lange coupler and a class of elliptic function microstrip filter design microstrip diplexer , the designed microstrip diplexer phase of literature ( such as [2] , [3]) mentioned microstrip splitters and microstrip filter microstrip diplexer ) compared to , the degree of isolation between the upper and lower rows of the text microstrip diplexer better addition diplexer having a high selective and the advantages of small size . 4 , combined with 3dB Lange coupler and amplifying devices designed balanced amplifier , combined with a balanced amplifier and high selectivity microstrip filter produced frequency-selective amplifier module , the measured results show that the selected frequency amplifier module with low noise , high gain frequency amplification components also has the advantages of small size and high linearity , etc. , of the election . Finally, combined with microstrip diplexer and frequency-selective amplifier module designed a micro-repeater for WCDMA test results show that the repeater downlink uplink inhibition did not reach the indicator , other indicators have reached the system requirements, high and low temperature test data show that this micro-repeater indicators can maintain a stable in a wide temperature range , with good temperature characteristics and reliability .
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