60-70 dB isolation 2-19 GHz MMIC switches

High-isolation switches are made with p-i-n diodes in a channelized microwave-integrated-circuit structure. Although the performance of these switches is acceptable, they are difficult and costly to produce. GaAs high-isolation switches that offer a high-performance, low-cost, reproducible alternative are presented. A number of novel high-isolation features have been incorporated, all using standard monolithic-microwave-integrated-circuit (MMIC) processing. Isolation greater than 70 dB for a single-pole, single-throw switch and 62 dB for a single-pole, double-throw switch has been achieved. This represents a substantial improvement over the present 40-dB state-of-the-art isolation.<>