X-band, 0.25 dB loss, high isolation MESFET switch with good input and output match

摘要

The design and measured performances of a very low-loss, single pole single throw (SPST) switch operating in the C-X-band frequency range is presented. This MESFET based MMIC switch achieves 0.25 dB insertion loss, high isolation (<25 dB) and 20 dB input and output return loss in both switch states over the 7-9 GHz frequency band. This design is unique in the sense that the switch maintains a very good impedance match in both the operating states without increasing the through insertion loss.