Low Loss, Low Cost, Discrete PIN diode based, Microwave SPDT and SP4T Switches

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  • Author: Liam Devlin, Andy Dearn, Graham Pearson

This paper describes the design, implementation and measured performance of low loss microwave Single Pole Double Throw (SPDT) and Single Pole 4-Throw (SP4T) switches. The switch designs use beam-lead packaged PIN diodes, SMT resistors and capacitors and printed components on a low cost Rogers’ RO4003 substrate. The operating frequency range is 12GHz to 19GHz and the measured insertion loss is 0.85dB for the SPDT and 1.8dB for the SP4T. The switch can handle RF input power levels of at least 2W without any significant compression.