Tunable evanescent mode X-band waveguide switch

[摘要] A tunable X-band PIN diode switch, implemented in evanescent mode waveguide, ispresented. To allow in-situ tuning of resonances after construction, a novel PIN diodemounting structure is proposed and verified, offering substantial advantages in assemblycosts.Accurate and time-effective modelling of filter and limiter states of the proposed switch ispossible, using an evanescent mode PIN diode and mount model. The model is developedby optimizing an AWR Microwave Office model of a first order switch prototype withembedded PIN diode, to simultaneously fit filter and limiter measurements of four firstorder prototypes. The model is then used in the design of a third order switch prototype,achieving isolation of 62 dB over a 8.5 to 10.5 GHz bandwidth in the limiting state, aswell as reflection of 15.73 dB and insertion loss of 1.23±0.155 dB in the filtering stateover the same bandwidth.

[发布机构] Stellenbosch University