Design of a W-Band High-Power Ferrite Switch

The millimeter wave frequency bands, especially the W-band frequency, having the advantages of short wavelength, high frequency and wide bandwidth, become increasingly widely used. However, due to their compact sizes and limited accuracy of current manufacturing technology, the millimeter wave devices are difficult to realize. The W-band highpower ferrite switch introduced in this article is switched with a control circuit by folding the double-T, differentiating phase shifter and concatenating 3 dB bridges. Through optimizing the device matching structure, the problem of limited manufacturing accuracy is overcome. Meanwhile, by simplifying the ferrite sample, a 90° phase shift is achieved within the operable range. As a result, the switch realizes the features of a large bandwidth of 8 GHz, less than 2dB single-stage loss, less than 1. 2 standing wave ratio, larger than 13 dB isolation and a 3 ms switch time at a W-band frequency. Furthermore, through cascading and debugging three single-pole switches inside, and upgrading the control circuit, the W-band switch introduced in this article realizes quality features of less than 1. 2 standing wave ratio, less than 5. 9 dB loss and greater than 52. 9 dB isolation within the bandwidth of 8 GHz in the W band. After integrated into radar system, its switch time is 1. 5 ms, and the withstand power is 1. 2 kW.