A W-Band MSIE-based High Isolation, High P1dB SPDT Switch

This paper proposes a magnetically switchable isolationenhanced (MSIE) based SPDT switch, which is composed of controlled magnetic coupling transformer. The MSIE-based SPDT switch possess a strong-coupled transformer with two novel impedance transformation networks. The strong-coupled transformer provides a low-loss path while the impedance transformation networks select the signal transmit to ground or antenna, so that high isolation and low insertion loss are achieved with intrinsic high power handing capacity which is suit for millimeter-wave/terahertz applications. Compared to traditional bulky quarter-wavelength transmission line structure, the proposed MSIEbased SPDT switch occupies a $0.03 \mathrm{~mm}^{2}$ core chip area. Meanwhile, the proposed switch achieves an insertion loss of 2-2.5 dB, an isolation more than 47 dB and a return loss better than 10 dB from 70-105 GHz. The simulated input referred 1 dB compression point ($\mathrm{IP}_{1 \mathrm{~dB}}$) is $\mathbf{3 2. 3} \mathbf{~ d B m}$ at 94 GHz.