A Single-Pole-Double-Throw Switch Based on Capacitive-Anchored MEMS

David GIRBAU¹, Marco Antonio LLAMAS², Antonio LÁZARO¹, Lluís PRADELL², Jaume PRADA², Pierre CALMON³, Patrick PONS³, Robert PLANA<sup>3

1</sup>Automatics, Electronics and Electrical Department (DEEEA), Universitat Rovira i Virgili (URV), Av. Països Catalans 26, 43007 Tarragona, Spain
²Signal Theory and Communications Department (TSC), Universitat Politècnica de Catalunya (UPC), C/Jordi Girona 1-3, 08034 Barcelona, Spain
³LAAS-CNRS, University of Toulouse, 7 avenue Roche, 31077 Toulouse cedex 4, France

Abstract. In this paper, a 0º/180º phase switch structure for pseudo-correlation radiometers in space missions is proposed. The structure is composed by two networks with same circuit parameters except the transmission phase, shifted by 180º. Switching between networks is performed using Single-Pole-Double-Throw (SPDT) switches based on capacitive-anchored MEMS developed for this purpose in a joint collaboration project between UPC, URV and LAAS-CNRS and fabricated in LAAS-CNRS. The SPDT exhibits isolation better than 30 dB at the design frequency (24 GHz).