Conmutadores de fase de 90º en tecnología híbrida microstrip

Abstract

This work describes the design and characterization of three different 90º phase switches working in the Ka-band. The phase switch is intended to be part of a radio astronomy receiver which works in the 26-36 GHz frequency band. The designs are based on the use of wideband band-pass filters with single-pole double-throw (SPDT) switches in order to select the transmission path. The design of the filters are performed in a 5-mils thick Teflon-based substrate (CLTE-XT) microstrip technology, showing an average phase shift of 89º±4º over the 24-37 GHz band with an amplitude imbalance of 0.1dB. The switch function is analyzed using three different SPDTs: a PIN diode based switch, MMIC PIN diode switch and MMIC pHEMT switch.