A Waveguide Power Divider With Zebra Chip and Isolated Output Ports for 400–510 GHz

Abstract

We present a broadband waveguide power divider for the 400–510 GHz band with low insertion loss and good isolation between the output ports. It is used in the LO distribution system of the CHAI LFA heterodyne receiver for the CCAT observatory to feed 32 balanced SIS mixers with each LO source. A silicon membrane chip with a zebra stripe pattern of resistive titanium nitride (TiN) is placed at the tip of the split block waveguide Y-junction to improve the isolation.