Design of high power Ka band waveguide latching circulator

Abstract

In radar systems and other applications circulator is an important component used for isolation or duplexing. In modern polarimetric radars it is required to transmit vertical and horizontal polarization turn by turn while receive both co and cross polarizations to serve this purpose switching (latching) circulator is inevitable device. Three port junction waveguide circulators are most widely used form of the circulators for high power conditions. This paper discusses the design a high power three port waveguide latching circulator at Ka band. The Design is done around centre frequency of 32.5 GHz using HFSS. Design is specifically made with dimension of WR-28 waveguide, so the device can be directly installed in the system using WR-28 waveguide. Isolation in excess of -45 dB is observed and Insertion Loss fraction of a dB is obtained which is quite competent with industrial standards. Latching ferrite H-plane wave guide Y-junction circulator with internal magnetic return paths has widespread applications in radars and radiometers and works as protective devices in microwave receivers.