Ultra-compact C-band waveguide loop coupler

Design, simulation and fabrication of a compact waveguide loop coupler have been reported in this paper. Design coupler has little ripple in whole design band (less than 1dB) andhigh directivity (more than 16dB for whole band and more than 18dB for 30% of C band). Fabrication results indicate the simulation and measurement result are in a good agreement