A broadband half mode substrate integrated waveguide balun using composite right/left‐handed transmission line

Abstract

AbstractA broadband half mode substrate integrated waveguide (HMSIW) balun using composite right/left‐handed transmission line is proposed. The proposed structure is consisted of a broadband microstrip Wilkinson power divider and two phase adjusted‐HMSIWs, new CRLH‐HMSIW and HMSIW thru. The broadband microstrip Wilkinson power divider is bridged with the HMSIW in/outputs. The new CRLH‐HMSIW is designed with surface mounted capacitors and printed circuit board (PCB) embedded inductors on the open edge of the HMSIW. The measured prototype shows a 1 dB amplitude imbalance and 180° ± 5° phase difference in a frequency band of 8–13.3 GHz, which has 50% fractional bandwidth. The simulation shows a good agreement with the measurement.