Novel millimeter‐wave vertical transition between rectangular waveguide and balanced transmission line using embedded magnetic closed loops

Abstract

AbstractA novel transition between rectangular waveguide (RWG) and balanced transmission line with magnetic closed loops has been developed. A conventional RWG directly mounts on a printed circuit board that actualizes energy transition. Using a pair of centrosymmetric magnetic closed loop, the TE10 mode converts to TEM mode, and balanced ports are obtained. Based on the structural characteristics investigation, the transition is fabricated and measured. The center frequency of the operation is 32.5 GHz, and the bandwidth is wider than 27% for insertion loss no more than 0.6 dB and return loss more than 15 dB. Between the two balanced ports, the magnitude imbalance is less than 0.4 dB, and the phase difference is less than 3°. Integration within the balanced ports makes the transition a promising candidate for miniaturized system in antenna.