Single-Layered Magic-T using Half Mode Substrate Integrated Waveguide for Ku band

In this paper, a new single layer half mode substrate integrated waveguide (HMSIW) magic-T utilizing H-plane HMSIW power divider and E-plane slotline-to-HMSIW transition has been designed and proposed. By using slotline in the E-plane T-junction, a 180° out-of-phase between two output ports has been generated. In order to optimize return loss and split the input signal equally into two in-phase signals at the output ports, a metallic via hole in the H-plane T-junction has been used. The magic-T is simulated and optimized by Ansoft HFSS software and a Ku-band prototype is designed and fabricated using the standard printed circuit board process. Experimental results demonstrate that the return losses are less than 10 dB, and the fabricated HMSIW magic-T has a 17% bandwidth over frequency range of 12.8-15.2 GHz with 0.34 amplitude imbalances and 3° phase differences in the output ports.