A Broadband Fixed Phase Shifter in Substrate Integrated Waveguide Technology

This paper presents a method to design low cost microwave phase shifters in substrate-integrated waveguide (SIW) technology. The proposed phase shifters are based on removing some regions of the SIW substrate as well as top and bottom metal planes. It is shown that by proper selection of the position and orientation of the introduced air strips maximum possible phase shift may be achieved while radiation leakage is precluded. On that bases a broadband phase shifter is designed. The proposed design provides a 45° phase shift with a return loss higher than 17 dB across the frequency band of 10 to 14 GHz.