volume | PIER Journals

Abstract

In this paper, a compact microstrip line (MSL)-to-circular waveguide (CWG) transition using a rectangular patch is introduced. As the rectangular patch is placed 2.68 mm (0.043 λg) away from the short-circuited plane of the CWG, the transition is very compact. By truncating the rectangular patch of the compact MSL-to-CWG transition, a compact MSL-fed CWG polarizer using the corner-truncated patch is proposed. The proposed polarizer has a compact size and a phase difference of -90.97° at 9.65 GHz. The axial ratio is within ±1 dB from 8.5 GHz to 10 GHz. The reflection coefficient is smaller than -10 dB from 9.03 GHz to 10.5 GHz. In addition, as the corner-truncated patch is adopted, the proposed polarizer does not require a complex manufacturing process on the waveguide. Moreover, as the microstrip line feeds the polarizer, it can be easily integrated with other planar circuits. To verify the simulation results, the MSL-fed CWG polarizer using the corner-truncated patch is fabricated and measured. The simulation and measurement results are in good agreement.

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Dr. Ir-Ving Tseng

Prof. Chun-Long Wang