DESIGN X-BAND TRANSITION FROM RECTANGULAR WAVEGUIDE TO SUBSTRATE INTEGRATED WAVEGUIDE

Abstract

This paper presents the design of a right-angle transition from rectangular waveguide (RWG) to substrate integrated waveguide (SIW) operating in the X band frequency in order to overcome the limitation of the size of traditional rectangular waveguides. The transition is designed with a metal coupling aperture with a two-step ridge and a PCB converter, including three coupling slots, etched on the top of the PCB board. The transition is designed to be easily mounted directly onto the systems using traditional rectangular waveguides. The transition is aimed to use microstrip circuit technology to directly integrate the receiver's low noise amplifier on the same PCB board so that the system size can be reduced significantly. The design is simulated on 3D High-Frequency Simulation Software (HFSS). The simulation results show that the reflection coefficient S11 is less than -15 dB, the insertion loss S21 is less than 1dB in the frequency range from 8.3 GHz to 9.85 GHz.