Design of Ka Band Rotary Joint in Printed Microstrip Gap Waveguide Technology

Document Type : Original Article

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Faculty of Electrical and Computer Engineering, ,graduate University of Advanced Technology, Kerman, Iran.

Abstract

A millimeter-wave rotary joint based on printed microstrip gap waveguide technology is presented. To this goal, a unit cell structure which its bandstop contains the desired frequency band was first designed. The rotary joint structure is proposed as a rectangular cavity surrounded by the designed periodic mushrooms realized on microstrip board and its top layer is a metallic disk placed with an air gap distance from microstrip board. The rectangular cavity is fed by two coaxial ports connected at its both sides. Simulation results show a narrow band insertion loss for designed rotary joint because the cavity is excited at its first mode. To widen its bandwidth, shorting patch and window are introduced in the cavity. The dimensions of the proposed rotary joint were optimized by time domain solver of CST software to obtain the best insertion loss behavior over the desired frequency band. Simulation results show the return loss is better than 10 dB and the insertion loss is less than 0.5 dB over about 21% relative bandwidth. Comparsion of the simulation results with those obtained by freqency domain solver of CST software and HFSS simulator confirms the accuracy of the design and simulations.

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