| Summary: | 碩士 === 國立彰化師範大學 === 電信工程學研究所 === 106 === In this paper, we propose two different microwave structure design discussions; the first is a wideband ridge waveguide circulator design using multiple ferrite sheet, and the second is an orthogonal end-fire surface wave antenna.
The first circuit of this paper is designed to use a wideband ridge waveguide circulator design using multiple ferrite sheet. The operating frequency range is 5.1 - 11 GHz, while the S11 is less than -20 dB, and the insertion loss is above 0.5 dB. The isolation is less than -20 dB. Since the single-layer ferrite sheet has a bandwidth of 5 – 10 GHz, in order to increase its bandwidth, we have added three ferrite sheets of the same thickness into the waveguide, every two layer of Teflon is used as isolate in the middle of the disk. The use of a multiple ferrite sheet makes it wider than that of a single multiple ferrite sheet, and has an original frequency band and a loop effect.
The second circuit of this paper proposes an orthogonal end-emission surface wave antenna design with an operating frequency target of 9.8 – 11.5 GHz and S11 less than -10 dB. The target is a broadband antenna design and the radiation pattern of the antenna design is x and y. Directional radiation, using SMA joints to extend through the ground plane to the cavity between the parallel metal plates, placing an L-shaped metal patch, which is fed into the antenna body and radiated to the x and y directions. Generate orthogonal.
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