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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2018-05-21
Design of Terahertz Short-Slot Coupler with Curved Waveguide
By
Wu Pan,

    Dr. Wu Pan

    College of Photoelectronic Engineering

    Chongqing University of Posts and Telecommunications

    China

    Homepage

Hao Cheng,

    Mr. Hao Cheng

    College of Photoelectric Engineering

    Chongqing University of Posts and Telecommunications

    China

    Homepage

Xia Yin,

    Dr. Xia Yin

    College of Photoelectric Engineering

    Chongqing University of Posts and Telecommunications

    China

    Homepage

Xuan Li

    Dr. Xuan Li

    College of Photoelectric Engineering

    Chongqing University of Posts and Telecommunications

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 76, 27-32, 2018
doi:10.2528/PIERL18033001 | Google Scholar

Abstract
The design of a terahertz short-slot coupler with curved waveguide is proposed. A traditional short-slot coupler uses a step-like structure in order to suppress higher order modes and improve bandwidth. It becomes difficult to control the fabrication of tiny steps with the incensement of frequency especially in terahertz band. The designed coupler is composed of two curved waveguides overlapping in the middle to realize a specific coupling coefficient. Then the step-like structure can be replaced with a curved structure which is much easier to fabricate. The coupling coefficient of the coupler is 3 dB, and the variation is less than 1dB around the center frequency. The phase difference between two output ports is 90°. The isolation is greater than 10 dB in the whole working band. Measured results show high agreement with simulation predictions. The designed coupler can be widely used as feed networks of horn antenna array.
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Citation
Wu Pan, Hao Cheng, Xia Yin, and Xuan Li, "Design of Terahertz Short-Slot Coupler with Curved Waveguide," Progress In Electromagnetics Research Letters, Vol. 76, 27-32, 2018.
doi:10.2528/PIERL18033001
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