volume | PIER Journals

2024-01-09

Compact and Broadband CPW-to-RWG Transition Using Resonator with Impedance-Matching Element

Ir-Ving Tseng,

Dr. Ir-Ving Tseng

National Taiwan University of Science and Technology

Taiwan

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Ming-Feng Zheng,

Dr. Ming-Feng Zheng

National Taiwan University of Science and Technology

Taiwan

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Ting-Tzu Cho,

Ms. Ting-Tzu Cho

National Taiwan University of Science and Technology

Taiwan

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Chun-Long Wang

Prof. Chun-Long Wang

Department of Electronic and Computer Engineering

National Taiwan University of Science and Technology

Taiwan

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Progress In Electromagnetics Research Letters, Vol. 116, 71-78, 2024

doi:10.2528/PIERL23101303 | Google Scholar

Abstract

This paper proposes a compact and broadband coplanar waveguide (CPW)-to-rectangular waveguide (RWG) transition using a resonator with an impedance-matching element. The transition size is as small as 7.66 mm, and the frequency range for which the reflection coefficient is smaller than -15 dB covers from 8.05 GHz to 12.18 GHz (FBW = 40.83%), almost encompassing the full X-band (8.2-12.4 GHz). To reduce the size of the transition, a short-circuited stub phase shifter is used to replace the half-wavelength phase shifter, resulting in a miniaturized CPW-to-RWG transition using the resonator with the impedance-matching element. The transition size is further reduced from 7.7 mm to 5.9 mm. Besides, the frequency range for which the reflection coefficient is smaller than -15 dB covers from 8.05 GHz to 12.38 GHz (FBW = 42.38%), nearly encompassing the full X-band (8.2-12.4 GHz) as usual. To verify the simulation results, both CPW-to-RWG transitions using the resonator with the impedance-matching element are fabricated and measured. The simulation and measurement results are in reasonable agreement.

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Ir-Ving Tseng, Ming-Feng Zheng, Ting-Tzu Cho, and Chun-Long Wang, "Compact and Broadband CPW-to-RWG Transition Using Resonator with Impedance-Matching Element," Progress In Electromagnetics Research Letters, Vol. 116, 71-78, 2024.
doi:10.2528/PIERL23101303

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