A 330-GHz \text -Mode Radial Power Combiner With Nickel SSPPs Waveguide Terminations

This article presents a broadband and efficient TE _{\mathbf{11}} -mode radial power divider/combiner with a septum polarizer and a waveguide termination for terahertz power combination applications. In the design, a waveguide termination based on double nickel spoof surface plasmon polaritons (SSP...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2024-10, p.1-9
Main Authors: Zhang, Bo, Zhang, Yong, Xie, Xiaodong, Zhu, Huali, Xiao, Fei
Format: Article
Language:English
Subjects:
Circular polarization
Cutoff frequency
Electromagnetic waveguides
Frequency conversion
Loss measurement
Metals
Nickel
Power combiners
power divider
Power dividers
Probes
spoof surface plasmon polaritons (SSPPs)
terahertz radial combiner
waveguide termination
Waveguide transitions
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Summary:This article presents a broadband and efficient TE _{\mathbf{11}} -mode radial power divider/combiner with a septum polarizer and a waveguide termination for terahertz power combination applications. In the design, a waveguide termination based on double nickel spoof surface plasmon polaritons (SSPPs) is first developed to improve the polarizer performance. Benefit from the stopband reflection characteristics and high ohmic loss of nickel SSPPs, and the inherent 3-dB loss of a two-way power divider, the waveguide termination demonstrates an electromagnetic absorptivity of more than 98% within 260-375 GHz. Thereafter, a septum polarizer with integrated waveguide termination is proposed to generate the circularly polarized TE _{\mathbf{11}} ( \text{TE}_{11}^{\text{CP}} ) mode. By inserting the septum into the waveguide transition, the bandwidth is widened, and the compactness is improved. Furthermore, by shortening the interconnection length between the polarizer and the divider, the in-band TM _{\mathbf{01}} -mode resonance is reduced. In addition, parallel choke grooves are employed for the radial divider to reduce H -plane waveguide loss. The experimental results of the back-to-back radial combiner reveal that the return loss is greater than 16 dB, and the average insertion loss is 1.3 dB in the 280-380 GHz band, indicating a high combining efficiency of 86.1% and a wide bandwidth of 30.3%.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2024.3481233