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- Title
Simulation-Based Approach to the Matching of a Dielectric-Filled Circular Waveguide Aperture.
- Authors
Xu, Songyuan; Heo, Jiwon; Ahn, Byoung-Kwon; Lee, Chan-Soo; Ahn, Bierng-Chearl
- Abstract
The circular waveguide aperture or open-end radiator, one of the canonical antenna elements, can be filled with a dielectric material for miniaturization. With dielectric filling, the aperture reflection increases and impedance matching is necessary. This paper presents a simple but innovative simulation-based approach to the aperture matching of a dielectric-filled circular waveguide aperture. By properly loading the aperture with two- or three-section dielectric rings, the impedance matching is possible over a wide frequency range starting slightly above the TE11-mode cutoff and continuing upward. The material for the aperture matching is the same as that filling the waveguide. The proposed matching structure is analyzed and optimized using a simulation tool for the dielectric constant εr of the filling material ranging from 1.8 to 10. For εr ≥ 5, the unmatched reflection coefficient ranges from −6.0 dB to −0.9 dB while the matched reflection coefficient is from −20.4 dB to −10.0 dB. The impedance matching has been achieved over more than an octave bandwidth.
- Subjects
DIELECTRIC waveguides; IMPEDANCE matching; DIELECTRIC materials; REFLECTANCE; FILLER materials; PERMITTIVITY
- Publication
Sensors (14248220), 2024, Vol 24, Issue 3, p841
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s24030841