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Cutoff manipulation of anisotropic reactance lining in circular waveguides

Published online by Cambridge University Press:  03 December 2018

Zhangjie Luo Open the ORCID record for Zhangjie Luo [Opens in a new window] ,
Tie Jun Cui  and
Hui Feng Ma
Zhangjie Luo*
Affiliation:
State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China
Tie Jun Cui
Affiliation:
State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China
Hui Feng Ma
Affiliation:
State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China
*
Author for correspondence: Zhangjie Luo, E-mail: zhangjie_luo_cn@126.com
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Abstract

The control of cutoffs is of great interest in designs of circular waveguides. In this paper, this topic is investigated for pure transverse-electric (TE) and transverse-magnetic (TM) modes by taking advantage of anisotropic reactance lining loadings. It is found that the cutoffs of TE and TM modes are determined by the reactance in the azimuthal and axial directions, respectively. When the reactance values are positive, the cutoff frequencies are lower than those of a normal conducting waveguide with the same cross-section. However, in contrast to the claim made in the previous literature that the negative reactance values caused the same reducing effect on the cutoffs as the positive values did, the cutoffs are found to be increased by the negative reactances. The theoretical results are validated by the simulations using commercial software, where a delicate model with an approximate curved anisotropic impedance boundary is proposed for the first time. By lowering the TE cutoffs and raising the TM ones, some intriguing applications, such as single-mode bandwidth extension and degenerate mode avoidance, are predicted, which would pave a way for designs of novel waveguide devices.

Keywords

Circular waveguidecutoff frequencyanisotropic reactance boundarysingle-mode bandwidthmode degeneration avoidance
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 11 , Issue 4 , May 2019 , pp. 334 - 340
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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