A Left-Handed Waveguide Transmission Structure Based on Open-Short-Circuit Cylindrical Dielectric Resonators

Abstract

The invention discloses a left-handed waveguide transmission structure based on an open-short cylindrical dielectric resonator, which mainly includes an input connection device, an output connection device, a waveguide unit and a cylindrical dielectric resonator unit; the equivalent negative dielectric constant of the waveguide filling medium can be realized And the equivalent negative magnetic permeability, so as to realize the left-handed transmission characteristics of the waveguide. It has the characteristics of multiple resonance modes, easy assembly, stable transmission characteristics, and high resonance quality factor. The height of the resonator can be flexibly selected according to the needs, and the size is flexible. advantage.

Description

technical field [0001] The invention relates to a left-handed transmission structure, in particular to a left-handed waveguide transmission structure, which belongs to the field of microwave transmission. Background technique [0002] With the rapid development of microwave systems, people put forward higher requirements on the loss and phase shift performance of waveguide transmission structures. In the classic waveguide transmission structure, since the dielectric constant and magnetic permeability of the filled transmission medium in the waveguide are not less than 1, when the electromagnetic wave is transmitted in the waveguide, the phase always lags along the transmission direction (ie: right-handed transmission characteristics) , with the rapid development of microwave components and systems, the demand for waveguide phase shift characteristics (ie: left-handed transmission characteristics) is gradually increasing. How to realize the negative permittivity and negative...

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Problems solved by technology

[0003] In 2000, D.R.Smith et al. used a metal strip and metal ring structure to achieve negative permittivity and negative magnetic permeability for the first time; in 2009, Zhiyu Wang et al. proposed an open-short circuit metal strip structure, which can not only realize negative dielectric constant, and the structure is simpler; however, due to the dense metal intervention, the medium loss based on the metal structure is large, the transmission efficiency is low, and it is difficult to meet the needs of signal transmission in actual engineering. Therefore, in recent years, more research institutions will Focus on the all-dielectric resonant structure

[0004] The all-dielectric resonant structure made of high dielectric constant and low loss dielectric material can overcome the disadvantage of large loss of metal resonant structure. In 2008, A.Ahmadi et al. proposed to make small balls and long cylinders with high dielectric constant dielectric material and dielectric resonators, which constitute resonant units respectively, and realize left-handed characteristics in the free space transmission mode; Q.Zhao et al. have studied the resonant structures of long cylinders and square columns, and verified the structure through the processing and testing of the opposite columns. Left-handed transmission characteristics; since the above structure is applied in free space, and the support medium is required to maintain its spatial distribution position, the additional influence introduced by the support medium cannot be avoided, and the transmission loss of the guide increases, and the structure introducing the support medium also increases the production and Assembly complexity

[0005] O.Acher et al. loaded the cylindrical dielectric resonator on the bottom edge of the flat plate transmission line, and verified that the structure has left-handed transmission characteristics by testing the reflection coefficient, but did not discuss whether the structure is effective in the waveguide transmission mode; 2014 Bai Du et al. proposed a left-handed transmission structure in which the resonant structure is loaded in the waveguide. The structure uses a dielectric square column as the resonant unit and is loaded on the wide side of the waveguide to realize the left-handed transmission characteristics of the waveguide. However, the structure uses two ends A resonant structure that combines open circuit and short circuit at both ends. For the open circuit structure at both ends, it is required to use a support medium to fix the resonant unit in the middle of the waveguide so that it does not contact the metal waveguide wall. Therefore, the structure will also be affected by the support medium. In addition , the two-short end circuit structure of this structure requires the dielectric square pillar to be closely combined with the top and bottom of the waveguide at the same time, and the slight size error will directly affect the dielectric vibration performance of the dielectric square pillar. Therefore, the height of the dielectric square pillar of this structure must be the same as the waveguide The height is the same, which reduces the flexibility of the resonance unit design, and the assembly difficulty of the structure is also high

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