Coaxial‐to‐circular waveguide transition with broadband mode‐free operation

Bang, Jaehoon; Ahn, Bierng-Chearl

doi:10.1049/el.2014.2667

Cited by 10 publications

(12 citation statements)

References 5 publications

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“…The design is connected to the probe at one side and the other side is short circuited with the bottom wall of the waveguide. The optimised transition has the upper side tapered, a design feature commonly used to achieve wideband impedance transformers 5 . In addition, we may interpret the conductivity-free region at the lower side as a wideband matching stub.…”

Section: Resultsmentioning

confidence: 99%

“…Currently, it is possible to design transitions using full-wave numerical solutions to Maxwell’s equations 4 . However, most of the proposed transitions still depend essentially on the concept of heuristically cascading various transmission line sections 5 6 7 8 , with only few parameters to optimise. The complexity involved in assembling various sections, especially when 3D structures are used, can complicate mass producibility.…”

mentioning

confidence: 99%

“…We emphasise that in this approach, the operational principle, which will turn out to be a radiating lump, possibly together with a back reflector for the side-launcher, or a tapered structure for the end-launcher is not prescribed. The current approach produces simple-shaped transitions with wideband performance that classical design methods indeed can match, but with much more complexity in their design 5 6 .…”

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confidence: 99%

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Topology Optimisation of Wideband Coaxial-to-Waveguide Transitions

Hassan

Noreland

Wadbro

et al. 2017

Sci Rep

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To maximize the matching between a coaxial cable and rectangular waveguides, we present a computational topology optimisation approach that decides for each point in a given domain whether to hold a good conductor or a good dielectric. The conductivity is determined by a gradient-based optimisation method that relies on finite-difference time-domain solutions to the 3D Maxwell’s equations. Unlike previously reported results in the literature for this kind of problems, our design algorithm can efficiently handle tens of thousands of design variables that can allow novel conceptual waveguide designs. We demonstrate the effectiveness of the approach by presenting optimised transitions with reflection coefficients lower than −15 dB over more than a 60% bandwidth, both for right-angle and end-launcher configurations. The performance of the proposed transitions is cross-verified with a commercial software, and one design case is validated experimentally.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Topology Optimisation of Wideband Coaxial-to-Waveguide Transitions

Hassan

Noreland

Wadbro

et al. 2017

Sci Rep

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“…Using multistage impedance transformer to achieve bandwidth extension was a common way [10,11], while the multistage can also be approximated as a cone to realize the same purpose [12]. It is mentioned that such a transition can be orthogonal between the coaxial line and the circular waveguide [13,14]. In this work, an X-band transition from the coaxial line to circular waveguide with TEM mode to TM 01 mode is studied.…”

Section: Introductionmentioning

confidence: 99%

An in-line coaxial-to-circular waveguide transition at X band

Xia

et al. 2020

Journal of Electrical Engineering

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A wideband transition from the coaxial TEM mode to the TM01 mode of the circular waveguide with in-line input-output architecture is proposed in this paper. The transition employs multi-stage stepped impedance transformer to achieve wideband responses. Both mode transition and impedance matching characteristics are discussed in the paper. A demonstrator is developed and validated experimentally. As compared with some recently published reports, a better performance is observed. Moreover, the developed transition could facilitate the mechanical fabrication more easily. It can be found wide applications such as the circular waveguide based slot array antenna, the nondestructive detection, cracks inside the conductive pipes, and so on.

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“…원형도파관은 반사경 안테나 피드, 직교모드변환기, 편파기, 필터/ 멀티플렉서, 로터리 조인트 등의 구현에 널리 사용 되고 있다 [1]- [4]. 원형도파관을 송신기 또는 수신기 에 연결하기 원형도파관-동축선 변환부가 요구되며 기존 연구결과로서 단순한 동축선 프로브를 이용한 구조(동작범위 2.3~2.7GHz) [5], 이중 리지를 이용한 구조(동작범위 0.83~2.8GHz) [6], 단순 동축선 프로브 를 이용한 구조(동작범위 8.8~10.9GHz) [7], 원뿔 프 로브와 사각형-원형도파관 변환부를 이용한 구조(동 작범위 7.34~17.77GHz) [8] 등이 발표되었다. 사각도 파관-동축선 변환부에 많은 연구 결과가 발표되었 으며 도파관이 동작하는 전 주파수 대역에서 동작 하는 변환부의 설계가 가능하다.…”

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