Investigation of thick coax-to-waveguide transitions

Tako, N.; Levine, E.; Kabilo, G.; Matzner, H.

doi:10.1109/eucap.2014.6901909

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…We use the finite-difference time-domain (FDTD) method (Taflove and Hagness 2005) to numerically solve the governing equations (1)-(4). The computational domain is discretized by a uniform cubical Yee grid, where the conductivity is located at the edges.…”

Section: Governing Equations and Discretizationmentioning

confidence: 99%

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Topology optimization of compact wideband coaxial-to-waveguide transitions with minimum-size control

Hassan

Wadbro

Hägg

et al. 2017

Struct Multidisc Optim

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This paper presents a density-based topology optimization approach to design compact wideband coaxialto-waveguide transitions. The underlying optimization problem shows a strong self penalization towards binary solutions, which entails mesh-dependent designs that generally exhibit poor performance. To address the self penalization issue, we develop a filtering approach that consists of two phases. The first phase aims to relax the self penalization by using a sequence of linear filters. The second phase relies on nonlinear filters and aims to obtain binary solutions and to impose minimum-size control on the final design. We present results for optimizing compact transitions between a 50-Ohm coaxial cable and a standard WR90 waveguide operating in the X-band (8-12 GHz).

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Section: Governing Equations and Discretizationmentioning

confidence: 99%

“…However, wideband transitions typically include complex, bulky 3D structures that can be complicated to mass produce (Yi et al 2011;Bang and Ahn 2014;Tako et al 2014). Simeoni et al (2006) proposed a compact type of coaxial-to-rectangular waveguide transitions that is suitable for mass production by using printed circuit board technology.…”

Section: Introductionmentioning

confidence: 99%

Topology optimization of compact wideband coaxial-to-waveguide transitions with minimum-size control

Hassan

Wadbro

Hägg

et al. 2017

Struct Multidisc Optim

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“…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%

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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Investigation of thick coax-to-waveguide transitions

Cited by 2 publications

References 3 publications

Topology optimization of compact wideband coaxial-to-waveguide transitions with minimum-size control

Topology optimization of compact wideband coaxial-to-waveguide transitions with minimum-size control

Topology Optimisation of Wideband Coaxial-to-Waveguide Transitions

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