Broadband waveguide-to-coax transitions

Wheeler, Gershon J.

doi:10.1109/irecon.1957.1150581

Cited by 11 publications

(4 citation statements)

References 2 publications

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“…The in-line coaxial-to-waveguide transition has been proposed since the 1960s [20] and it has been employed to feed open-waveguide arrays [21]. The L-shaped coaxial configurations [22,23] are a first common technique to short the launcher, but a folded conductor is a challenging task, especially in mm-wave technology, and it is overcome by patch antenna launchers [24] or by shorting the launcher directly on a tapered ridge or multi-section one quarter wavelength-length transformer ridges, which allow the matching over a wide bandwidth [25,26].…”

Section: Introductionmentioning

confidence: 99%

An In-Line Coaxial-to-Waveguide Transition for Q-Band Single-Feed-Per-Beam Antenna Systems

et al. 2021

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An in-line transition between a coaxial cable and rectangular waveguide operating in Q-band (33–50 GHz) is presented. The aim of the work is to minimize the modifications in the waveguide to the strictly necessary to overcome the manufacturing issues due to the high frequencies involved. In addition, the transition is compact and it does not increase the space occupation on the transverse section, this suggests its application in horn antennas clusters arrangement. The operating principle consists of both a modal conversion and an impedance matching between the devices. The modal conversion is realized in an intermediate region, where the coaxial penetrates in the waveguide: the device geometry is designed so that the electric field in the transition is a trade-off between the TEM mode of the coaxial and the TE10 of the guide. A shaped waveguide backshort and a reactive air gap in the coaxial cable co-participate to achieve the matching. An optimized Chebyshev stepped transformer completes the transition to fulfil the impedance mismatch with the full waveguide. The design issues and technological aspects are considered. The influences of the feeding pin misalignment, the presence of groove is included in the analysis and these practical aspects are discussed and numerically validated via the scattering parameters analysis of the proposed design. The return loss is higher than 25 dB over the whole Q-band.

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Section: Introductionmentioning

confidence: 99%

An In-Line Coaxial-to-Waveguide Transition for Q-Band Single-Feed-Per-Beam Antenna Systems

et al. 2021

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“…Posts that slide through slots in the broad wall are also used for adjusting the impedance of the waveguide section of interest to improve matching [5]. Wheeler reported the first loop transition in 1957 [6]. Later on the loop type end feed was adapted for a multimode phase array element [7].…”

Section: Introductionmentioning

confidence: 99%

A Loop-Type End-Launcher for Carbon Fiber Reinforced Polymer Waveguides

Bojovschi¹,

Gray²,

Ghorbani³

2013

PIER M

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The analysis of an end-launcher type transition from coaxial to WR90 waveguides is presented. This transition is tuned to have the highest performance at the radar frequency of 9.375 GHz. The characteristics of the transducer are investigated comparatively in 30 cm aluminum and carbon fiber reinforced polymer waveguides. The advantage of the proposed feed is that it does not require grounding to the broad wall of the waveguide compared to the traditional endlauncher loop feeds. This departure from the current loop feeds makes the proposed feed suitable for carbon fiber reinforced polymer waveguides where a disruption in the broad wall would be undesirable.

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“…Such changes in the spectral signals from the water surface should be measurable with satellite optical sensors [2,3], but chlorophyll-a was mapped in the 1970s [4]. Up until now, the digital evaluation of remotely sensed data at visible and nearinfrared (IR) wavelengths has been used to estimate major water quality parameters.…”

Section: Introductionmentioning

confidence: 99%

CAD of coaxially end‐fed waveguide phased‐array antennas

Galdi

Gerini

Guglielmi

et al. 2002

Micro & Optical Tech Letters

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An alternative configuration for an infinite coaxially end- fed waveguide phased-array antenna is explored. In the proposed con- figuration, the integration of the end-fed launcher and the output waveguide, rather than the waveguide in itself, acts as a basic radiator. This allows the design of more compact antenna elements. In order to analyze and optimize the structure, an accurate full-wave simulation tool based on the multimode admittance matrix representation is developed. Results are validated against state-of-the-art commercial CAD software. Numerical simulations involving singly and doubly tuned con- figurations are presented and discussed to illustrate the potential convenience of the proposed configuration and of the CAD tool developed

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Broadband waveguide-to-coax transitions

Cited by 11 publications

References 2 publications

An In-Line Coaxial-to-Waveguide Transition for Q-Band Single-Feed-Per-Beam Antenna Systems

An In-Line Coaxial-to-Waveguide Transition for Q-Band Single-Feed-Per-Beam Antenna Systems

A Loop-Type End-Launcher for Carbon Fiber Reinforced Polymer Waveguides

CAD of coaxially end‐fed waveguide phased‐array antennas

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