Analytical modelling of waveguide mode launchers for matched feed reflector systems

Palvig, Michael Forum; Breinbjerg, Olav; Michaleas, Peter; Jørgensen, Erik

doi:10.1109/aps.2016.7696379

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…The φ-variation of a mode coupling is a product of the field variation for the input and output mode. The resulting φ-dependence of the desired and the most critical undesired couplings are listed in Table II. With this information, we can select a number of hole positions, such that the combined contributions from all holes will cancel out undesired couplings [27]. Additionally, the two desired couplings should be of approximately the same strength and the hole positions must be separated a certain distance such that they do not overlap for a certain hole size.…”

Section: Azimuthal Hole Distributionmentioning

confidence: 99%

A Design Method for Mode-Selective Waveguide Couplers in Dual-Polarized Wideband Matched-Feed Antennas

Palvig

Michaleas

Jørgensen

et al. 2018

IEEE Trans. Antennas Propagat.

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A novel type of multihole directional coupler is presented as well as a design method involving novel procedures. The device couples two orthogonal TE11 modes in a circular waveguide into two orthogonal TE21 modes with specified excitations in a surrounding coaxial waveguide, which has the circular waveguide as inner conductor. A simple, novel analytical procedure is used to determine azimuthal hole positions, such that each of the input modes couples to only the desired coaxial TE21 mode. The method is applied to a specific coupler which is designed to couple −14 dB to both higher-order coaxial modes in the band from 10 GHz to 14 GHz. The suppression of undesired modes is generally better than 40 dB. The coupler is intended for broadband, dual-polarized matched feeds, which are able to compensate the intrinsically high cross polarization of offset single reflector antenna systems.

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Section: Azimuthal Hole Distributionmentioning

confidence: 99%