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

Michael Forum Palvig; Peter Meincke; Erik Jørgensen; Olav Breinbjerg

doi:10.1109/TAP.2017.2781252

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

Michael Forum Palvig^*, Peter Meincke, Erik Jørgensen, Olav Breinbjerg

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

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.

Original language	English
Journal	I E E E Transactions on Antennas and Propagation
Volume	66
Issue number	2
Pages (from-to)	990 - 995
ISSN	0018-926X
DOIs	https://doi.org/10.1109/TAP.2017.2781252
Publication status	Published - 2017

Keywords

Coaxial aperture antennas
Cross polarization
Directional Coupler
Reflector antenna feeds

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

abstract = "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.",

keywords = "Coaxial aperture antennas, Cross polarization, Directional Coupler, Reflector antenna feeds",

author = "Palvig, {Michael Forum} and Peter Meincke and Erik J{\o}rgensen and Olav Breinbjerg",

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T1 - A Design Method for Mode-Selective Waveguide Couplers in Dual-Polarized Wideband Matched-Feed Antennas

AU - Palvig, Michael Forum

AU - Meincke, Peter

AU - Jørgensen, Erik

AU - Breinbjerg, Olav

PY - 2017

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AB - 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.

KW - Coaxial aperture antennas

KW - Cross polarization

KW - Directional Coupler

KW - Reflector antenna feeds

U2 - 10.1109/TAP.2017.2781252

DO - 10.1109/TAP.2017.2781252

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JF - I E E E Transactions on Antennas and Propagation

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