Ahead of Print article · Journal article
A Design Method for Mode-Selective Waveguide Couplers in Dual-Polarized Wideband Matched-Feed Antennas
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.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2017 |
| Pages: | 990-995 |
| ISSN: | 15582221 and 0018926x |
| Types: | Ahead of Print article and Journal article |
| DOI: | 10.1109/TAP.2017.2781252 |
| ORCIDs: | Palvig, Michael Forum and Breinbjerg, Olav |
Antenna feeds Bandwidth Broadband antennas Couplers Couplings Cutoff frequency antenna feeds antenna radiation patterns broadband antennas circular waveguide circular waveguides coaxial waveguides cross polarization directional coupler directional couplers dual-polarized wideband matched-feed antennas electromagnetic wave polarisation frequency 10.0 GHz to 14.0 GHz mode-selective waveguide couplers multihole directional coupler offset single reflector antenna systems reflector antenna feeds reflector antennas surrounding coaxial waveguide
