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 |
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Journal | I E E E Transactions on Antennas and Propagation |
Volume | 66 |
Issue number | 2 |
Pages (from-to) | 990 - 995 |
ISSN | 0018-926X |
DOIs | |
Publication status | Published - 2017 |
Keywords
- Coaxial aperture antennas
- Cross polarization
- Directional Coupler
- Reflector antenna feeds