A Dual-Slant-Polarized In-band Full-duplex (IBFD) Antenna System with Four Isolated Channels
- Publisher:
- IEEE
- Publication Type:
- Conference Proceeding
- Citation:
- 2023 17th European Conference on Antennas and Propagation (EuCAP), 2023, 00, pp. 1-5
- Issue Date:
- 2023-05-31
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| Filename | Description | Size | |||
|---|---|---|---|---|---|
| A Dual-Slant-Polarized In-band Full-duplex (IBFD) Antenna System with Four Isolated Channels.pdf | Accepted version | 12.98 MB |
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An in band full duplex IBFD antenna system having four ports with good self interference cancellation SIC is presented in this paper Two of the four ports provide 45 degree polarized radiation and the other two generate 45 degree polarized radiation To achieve high isolation between any two of the four ports three types of coupling need to be suppressed simultaneously which are the cross polarization coupling between the two ports of the same antenna the copolarization coupling between adjacent antennas and the cross polarization coupling between adjacent antennas The three types of couplings are defined as A type B type and C type coupling respectively In this work a novel isolation feed network is firstly proposed to deal with A coupling The isolation feed network also can differentially feed the antenna and achieve 45 degree polarizations without rotating the antenna Then the B and C couplings are also well suppressed in a double antenna system thanks to the extra defected ground structure DGS cross shaped walls and metal baffles The resultant isolation between any two of the four ports is 39 dB from 3 3 to 3 9 GHz The radiation patterns obtained by exciting the four ports are very similar to each other and are stable with frequency which makes the proposed antenna an excellent candidate for 5G sub 6 GHz IBFD applications
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