Two-Way Waveguide Diplexer and Its Application to Diplexing In-Band Full-Duplex Antenna
- Publisher:
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Publication Type:
- Journal Article
- Citation:
- IEEE Transactions on Microwave Theory and Techniques, 2022, PP, (99)
- Issue Date:
- 2022-01-01
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Filename | Description | Size | |||
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Two-Way_Waveguide_Diplexer_and_Its_Application_to_Diplexing_In-Band_Full-Duplex_Antenna.pdf | Published version | 9.13 MB |
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A design of a diplexing in-band full-duplex (IBFD) slot antenna based on the quadruple-mode resonator (QMR) is presented for the first time. First, a two-way waveguide diplexer integration using QMR is designed. Four waveguide modes, namely, TE $_{011}$ , TE $_{101}$ , TM $_{\mathrm{210,}}$ and TM $_{120}$ , are primarily used. These four modes are modal orthogonal to each other in a single QMR. Each of the quadruple modes can be independently manipulated with low mutual interference with other modes. Taking advantage of this characteristic, a two-way waveguide diplexer integration can be implemented with four independent frequency channels. In each diplexer, the downlink channel is dominated by fundamental mode TE $_{011}$ /TE $_{101}$ , while the uplink channel is dominated by high-order mode TM $_{210}$ /TM $_{120}$ . By cascading QMRs, higher order frequency responses are achieved with expected coupling coefficient ( $K)$ and external quality factor ( $Q_{{\text{e}}})$ . Based on the proposed two-way diplexer concept, a diplexing IBFD antenna with a turnstile junction is designed by replacing the inputs with a cross-coupled radiating slot. It integrates the filtering, diplexing, orthomode transducing, and radiating functions into a single element. Four channels can work independently to transmit/receive two orthogonal signals. The two-way waveguide diplexer and diplexing IBFD waveguide antenna with a second-order response were implemented and tested for the proof-of-concept.
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