Abstract
A surface wave exciter adapting to different-diameter lines for single power line communications is proposed in this article. A side-feeding structure is designed which enables surface wave communication on existing power lines without any damage. The proposed surface wave exciter is mainly composed of a horn, two symmetrical feeding structures, a separable feeding ring, and a separable short-circuit metal ring. In order to avoid high order modes caused by insufficient excitation of side-feeding structure, two-port feeding structure is proposed. Meanwhile, the impedance matching of the exciter is improved. The exciter is designed to adapt to several lines with different diameters by using the separable feeding ring and short-circuit metal ring. Two prototypes for the proposed design are fabricated and tested. The measured results indicated that the input reflection coefficients ( S11) are less than −10 dB and the efficiencies are better than 30% in the Sub-6 GHz wireless communications. Moreover, a single power line communication system, which uses surface wave to transmit signal, is set up and tested. The transmission loss and the throughput are investigated to further prove the reliability of single power line surface wave communications.
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