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A beam scanning Fabry‐Pérot cavity antenna (FPCA) for 28 GHz‐band is presented in this article. The proposed antenna consists of a slot‐fed patch antenna and several layers of perforated superstrates with different dielectric constant. The beam of the antenna can be controlled by moving the superstrate over the antenna. By increasing the offset between the feeding antenna and the superstrate, a larger tilt angle can be obtained. The size of the antenna is 0.95λ0 × 0.95λ0 × 0.48λ0 at 28.5 GHz. The results show the proposed antenna achieves an impedance bandwidth (S11 < ‐10 dB) of 10.5% (27.2‐30.2 GHz), and the beam can be scanned from 0° to 14° in the yoz‐plane with the offset changed from 0 mm to 2 mm. The gain of the antenna is enhanced by 5 dBi in comparison with the feeding antenna without the superstrate, which ranges from 10.91 to 11.53 dBi with the different offset. The proposed antenna is fabricated and shows a good agreement with simulated result.

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 (S 11 ) 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. K E Y W O R D S power line, power line communications, surface wave, surface wave exciter

A dual‐band dual‐polarized shared‐aperture antenna with suppression of cross‐band scattering for base station application is presented in this article. The proposed antenna consists of a lower‐frequency‐band (LFB) antenna and two 1 × 3 higher‐frequency‐band (HFB) arrays. The LFB antenna is designed with a novel configuration. Some chokes composed of inductive and capacitive elements are introduced for scattering current suppression of the cross‐band, which is the main reason for the deterioration of the radiation pattern of the HFB arrays. The measured results show that the LFB antenna with the operating frequency of 690–960 MHz and the HFB antenna with the operating frequency of 1710–2170 MHz achieve stable radiation characteristics in their respective bandwidth.