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In this paper, a grill-type leaky waveguide antenna with a high aperture efficiency and power handling capacity, even with an electrically short channel length, is proposed. To obtain the maximum aperture efficiency of the proposed antenna, variations in the antenna radiation performance were observed for the design parameters. The sidewall auxiliary structure design of the designed grille-type leaky waveguide antenna effectively increased the leakage amount to realize an aperture efficiency of 122 % for a single channel, even with an electrically short antenna length of 8 λ, and the 4-channel sectorial waveguide divider was combined to realize high antenna aperture efficiency and gain. In addition, the inside of the waveguide of the antenna designed to secure high power handling capacity is vacuum-sealed through an RF window, and the proposed antenna, through the field distribution analysis at triple points, including around the antenna, has a theoretical power processing capacity of 1.46 GW. The proposed antenna was fabricated, and its high aperture efficiency was experimentally verified through a near-field test. [ABSTRACT FROM AUTHOR]

In this study, an ultra-wideband cavity-backed four-arm sinuous antenna with low height and wide gain bandwidth is proposed. To reduce the antenna height, a feeding structure is applied with a coaxial bundle and two-port balun. In addition, a multi-layer radio absorber and metallic cavity are applied to obtain certain characteristics, such as a unidirectional radiation pattern, low profile, and stable reflection coefficient. Additionally, a radiator with low input impedance is applied for a wide gain bandwidth. The proposed antenna operates at 0.4～6.0 GHz and has a relatively low height and large gain bandwidth compared to the performance of previously studied antennas. [ABSTRACT FROM AUTHOR]