학술논문
Nonuniform Modulated Holographic Antenna With Wide Gain Bandwidth and Scanning Angle
Document Type
Periodical
Source
IEEE Antennas and Wireless Propagation Letters Antennas Wirel. Propag. Lett. Antennas and Wireless Propagation Letters, IEEE. 23(5):1603-1607 May, 2024
Subject
Language
ISSN
1536-1225
1548-5757
1548-5757
Abstract
The holographic antenna is an impedance-modulated periodic leaky-wave antenna. The radiation efficiency is higher in the region closer to the feed because of uneven leaky-wave radiations and thus limits the overall aperture efficiency. To alleviate this issue, this paper proposes a nonuniform proportional impedance modulation method. By employing directional-fed topology and controlling the leakage rate in different regions on the aperture surface, the aperture efficiency is significantly improved without sacrificing bandwidth. To validate the proposed idea, a reflector-based scalar holographic antenna is analyzed, simulated and experimentally validated. The measurement results show 3 dB gain bandwidth of 49% within 14.8–24.4 GHz and a maximum aperture efficiency of 27.5%. Moreover, the beam scanning range is 5°–61° within the 3 dB gain bandwidth. The proposed method is promising to realize a holographic antenna with wide bandwidth, high aperture efficiency, and planar integration simultaneously.