A Robust Low-Profile, Electrically Small, Unidirectional Mixed-Multipole Antenna Integrated With a Ground Surface

Publisher:
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Publication Type:
Journal Article
Citation:
IEEE Antennas and Wireless Propagation Letters, 2024, 23, (1), pp. 364-368
Issue Date:
2024-01-01
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An innovative design of an electrically small, unidirectional mixed-multipole antenna (UMMA) compatible with a metal ground that has robust performance characteristics is developed for operation in the 915 MHz ISM-band. It incorporates both a ground-based magnetic near-field resonant parasitic (NFRP) element and a driven composite electric element. The magnetic NFRP element is integrated into the ground surface. This arrangement increases the insensitivity of the UMMA to its presence. A prototype was fabricated and tested. The measured results, in good agreement with their simulated values, demonstrate that the UMMA is electrically small (ka = 0.96) and low-profile (0.038λ0). The robustness of the design is demonstrated with it maintaining its attractive broadside unidirectional performance when the UMMA is positioned arbitrarily on the ground for different sizes of that metal surface. The prototype's measured fractional bandwidth, peak realized gain, front-to-back ratio, and overall efficiency values are, respectively, 1.09%, 3.54 dBi, 15.26 dB, and 70.1%. Along with its wide beamwidth and simple low-cost realization, these properties are appealing to a variety of space-limited, narrow band, and low-power terminal devices and their applications.
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