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Fabry-Pérot Resonator Antenna in Equivalent-Medium Metamaterials | IEEE Journals & Magazine | IEEE Xplore

Fabry-Pérot Resonator Antenna in Equivalent-Medium Metamaterials


Abstract:

In this communication, a wideband Fabry–Pérot resonator antenna (FPRA) is proposed. An optimized partially reflective surface (PRS) with a transverse permittivity gradien...Show More

Abstract:

In this communication, a wideband Fabry–Pérot resonator antenna (FPRA) is proposed. An optimized partially reflective surface (PRS) with a transverse permittivity gradient (TPG) composed of four nonrotationally symmetric sections is employed in the design of the antenna. The use of nonrotationally symmetric PRS results in more than 31% improvement of the 3 dB gain bandwidth compared with the traditional rotationally symmetric PRS. Furthermore, two types of nonresonant metamaterials (metallic-ring and etching-hole unit cells) are used to implement the equivalent permittivity of PRS. In this way, the equivalent permittivity value covers a broad range (3.5–9.5) for the same dielectric. As a result, the restrictions imposed by the use of only commercially available dielectrics and the errors that occur during the fabrication and assembly progress of different materials can be avoided. The primary radiator of FPRA is a double-ridge waveguide horn, which ensures wideband antenna operation. An FPRA prototype is fabricated and measured, which exhibits a broad bandwidth (5.2–11.5 GHz) with the return loss |S11| of less than −10 dB. The measured 3 dB gain bandwidth is 73.8% (in the frequency range of 5.3–11.5 GHz) with a peak gain of 17.1 dBi at 7.8 GHz.
Published in: IEEE Transactions on Antennas and Propagation ( Volume: 69, Issue: 11, November 2021)
Page(s): 7906 - 7911
Date of Publication: 05 May 2021

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I. Introduction

Fabry–Pérot resonator antennas (FPRAs) have been investigated for many years because of their capability to provide high directivity with a simple configuration. FPRAs usually consist of a primary radiator, such as a print-patch antenna or a waveguide horn, embedded inside a cavity between a partially reflective surface (PRS) and a metal ground plane [1]. The electromagnetic field, which is caused by multiple reflections inside the cavity, spreads from the center to the edges of the antenna. As a result, a higher directivity pattern in the broadside direction is produced than the directivity pattern produced by the primary feed. Different PRS types, i.e., multilayer superstrates [2]–[5], electromagnetic band-gap (EBG) structures [6]–[8], nonuniform metallic lattice [9], and metamaterial-based superstrates [10], [11], have been proposed in an attempt to enhance the antenna performance. Apart from the PRSs, specific ground planes, such as the curve ground plane [12], [13] and the metamaterial ground plane [14], have been proposed to enhance the performance of FPRAs in terms of wideband operation [12], beam-switch capability [13], and radar cross-section (RCS) reduction [14].

References

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