Abstract
A new meta-surface structure (MSS) with a near-zero refractive index (NZRI) is proposed to enhance the performance of a square loop antenna array. The main challenge to improve the antenna performance is increment of the overall antenna volume that is mitigated by assimilating the planar NZRI MSS at the back of the antenna structure. The proposed NZRI MSS-loaded CPW-fed (Co-Planar Waveguide) four-element array antenna is designed on ceramic-bioplastic-ceramic sandwich substrate using high-frequency structure simulator (HFSS), a finite-element-method-based simulation tool. The gain and directivity of the antenna are significantly enhanced by incorporating the NZRI MSS with a 7 × 6 set of elements at the back of the antenna structure. Measurement results show that the maximum gains of the antenna increased from 6.21 dBi to 8.25 dBi, from 6.52 dBi to 9.05 dBi and from 10.54 dBi to 12.15 dBi in the first, second and third bands, respectively. The effect of the slot configuration in the ground plane on the reflection coefficient of the antenna was analyzed and optimized. The overall performance makes the proposed antenna appropriate for UHFFM (Ultra High Frequency Frequency Modulation) telemetry-based space applications as well as mobile satellite, microwave radiometry and radio astronomy applications.
Highlights
In recent years, engineered materials have been used in antenna technology by several researchers.After a pioneering investigation of numerous properties of artificial materials with negative permittivity and permeability, substantial research attention has been turned to the use of meta-surfaces [1,2]
We propose the design and experimental analysis of a near-zero refractive index (NZRI) meta-surface structure (MSS)-backed CPW-fed
The proposed CPW-fed patch antenna is composed of a 2 × 2 square loop element array on 2 mm thick ceramic-filled bioplastic high-permittivity dielectric material substrate backed by a 7 × 6 set of NZRI MSS and a slotted ground plane
Summary
In recent years, engineered materials have been used in antenna technology by several researchers.After a pioneering investigation of numerous properties of artificial materials with negative permittivity and permeability, substantial research attention has been turned to the use of meta-surfaces [1,2]. In recent years, engineered materials have been used in antenna technology by several researchers. One of the potential applications of meta-materials or meta-surfaces is enhancement of antenna performance [3,4]. Micro-strip patch antennas have become quite popular due such attractive features as low cost, light weight, low profile, design simplicity and easy manufacturability [5]. These low-profile patch antennas suffer from low gain and directivity, which limit the range of applications. Several researchers have proposed numerous techniques to improve the gain and directivity of these antennas in recent decades
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