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- Title
Cross Polar Reduction of a High Gain Wide-Band Stacked Microstrip Antenna Using Metasurfaces.
- Authors
Rochkari, Anjali; Verulkar, Shubhangi; Chaskar, Nayana; Trimukhe, Mahadu; Gupta, Rajiv
- Abstract
In this article, a low-profile high gain stack microstrip antenna (MSA) with low Cross Polarization Level (CPL) using multiple meta-surfaces is proposed. MSA on a thick substrate having low dielectric constant enhances the gain and bandwidth (BW). However, as substrate thickness increases, the CPL increases due to the increase in coaxial probe length used for feeding MSA. The CPL is reduced by using metasurfaces formed by an array of square metallic patches of dimensions and periodicity < 0.1λ0. A suspended MSA (SMSA) is designed on a reactive impedance surface (RIS) backed substrate, to reduce the interaction between substrate and ground plane, surface waves and to increase impedance BW and polarization purity. A parasitic patch is fabricated on a superstrate and placed above the SMSA and metallic patches forming the metasurfaces are fabricated around the MSA, parasitic patch (PP) and on the other side of superstrate. These metasurfaces increase the inductance of the antenna, and to compensate the inductance, the height of SMSA and the spacing between MSA and PP are decreased which results in the decrease in probe feed length and CPL. This novel low-profile high gain wide band stack MSA offers CPL < -20 dB, Side Lobe Level (SLL) < -20 dB, Front to Back lobe ratio (F/B) > 20 dB, and S11 ≤ -10 dB over 3.3-3.6 GHz to cover 5G applications. The 0.935λ0 × 0.99λ0 × 0.046λ0 prototype antenna offers peak gain of 8.3 dBi, antenna efficiency > 90%, and λ0 being the free-space wavelength at 3.3 GHz.
- Subjects
STANDARD metropolitan statistical areas; ANTENNAS (Electronics); PERMITTIVITY; SURFACE impedance; ELECTRIC inductance
- Publication
Progress in Electromagnetics Research Letters, 2024, Vol 119, p91
- ISSN
1937-6480
- Publication type
Article
- DOI
10.2528/PIERL24032501