Hybrid metasurface loaded tri‐port compact antenna with gain enhancement and pattern diversity

Abstract

A tri‐port compact antenna loaded on hybrid metasurface (MS) with gain enhancement and pattern diversity is proposed in this article. The antenna consists of three analytically designed contorted radiators (Ant‐1, Ant‐2, and Ant‐3). A koch‐fed fractal aperture ground plane is used to improve impedance matching and port isolation, thus eliminating supplementary decoupling networks. Ant‐1 is 45° tilted, operating in wideband mode. Ant‐2 is one‐fourth, Ant‐3 is one‐half in electrical lengths with L‐shaped metallic contortions to achieve good matching characteristics and asserts pattern diversity. A hybrid MS (combination of conventional customized MS's) structure is loaded for gain enhancement of ≈ 8.93 dBi. Ant‐1 operates at (4.97‐10.63) GHz with 72.56% frequency bandwidth (FBW), Ant‐2 operates at (8.5‐10.4) GHz with 20.1% (FBW) and Ant‐3 operates at (7.2‐9.6) GHz with 28.57% (FBW). The differentiation in antenna electrical size assists compactness, reduction in mutual coupling (>17 dB), has uncorrelated radiation patterns at each port delivering far‐field diversity with low ECC < 0.1. A prototype antenna of size 28.6 mm × 28.6 mm is fabricated and experimented, which are in good agreements with EM simulation and equivalent circuit model response. The proposed tri‐port antenna can be a promising candidate for MIMO diversity applications.

Investigation of a high-gain and broadband circularly polarized monopole antenna for RF energyharvesting application

“…The proposed antenna has a peak gain variation from 7.5 to 8.5 dBi. It is also observed that, MTS layer has a better performance compared to earlier reported antennas in [5–37, 39, 40], and witness better reflection properties due to the presence of coupling effects [41] of inductance and capacitance, which control the fringing fields to be effectively coupled out with the radiated fields. Here, the radiation pattern at different frequencies is measured in the anechoic chamber and their plots are presented in Figs 5(a) and (b).…”

Dual‐polarized metasurface‐based monopole antenna design using characteristics mode theory for UHF RFID applications

“…48 Due to highdemand of UHF RFID applications toward automation, tracking, identification, security, logistics management, and so on, the antenna performance metrics like À10 dB impedance bandwidth (IBW), 3-dB axial ratio bandwidth (ARBW), and CP gain need to be enhanced for scalability. To understand insights about importance of CP, aimed to minimize polarization mismatch in between readers and tags; evaluation of characteristics mode analysis (CMA) [49][50][51][52][53][54][55] is performed, that help in predicting modal significance (MS), modal current, modal pattern, characteristics angle (φ n ), and eigen value (EV) for different antenna models. Comparison of performance analysis with the CP antennas [56][57][58][59][60][61][62][63][64][65][66][67][68][69] are reported in Tables 1 and 2.…”

“…As a result of which, it improves antenna coupling process and the radiation strength at the boresight direction is also improved, significant for UHF RFID applications. Here, characteristics mode theory (CMT) using CST microwave studio suite (CST-MWS) is implemented to study effective coupling modes, modal radiation patterns, [50][51][52][53][54] and interpret the insights behind the existence of CP behavior. 55 The analysis shows asymptotic nature at the CP band and symptotic above and beyond it.…”

Reconfigurable miniaturized UWB multiple‐input‐multiple‐output antenna system design and study using characteristics mode analysis

“…Firstly, compactness and low-profile in MIMO configuration can leverage spatial diversity, which can be achieved by localization and orientation of conducting elements to broadcast radiation diversity. 4 Secondly, isolating conducting elements increases signal throughput and reduces near-field mutual coupling. Thirdly, low Envelope channel coefficient (ECC) and diversity metrics to assert T X and R X of multiple data streams to improve wireless throughput.…”

“…Firstly, compactness and low‐profile in MIMO configuration can leverage spatial diversity, which can be achieved by localization and orientation of conducting elements to broadcast radiation diversity 4 . Secondly, isolating conducting elements increases signal throughput and reduces near‐field mutual coupling.…”