Open AccessMiniaturised triple‐band antenna loaded with complementary concentric closed ring resonators with asymmetric coplanar waveguide‐fed based on epsilon negative transmission line
Author(s) -
Kumar Rajkishor,
Singh Reshma,
Chaudhary Raghvendra Kumar
Publication year - 2018
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5164
Subject(s) - coplanar waveguide , ground plane , resonator , transmission line , impedance matching , optics , antenna (radio) , physics , resonance (particle physics) , electrical impedance , telecommunications , microwave , engineering , atomic physics , quantum mechanics
This study presents an open‐ended triple‐band miniaturised metamaterial (MTM) inspired antenna based on the epsilon negative‐transmission line (ENG‐TL). The zeroth‐order resonance (ZOR) and first‐order resonance (FOR) characteristics are implemented using the ENG‐TL theory. The proposed MTM antenna consists of rectangular and square‐shaped complementary concentric closed ring resonator (CCCRR) in the left and right half of the asymmetric coplanar waveguide (CPW) ground plane, respectively. The CCCRR generates an extra coupling capacitance and inductance, which help for improving the gain at ZOR mode and better impedance matching at higher‐order mode. The resonance characteristic of the antenna is controlled by the shunt elements due to its open‐ended boundary condition. The proposed triple‐band MTM antenna offers measured −10 dB impedance bandwidths of 8.54% (1.12–1.22 GHz), 10.25% (2.22–2.46 GHz) and 35.75% (2.94–4.22 GHz). All these three bands show good impedance matching with appropriate gain and high radiation efficiency and also having an omnidirectional pattern in the xz‐ plane and dipolar type pattern in the yz ‐plane. The designed antenna shows an overall dimension of 0.11 λ 0 × 0.11 λ 0 × 0.006 λ 0 at ZOR frequency (1.16 GHz).