Abstract
This work presents a new and efficient approach for enhancing the bandwidth and reducing the E-plane cross-polarization (X-pol) of an epsilon negative transmission line (ENG-TL) antenna with reduced size for working in 2.4 GHz Industrial, Scientific and Medical (ISM) band. The antenna consists of ENG-TL on which a curved meander line inductor is loaded for the generation of zeroth-order resonance mode. Subsequently, a miniaturized and low profile (0.06 λ0 × 0.06 λ0 × 0.013 λ0 at 2.44 GHz) circular-complementary split-ring resonator (C-CSRR) based mushroom meta-resonator is stacked over the ENG-TL antenna enhances the bandwidth twice without increasing any additional area. The proposed antenna provides a radiating element size of 0.17λ0 × 0.15λ0 excluding the feedline and total antenna dimension including ground plane is 0.17λ0 × 0.20λ0 × 0.025λ0 at 2.45 GHz. The measured results shows an enhanced impedance bandwidth (IBW) of 7.40%, an acceptable gain of 2.8 dBi, and X-pol value better than 35 dB is obtained for the E-plane. The antenna compactness, extended IBW, low X-pol levels, improved gain, high gain-to-area ratio, and acceptable radiation efficiency indicates that the proposed antenna is appropriate for working in 2.4 GHz (2.4–2.484 GHz) ISM band.
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