Abstract
In this paper, a wideband antenna was designed for super-wideband (SWB) applications. The proposed antenna was fed with a rectangular tapered microstrip feed line, which operated over a SWB frequency range (1.42 GHz to 50 GHz). The antenna was implemented at a compact size with electrical dimensions of 0.16 λ × 0.27 λ × 0.0047 λ mm3, where λ was with respect to the lowest resonance frequency. The proposed antenna prototype was fabricated on a F4B substrate, which had a permittivity of 2.65 and 1 mm thickness. The SWB antenna exhibited an impedance bandwidth of 189% and a bandwidth ratio of 35.2:1. Additionally, the proposed antenna design exhibited three band notch characteristics that were necessary to eradicate interference from WLAN, WiMAX, and X bands in the SWB range. One notch was achieved by etching an elliptical split ring resonator (ESRR) in the radiator and the other two notches were achieved by placing rectangular split ring resonators close to the signal line. The first notch was tuned by incorporating a varactor diode into the ESRR. The prototype was experimentally validated with, with notch and without notch characteristics for SWB applications. The experimental results showed good agreement with simulated results.
Highlights
In advanced wireless communication, the demand for super-wideband (SWB) antennas is on the rise
In [9], a compact SWB monopole antenna was designed with dimensions of 0.17 λ × 0.37 λ × 1.6 mm3
The single, dual, tri- and multiple notch characteristics have been achieved in the UWB frequency range (3.1 GHz–10.6 GHz)
Summary
The demand for super-wideband (SWB) antennas is on the rise. SWB antennas cover both long-range and short-range communication that includes the ultra-wideband (UWB) range For such applications, the monopole antenna is a good candidate owing to its low cost and ease of fabrication, but the comparatively large size of such an antenna is a major drawback. The shape of the antenna was fractal, providing band operation from 10 GHz to 50 GHz with low BDR and at a lower resonant frequency of 10 GHz. In [9], a compact SWB monopole antenna was designed with dimensions of 0.17 λ × 0.37 λ × 1.6 mm. The single, dual, tri- and multiple notch characteristics have been achieved in the UWB frequency range (3.1 GHz–10.6 GHz). The bandwidth performance of a trapezoid shape radiator, semicircular ground, and rectangular tapered feed line showed better bandwidth performance with the lowest resonance frequency of 1.42 GHz. In addition, three notch characteristics were achieved in the SWB range. A varactor diode was incorporated into the isolated area in the elliptical slot to make the center notch frequency tuned from 1.9 GHz to 2.5 GHz
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