Abstract
AbstractThe heptagonal‐shaped monopole antenna design for ultrawideband (UWB) applications is proposed. This antenna is designed on PCB FR4 substrate with relative permittivity ɛr = 4.4, loss tangent tan δ = 0.0245, and thickness h = 1.6 mm. The antenna consists of a radiated patch, a feed line, and a ground plane. With the different geometrical parameters, simulated and experimental results of the antenna are suitable for UWB operations. The bandwidth VSWR < 2 of the UWB antennas from measurement is ∼122.02% (2.63–10.86 GHz). To decrease the interference with the wireless local area networks (WLANs) at 5.2/5.8 GHz and worldwide interoperability for microwave access (WiMAX) at 3.5/5.5 GHz, two band‐notched filters covering from 3.4 to 3.69 and 5.15 to 5.85 GHz was design. Two L‐shaped slots on the patch and two slot‐type split ring resonators (SRRs) on the ground plane were used to produce two band‐notched frequency bands. The results for VSWR, far‐field H‐ and E‐plane radiation patterns and gain of the proposed antennas are presented and discussed. The radiation area of the design antenna is 26 × 16.38 mm2. The measured results show a good agreement with the simulated results.
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