Abstract
This paper presents a new shape (s-shape monopole) of a super wideband antenna using stepped meander lines, a quarter waveguide transformer feeding line, and a defected ground structure (DGS). The antenna will be used for multiple wireless communication applications like WIMAX/WLAN/ISM/UWB, and also for several wireless communication applications. The total dimensions of the proposed antenna are 35 mm × 35 mm × 1.57 mm or 0.36 λo × 0.36 λo × 0.016 λo, which are the corresponding electrical dimensions with free-space wavelength (λo) at the lower operating frequency. The antenna is designed and simulated into two steps: the first (Antenna 1) covers a bandwidth of 18.2 GHz, while the second (Antenna 2, using DGS) covers a super wide bandwidth of 37.82 GHz (3.08–40.9 GHz). The measured fractional bandwidth and bandwidth ratio of the antenna are 174.68% and 13.009:1, respectively, which is operating from 3.09–40.2 GHz. The maximum calculated gain and efficiency are 5.9 dBi and 92.7%, respectively. The time-domain performance is good due to the calculation of the system fidelity factor, group delay, and its linear and constant phase variation.
Highlights
Monopole antennas are favored in wireless communication applications due to their wide bandwidth, small size, design simplicity, and ease of integration with the other devices [1]
This paper describes an S-shape stepped meander line monopole antenna with a defected ground structure which is capable of operating at a super-wide bandwidth
The antenna was simulated with the help of the commercial Finite-Integration Technique (FIT)
Summary
Monopole antennas are favored in wireless communication applications due to their wide bandwidth, small size, design simplicity, and ease of integration with the other devices [1]. In [24], a circular antenna using a waveguide transformer feeding line was presented It achieved a super wide bandwidth of 165.7% (2.7–28.8 GHz). A propeller shape was used by replacing the circular radiating shape of the monopole antenna to achieve a 168% (3–35 GHz), operating bandwidth [26]. This paper describes an S-shape stepped meander line monopole antenna with a defected ground structure which is capable of operating at a super-wide bandwidth. The simulated operating frequency of the antenna is from 3.08 GHz to above 40.9 GHz, and the measured frequency range is from 3.09 GHz to 40.2 GHz. A quarter waveguide transformer feeding line is used for best matching and to achieve a wide bandwidth. The structure of this paper is as follow: in Section 2, the design and configuration of the antenna is presented: Section 3 consists of a parametric study of the DGS slot; in Section 4, and antenna simulation and measurement results are discussed; Section 5 describes the time-domain performance of the antenna; Section 6 presents a comparison of the results of the proposed work with previous works; Section 7 presents the conclusion
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