Abstract
The paper presents a highly efficient, low cost, ultra-wideband, microstrip monopole antenna for microwave imaging and wireless communications applications. A new structure (z-shape, ultra-wideband (UWB) monopole) is designed, which consists of stepped meander lines to achieve super-wide bandwidth and high efficiency. Three steps are used to design the proposed structure for the purpose to achieve high efficiency and wide bandwidth. The antenna bandwidth is enhanced by varying the length of meander line slots, optimization of the feeding line and with the miniaturization of the ground width. The simulated and measured frequency bands are 2.7–22.5 GHz and 2.8–22.7 GHz (156% fractional bandwidth), respectively. The dimensions of the antenna are 38 mm × 35 mm × 1.57 mm, and its corresponding electrical size is 2.41 λg × 2.22 λg × 0.09 λg, where guided wavelength λg is at the center frequency (12.75 GHz). This antenna achieved a high bandwidth ratio (8.33:1). The realized gain is varying from 1.6–6.4 dBi, while that of efficiency is 70% to 93% for the whole band. Radiation patterns are measured at four operating frequencies. It has an acceptable group delay, fidelity factor, and phase variation results that satisfy the limit of ultra-wideband in the form of the time domain.
Highlights
The frequency range of 3.1 GHz to 10.6 GHz band was allocated by federal communication commission (FCC) in 2002 for ultra-wideband application, which is well-known for both antenna designers and ultra-wideband (UWB) systems [1]
This paper presents a simple z-shaped meander monopole antenna having high efficiency and super ultra-wide bandwidth
H-fields main lobe is in the ‘y-axis’ direction which has end-fire characteristics and nearly Omni-directional. Due to this special characteristic, the antenna is most attractive in microwave imaging and for communication application
Summary
The frequency range of 3.1 GHz to 10.6 GHz band was allocated by federal communication commission (FCC) in 2002 for ultra-wideband application, which is well-known for both antenna designers and ultra-wideband (UWB) systems [1]. Multiple antennas installation is difficult due to the limited space within the compact wireless terminal. To solve these problems, researchers designed many novel antennas in the last few years just like reconfigurable antennas [2,3], UWB antennas [4], and multiband antennas. In UWB communication, a compact UWB planar monopole antenna for multiple applications is established. During the last few years, many researchers across the globe have been designed
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