Abstract
In this paper, a tri-band printed monopole antenna with electrically coupled metamaterial units is proposed and investigated. The proposed antenna is designed to cover WLAN/WiMAX applications. The antenna consists of a printed strip line and two double metamaterial unit cells of different size placed near the monopole antenna on opposite sides. Each unit cell exhibits a negative permeability over the resonance frequency at 2.5 GHz and 3.62 GHz, which produces magnetic couplings with the monopole antenna. The proposed antenna structure was fabricated and measured. The measured -10 dB bandwidth for the return loss is from 2.47GHz-2.51GHz, 3.59GHz-3.69GHz, and 5.3GHz - 7.2 GHz, which are suitable for (WLAN: 2.4–2.484, 5.15–5.35, and 5.725–5.85 GHz) and (WiMAX: 2.5–2.69, 3.4–3.8, and 5.25–5.85 GHz) band Applications. By using the switches across the gap of proposed-MTM unit cell, the effect of this unit deactivated and its resonance frequency will disappear. Hence, the proposed antenna maintains the omnidirectional radiation pattern.
Highlights
In the development of wireless communication systems, a multiband antenna has great importance to cover several applications such as WIFI, Bluetooth and WLAN/WiMAX bands
Metamaterials have been implemented in the resonant antennas to achieve multi-band applications as well as to improve the radiation performances
Tow unit cells of the triangular shape of different sizes are placed near the monopole antenna to create three operating bands
Summary
In the development of wireless communication systems, a multiband antenna has great importance to cover several applications such as WIFI, Bluetooth and WLAN/WiMAX bands. Metamaterials have been implemented in the resonant antennas to achieve multi-band applications as well as to improve the radiation performances. Several works have been established on metamaterial loaded antennas[10, 11] making the metamaterial unit cell close to the radiating structure[11, 12]. The presence of the resonating structure improves the antenna radiation characteristics and optimizes the geometric dimensions so that we can obtain an electrically small antenna operating at wireless communication frequencies. The main purpose of this paper is to use a modified triangular form of metamaterial in order to design a multiband antenna. Tow unit cells of the triangular shape of different sizes are placed near the monopole antenna to create three operating bands. In the aim to more understand the behavior of the metamaterial, the (ON/ OFF) switches are used to study the frequency reconfiguration of the antenna
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