Miniaturized broadband‐multiband planar antenna with a symmetric quarter‐circular ground plane for WLAN/WiMAX standards

Abstract

In this paper, a novel design of miniature and broadband‐multiband coplanar waveguide‐fed planar antenna with a symmetric quarter‐circular ground plane is suggested to realize multiband with better performance. The experimental results show that the suggested antenna has achieved two bandwidths (S11 < −10 dB): the lower band from 2.34 to 2.42 GHz centered around the resonant frequency of 2.38 GHz and the upper broadband from 3.16 to 6.57 GHz resonating at 3.5 and 5.38 GHz, respectively. The bandwidths cover the two required bands: WiMAX and WLAN at the frequencies 3.5/5.5 and 2.4/5.2/5.8 GHz, respectively. All these three resonant frequencies show better impedance matching with convenient gain and high radiation efficiency; moreover, the radiation patterns in the H‐plane and E‐plane are omnidirectional and bidirectional, respectively. The patch antenna prototype is constructed on a simple substrate named FR4 epoxy and having total dimensions of 0.23λ × 0.14λ × 0.012λ, as λ is the free‐space wavelength at the lower resonant frequency. In addition, the resulting multiband antenna is a highly compact size and having a good performance, which makes it appropriate for wireless systems in diverse applications.

Analysis and Design of a High Gain Multiband Antenna Based on Metamaterials for RFID Applications

“…Indeed, slots have attracted much attention. In ref [1], a three-band antenna with circular slot technology is proposed for WLAN/WiMAX communication. By using this technique, the antenna has achieved significant impedance matching at all three resonant frequencies.…”

A Miniaturized Wide-Band Antenna Based on the Epsilon Negative Transmission Line for Wireless Communication Devices

“…Thus, in order to design a multiband and broadband antenna that suitable the WLAN and WiMAX applications, various techniques have been proposed in the literature such as fractal antenna [6] and introducing slots on the radiating element or the fed line of the antenna [7]. The asymmetric coplanar waveguide is employed to former the antenna components because it achieves more design freedom compared with conventional coplanar waveguide and also helps to improve the bandwidth of the antenna [8].…”

A Miniaturized CPW-Fed Reconfigurable Antenna with a Single-Dual Band and an Asymmetric Ground Plane for Switchable Band Wireless Applications

“…Several compact planar antennas with a slot have been proposed in the literature; hexagon-slot, u-slot, and circularslot patch antennas have triple-band of operations [7,8]; these antennas have a miniature structure however are could not reconfigurable to choose the operation band. Moreover, various structures of the reconfigurable antenna are presented in literature and a rectangular patch is a current structure.…”