Design and Analysis of a Novel Miniaturized Dual-Band Omnidirectional Antenna for Wifi Applications

Abstract

In this article, a novel dual-band omnidirectional antenna for WiFi applications is presented and investigated. The proposed antenna is mainly composed of two pairs of half-wavelength dipoles with different lengths. It is fed by a microstrip balun, which provides a good impedance matching for desired dual-band operation. The dimension of the proposed antenna is only 50 mm × 10 mm × 1 mm (0.4λ 0 × 0.08λ 0 × 0.008λ 0 , and λ 0 is the wavelength of 2.4 GHz). The performance study of this dualband omnidirectional antenna with different geometric parameters has been conducted. The final design is fabricated and measured, and the results exhibit a good impedance bandwidth of approximately 19.2% for |S 11 | ≤ −10 dB ranging from 2.24 to 2.70 GHz centered at 2.4 GHz, and over 17.4% for |S 11 | ≤ −10 dB ranging from 4.73 to 5.6 GHz centered at 5.0 GHz. This antenna also has a stable gain of 2.09 ∼ 2.87 dBi and omnidirectional radiation patterns over the whole operating band. Dual-band coverage, stable omnidirectional radiation performance, simple structure, and miniaturized dimension make this antenna an excellent candidate for WiFi applications.

Wideband CPW-Fed Oval-Shaped Monopole Antenna for Wi-Fi5 and Wi-Fi6 Applications

“…3. The proposed antenna is very thin and can be used in next-generation wireless devices (with slim characteristics) as it has less thickness (low in profile) than [1][2][3][4][6][7][8][9][10][11]]. 4.…”

“…Several antenna design techniques that exhibit multiband or wideband operations have been reported in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] for wireless applications. Amid these designs, dielectric resonator antennas (DRAs) are very popular as they offer high dielectric strength and no inherent conductor loss, which results in better radiation efficiency.…”

“…In [3], CSR has been applied to achieve multiband operations across the (842-947 MHz), (2.3-2.46 GHz), and (4.98-5.16 GHz) bands. To further achieve small sizes with omnidirectional patterns, a half-wave dipole fed by microstrip balun that has dimensions of 50 × 10 × 1 mm 3 operating in the WiFi bands of (2.24-2.7 GHz) and (4.73-5.6 GHz) has been studies in [4]. To realize a flexible antenna for UMTS (1.9 GHz) and WiMAX (5.8 GHz) applications, Reference [5] has reported a flexible paper based printed antenna having dimensions of 35 × 30 mm 2 .…”

“…To achieve very small dimensions of 17.5 × 8 mm 2 , Reference [6] has presented a simple multifrequency monopole antenna operating in 2.4 GHz, 3.3 GHz, and 5.8 GHz bands. Notably, the antenna designs reported in [1][2][3][4][5][6] do not cover the complete Wi-Fi 5 bands. Even though the patch antenna design in [7] has a size of 34.6 × 33.05 × 1.57 mm 3 and can cover the entire Wi-Fi 5 band, the design has used an expensive Roger substrate to fabricate the antenna.…”

Design and Characterization of a Compact Four-Element Microstrip Array Antenna for WiFi-5/6 Routers

“…It varies from 67% to 82%. The authors in [24] proposed another dual-band antenna operating at 2.4 and 5 GHz. The antenna's bandwidth ranges from 2.24 GHz to 2.70 GHz when operating at 2.4 GHz and from 4.73 GHz to 5.6 GHz when operating at 5.0 GHz.…”