Triband Compact Printed Antenna for 2.4/3.5/5 GHz WLAN/WiMAX Applications

Abstract

This research presents a triband compact printed antenna for WLAN and WiMAX applications. The antenna structure consists of a folded open stub, long and short L-shaped strips, and asymmetric trapezoid ground plane. Besides, it is of simple structure and operable in 2.4 GHz and 5 GHz (5.2/5.8 GHz) WLAN and 3.5/5.5 GHz WiMAX bands. The folded open stub and long and short L-shaped strips realize impedance matching at 2.4, 3.5, 5.2, and 5.8 GHz, and the asymmetric trapezoid ground plane fine-tunes impedance matching at 5.2, 5.5, and 5.8 GHz. In addition, the equivalent circuit model consolidated into lumped elements is also presented to explain its impedance matching characteristics. In this study, simulations were carried out, and a prototype antenna was fabricated and experimented. The simulation and experimental results are in good agreement. Specifically, the simulated and experimental radiation patterns are omnidirectional at 2.4, 3.5, and 5.2 GHz and near-omnidirectional at 5.5 and 5.8 GHz. Furthermore, the simulated and measured antenna gains are 1.269–3.074 dBi and 1.10–2.80 dBi, respectively. Essentially, the triband compact printed antenna covers 2.4 GHz and 5 GHz (5.2/5.8 GHz) WLAN and 3.5/5.5 GHz WiMAX frequency bands and thereby is a good candidate for WLAN/WiMAX applications.

Inverted L-Shaped CP Patch Antenna with Corner-Truncated Partial Ground Plane Diagonally Adjoined with Square Branch for L-Band Applications

“…To realize an AR below 3 dB (≤3 dB), a diagonally adjoining branch was integrated into the proposed antenna scheme as part of the partial ground plane. A transmission-line model was introduced to analyze a microstrip patch antenna using a series and parallel resonant circuit, where the bandwidth is given by Equations (2) and 3, respectively, and the resonant frequency can be calculated using Equation 4 [20]. Figure 5 shows the equivalent circuit model of the inverted L-shaped planar monopole antenna on a partial ground plane in vacuum and with the FR-4 substrate.…”

A Circular Sector With an Inverted L Shaped Monopole Antenna for Tri-Band Applications

“…Multiband monopole antennas have been designed using multiple branches in which each branch resonates over a different band [1][2][3][4][5][6]. The effective length of a branch is about λ/4 where λ is the wavelength corresponding to resonating frequency of that branch.…”

“…One or more branches are added to a branch to achieve multiple bands. Slot and slits are introduced in radiating element and ground plane to obtain the desired bandwidth [1][2][3][4][5][6]. A meander line branch is attached to a G shape monopole antenna to achieve tri-band operation [1].…”

A Compact Disc Shaped Microstrip Patch Antenna Using Inset Fed at 5GHz for Satellite Communications

“…Ground plane soldered with external conductor using co-pivotal and afterward the middle conductors are checked not to have cut off the ground plane. [6] Creator proposed triband minimized printed microstrip patch antenna that can be used for WiMAX& Wireless LAN applications. Microstrip patch antenna design comprises of collapsed open stub, asymmetric trapezoid ground structure plane, long and short Lformed strips.…”