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.
Highlights
Recent decades have witnessed increased adoption of wireless communications technologies in a wide variety of applications, including laptop computers, mobile phones, and portable devices. e phenomenon contributes to a rise in demand for compact multiband antennas.In [1,2,3,4,5], dual-band antennas covering 2.4/5.2/5.8 GHz bands were proposed for wireless local area network (WLAN) applications
In [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24], attempts were made to develop antennas for WLAN/WiMAX applications, including π-shaped slotted microstrip antennas with aperture-coupled feed [6], resonator antennas [7,8,9], dual and multipolarized antennas [10,11,12], magnetoelectric and magnetic dipole antennas [13, 14], frequency-reconfigurable antennas using PIN-diode switch [15,16,17,18], metamaterial antennas [19,20,21], antennas with inverted-L-shaped radiating elements and parasitic elements in the ground plane [22], antennas with pentagonal ring slot fed at the vertex and E-slip with backfeeding [23], and antenna with bow-tie slot in a single metal sheet on top of the flexible substrate [24]
These antennas could cover 2.4/ 5.2/5.8 GHz WLAN and 3.5/5.5 GHz WiMAX bands, they suffer from bulkiness and fabrication complexity
Summary
Recent decades have witnessed increased adoption of wireless communications technologies in a wide variety of applications, including laptop computers, mobile phones, and portable devices. e phenomenon contributes to a rise in demand for compact multiband antennas.In [1,2,3,4,5], dual-band antennas covering 2.4/5.2/5.8 GHz bands were proposed for wireless local area network (WLAN) applications. In [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24], attempts were made to develop antennas for WLAN/WiMAX applications, including π-shaped slotted microstrip antennas with aperture-coupled feed [6], resonator antennas [7,8,9], dual and multipolarized antennas [10,11,12], magnetoelectric and magnetic dipole antennas [13, 14], frequency-reconfigurable antennas using PIN-diode switch [15,16,17,18], metamaterial antennas [19,20,21], antennas with inverted-L-shaped radiating elements and parasitic elements in the ground plane [22], antennas with pentagonal ring slot fed at the vertex and E-slip with backfeeding [23], and antenna with bow-tie slot in a single metal sheet on top of the flexible substrate [24] These antennas fail to cover the entire WLAN frequency band (2.4/5.2/5.8 GHz).
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