Dual‐band planar antenna loaded with CRLH unit cell for WLAN/WiMAX application

Abstract

A dual‐band planar antenna based on composite right and left handed (CRLH) metamaterial is presented. The proposed antenna is comprised of a host folded planar monopole antenna and a CRLH transmission line unit cell. Due to another resonance frequency generated from the loaded CRLH unit cell, the presented antenna is actually a planar antenna with dual resonance bands at the centre frequency of 2.50 and 5.80 GHz, respectively, which can be regulated independently. The developed antenna also has different polarisations, the linear polarisation at the lower band and the circular polarisation at the upper resonance band. Rather than the complicated structure as before, this antenna is fabricated easily for the simple configuration without holes and the interdigital capacitances. The results of this study show that the reflection coefficient and radiation pattern have a good agreement between the simulation and measurement, the simulated relative bandwidth is 22.8% (2.22–2.79 GHz) and 10.8% (5.42–6.04 GHz), which meet the Wi‐Fi/Worldwide Interoperability for Microwave Access (WiMAX) specification very well.

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

“…A triangular-shaped strip was incorporated into the existing ground plane to realize the asymmetric trapezoid ground plane (the proposed antenna) to fine-tune impedance matching at the upper frequency band, i.e., 5.2, 5.5, and 5.8 GHz. [10] 40 × 30 × 0.79 2.4/5.8 2.5/5.5 [11] 50 × 50 × 1.6 2.1 3.5/5.5 [12] 35 × 45 × 1.5 2.4/5.8 2.3/3.5/5.5 [13] 80 × 65 × 0.78 2.4 2.5/3.5 [14] 40 × 40 × 0.764 5.8 3.5 [15] 30 × 20 × 0.8 2.45/5.7 3.5 [16] 50 × 45 × 1.6 2.4/5.8 3.5 [17] 59 × 31 × 0.1 2.4 3.5 [18] 45 × 50 × 1 2.4 3.5/5.5 [19] 70 × 44 × In the parametric study of the antenna, the dimensions of a folded open stub, long and short L-shaped strips, and asymmetric trapezoid ground plane were varied and the reflection coefficient (|S 11 |) was determined, as shown in Sections 3.2 and 3.3.…”

“…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]. However, these antennas fail to cover the entire WLAN frequency band (2.4/5.2/5.8 GHz).…”

Miniature Slotted Semi-Circular Dual-Band Antenna for WiMAX and WLAN Applications

“…Due to their interesting features, metamaterials have been reported by researchers for antenna miniaturization and multiband applications. For instance, a folded monopole dual-band antenna [21] consisting of a composite right-and left-handed metamaterial was proposed for 2.5-and 5.8-GHz center frequencies (from the normal strip and a single metamaterial cell, respectively), which can be controlled independently by varying their geometrical parameters. Although the above techniques have achieved remarkable success in designing antennas with the potential for operating within multiple frequency bands, most of these antennas have large dimensions or a complex structure, or they are difficult to manufacture.…”

Low-Profile Mimo Antenna Arrays With Left-Handed Metamaterial Structures for Multiband Operation

“…In open literature, many researchers have used CRLH metamaterials to design different planar antennas geometries, characterised by miniaturized structures and multifunctionality operation [20][21][22][23][24][25][26][27][28][29][30][31]. These designs depend on the unique feature of metamaterials of exhibiting zero or negative progressive phase values at arbitrary frequencies, which allow antennas to resonate at zeroth-order mode (n = 0) or negative-order modes (n = −1, −2, .…”