A compact tri-band antenna incorporated with a split ring resonator array is proposed for Wireless Local Area Network (WLAN) and Worldwide interoperability for microwave access (WiMAX) applications. The proposed antenna is printed on an FR4 substrate with overall dimensions of 0.25λ × 0.29λ at the lowest frequency. Impedance bandwidth of the antenna is optimised by introducing slots on the top of the patch. The ground plane is engineered by placement of a split ring resonators array to induce additional resonance due to occurance of magnetic dipole moment. The antenna resonates at the frequencies of 2.4 GHz, 3.5 GHz & 5.5 GHz having bandwidths of 12.5%, 7.42% and 6.36% with the gains of 2.25 dBi, 3.72 dBi and 2.71 dBi, respectively which matches well with the fabricated results. The proposed antenna shows omnidirectional radiation pattern which makes it appropriate for WLAN and WiMAX applications.
A low-profile, tri-band, wide slot antenna for the Wireless Local Area Network (WLAN) and World-Wide Interoperability for Microwave Access (WiMAX) applications is proposed in this article. The surface dimension of the proposed planar antenna is 0.32λ Â 0.32λ mm 2 (lowest operating frequency). The antenna structure consists of a wide slot which is formed by carefully etching out the square and circular shapes from the basic patch antenna. The standard cost-effective FR-4 substrate with a thickness of 1.6 mm is used for the fabrication of the prototype. Tri-band resonance at 2.4, 3.5, and 5.5 GHz is achieved with the peak gain of 3.33, 1.12, and 1.37 dBi, respectively. The impedance bandwidth at three resonant peaks is 15.36%, 11.7%, and 8.29% with Voltage Standing Wave Ratio (VSWR) well below the requirement of 1.5. Dipoleshaped radiation patterns, average gain > 1.96 dBi, and efficiency of 83% make the antenna commercially viable for use in WLAN and WiMAX devices.
A four-port dielectric resonator (DR)-based multiple-input multiple-output (MIMO) antenna is presented for sub-6 GHz MIMO communication. The dielectric resonator was fed through aperture feeding to achieve dual-band resonance. The DRA has the operating modes of and at 3.3 GHz and 3.9 GHz, respectively. The engineered antenna has port isolation of higher than 20 dB at the target frequencies without the employment of an extra isolation mechanism. Full-wave high-frequency simulation software was employed for the simulation computation. The antenna has a peak gain of 5.8 dBi and 6.2 dBi, and an efficiency of 88.6% and 90.2% at 3.3 GHz and 3.9 GHz, respectively. The proposed resonator has good MIMO diversity parameters. The optimal envelope correlation coefficient (ECC) is 0.01, channel capacity loss (CCL) is 0.1 bits/sec/Hz, and the total active reflection coefficient (TARC) is −22.46. The DRA elements are aligned orthogonally with adequate displacement for achieving polarization diversity and spatial diversity. The antenna delivers its applications in Sub-6 GHz 5G and WiMAX communications.
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