Dual-Band Dual-Polarized Compact Log-Periodic Dipole Array for MIMO WLAN Applications

Abstract

A compact dual-band dual-polarized log-periodic dipole array with a dimension of 160×160×60 mm 3 for MIMO WLAN applications is proposed. In this antenna, there are 12 antennas,six for horizontal polarization and six for vertical polarization.In order to achieve dual linear polarizations and beam switching ,six horizontal antennas are placed in sequential, rotating arrangement on a horizontal substrate panel with an equal inclination angle of 60 o to form a symmetrical structure, while the other six antennas for vertical polarization are inserted through slots made on the horizontal substrate panel. Futhermore, six pairs of double T-type slits are introduced to mainly reduce the mutual coupling between the horizontal antennas.The proposed array is manufactured and exhibits the characteristics of high isolation, good front-to-back ratio,and average gains of 5 and 6 dBi over the 2.4 and 5 GHz ban d,respectively.The MIMO performance of the array is analyzed and evaluated by mutual coupling and the envelope correlation coefficient.

Compact planar frequency reconfigurable multiple‐input‐multiple‐output antenna with pattern and polarization diversity characteristics for WiFi and WiMAX standards

“…Recently, several MIMO antenna designs have been reported in the literature for dual‐band WLAN applications and some have been reported for dual‐band WiMAX applications . In these reported papers, some of the designs have nonplanar structure and are not suitable for compact planar portable devices. Only a few dual‐band MIMO antenna designs are feasible to deploy in compact USB dongle .…”

“…3 However, accommodating more bands in the same antenna makes the antenna design challenging task. 4,5 Recently, several MIMO antenna designs have been reported in the literature for dual-band WLAN applications [6][7][8][9][10][11][12][13][14][15][16][17][18][19] and some have been reported for dual-band WiMAX applications. 17,[20][21][22][23][24] In these reported papers, some of the designs have nonplanar structure 15,17,18,24 and are not suitable for compact planar portable devices.…”

A compact CPW‐fed UWB antenna with quadruple rejected bands

“…Great enthusiasm of designing UWB antennas has been aroused since the unlicensed frequency band of 3.1 to 10.6 GHz was allocated for commercial UWB systems by the federal communications commission (FCC) in 2002 . The reason is that wideband and dual‐ or multiband characteristics play a very important role in modern wireless communication systems . However, there are many challenges in designing an UWB antenna with high performance.…”

Tri-band and quad-band dual L-slot coupled circularly polarized dielectric resonator antennas

“…A triple band antenna element with three identical antennas symmetric on the substrate, etched parasitic slot on ground plane and isolated using metal‐vias‐cavity is presented for WLAN applications . A small dual‐polarized dual‐band log‐periodic dipole array of 12 elements are proposed for MIMO and WLAN applications . Setting up dual bands and significant extension of impedance bandwidth, by utilizing radiating rectangular slot excited by strip line feed is reported by Buerkle et al Along with rectangular shaped slots, other shapes like annular‐ring and U‐shaped apertures are used to feed CDRAs to obtain wide impedance bandwidth.…”

“…5 A small dual-polarized dual-band log-periodic dipole array of 12 elements are proposed for MIMO and WLAN applications. 6 Setting up dual bands and significant extension of impedance bandwidth, by utilizing radiating rectangular slot excited by strip line feed is reported by Buerkle et al 7 Along with rectangular shaped slots, other shapes like annular-ring 8 and U-shaped apertures 9 are used to feed CDRAs to obtain wide impedance bandwidth. A CDRA embedded with the ring DRA excited by slot-coupling to get over 50% of impedance bandwidth.…”