An UWB diversity antenna array with a novel H‐type decoupling structure

Abstract

This research work addresses the problem of mutual coupling between the antenna elements for ultra wideband diversity applications. A novel H‐type decoupling structure has been proposed which successfully suppresses the mutual coupling by 7 to 10 dB as compared to the nondecoupled radiating elements. The decoupling structure has been tested for shared and isolated ground planes. The isolation between the antennas was measured to be more than 25 dB in most of the band. The feasibility of the proposed structure in diversity applications has been analyzed by measuring the envelope correlation coefficient which was found out to be less than −30 dB. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2715–2720, 2013

A Compact Band-Notched Ultra-Wideband Spatial Diversity Antenna

“…Many studies have been carried out to design UWB diversity antennas [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. However, the impedance bandwidth of the antennas in [5][6][7][8] cannot cover the whole UWB, and the sizes of the antennas are relatively large in [5,[9][10][11][12][13][14][15][16][17] which are not suitable for some portable devices' applications.…”

“…However, the impedance bandwidth of the antennas in [5][6][7][8] cannot cover the whole UWB, and the sizes of the antennas are relatively large in [5,[9][10][11][12][13][14][15][16][17] which are not suitable for some portable devices' applications. On the other hand, the frequency range for UWB systems between 3.1 to 10.6 GHz will cause interference to the existing wireless communication systems, such as the wireless local area network (WLAN) for IEEE 802.11a operating in 5.15-5.825 GHz, so the UWB diversity antenna with a band-notched function is desired in the design.…”

“…On the other hand, the frequency range for UWB systems between 3.1 to 10.6 GHz will cause interference to the existing wireless communication systems, such as the wireless local area network (WLAN) for IEEE 802.11a operating in 5.15-5.825 GHz, so the UWB diversity antenna with a band-notched function is desired in the design. However, the antennas in [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] do not have the band-notched function to avoid the interference. Recently, some antennas with band-notched function have been reported [22][23][24][25][26][27].…”

MIMO application UWB antenna doublet incorporating a sinusoidal decoupling structure

“…The overall dimensions of the proposed 2 × 2 MIMO structure are W = 50.5 mm × L = 30 mm. A comparison of the proposed design with the designs reported recently reveals that there is considerable reduction in size achieved by the proposed design.…”

“…UWB system may be defined as any radio system that has the bandwidth larger than 25% of its center frequency or more than 500‐MHz bandwidth with reference to a voltage standing wave ratio (VSWR) of <2. UWB technology has significant potential for employability in radar, remote sensing, geo‐location, and more importantly wireless personal area networks (WPAN's) . Speeds of over 1 GB/s, low power usage and a low interference level are key features of UWB.…”