Closely Spaced Dual Band-Notched Uwb Antenna for Mimo Applications

Abstract

Abstract-A closely spaced dual-band notched UWB MIMO antenna is proposed in this paper. A traditional semi-circular monopole with ultra-wideband operation is chosen as an element of the proposed MIMO antenna. When two of the UWB monopoles are put together closely, the mutual coupling between them is apparently strong. To reduce the coupling between the antenna elements, a T-shaped branch is inserted between them, which reduces the mutual coupling obviously over the entire operating band. Also, the T-shaped branch can perform as a compensating radiator which can lower the operating frequencies of the proposed antenna. In order to achieve dual band-notched characteristics, meandering slots are cut in the patches, and symmetrical C-shape strips are nearly placed to the monopoles' feed-lines. The meandering slot is for lower band notch (WiMAX, GHz) while the C-shape strips are for upper band (WLAN, 5.15-5.825 GHz). The measured radiation efficiencies, peak gains and radiation patterns are illustrated and show good agreement as anticipated.

Compact Uwb Mimo Antenna With Acs-Fed Structure

“…Comparisons of the proposed antenna with those presented in [4][5][6][7][8][9][10][11] on antenna dimensions are given in Table 1. Significant reduction in size has been achieved with our antenna design.…”

“…Moreover, the bandwidth ratio of |S 21 | < −20 dB/UWB bandwidth is 64%, ranking in the middle among Refs. [4][5][6][7][8][9][10][11], which means that the proposed antenna has a good isolation performance. …”

Compact Wlan Band-Notched Printed Ultrawideband Mimo Antenna With Polarization Diversity

“…As key components of UWB systems, wideband and high-isolation characteristics are required for UWB diversity antennas, which have been studied widely in recent years, in particular etching a ring slot on the ground plane [5], extending a tree-like structure [6] and inserting stubs [7] between the two radiating elements to weaken the mutual coupling. Parasitic elements were also inserted between the elements to improve the isolation at a given frequency [8].…”

A compact orthogonal wideband printed mimo antenna for WiFi/WLAN/LTE applications

“…In recent years, several methods in enhancing the isolation of the MIMO antenna have been reported [5][6][7][8][9][10][11][12][13][14]. Techniques such as neutralization line [5,6], stub [7][8][9][10], the position of the antenna elements [11], the EBG structure [12], slots on the ground plane [13] and using separated semicircular monopoles [14] have been utilized.…”

“…Techniques such as neutralization line [5,6], stub [7][8][9][10], the position of the antenna elements [11], the EBG structure [12], slots on the ground plane [13] and using separated semicircular monopoles [14] have been utilized. By reviewing existing methods in [5][6][7][8][9][10][11][12][13][14], it is noticed that low mutual coupling with dual band performances can be achieved, but large in size.…”