Wideband Printed MIMO/Diversity Monopole Antenna for WiFi/WiMAX Applications

Abstract

Abstract-A novel printed diversity monopole antenna is presented for WiFi/WiMAX applications. The antenna comprises two crescent shaped radiators placed symmetrically with respect to a defected ground plane and a neutralization lines is connected between them to achieve good impedance matching and low mutual coupling. Theoretical and experimental characteristics are illustrated for this antenna, which achieves an impedance bandwidth of 54.5% (over 2.4-4.2 GHz), with a reflection coefficient 10 dB and mutual coupling 17 dB. An acceptable agreement is obtained for the computed and measured gain, radiation patterns, envelope correlation coefficient, and channel capacity loss. These characteristics demonstrate that the proposed antenna is an attractive candidate for multiple-input multiple-output portable or mobile devices.Index Terms-Impedance bandwidth, monopole antenna, multiple-input multiple-output (MIMO), WiFi/WiMAX.

Compact and closely spaced tunable printed F‐slot multiple‐input–multiple‐output antenna system for portable wireless applications with efficient diversity

“…Attributes such as small size, low cost and ease of manufacture of printed monopole antennas motivate its application [2]. One advantage of the printed monopole antenna is the inherently omni-directional pattern for achieving maximum channel capacity [3]. Rapid developments in the use of MIMO systems in wireless communication demand novel antenna designs that can be used in more than one frequency band.…”

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

“…Correlation coefficient less than 0.0006 were achieved across entire band and meet up the requirement of diversity performances p e < 0.5 [17]. The simplified channel capacity loss of a 2x2 MIMO system can be calculated based on [3,18] …”

“…MIMO technology used multiple antennas at both receiving end of the system. Higher data rate and realibity can be achieved in rich scattering environment [1][2][3]. However, designing MIMO antenna in a finite space with wideband capability is a challenging task.…”

Compact Dual-Band Printed Diversity Antenna for Wimax/Wlan Applications

“…The neutralization line provides an anti-phase coupling current to eliminate the original coupling route. This can reduce the electromagnetic coupling between two closely placed antennas [15,20]. The vertical stub can be viewed as a reflector which can reduce the mutual coupling by separating the two antennas' radiation patterns [13,27].…”

“…By linking two planar inverted F antennas (PIFAs) with a suspended strip to cancel the reactive coupling, the isolation between them can be improved [14][15][16]. Then, this method is further used on a printed microstrip antenna array for mobile applications [17][18][19][20]. High port isolation can also be achieved by etching slits or slots on the ground plane [21][22][23][24][25].…”