A decoupling method between two tri-band antennas for WLAN/WiMAX applications

Abstract

A decoupling method between two tri-band antennas for WLAN/WiMAX applications is presented. A monopole is first designed with tri-band characteristic; three resonating frequencies are generated by three separate resonators. Then, two tri-band monopoles are employed to develop a MIMO antenna system. The resonators of low band can reduce the mutual coupling for two higher bands by suppressing surface wave propagation. Finally, coupling reduction at low band is achieved by a Ω-shaped metal line to neutralize original coupling. The proposed MIMO antenna covers the 2.4/5.8 GHz WLAN and 3.5 GHz WiMAX bands, with the measured mutual coupling lower than −18 dB.

A Triple Band C-Shape Monopole Antenna for Vehicle Communication Application

“…Several microstrip-feed and CPW-feed printed monopole antennas that can support WLAN and WiMAX applications, while potentially applicable as V2X vehicle antenna, have been reported and well designed to meet a dual or triple band operation [16][17][18][19][20][21][22][23][24][25][26]. In [27], two open ended inverted L-shaped slots on the radiation patch have been designed, but the slot position and dimension were ambiguous, and the E-plane radiation pattern was uneven.…”

“…However, the antenna design suffers from limited space, the coupling between antennas, and shadowing of other radiation patterns due to a multitude of near-field effects. Also optimum positions are difficult to identify [8][9][10][11][12][13][14][15].Several microstrip-feed and CPW-feed printed monopole antennas that can support WLAN and WiMAX applications, while potentially applicable as V2X vehicle antenna, have been reported and well designed to meet a dual or triple band operation [16][17][18][19][20][21][22][23][24][25][26]. In [27], two open ended inverted L-shaped slots on the radiation patch have been designed, but the slot position and dimension were ambiguous, and the E-plane radiation pattern was uneven.…”

A butterfly-like slot UWB antenna with WLAN band-notch characteristics for MIMO applications

“…In [12,13,14,15], the antenna elements are placed in an orthogonal way, and polarization diversity technology is adopted to achieve natural isolation between antenna units. In addition, the isolation degree of antenna can be enhanced by introducing parasitic element [16,17,18,19], EBG structure [20] and decoupling network [21]. In this paper, we designed and fabricated a four cell MIMO antenna, where the unit isolation is realized by orthogonal layout, and its bandwidth meets the requirement of UWB.…”

Design of a miniaturized UWB MIMO Vivaldi antenna with dual band-rejected performance

“…Hence, many different structures have been carried out to reduce the mutual coupling of MIMO antennas. Low mutual coupling could be accomplished by placing an isolating metal strip between the two radiating elements [6,7], and symmetrical placements [8,9,10], placing perpendicularly or orthogonally [11,12,13,14], etching different kinds of slots on the ground [15,16,17,18], introducing a fence-type decoupling structure at the ground [19], using parasitic element between the antenna ports [20], etching complementary split ring resonator (CSRR) on the ground or loading SRR [21,22]. These effective methods mentioned above can improve the isolation obviously.…”