Abstract
AbstractA compact conventional phone antenna integrated with wideband multiple‐input‐multiple‐output (MIMO) antenna is presented.Within operation band of the MIMO antenna, the effect of mutual coupling between the conventional phone antenna and the MIMO antenna is reduced by etching three slits into the ground plane, and this slits also can relieve the impedance matching degradation caused by the mutual coupling between the conventional phone antenna and the MIMO antenna. A wideband T‐shaped neutralization line without effect on the performance of conventional phone antenna is applied to enhance the isolation for the two MIMO antenna elements. Therefore, high isolation is achieved within the operation band of the MIMO antenna. The two operation bands of the convention phone antenna with VSWR ≤ 3 are 0.89–0.96 GHz and 1.71–2.18 GHz, respectively, and the operation band of the MIMO antenna with VSWR ≤ 1.7 and isolation ≥ 20 dB is 2.4–3.7 GHz. Moreover, the conventional phone antenna has good omnidirectional radiation patterns in H‐plane, and the MIMO antenna has back‐radiation patterns for diversity gain. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1958–1962, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26930
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