Abstract
A compact multiple-input-multiple-output (MIMO) microstrip antenna system covering the 2.4- and 5- GHz wireless local area network (WLAN) bands is presented in this paper. To achieve dual-band characteristic, the TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> and TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">03</sub> modes of a microstrip antenna are excited. A rectangular slot is etched in the center of microstrip antenna for improving the radiation capability of the TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">03</sub> mode. Then, two probes are utilized to tune the resonant frequency of the TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> mode with limited effect on the operating frequency of the TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">03</sub> mode. To realize high inter-port isolation at the two distinct WLAN bands in a methodological way, isolation enhancement is achieved successively at the lower and upper frequency bands. Two split loops are introduced to reduce the mutual coupling at the 2.4-GHz band. Two dipole elements are added in the rectangular slot to obtain high isolation at the 5-GHz band. The decoupling mechanism of the proposed antenna is detailed analyzed. The proposed antenna system operates at 2.25-2.63 GHz and at 5.14-6.06 GHz. The measured maximum value of mutual coupling between the two ports is less than -15.3 dB at both operating frequency bands.
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