Progress In Electromagnetics Research B
ISSN: 1937-6472
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By D. K. Naji

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This paper presents a new design approach for compact orthogonal broadband printed multiple-input multiple-output (MIMO) antennas based on a coplanar waveguide (CPW)-fed hexagonal-ring monopole antenna (HRMA) element. The design procedure of the basic radiating element is initiated from a stripline (SL)-fed circular monopole antenna (CMA). Then various antennas involved in the design evolution process are introduced to attain a compact CPW-fed HRMA. This basic antenna element has a compact size of 13×10 mm2, 50% smaller than SL-fed CMA, and a prototype of this antenna is built and tested. Based on HRMA element, compact two- and four-element MIMO antenna systems are designed, fabricated and experimentally demonstrated for 5-GHz ISM band operation. The MIMO antenna systems use orthogonally configured of identical closely spaced HRMA elements, with CPW-fed printed on one side of the substrate to achieve good isolation. Design simulation is carried out with the aid of Computer Simulation Technology Microwave Studio (CST MWS) and confirmed with High Frequency Structure Simulator (HFSS). The experimental results are in close agreement with the simulated ones, which validates the design principle. Based on experimental results, the two MIMO antenna systems have an impedance bandwidth of more than 2 GHz, good isolation of less than 15 dB, and a low envelope correlation coefficient of better than -26 dB across the frequency band of (4-6 GHz), which are suitable for 5-GHz MIMO applications.

D. K. Naji, "Design of a Compact Orthogonal Broadband Printed MIMO Antennas for 5-GHz ISM Band Operation," Progress In Electromagnetics Research B, Vol. 64, 47-62, 2015.

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