Design of a Compact Orthogonal Broadband Printed Mimo Antennas for 5-GHZ Ism Band Operation

Abstract

Abstract-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 hexagonalring 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 mm 2 , 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.

4 × 4 MIMO antenna design with folded ground plane for 2.4 GHz WLAN applications

“…The DG results obtained from the far‐field are more reliable as compared to the S ‐parameter, as discussed in Ref. . The simulated results for HFSS and CST are in a very good agreement.…”

“…The simulated ECC and DG results are presented in Figure . One way to validate the performance of a MIMO antenna system is to calculate ECC with more than one simulation software and compare the results . For this proposed 4 × 4 FGP, MIMO design, the simulated ECC results were obtained through Ansys HFSS and CST.…”

Design of Quad-Port MIMO/Diversity Antenna with Triple-Band Elimination Characteristics for Super-Wideband Applications

“…The ECC between port-1 and port-2 of a four-port MIMO system can be computed using the expression [26]:…”

A compact four-port UWB MIMO antenna with connected ground and wide axial ratio bandwidth

“…The ECC for a four-port MIMO system ( N = 4) between antenna elements i = 1 and j = 2 (Fig. 10) is expressed as [36]…”