Abstract
This paper presents a close-spaced dual-band 2 × 2 multiple-input multiple-output (MIMO) antenna with high isolation based on half-mode substrate integrated waveguide (HMSIW). The dual-band operation of the antenna element is achieved by loading a rectangular patch outside the radiating aperture of an HMSIW cavity. The HMSIW cavity is excited by a coaxial probe, whereas the rectangular patch is energized through proximity coupling by the radiating aperture of HMSIW. The antenna elements can be closely placed using the rotation and orthogonal arrangement for a 2 × 2 array. Small neutralization lines at the center of the MIMO antenna can increase the isolation among its elements by around 10 dB in the lower band and 5 dB in the higher band. A prototype of the MIMO antenna is fabricated and its performance is measured. The measured results show that the resonant frequencies are centered at 4.43 and 5.39 GHz with bandwidths of 110 and 80 MHz and peak gains of 6 and 6.4 dBi, respectively. The minimum isolation in both bands is greater than 35 dB. The envelope correlation coefficient is lower than 0.005 within two operating bands.
Highlights
Antenna systems that support multiple wireless standards and have compact size are highly desirable for future portable devices
Pattern diversity can be realized by discriminating antenna elements over an angled space, whereas polarization diversity can be achieved by orthogonally arranging the antenna elements
A dual-band antenna element obtained by loading a rectangular patch outside an half-mode substrate integrated waveguide (HMSIW) cavity is proposed, as shown in Figure 1. e antenna element has only one substrate layer, and the bottom side of the substrate is a metallic ground plane. e HMSIW antenna is fed by a coaxial probe, whereas the patch antenna is excited through proximity coupling by the radiating aperture of the HMSIW antenna. e HMSIW antenna generates the lower band, whereas the loading patch generates the upper band
Summary
Antenna systems that support multiple wireless standards and have compact size are highly desirable for future portable devices. International Journal of Antennas and Propagation e second type of decoupling for MIMO antenna involves inserting a decoupling structure between the antenna elements to block or suppress the coupling, which includes defected ground structure [5], complementary split-ring resonator [6], electromagnetic bandgap [7], neutralization line [8], T-shaped stub [9], and ring strip [10] These structures increase the space between antenna elements, which results in larger antenna sizes. By combining the spatial and polarization diversities and using small neutralization lines (SNLs), a close-spaced 2 × 2 MIMO antenna with high isolation and dual-band operation is suggested.
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