Abstract
A compact four-element dual-band multiple-input and multiple-output (MIMO) antenna system is proposed to achieve high isolation and low channel capacity loss. The MIMO antenna was designed and optimized to cover the dual-frequency bands; the first frequency band is a wide band, and it covers the frequency range of 1550–2650 MHz, while the other frequency band covers the 3350–3650 MHz range. The measured wide-band impedance bandwidths of 1.1 GHz and 300 MHz were achieved in the lower and upper frequency bands, respectively. The proposed structure consists of four novel antenna elements, along with a plus-sign-shaped ground structure on an FR4 substrate. The overall electrical size of the whole dual-band MIMO antenna system is (W) × (L) × (H) for the lower frequency band. It achieved greater than 10 and 19 dB isolation in the lower and upper frequency bands, respectively. The antenna system accomplished an envelope correlation coefficient of in the lower frequency band, while it achieved in the higher frequency band. The computed channel capacity loss remained less than almost 0.4 bits/s/Hz in both frequency bands. Therefore, it achieved good performance in both frequency bands, with the additional advantage of a compact size. The proposed MIMO antenna is suitable for compact handheld devices and smartphones used for GSM (Global System for Mobiles), UMTS (Universal Mobile Telecommunications Service), WCDMA (Wideband Code Division Multiple Access), LTE (Long Term Evolution), 5G sub-6 GHz, PCS (Personal Communications Service), and WLAN (wireless local area network) applications.
Highlights
Multiple-input and multiple-output (MIMO) technology is identified as the key technology for 5G communication, as it enables systems to achieve peak data rates and higher spectral efficiency [1,2,3,4,5]
Four patch elements were printed on the top side of the substrate to achieve a four-element MIMO antenna system
A high-performance, compact, and dual-band MIMO antenna system was proposed for LTE and 5G applications
Summary
Multiple-input and multiple-output (MIMO) technology is identified as the key technology for 5G communication, as it enables systems to achieve peak data rates and higher spectral efficiency [1,2,3,4,5]. In [10], a four-element dualband MIMO antenna system was proposed to cover two frequency bands, i.e., 734–790 and 2307–2475 MHz. A partial ground was utilized for the structure to achieve isolation of better than 5 and 10 dB for the lower and upper frequency bands, respectively. The antenna had overall dimensions of 75 × 150 × 1.6 mm , and it covered the frequency ranges of 2.5–2.7, 3.45–3.8, and 5.00–5.45 GHz. The gain achieved was >5 dBi, while the isolation was better than 17 dB for all of the frequency bands. 0.3λ(L) × 0.008λ(H), so the proposed MIMO antenna achieves good performance in both frequency bands, with the additional advantage of compact size
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