Abstract
ABSTRACT This paper presents a 2-port MIMO antenna with a CPW feed, designed for dual-band operation with high isolation. We resolved bandwidth and polarization issues in the antenna’s initial CPW-fed design by modifying the radiating patch and incorporating an asymmetrical ground plane. These adjustments enabled dual-band and dual-polarization functionality. The first band, with linear polarization, operates between 2.75 GHz and 2.86 GHz for sub-6 GHz wireless applications, while another band exhibits circular polarization with wide-band resonating at two frequencies, in the (4.7–5.6) GHz and (7.1–8.5) GHz ranges, respectively, covering the entire C-band and suitable for wide-band applications. The antenna, built on a Rogers-5880 substrate (1.57 mm thickness, εr = 2.2, tan δ = 0.0009), offers low loss and excellent thermal stability. The antenna, measuring 45.5 × 27 × 1.57 mm3, attains port isolations of 27 dB and 22.4 dB, with peak realized gains of 2.8 dB and 5.4 dB in the two bands. Furthermore, we analyze the key performance of the MIMO antenna, including the envelope correlation coefficient (ECC), diversity gain (DG), total active reflection coefficient (TARC), and channel capacity loss (CCL), and confirm that they fall within an acceptable range, making it an excellent choice for many portable wireless applications.
Published Version
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