Complementary meander‐line‐inspired dielectric resonator multiple‐input‐multiple‐output antenna for dual‐band applications

Abstract

The communication presents a simple dielectric resonator (DR) multiple-input-multiple-output (MIMO) dual-band antenna. It utilizes two “I”-shaped DR elements to construct an “I”-shaped DR array antenna (IDRAA) for MIMO applications. The ground plane of the antenna is defected by two spiral complementary meander lines and two circular ground slots. In the configuration, two “I”-shaped DR elements are placed with a separation of 0.098λ. The antenna covers dual-band frequency spectra from 3.46 to 5.37 GHz (43.26%) and from 5.89 to 6.49 GHz (9.7%). It ensures the C-band downlink (3.7-4.2 GHz), uplink (5.925-6.425 GHz), and WiMAX (5.15-5.35 GHz) frequency bands. Each DR element is excited with a 50-Ω microstrip line feed with aperture-coupling mechanism. The antenna offers very high port isolation of around 18.5 and 20 dB in the lower band and upper band, respectively. The proposed structure is suitable to operate in the MIMO system because of its very nominal envelope correlation coefficient (<0.015) and high diversity gain (>9.8). The MIMO antenna provides very good mean effective gain value (±0.35 dB) and low channel capacity loss (<0.35 bit/s/Hz) throughout the entire operating bands. Simulated and measured results are in good agreement and they approve the suitability of the proposed IDRAA for C-band uplink and downlink applications and WiMAX band applications.