Abstract
A planar, microstrip line-fed, quad-port, multiple-input-multiple-output (MIMO) antenna with dual-band rejection features is proposed for ultra-wideband (UWB) applications. The proposed MIMO antenna design consists of four identical octagonal-shaped radiating elements, which are placed orthogonally to each other. The dual-band rejection property (3.5 GHz and 5.5 GHz corresponding to Wi-MAX and WLAN bands) was obtained by introducing a hexagonal-shaped complementary split-ring resonator (HCSRR) in the radiators of the designed antenna. The MIMO antenna was etched on low-cost FR-4 dielectric substrate of size 58 × 58 × 0.8 mm3. Isolation higher than 18 dB and envelope correlation coefficient (ECC) lesser than 0.07 was observed for the MIMO/diversity antenna in the operating range of 3–16 GHz. The presented four-port UWB MIMO antenna configuration was fabricated, and the experimental results validate the simulation outcomes.
Highlights
The use of ultra-wideband (UWB) technology for wireless applications has seen a surge after the Federal Communications Commission (FCC) specified the 3.1–10.6 GHz band as an unlicensed band [1].Recently, UWB antennas have attracted the focus of RF engineers and researchers due to their extensive usage in sensing networks, cognitive radios, microwave imaging, wearable devices, military applications, wireless personal area networks, and high data rate communication systems
UWB antennas suffer from the disadvantage that radiation can be transmitted to smaller distances only, which is due to the use of low power for transmission, as mentioned by the Federal Communications Commission (FCC) [5]
The close placement of resonating elements will result in poor isolation and high envelope correlation coefficient (ECC), which deteriorates the functioning of the designed system
Summary
The use of ultra-wideband (UWB) technology for wireless applications has seen a surge after the Federal Communications Commission (FCC) specified the 3.1–10.6 GHz band as an unlicensed band [1]. In [12], a small-sized two-port MIMO antenna comprised of square-shaped monopole resonators and a T-shaped metal stub embedded in the ground surface to reduce mutual coupling was proposed. In [14], a planar filtenna with shunt short-circuited stubs and three interdigital edge-coupled patterns was suggested for UWB MIMO applications, where dual notched-band characteristics were realized by introducing a complementary split-ring resonator (CSRR). In [18], a quad-port UWB MIMO structure with two notched frequency bands was suggested, where the dimensions of the antenna were optimized by using an iterative design method In this communication, a planar, compact, MIMO antenna comprising four identical octagonalshaped resonating elements is proposed. The metallic strips increase the isolation among four resonators of the MIMO/diversity antenna
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