Abstract
This paper presents the performance improvement of a co-planar waveguide rectangularly notched UWB-MIMO antenna. The isolation and gain of the antenna are enhanced by using a parasitic isolator. The antenna consists of four microstrip patch antennas and an isolator. The UWB characteristic of the antenna is achieved by truncating the lower ends of the radiating patch by a semicircle. The rectangular notch characteristic is obtained by adding two electromagnetic bandgap structures on the backside of the antenna, which is attached to the radiator via shorting pin. The performance, especially the decoupling of the MIMO antenna is improved by using a novel parasitic decoupler, which is placed between the antennas to receive uncorrelated signals. The decoupling structure consists of a square shape metallic element with a circular slot inside and a half-semicircle slot edged at each corner. Four rectangular metallic stubs are extended from opposite parallel sides to improve further isolation. The simulated and measured results show that the antenna has a rectangular notch band (5.25–5.85 GHz) across the working band of 3–12.8 GHz. In addition, the antenna has a planar structure with an overall size of 60 × 60 × 1.52 mm3 and offers stable gain, reduced mutual coupling (<−21 dB), and lower envelop correlation (<0.001).
Highlights
In radio communication, an antenna is an interface between radio waves propagating through space and electric currents moving in metal conductors, used as transmitters or receivers
The peak gain in the MIMO antenna is 6.94 dBi, increased by 2.44 dBi than a single element which is 4.5 dBi. This increase of the gain in the MIMO antenna system is due to the current redistribution, of more than one radiation element
A rectangularly notched band UWB-MIMO antenna with an overall size of 60 × 60 × 1.52 mm3 is presented in this paper
Summary
An antenna is an interface between radio waves propagating through space and electric currents moving in metal conductors, used as transmitters or receivers. In the multi-path environment, signal fading degrades the performance of UWB systems, which affects the efficiency and quality of signal transmission To address this problem, Multi-Input-Multi-Output (MIMO) technology has been used to provide a multi-element patch antenna for signal transmission or reception. Multi-Input-Multi-Output (MIMO) technology has been used to provide a multi-element patch antenna for signal transmission or reception It can significantly increase spectral efficiency, reliability, and channel capacity without utilizing extra power and spectrum. It is widely used in the design of antennas in different networks to enhance the performance of communication systems. Different isolation techniques have been used by researchers to reduce mutual coupling in the MIMO antennas [7,8]
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