Abstract
This paper proposes a compact, semi-circular shaped multiple input multiple output (MIMO) antenna design with high isolation and enhanced bandwidth for ultrawide band (UWB) applications. A decoupling stub is used for high isolation reaching up to −55 dB over the entire bandwidth. The proposed antenna is used for UWB as well as super wide band (SWB) applications. The overall size of the proposed antenna is mm3. The and voltage standing wave ratio (VSWR) of the proposed antenna are less than −10 dB and 2, respectively, in the range of 3–40 GHz. The total impedance bandwidth of the proposed design is 37 GHz. The VSWR, , , , , gain, envelope correlation coefficient (ECC), radiation pattern, and various other characteristic parameters are discussed in detail. The proposed antenna is optimized and simulated in a computer simulation technology (CST) studio, and printed on a FR4 substrate.
Highlights
Over the past few decades, the field of antennas for wireless communication systems has been transitioning towards having a single radiator for multiple applications, when the need for higher speeds is in demand by consumers [1]
multiple input multiple output (MIMO) antennas are used on both sides of communication systems, to enhance communication quality and capacity of a channel [11]
In rectangular-shaped MIMO antennas, isolation is increased with the help of a narrow slot that is introduced on the ground plane
Summary
Over the past few decades, the field of antennas for wireless communication systems has been transitioning towards having a single radiator for multiple applications, when the need for higher speeds is in demand by consumers [1]. UWB and super wide band (SWB) antennas are examples of such antennas, and have been research considerations for the reasons stated above [2,3,4,5,6,7] These antennas have various advantages, such as fabrication simplicity, low power consumptions, high transmission rate, and low cost [8]. Keeping the above challenges in mind, the intent of this research was to design and analyze a planar MIMO antenna, which smaller in size, with a reduced mutual coupling between the radiating elements while maintaining a high degree of performance in terms of bandwidth, gain and efficiency with a simple design structure. Considered a challenging task, mutual coupling of the radiators in MIMO communications is reduced by introducing a novel T-shaped decoupling stub over the entire bandwidth while maintaining the optimized values of ECC < 0.01 and diversity gain (DG) > 9.98 dB, and comparable values of gain and efficiency with a simple design structure
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