Design & Isolation Reduction of Circle Inserted MIMO Antenna

Abstract

In modern telecommunications system MIMO antenna plays an important role having the capability to radiate wave is extra than one radiation pattern & polarization is also another critical factor. This article describes the design & reduction of isolation between the two symmetrical patches. The separation between the two patches must be maintained to reduce the isolation is 0.02 λ0 The proposed system having a compact size of $38\,\,\mathrm {m}\mathrm {m}\times 25$ mm with a FR-4 substrate and loss tangent of 0.02 is considered. The MIMO system is resonate at a frequency of 3.98 GHz obtained the reflection coefficient (S11) of −39.71 dB & greatly reducing the isolation (S12) of −50 dB. At the resonant band of frequency the impedance bandwidth of the systems is around 1.76 GHz. The proposed design maintained the VSWR ≤ 2 and ECC < 0.04 is maintained at the resonant band of frequency. The different time domain analysis parameters like group delay, diversity gain, real/ imaginary impedances and peak gain is also measured here. The group delay and diversity gain at the resonant frequency of proposed MIMO structure is observed −2.48 ± 1nsec & 9.999 dBi.