Compact Quad-Port High Performance Uwb Mimo/Diversity Antenna With Slotted Ground Structure

Abstract

A compact 30 × 30 mm 2 high performance four elements ultra-wide band multi-input multi-output (UWB MIMO) diversity antenna is proposed. The prototype antenna consists of four symmetrical antenna elements which are orthogonally placed on top surface of the substrate with partial slotted ground plane. The isolation among the antenna elements is improved by placing antenna elements orthogonally without any additional decoupling structure. The various antenna characteristic parameters, i.e., return loss (< −10 dB), isolation parameter (< −22 dB), radiation patterns near omnidirectional, and maximum realized gain 4.8 dB, were measured. The MIMO performances of prototype antenna were also measured in terms of various MIMO diversity parameters and found ECC < 0.06, DG > 9.98 dB, TARC < −10 dB and MEG < −3 dB throughout the frequency band. This design provides an operational bandwidth from 2.15 to 16.75 GHz which covers the whole UWB spectrum and is suitable for portable devices.

High Isolation Four-Port Wrench Shaped Compact Uwb Mimo Antenna for 3.1-10.6 GHZ Band

“…To reduce this mutual coupling, various mutual coupling (MC) reduction or decoupling, or isolation enhancement techniques were introduced in the literature. They are neutralization line (NL) [2], decoupling network (DN) [3][4][5][6], metasurface, metamaterial (MTM) [7], electronic band gap (EBG) [8,9], frequency selective surface (FSS), photonic band gap (PBG), optically transparent structures [10], split ring resonator (SRR), complementary split ring resonator (CSRR) [11,12], dielectric resonator antenna (DRA), ground plane modification (GPM), defected ground structure (DGS) [13,14], slots [15][16][17][18], band notching techniques implementation, parasitic elements, metal strips, shorting pins, insertion of stubs [19][20][21], frequency reconfigurable [22,23], implementing PIN diodes, microstrip open loop resonator (MOLR), quasi self complementary antenna (QSCA) [24], inter element spacing [25][26][27][28][29], insertion of slits, fractal structures, modified substrates, locating antennas on different substrate layers, etc. These techniques improve impedance matching, enhance gain, efficiency, and increase the complexity of antenna design.…”

“…The ratio of MEG between two antennas must be nearly unity for high diversity gain. For S parameters, MEG is expressed by formula (15).…”

Dual-feed Orthogonally Polarized Compact 8-element MIMO Antenna Using Metallic Stub and Decoupling Unit for Isolation Enhancement of Sub-6 GHz 5G Application

“…Moreover, the antenna footprint with sustained port isolation explores new ideas based on SIW self-multiplexing antenna [5][6][7]. In MIMO, orthogonally polarized elements are highly isolated from each other [8][9][10][11]. Further, by utilizing various decoupling structures, it is possible to improve the isolation between elements [1,[12][13][14][15][16][17][18][19][20][21].…”