Microstrip Patch Antenna System With Enhanced Inter-Port Isolation for Full-Duplex/MIMO Applications

Abstract

In this paper, we propose a closely spaced two-port microstrip patch antenna system with significant isolation enhancement (> 90 dB), which can be deployed for MIMO as well as full-duplex transceiver systems. We deploy a resonant combination of rectangular defected ground structure (DGS) and a near-field decoupling structure (NFDS) in the vicinity of a closely spaced (inter-element spacing = 0.01λ 0 ) two-port microstrip patch antenna system at 5.85 GHz. This drastically reduces the port-to-port mutual coupling (< −90 dB), which can help in self-interference cancellation for full-duplex point of view without any additional circuitry, while still preserving desired impedance matching performance (< −15 dB). The broadside gain of individual antennas in the two port MIMO system is 7.11 dBi, with 97% efficiency and coto-cross-polar level < 25 dB. The proposed concept is validated by full-wave simulation in CST Microwave Studio, as well as experimental results on fabricated prototype. Moreover, MIMO performance metrics such as total active reflection coefficient (TARC), envelop correlation coefficient (ECC) and channel capacity loss (CCL) are analysed using simulation and measurement.

Development of a Wide Bandwidth Massive Eight Dissimilar Radiating Element Multiband MIMO Antenna for mm-Wave Application

“…Table I shows the length D and width C of the DGS in the ground plane. The ground plane is made up of rectangular-DGS cut slots [1][2][3][4][5][6] that are utilized to improve isolation In this section, the operation of the single radiating patch of the antenna is explained using the equivalent circuit model. That is applicable to all radiating patches.…”

“…A DGS technique is used to improve isolation. Cut slots of various shapes are used in the ground plane [1][2][3][4][5][6]. To improve isolation, a decoupling structure is constructed that decouples the input of radiating patches from the matching network setup in [7][8][9][10][11].…”

Development of Two UWB Multiband MIMO Antennas with Enhanced Isolation and Cross-Correlation

“…Various techniques, such as Defective Ground Structure (DGS), Parasitic Elements (PEs), metamaterials, Decoupling Structures (DSs), and Electromagnetic Band Gap (EBG) are used to increase isolation and CC. In the ground plane, carved holes of different shapes are employed in DGS methods [2][3][4][5][6][7]. In order to promote isolation, a decoupling structure is built that isolates the input of the radiating patches from the corresponding network arrangement in [8][9][10][11][12].…”

A Study of Mutual Coupling Suppression between Two Closely Spaced Planar Monopole Antenna Elements for 5G New Radio Massive MIMO System Applications

“…The literature offers several techniques for mutual coupling reduction, including incorporation of electromagnetic bandgap (EBG) structures [7][8][9], defected ground structures (DGS) [10][11][12], decoupling networks [13][14][15][16], a complementary split-ring resonator (CSRR) [17,18], neutralization lines [19,20], metamaterials [21][22][23], and parasitic or slot elements [24][25][26].…”

“…Introducing arcs on the patch of the monopoles and on the ground plane enhances the performance of an antenna system and increases the mutual impedance among elements. The authors in [11] propose a two-port antenna which comprises a threelayer structure. Rectangular-shape defects in the ground plane are introduced to enhance the isolation between the two antenna ports.…”