Design of Triple Band-Notched Uwb Mimo/Diversity Antenna Using Triple Bandgap Ebg Structure

Abstract

This paper presents the design of a compact triple band-notched ultra-wideband (UWB) two element multiple-input multiple-output (MIMO) antenna. To validate the simulation results, the prototype of the design is fabricated and experimentally measured. From the experimental results, it is observed that the proposed design, operating in the frequency range 2.5-12 GHz, successfully rejects three interfering bands, i.e., the WiMAX band, WLAN band, and X-band satellite communication downlink channel, when a triple bandgap CSRR-loaded EBG structure is embedded close to the feedline of the UWB antenna. In the ground plane of the MIMO antenna, a rectangular slot and a mirrored pair of F-shaped stubs are added to minimize the mutual coupling between the UWB elements. The proposed MIMO antenna has good wideband isolation between the elements (> 20 dB), high diversity gain (10 dB), and low envelope correlation coefficient (< 0.02) over the entire UWB.

A Flower-Shaped Miniaturized UWB-MIMO Antenna with High Isolation

“…Figure 1 depicts the topology of the proposed dual-port, flower-shaped UWB-MIMO antenna system, and Figure 2 shows the fabricated prototype. Compared with the antennas reported in [3,6,8,9,11,12,14], the MIMO antenna system proposed in this study has a smaller size of 30 × 18 mm 2 (0.84λ × 0.50λ), and was designed on an FR4 substrate with 1.6 mm thickness (tanδ = 0.02 and εr = 4.4). Two similar flower-shaped radiating elements and a metal ground make up the overall antenna model.…”

“…Furthermore, the authors of [13] proposed a UWB-MIMO antenna with four suppression bands and a T-shaped stepped stub on the back ground for achieving 3-11 GHz impedance bandwidth and −15 dB isolation. In [14], a triple bandgap CSRR-loaded EBG structure was inserted near the UWB antenna feedline, encompassing 2.5-12 GHz. The overall size of the proposed MIMO/diversity antenna was 30 × 44 mm 2 .…”

An Ultra-Wide Band MIMO Antenna System with Enhanced Isolation for Microwave Imaging Applications

“…In the literature, several UWB MIMO systems have been proposed [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. These UWB MIMO systems comprise different isolation enhancement techniques, including defected ground structure [DGS] [ 8 , 9 , 10 ], meander line resonators [MLs] [ 11 , 12 ], electromagnetic bandgap structures [EBGs] [ 13 , 14 ], shortening pins [SPs] [ 15 ], decoupling structures [DSs] [ 16 ], metamaterials, and different configuration techniques [ 17 , 18 , 19 , 20 ]. In [ 10 ], the authors present a compact (MIMO) antenna system tailored for ultra-wideband (UWB) applications.…”

Mutual Coupling Reduction in UWB MIMO Antenna Using T-shaped Stub

“…The mutual coupling is substantially below −15 dB when NL is introduced. To lessen MC, F-shaped stubs are added to the ground plane in [3]. In [4], MC is reduced by shorting pins and employing slots.…”