Compact 2 × 2/4 × 4 tapered microstrip feed MIMO antenna configuration for high‐speed wireless applications with band stop filters

Abstract

In this research, compact tapered feed 2 × 2/4 × 4 MIMO antenna are presented and investigated. The proposed MIMO antenna consists of a square patch and modified rectangular ground, which is chamfered at edges and etched with two semicircular slots. Likewise, obstruction caused by WiMAX and WLAN interfering bands is also taken care of by introducing notched filters. WiMAX is removed by embedding an rotated T-type stub and a C-type slot eliminates the WLAN band. The proposed antenna configuration covers the usable bandwidth of 3.07 to 11.25 GHz for 2 × 2 MIMO and 2.97 to 11.28 GHz for 4 × 4 MIMO. Also, both the MIMO antennas provide isolation <-20 dB. Proposed MIMO antennas are fabricated and characterized in near, far-field, and diversity performance where envelope correlation coefficient, directive gain (DG), total active reflection coefficient (TARC), and channel capacity loss are simulated and measured. 4 × 4 MIMO antenna configuration provides stable gain with a maximum radiation efficiency of 91% and monopole radiation patterns.

Miniaturized Quad-Port Conformal Multi-Band (QPC-MB) MIMO Antenna for On-Body Wireless Systems in Microwave-Millimeter Bands

“…The MIMO configuration will enhance the bandwidth and ensures the receiving of the signal efficiently when the signal impinges at any angle on the receiver antenna. The Shannon-Hartley theorem on channel capacity is given by [41] 𝑪𝒉. 𝑪𝒂𝒑.…”

Compact high isolation UWB MIMO antennas

“…In this sub-section, a parallel feed two elements MIMO antenna is designed. It is well known that parallel feed MIMO antennas have lower isolation than orthogonally feed MIMO antenna [25][26][27][28][29]. Figure 3 shows the geometry of the two elements parallel feed UWB MIMO antenna (version 1).…”

Asymmetrical fed Calendula flower-shaped four-port 5G-NR band (n77, n78, and n79) MIMO antenna with high diversity performance

“…Radiation pattern and polarization diversity are achieved in four pairs of microstrip fed antenna which also consists of dual-concentric annular slots [23, 24] and five concentric stubs placed between four radiators [25]; a defected ground structure monopole of 4 × 4 configuration uses no isolation element as the inter-spacing between them achieves higher isolation [26] and by maintaining the spacing of <0.05 λ between radiators isolation of more than 16 dB is achieved [27]. Three MIMO antenna configurations [28–30, 32, 33] with four radiating patches utilize no decoupling structures and a fan-shaped parasitic structure between the four-radiating patch achieves better isolation [31]. A three-layered MIMO antenna offers high diversity performance with isolation <−20 dB [34] and four square-patch placed exactly at the center of the edges with defected ground records isolation of <−37.50 dB in the operating band of interest [35].…”