A compact two element MIMO antenna with improved isolation for wireless applications

Abstract

This paper presents a compact 55× 20 mm2 wideband multi-input-multi-output (MIMO) antenna. The proposed structure consists of two antenna elements excited using CPW feeding technique and is printed on a low cost and easily available FR4 substrate. In the proposed MIMO design, the first antenna at port 1 is fixed in its position and orientation while, the second antenna at port 2 is placed in six different orientations by keeping the overall dimension constant. The observation is made on the variation in the insertion loss as the orientation of the second antenna is altered. With this analysis, the orientation of second antenna element giving the least interference and insertion loss is proposed, and all the parameters are studied. The proposed design exhibits an average peak gain greater than 2.8 dBi, envelope correlation coefficient (ECC) less than 0.0001, insertion loss less than -38 dB and stable radiation patterns over the entire wide bandwidth. The antenna operation (i.e. |S11| and |S22|<-10 dB) ranges from 4.1 to 6.4 GHz at port 1 and 4.35 to 6.5 GHz at port 2, thereby making the antenna suitable for Wireless Local Area Network (WLAN) and Wireless Fidelity (Wi-Fi) applications.

Four-element MIMO antenna for X-band applications

“…On the other hand, improving the isolation characteristic of a MIMO system by consideration of device compactness is a significant challenge [2]. Till now, numerous MIMO antennas with different designs that use several isolation methods to improve the antenna performance were presented in the literature [3–8]. In [3, 4] two elements of the MIMO antennas are placed orthogonally to achieve isolation.…”

“…Till now, numerous MIMO antennas with different designs that use several isolation methods to improve the antenna performance were presented in the literature [3–8]. In [3, 4] two elements of the MIMO antennas are placed orthogonally to achieve isolation. In addition, to enhance the isolation, a parasitic structure embedded between elements in [4].…”

Stacked T-Shaped Strips Compact Antenna for WLAN and WiMAX Applications

“…Now a days market demand for compact wireless portable device is increasing rapidly. Hence, in regard to this demand, design of miniaturized multiband antenna has attracted many researchers [3][4][5][6]. Multiband antenna works for more than one standard is vital component for portable devices.…”

Multiple-input multiple-output antenna for dual-band applications with a novel radiating patch and enhanced feeding network

“…Multi-input multi-output (MIMO) antennas are a good solution for the mentioned issues. Also, there are lots of designs introduced in the recent years, such as Rezvani and Zehforoosh (2018), Aw et al (2019), Babu et al (2019). MIMO antennas were designed for the most of the wireless technology systems including Bluetooth and WLAN.…”