A four element, planar, compact UWB MIMO antenna with WLAN band rejection capabilities

Abstract

A planar, compact UWB MIMO antenna with four elements that accomplish band rejection from 4.91 to 6.41 GHz is presented. Rejection is accomplished using an L‐C stub connected to the ground plane. The length of the stub is changed to reject the band starting from 2.5 GHz to above 8.8 GHz. The perpendicular placement of the elements enables polarization diversity and attains high isolation. Elements 3 and 4 are 180° mirrored transforms of elements 1 and 2 on the opposite corners of the substrate. The antenna measures 50 × 50 mm2 only with all four elements placed. The simulated results are validated by measurements of a fabricated prototype. The design attains the targeted specifications over the entire bandwidth of 2 to 12 GHz with a reflection coefficient better than −10 dB (except the rejected band), isolation more than 17 dB, low envelope correlation, low gain variation and strong rejection of the signals in the WLAN band. The small size and reduced complexity to obtain WLAN rejection makes the proposed design very useful for diversity applications and portable handheld devices with MIMO antennas as designed by panorama antenna.

Reconfigurable hexagon shaped printed antenna for cognitive radio application

“…The proposed antenna in Reference 23 was suitable for short range radar applications with an average gain of 6 dBi over the frequency band. However, the proposed antenna provides higher peak gain and very less ECC value (1.2 × 10 −4 , while performed under transmit and receive scenario, Figure 11B) than reported in References 21,22 at the cost of size of the antenna. Although the proposed antenna has smaller bandwidth (108.64%) compared to Reference 23, but it provides high gain and is also smaller in size (40 mm × 40 mm) than reported in Reference 23.…”

“…The recent growth in cultivating research over MIMO antenna systems has provided a comprehensive impact on the antenna researchers. In Reference 21, a compact UWB four element MIMO antenna was presented. The proposed antenna in Reference 21, provided UWB behavior in the range of 2 to 12 GHz with better than 17 dB isolation and low envelope correlation coefficient (ECC) and useful for diversity applications.…”

“…In Reference 21, a compact UWB four element MIMO antenna was presented. The proposed antenna in Reference 21, provided UWB behavior in the range of 2 to 12 GHz with better than 17 dB isolation and low envelope correlation coefficient (ECC) and useful for diversity applications. Khan et al in Reference 22 proposed a compact UWB MIMO antenna with very low ECC and also exhibited low mutual coupling lower than −15 dB.…”

Compact Wideband Four Element Optically Transparent MIMO Antenna for mm-Wave 5G Applications

“…In [15], MIMO antenna radiating in the Wi-Fi frequency band using a combination of 3 dipoles and 1 slot antenna is proposed. A 4-port compact MIMO antenna for WLAN application is proposed in [16] [23], and other wireless applications [22][23][24][25][26][27][28][29] are proposed. In [30], an eight-element MIMO antenna applicable for mobile terminals working in sub 6GHz 5G band working from 3.3 -3.6 GHz is proposed.…”

“…Some of the selected MIMO antennas are compared in terms of operating frequency, the material used, radiation efficiency, and diversity parameters as shown in Table I. The MIMO antennas in the literature were mainly proposed for frequency band between 1-10 GHz [14, 24,28] with very less work carried out in the mm-wave band [35,36,37]. More importantly, the transparent antennas are still not tested to work for mm-wave MIMO applications [4, 5, 6].…”