Low Mutual Coupling Between Mimo Antennas by Using Two Folded Shorting Strips

Abstract

Abstract-This paper presents a compact dual-band multiple input multiple output (MIMO) antenna with low mutual coupling, operating in the 2.4 GHz band (2.4-2.485 GHz) and 5.5 GHz band (5.15-5.85 GHz). The proposed antenna system consists of two antenna elements located at the top two corners of FR4 substrate (PCB). Each element dimension is reduced substantially by employing a folded structure and slots on the top patch plate, so that it takes up a small volume of 12 × 9 × 6 mm 3 . To enhance port-to-port isolation and efficiency of each antenna, an additional non-radiating folded shorting strip is connected between each antenna element and ground plane of PCB. The measured isolation values are lower than −28 dB over the lower WLAN band (2.4-2.485 GHz) and better than −26 dB (−30 dB in most of the band) across the higher WLAN band (5.15-5.85 GHz). The improvement in antenna's efficiency caused to raise up 1 dB of effective diversity gain of MIMO system. Furthermore, S-parameters, radiation patterns and diversity performance characteristics are provided.

Multi-Band Antenna Array Based on Double Negative Metamaterial for Multi Automotive Applications

“…For evaluating envelop correlation coefficient between four antennas on car body, different cases have been considered. Figure 8(a) depicts the ECC on outdoor cases where cross polarization ratio (XPR) = 1 is implemented using Gaussian for elevation and uniform for azimuth [12]. It shows that a low ECC (< 0.01) have been achieved in all cases when the four antennas are placed on car body while Figure 8(b) depicts that EDG which are computed at 1% are closely to 10 dB across desired bands.…”

“…(g) (h) from total far field radiation pattern [12]. The effectiveness of diversity in term of diversity gain can be calculated using Eq.…”

Design of High-Isolation Compact Mimo Antenna for Uwb Application

“…Many MIMO antennas have been proposed to reduce the mutual coupling for UWB systems [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. In [4][5][6][7][8], various decoupling structures have been inserted between two antenna elements to enhance wide band isolation. In [9,10], MIMO antenna has been proposed for WLAN and with a dual-band.…”

MIMO Antenna Performances on Microstrip Antenna with EBG Structure for WLAN Applications

“…Higher antenna efficiencies and lower correlation coefficients can be achieved with lower mutual coupling [2]. Previous work that related with reduction of mutual coupling techniques studied in [3][4][5][6][7][8][9][10][11]. Authors in [3] proposed T-Shape slot impedance transformer with isolation over 19.2 dB and 22.8 dB at 2.4-2.48 GHz and 3.4-3.6 GHz respectively with correlation coefficients less than 0.5.…”

“…Authors in [3] proposed T-Shape slot impedance transformer with isolation over 19.2 dB and 22.8 dB at 2.4-2.48 GHz and 3.4-3.6 GHz respectively with correlation coefficients less than 0.5. Mutual coupling lower than -28 dB over WLAN band was achieved in [4], by introducing an additional non radiating folded shorting strip between elements and ground plane. Two packed antennas with coupling element is reported in [5] with mutual coupling, S 21 <-15 dB was obtained, with edge to edge separation is 0.04λ.…”