Design of ultra‐compact UWB antenna with band‐notched characteristics for MIMO applications

Abstract

This study describes the design of a very compact dual‐band‐notched ultrawide band (UWB) multiple‐input multiple‐output (MIMO) antenna. The main features of the proposed antenna are its compact dimensions and high isolation between the two antenna elements. The UWB performance of the antenna is attained by designing two identical triangular‐shaped patch elements, which are designed opposite to each other and connected to a tapered microstrip feedline. The ground plane of the proposed antenna consists of a funnel‐shaped patch connected with two triangles at the lower end. In addition, two J‐shaped slits are etched in the radiator to get the band rejection characteristics at wireless local area network band from 5.1 to 5.8 GHz and IEEE INSAT/Super‐Extended C‐band from 6.7 to 7.1 GHz. The designed antenna has the smallest dimension of 26×15×1.6mnormalm3. Results show that the MIMO antenna has a large impedance bandwidth of 31.9 GHz from 3.1 to 35 GHz. The diversity performance of the proposed antenna is also analysed using different parameters such as envelope correlation coefficient (ECC), diversity gain, total active reflection coefficient and so on. Due to the low mutual coupling of <−24 dB and ECC of <0.2 across the frequency band this antenna is a good candidate for portable UWB applications.

Compact eight‐port MIMO/diversity antenna with band rejection characteristics

“…The proposed MIMO antenna has several advantages as compared with the existing antennas reported in the literature. [8][9][10][11][12][13][14][15][16][17][18][19][20][21] The proposed antenna consists of eight radiators that offer additional degrees of freedom to improve link reliability and transmission capacity. The single radiating element covers several allocated bands including the UWB, and these bands are effectively utilized by introducing diversity schemes.…”

“…In the last few years, a number of MIMO antennas with notch‐band characteristics have been reported. A compact MIMO antenna with two triangular‐shaped radiating elements and notch‐band characteristics was reported in . A notched‐band dual‐port antenna fed by an offset microstrip line, was presented .…”

“…A number of MIMO antenna designs with two, four, and eight radiating elements have been reported in the last few years. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] However, there was always a trade-off of antenna dimensions, isolation, resonating range, radiation characteristics, and complexity in all of these presented designs and techniques.…”

“…A compact MIMO antenna with two triangularshaped radiating elements and notch-band characteristics was reported in. 8 A notched-band dual-port antenna fed by an offset microstrip line, was presented. 9 A dual-port coplanar waveguide (CPW)-fed antenna was proposed in, 10 where the WLAN notch-band was achieved by implanting two L-shaped strips in the radiator.…”

A Review: Circuit Theory of Microstrip Antennas for Dual-, Multi-, and Ultra-Widebands

“…Gautam et al [97] designed UWB antenna for MIMO application. An antenna was excited with microstrip line, and resonating band was observed at 3.1-35 GHz.…”