Mimo antenna with high frequency selectivity and controllable bandwidth for band‐notched UWB applications

Abstract

A multiple‐input–multiple‐output (MIMO) antenna with high frequency selectivity and controllable bandwidth, is proposed for band‐notched ultrawideband (UWB) applications. In other words, it has a bandstop‐filter‐like response (second‐order notched band) at the aimed rejected band. It consists of two rectangular printed monopole (PM) elements and a simple stepped ground stub to enhance wideband isolation. For achieving the second‐order rejected band of the IEEE 802.11 wireless local area network (WLAN) band from 5.15 to 5.85 GHz centered at 5.5 GHz, two parasitic modified split‐ring resonators (PMSRRs) and two inverted L‐shaped branches (ILBs), are utilized. Measured results prove a bandwidth of S11 < −10 dB and S12 < −15 dB at 2.8–12 GHz excluding a rejection band of 5–5.95 GHz. Its size is only 32 × 26 mm2 on a cost‐effective FR4 substrate. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1886–1891, 2016

Compact Printed Mimo Antenna With 6.1 GHZ Notched Band for Ultra-Wideband Applications

“…It is very challenging to realize UWB MIMO antennas in compact size with high isolation between antenna elements, since typically the separated radiating structures have strong mutual coupling in limited spaces. In the last few years, various types of UWB MIMO antennas are proposed [1][2][3][4][5][6][7]. For instance, T-shaped ground-stub is utilized as a decoupling structure.…”

“…For instance, T-shaped ground-stub is utilized as a decoupling structure. However, the T-shaped groundstub should be longer than the antenna element to decrease the coupling, so the areas of above UWB MIMO antennas are often relatively large, for instance, 60×40 mm 2 in [2], 35×30 mm 2 in [3], 32×26 mm 2 in [5]. New materials are also attempted for decoupling, for example, carbon black film [6] which could absorb electromagnetic signal, but the radiation patterns do not exhibit perfectly.…”