MIMO ANTENNA WITH HIGH FREQUENCY SELECTIVITY AND CONTROLLABLE BANDWIDTH FOR BAND-NOTCHED UWB APPLICATIONS

摘要

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 S-11 < -10 dB and S-12 < -15 dB at 2.8-12 GHz excluding a rejection band of 5-5.95 GHz. Its size is only 32 X 26 mm(2) on a cost-effective FR4 substrate. (C) 2016 Wiley Periodicals, Inc.