Multi-standard, multi-band planar multiple input multiple output antenna with diversity effects for wireless applications

Wireless generations require the miniaturized radiating elements for the portable devices. This research article presents a miniaturized multiple input multiple output (MIMO) antenna for IEEE 802.11 (WLAN) and IEEE 802.16 (WiMAX) wireless standards. The multi-standard, multi-band MIMO with 1x2 diversity arms is impedance matched with 50 microstrip line on FR-4 dielectric substrate having dielectric constant 4.4 and 1.524mm thickness. The simple low profile design covers16.46% (2.23-2.64GHz) and 12.37% (3.26-3.70GHz) microwave frequency bands, with voltage standing wave ratio (VSWR)2 achieves more than 12.5 dB of isolation between radiating ports. The proposed MIMO with inverted L shaped slot exhibits more than 73% efficiency, and more than 4 dBi gain at resonant frequencies. The presented MIMO is designed on FR-4 dielectric substrate of size 45.1x90.2 mm(2). The compact size of the radiating element is 6.7x6.7 mm(2). The effect of radiations on the body has been evaluated using specific absorption rate (SAR) and found to be in safety limit.