Antenna design for mimo applications

Abstract

In the present study, a miniaturized Pi-shaped slot antenna element is designed to newlinedevelop a 2×1 MIMO antenna with pattern diversity, which works at 5.2 GHz for the wireless newlinelocal area network (WLAN) universal serial bus (USB) dongle application. Where a near field newlinepassive parasitic is used to improve the isolation between antenna elements. newlineA compact meander loaded antenna element based two-element MIMO antenna with newlinepattern diversity for 5.8 GHz industrial, scientific and medical (ISM) band applications is newlinepresented. Two-element MIMO antenna has isolation higher than 20 dB without using any newlineisolation enhancement circuitry. newlineA hammer-shaped antenna working at 5.2 GHz in WLAN frequency band, gain of 5.3 newlinedBi, impedance bandwidth of 400 MHz, is developed to form a four-element MIMO antenna. newlineAn equivalent circuit model of hammer-shaped antenna and mathematical analysis for the newlineradiated electric field are developed and verified with measured results. The dual polarized newlineMIMO antenna exhibits pattern diversity and uses four shorting walls to achieve high isolation newlineand low correlation. newlineA single layer, four-element MIMO antenna using a travelling wave antenna operating newlinein the WLAN band from 5150 to 5850 MHz is presented. The proposed MIMO antenna newlineexhibits a higher degree of freedom encompassing pattern diversity, frequency scanning, and newlinedual polarization all in the same design, which makes it special. In addition, the proposed newlineMIMO antenna has isolation higher than 15 dB without using any isolation enhancement newlinecircuitry. newlineA compact four-element pattern diversity MIMO using step shaped antenna elements newlineis presented for 5.2 GHz WLAN applications. A switching network (using P-I-N diodes) is newlineused to introduce pattern reconfigurability in the proposed MIMO antenna. newline