CST – Computer Simulation Technology

Design and Performance Investigation of a Low Profile MIMO/Diversity Antenna for WLAN/WiMAX/HIPERLAN Applications with High Isolation

Title:
Design and Performance Investigation of a Low Profile MIMO/Diversity Antenna for WLAN/WiMAX/HIPERLAN Applications with High Isolation
Author(s):
Hari Shankar Singh, Gaurav Kumar Pandey, Pradutt Kumar Bharti, Manoj Kumar Meshram
Source:
International Journal of RF and Microwave Computer-Aided Engineering
Vol./Issue/Date:
Vol. 00, No. 00, Month 2015
Year:
2015
Keywords:
folded shorting strip, multiple-input multiple-output, total radiated power, Wi-MAX, WLAN
Abstract:
A low profile triband compact multiple input multiple output (MIMO) antenna operating at WLAN, WiMAX, and HIPERLAN bands is presented. The proposed MIMO antenna consists of two planar inverted-F antenna elements located at the top two corners of printed circuit board (PCB). Dimensions of each antenna elements are reduced substantially by employing a meandered line and folded patch structure so that it occupies a small volume of 9x 8.8x 5.4 mm3. The proposed antenna consists of three arms namely, Main arm, Side arm 1, and Side arm 2. Each individual arm resonates corresponding to the k/4 electrical length. Characterization of the antenna is carried out in the mobile environment as well as in user proximity. In the presence of mobile environment which includes liquid crystal display (LCD), Battery, RF components, and plastic housing, the isolation as well as reflection coefficient parameters deteriorated. To avoid the aggravation of S-parameters, two nonradiating folded shorting strips are connected between each antenna element and ground plane of PCB. This folded shorting strip not only improves the isolation between ports but also prevent the deterioration of reflection coefficient parameter. The total efficiency, envelope correlation coefficient, and multiplexing efficiency are studied in the user proximity. The optimized structure is fabricated and measured. The measured Sparameters cover WLAN (2.46–2.6 GHz), WiMAX (3.37–3.75 GHz), and HIPERLAN (5.2– 5.87 GHz) based on 210 dB reflection coefficient and 224 dB isolation is achieved between antenna ports. Good agreement is obtained between the simulated and measured results.
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