Compact modified ‘T’ slot circular patch quad band antenna for MIMO applications

Abstract

Compact modified T-slot circular patch antenna for multiple input multiple output (MIMO) applications, which has good response for four operating frequency bands is developed. Here the design consists of a circular patch with a new slot loaded T- shape on one side of the substrate and a feeder line on the other side of the substrate. A shorting pin is located between the patch and the feeder line. This proposed antenna resonates at the frequencies of 2, 4.8, 5.4, and 6.2 GHz covering the S-band, C-band, and LTE applications. The independent tuning of frequency bands is achieved by varying the length of the slots. By independent tuning of frequency bands, the selection of interested frequency band is achieved. The single element with miniaturized size of 1.945λ × 1.945 λ (30 × 30 mm2) is achieved including the feed line. The antenna has been tested for MIMO applications. The measured envelope correlation coefficient between the two elements, which are spaced 0.139 λ is <0.1(low correlation) and mutual coupling is found to be in the range of −20 dB to −80 dB. The simulation and measurement results of reflection coefficient, mutual coupling, and radiation pattern are presented.

Analysis of Substrate and Shapes of Microstrip Antenna for 5G Wireless Communication

“…If the size of the slot reduces, it leads to back radiation [53].Normally U-slot is employed to make to operate at multiple frequencies and to increase the bandwidth. The other slots such as E-slot, L-slot, H-slot are the common structures are used [54][55][56][57][58][59][60][61].…”

Improving the Performance of a Microstrip Antenna by Adding a Slot into Different Patch Designs

“…Nevertheless, the insertion of (or cutting) a slot in the patch section itself has proven to be more useful and practical in enhancing the antenna performance. Such approach has been demonstrated in several researches for various frequency bands including WiMAX, WLAN, 3G, microwave, radar, and other application bands [1,2,4,6,[22][23][24][25][26][27][28][29][30][31]. All these researches used slots in rectangular or circular patch shape with a ground plane being located in the back surface of the antenna.…”