Multi-Band Rectangular Two Element and Slotted Antennas for MIMO

Wireless multiband antennas are useful in various applications such as on rooftops of vehicles and in remote areas where multiple tasks are to be performed in a single device. This research presents a single-feed rectangular two-element array antenna and a slotted microstrip array antenna. The design is developed from a single rectangular patch and a two-element rectangular patch with a single feed. A single element radiates at 3.8 GHz, and two elements at 3.88 GHz,6.66 GHz, 7.59 GHz and 10.11 GHz. Slots are being created in the patches, at the edges and in the middle of the patch. Slotted antenna radiation frequencies are 6.25GHz, 7.70GHz, 9.6GHz,11.07GHz and 11.32GHz. This improves the working frequencies directivity, radiation efficiency and gain of the antenna. Quarter wavelength transformer (QWT) feeding is used for improving impedance matching to reduce reflections and hence improve antenna parameters. Detailed analysis and simulations of the antenna characteristics and various other parameters are performed using Ansys HFSS Software. Comparative analysis shows that the designed two-element antenna with inset feed has smaller dimensions 24.225 × 29.061 mm in slot antenna structure with a peak gain of 9.4dB and maximum radiation efficiency of 88.64 %.