A compact 30 × 30 mm 2 high performance four elements ultra-wide band multi-input multi-output (UWB MIMO) diversity antenna is proposed. The prototype antenna consists of four symmetrical antenna elements which are orthogonally placed on top surface of the substrate with partial slotted ground plane. The isolation among the antenna elements is improved by placing antenna elements orthogonally without any additional decoupling structure. The various antenna characteristic parameters, i.e., return loss (< −10 dB), isolation parameter (< −22 dB), radiation patterns near omnidirectional, and maximum realized gain 4.8 dB, were measured. The MIMO performances of prototype antenna were also measured in terms of various MIMO diversity parameters and found ECC < 0.06, DG > 9.98 dB, TARC < −10 dB and MEG < −3 dB throughout the frequency band. This design provides an operational bandwidth from 2.15 to 16.75 GHz which covers the whole UWB spectrum and is suitable for portable devices.
The Microstrip Patch Antenna design for new emerging technologies is an area of extensive research these days because of their low profile and ease of fabrication. Antenna design presented in this paper is well suited for Wi-MAX and WLAN application. The antenna is providing -10dB bandwidth of 4.14GHz from frequency 2.5GHz to 6.6GHz which is coming under the standards of these two technologies and good results have been achieved in the return loss and radiation pattern of the antenna. The design is made of FR4 substrate with modified ground plane structure and by inserting rectangular slits between feed line and radiating patch was implemented to change the effective length of the antenna. The radiation pattern of the antenna is presented using CST Microwave Studio which is well suited for wireless application.
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