Highly isolated dual band stop two-element UWB MIMO antenna topology for wireless communication applications

摘要

A novel compact Ultra Wide Band (UWB) Multiple Input Multiple Output (MIMO) antenna with dual filtering property is proposed. Two monopole antennas with W-shaped and n-shaped slots on their radiating patch are arranged vertically to form the MIMO antenna topology. Each monopole is composed of a slotted radiating patch and a simple ground plane which yield band stop feature in Worldwide Interoperability for Microwave Access (WiMAX) and Wireless Local-Area Network (WLAN) frequency band. In the sequel, to enhance the isolation, a parasitic structure has been wiely embedded between two monopole antennas. Applying the aforementioned decoupling structure improves the isolation level from -17dB to -22dB. The proposed two-element MIMO antenna with vertical arrangement, covers UWB frequency range from 3.1 to 10.6 GHz with notches at WiMAX (3.3-3.8 GHz) and WLAN (5-6 GHz) bands. The inter element isolation is less than -22 dB and in most cases even is less than -25 dB over the entire operating frequency band. The obtained simulated and measured results confirms suitable good matching acceptable Envelope Correlation Coefficient (ECC), efficiency, group delay, and radiation patterns. All these gurantrees a promising performance for the proposed MIMO antenna.