Paper Title
A Compact Self Isolated UWB-MIMO Antenna using WiMAX and WLAN Notch Bands

Abstract
This paper presents the design and analysis of a compact self-isolated ultra-wideband (UWB) MIMO antenna capable of providing stable wideband performance while incorporating dual band-notch characteristics for WiMAX and WLAN applications. The proposed antenna achieves UWB operation by employing a modified monopole radiator and a defected ground structure (DGS), ensuring efficient impedance matching across the operating range. To suppress undesired interference, two independent notching mechanisms are introduced—one targeting the WiMAX band (3.3–3.7 GHz) and the other tuned to reject the WLAN band (5.15–5.825 GHz). A carefully engineered neutralization structure is implemented between the antenna elements to achieve high isolation without increasing physical size, making the design suitable for compact portable devices. Simulation results demonstrate excellent MIMO performance with high isolation, stable radiation patterns, low envelope correlation coefficient (ECC), and consistent gain across the operational UWB spectrum except at the intended notched bands. Keywords - UWB antenna, MIMO systems, band-notched characteristics, WiMAX, WLAN, self-isolation, defected ground structure (DGS), ultra-wideband communication, mutual coupling reduction, compact antenna design, frequency selective rejection, notch band engineering.