Design of a Compact 4×4 Ultra-Wideband (UWB) MIMO Antenna with Quadra Band-Notch Characteristics on FR-4 Substrate for Wireless Communication Applications. JOTECS [Internet]. 2026 Apr. 29 [cited 2026 Apr. 30];2(1):6-12. Available from: https://jotecs.org/index.php/jotecs/article/view/86