A Compact Planar Ultra Wideband Antenna with Triple-Notched Bands Using Capacitive Coupled and Parallel LC Elements

摘要

Overlapping of frequency bands such as Worldwide Interoperability for Microwave Access (WiMAX), Wireless Local Area Network (WLAN) and International Telecommunication Union (ITU) bands with Ultra Wide Band (UWB) cause serious interference problems. As an attempt to reduce the effect of this coexistence, a triple band-notched monopole antenna is presented. A modified semi ellipse element with two I-shaped slots is used as the ground plane. A U-shaped slot, a pair of inverted L-shaped strips, and a modified G-slot structure which act as parallel LC circuit and capacitive-coupled elements, are embedded in feed line and radiation patch to create the triple band notch characteristics. The notched bands position can be controlled by tuning the dimensions of the foregoing filtering elements. The proposed antenna has been fabricated and measured. According to the measured results, the antenna operates over the frequency band of 2.5-16.5 GHz with three notched bands at the 5-6.2 GHz (WLAN), 3.1-4 GHz (WiMAX), and 7.15-8.1 GHz (X-band).