A compact ultrawideband (UWB) antenna with a band-notch function is proposed for laptop applications. The band-notch function is realized by a half-wavelength parasitic element printed on the rear side of the substrate. The impedance bandwidth (VSWR < 2) of the antenna is 3.1 ~ 11.4 GHz (114%) with a notched frequency from 5.05 to 5.90 GHz. The antenna has a fairly good omnidirectional pattern, and the average gain is -3.0 ~ -1.2 dBi over the UWB frequency band except for the notched frequency band. The performance of the proposed antenna is confirmed by simulation and measurement results.
Choi, Nakchung, Jung, Changwon, Byun, Joonho, Harackiewicz, Frances J., Park, Myun-Joo, Chung, Yong-Seek, Kim, Taekyun and Lee, Byungje. "Compact UWB Antenna With I-Shaped Band-Notch Parasitic Element for Laptop Applications." (Jan 2009).