Compact UWB antenna with controllable band notches based on co-directional CSRR

In this paper, compact ultra-wideband (UWB) antenna with controllable notched bands is proposed for UWB communication applications. The antenna utilizes co-directional complementary split ring resonator (CSRR) to achieve dual suitable notched bands in small enough size. The center frequencies of the notched bands can be electronically tuned by changing the effective electrical length of the CSRR, which is achieved by employing varactor diodes. The proposed antenna can also achieve reconfigurable notched bands by replacing the varactor diodes with two electronic switches. The total antenna dimensions are only 25 × 33 mm² and shows good environmental adaptation, which makes it a good candidate for UWB applications.