Compact UWB Bandpass Filter with Dual Notched Bands Using E-Shaped Resonator

A compact dual-notched ultra-wideband (UWB) bandpass filter (BPF) using E-shaped resonator is proposed in this paper. By employing the theory of signal cancellation between two transmission paths, a UWB band with dual-notched bands (5.18 GHz and 8 GHz) can be realized independently. A five-pole UWB BPF is synthetically designed and simulated based on composite microstrip and slotline resonators. The dual-notched bands are realized and controlled by the odd- and even-mode of the E-shaped resonator. The simulated in-band performance shows good agreement with theoretical analysis.