A novel dual-band BPF using sierpinski-based resonator for WLAN

A dual-band bandpass filter (BPF) using fractals based geometry is proposed in this work. The theoretical design procedure of coupling filter can be applied into the proposed structure. By properly using the fractals resonators and the coupling feeline I/O ports, the transmission zeros can be generated aside the passband which simultaneously achieve high selectivity and high isolation for the two passbands. The BPF has good dual passband performance at 2.4/5.2 GHz and a superior filter performances in comparison of others works. Experimental results are in good agreement with the full-wave simulation results.