Design Asymmetrical Dual-band BPF Using SIRs for WLANs

The aim of the paper is to design, simulate and measure microstrip dual-band bandpass filter (BPF) employing coupled stepped impedance resonators (SIRs) with open-stub resonators for application in wireless systems. Coupled SIRs are used to establish a dual-band frequency response in the architecture. A change in the size of the lines connecting the middle section to side open-stub resonators ensure provision of an approximately constant first-frequency, while shifting the second one toward the higher frequencies. Simulation results show central frequencies of 2.45 GHz and 5.02 GHz.

Keywords:

Bandpass Filter (BPF) , Stepped Impedance Resonators (SIRs) , open-stub resonators , half-wavelength SIR