Control of Bandwidth and Resonant Frequency of a New Coplanar Bandpass Filter

This paper presents the design of a new compact end-coupled bandpass filter (BPF). This structure is based on coplanar waveguide (CPW) lines and lambda/4 resonators. Both the bandwidth and the matching can be easily controlled by changing the dimensions of the components of the filter. The structure has been implemented for the bands 2.5-7.6 GHz and 1.7-5.2 GHz. The electromagnetic and equivalent-circuit simulations are in good agreement with the measurements.