Digital Logic Circuit
- General method for synthesis of quasi-elliptic bandpass filters (BPF), with prescribed attenuation poles in the stopband.
- This method generally leads to an extended coupling matrix that assumes multiple couplings between all the filter resonators.
- The extended matrix can be then reconfigured into a form suitable for practical filter realization, using similitude transformations.
- The design and the simulation of a 4-pole cross-coupled planar microwave BPF with a pair of attenuation poles at finite frequencies are presented, as an example.
- The circuit- and EM-simulated performances of this BPF show a good agreement to the specifications, validating the design method.
