Microstrip filter with suppression of spurious-bands

A method of the suppression of spurious bands in the amplitude-frequency response of the filters containing micro-strip resonators with the coupling performed by lumped inductances has been proposed. It has been suggested to eliminate spurious bandpass in the amplitude-frequency response of the microstrip filters. It has been achieved by substitution the electromagnetic coupling using lumped inductances connected to the resonators in certain points. This has been simulated in the one-dimensional approximation and confirmed by experiment.