Multi-resonator filters

A method of manufacturing a multi-resonator filter having a multi-resonator bandpass response that corresponds to a series resonator bandpass response of an existing resonator filter having a plurality of individual resonators coupled in series between a signal input and a signal output, the method comprising:

• a) identifying at least one of the individual resonators in the plurality of individual resonators as a potentially risky resonator when the at least one individual resonator satisfies a filter risk criteria;
• and
• b) providing a multi-resonator signal input terminal;
• c) providing a multi-resonator signal output terminal;
• d) coupling an input resonator component to the signal input terminal;
• e) coupling an output resonator component to the signal output terminal;
• and
• f) coupling at least one intermediate resonator component between the input resonator component and the output resonator component to define a signal path between the signal input terminal and the signal output terminal, the at least one intermediate resonator comprising a given intermediate resonator component corresponding to each of the individual resonators of the existing resonator filter;
• wherein the given intermediate resonator component corresponding to each potentially risky resonator comprises a multiple resonator component, each multiple resonator component including a pair of individual resonators coupled in parallel with each individual resonator in a given pair of individual resonators has the same resonant frequency;
• and
• each of the input resonator component, the output resonator component and the at least one intermediate resonator component comprises a resonant wave-guiding structure configured to transmit electromagnetic signals.

A multi-resonator filter comprising:

• a) a signal input terminal;
• b) a signal output terminal;
• and
• c) a plurality of resonator components comprising an input resonator component coupled to the signal input terminal, an output resonator component coupled to the signal output terminal, and at least one intermediate resonator component coupled between the input resonator component and the output resonator component;
• wherein
• the input resonator component, output resonator component and the at least one intermediate resonator component are arranged in a sequence to define a signal path between the signal input terminal and the signal output terminal;
• the at least one intermediate resonator component comprises at least one multiple resonator component, each multiple resonator component including a pair of individual resonators coupled in parallel wherein each individual resonator in a given pair of individual resonators has the same resonant frequency;
• the at least one intermediate resonator component comprises a first intermediate resonator component and a second intermediate resonator component coupled in sequence from the first intermediate resonator component to the second intermediate resonator component;
• the first intermediate resonator component is one of the multiple resonator components;
• and
• the input resonator component is cross-coupled with the second intermediate resonator component.