Filter with improved intermodulation distortion characteristics and methods of making the improved filter

A filter comprising:

• a plurality of resonators coupled together, at least two of said plurality of resonators are selected having known different values of intermodulation IP and at least two of said plurality of resonators are selected having known different values of Q, said resonators being coupled in series, wherein said resonators in series comprise a first resonator, said first resonator being the resonator to first encounter an input signal and having a high Q value and a high IPn value.

A method for filtering electronic signals comprising the step of:

• increasing a known IP of one or more resonators in said filter that have the most effect on the intermodulation-distortion products of the filter.

A method for filtering electronic signals comprising:

• decreasing a known Q of one or more resonators in said filter that have the least effect on insertion losses of the filter.

A filter comprising:

• a plurality of resonators coupled together, at least one of the plurality of resonators being a HTS resonator, and at least two of said plurality of resonators having known different values of unloaded Q, at least two of said plurality of resonators have known different intermodulation intercept point values and wherein said resonators are coupled in series and said known different unloaded Q values and intermodulation intercept point values are selected so as to reduce intermodulation distortion.

A filter according to 48, wherein the filter is selected from the group consisting of a band-pass filter, a high-pass filter, and a low-pass filter.

A filter comprising:

• a plurality of resonators coupled together, at least one of the plurality of resonators being a HTS resonator, wherein a first resonator of the plurality of resonators is selected to have a high intermodulation intercept point value.

A filter comprising:

• a plurality of resonators coupled together, at least one of the plurality of resonators being a HTS resonator, wherein one of the plurality of resonators is selected to have a high intermodulation intercept point value.

A method for reducing intermodulation distortion in a filter caused by out-of-band signals, comprising the steps of:

• selecting a plurality of resonators such that at least two of the resonators have different intermodulation intercept points and at least one of the plurality of resonators is a HTS resonator, and
• coupling the plurality of resonators.

A filter comprising:

• a plurality of resonators coupled together, at least one of the plurality of resonators being a HTS resonator, wherein a first resonator of the plurality of resonators is selected to have a high intermodulation intercept point value and the filter is selected from the group consisting of band-pass filters, high-pass filters, and low-pass filters.

A filter comprising:

• a plurality of resonators coupled together, at least two of the plurality of resonators having known different values of unloaded Q and at least two of the plurality of resonators having known different intermodulation intercept point values, the plurality of resonators being coupled in series, wherein the unloaded Q values and the intermodulation intercept point values are selected so as to reduce intermodulation distortion, and wherein the filter is selected from the group consisting of a band-pass filter, a high-pass filter, and a low-pass filter.

A filter comprising:

• a plurality of resonators coupled together, at least two of said plurality of resonators are selected having known different values of intermodulation IP and at least two of said plurality of resonators are selected having known different values of Q, said resonators being coupled in series, wherein said resonators in series comprise a first resonator, said first resonator being the resonator to first encounter an input signal and having a high Q value and a high IPn value.