Device and method for cascading filters of different materials

A method for fabricating a filter comprising:

• cascading at least one first filter, each first filter being a band-reject type filter having a first set of filter parameters that are a function of a first material used to fabricate the respective first filter, together with at least one second filter, each second filter having a second set of filter parameters that are a function of a second material used to fabricate the respective second filter, each second filter being one of:
• a band-reject type filter;
• and
• a band pass type filter;
• wherein the first material and the second material are different materials;
• wherein the filter has a third set of filter parameters that are a function of both the first material and the second material:
• and
• wherein the first material has a smaller magnitude temperature coefficient than the second material, such that each first filter of the at least one first filter has less temperature dependent frequency drift than each second filter of the at least one second filter.

A method for filtering a signal comprising:

• providing a signal to an input of a first filter, the first filter being a band-reject type filter having a first set of filter parameters that are a function of a first material used to fabricate the first filter;
• filtering the signal using the first filter thereby producing an output of the first filter;
• providing the output of the first filter to a second filter, the second filter having a second set of filter parameters that are a function of a second material used to fabricate the second filter, the second filter being one of a band-reject type filter and a band pass type filter;
• filtering the output of the first filter using the second filter thereby producing an output of the second filter;
• wherein the first material and the second material are different materials;
• wherein the combination of the first filter and the second filter has a third set of filter parameters that are a function of both the first material and the second material;
• and
• wherein the first material has a smaller magnitude temperature coefficient than the second material, such that each first filter of the at least one first filter has less temperature dependent frequency drift than each second filter of the at least one second filter.