Multiple frequency acoustic reflector array and monolithic cover for resonators and method

A radio frequency filter system, comprising:

• a first acoustic resonator for a first frequency;
• a second acoustic resonator for a disparate second frequency;
• an acoustic reflector array coupled to an electrode of the first acoustic resonator and to an electrode of the second acoustic resonator;
• and
• the acoustic reflector array including a plurality of reflector layers, at least one of the reflector layers configured to reflect a first signal at substantially the first frequency and at least one of the reflector layers configured to reflect a second signal at substantially the second frequency and the reflector layers each reflecting a disparate frequency and incrementally changing from the first frequency to the second frequency.

A single-chip front end transceiver for a wireless device, comprising:

• a receive filter including an acoustic resonator corresponding to a first frequency of the receive filter;
• a transmit filter including an acoustic resonator corresponding to a disparate second frequency of the transmit filter;
• an image rejection filter including an acoustic resonator corresponding to the first frequency of the receive filter;
• a voltage controlled oscillator filter comprising an acoustic resonator corresponding to a disparate third frequency of the voltage controlled oscillator filter;
• an acoustic reflector array coupled to an electrode of each of the acoustic resonators;
• and
• the acoustic reflector array comprising a plurality of reflector layers and including a first reflective layer operable to reflect signals at substantially the first frequency, a second reflective layer operable to reflect signals at substantially the second frequency, and a third reflective layer operable to reflect signals at substantially the third frequency.

A method for fabricating multiple frequency filter system, comprising:

• forming an acoustic reflector array including a plurality of reflector layers operable to reflect a first signal at substantially a first frequency and to reflect a second signal at substantially a disparate second frequency;
• forming a first acoustic resonator for the first frequency on the acoustic reflector array;
• forming a second acoustic resonator for the second frequency and coupled to the acoustic reflector array;
• and wherein the reflector layers are each operable to reflect a signal at a disparate frequency and incrementally change from the first frequency to the second frequency.

A single-chip front end transceiver for a wireless device, comprising:

• a receive filter including an acoustic resonator corresponding to a first frequency of the receive filter;
• a receive filter including an acoustic resonator corresponding to a first frequency of the receive filter;
• a transmit filter including an acoustic resonator corresponding to a disparate second frequency of the transmit filter;
• a voltage controlled oscillator filter comprising an acoustic resonator corresponding to a disparate third frequency of the voltage controlled oscillator filter;
• an acoustic reflector array coupled to an electrode of each of the acoustic resonators;
• a substrate;
• and
• the acoustic reflector array comprising a plurality of reflector layers and including a first reflective layer operable to reflect signals at substantially the first frequency, a second reflective layer operable to reflect signals at substantially the second frequency, and a third reflective layer operable to reflect signals at substantially the third frequency, the first, second and third reflective layers have different thickness and the thickest of the reflective layers is located furthest away from the acoustic resonators and the thinnest of the reflective layers is located closest to the acoustic resonators.