1
Paul D Bradley, John D Larson III, Richard C Ruby: Duplexer incorporating thin-film bulk acoustic resonators (FBARs). Agilent Technologies, Ian Hardcastle, July 17, 2001: US06262637 (177 worldwide citation)

An FBAR-based duplexer that comprises a first port, a second port, a third port, a first band-pass filter connected between the first port and the third port and a series circuit connected between the second port and the third port. The first band-pass filter includes a first ladder circuit having s ...


2
Paul D Bradley, Donald Lee, Domingo A Figueredo: Resonator with seed layer. Agilent Technologies, December 7, 2004: US06828713 (140 worldwide citation)

A thin-film resonator having a seed layer and a method of making the same are disclosed. The resonator is fabricated having a seed layer to assist in the fabrication of high quality piezoelectric layer for the resoantor. The resonator has the seed layer, a bottom electrode, piezoelectric layer, and ...


3
Richard C Ruby, Ronald S Fazzio, Hongjun Feng, Paul D Bradley: Acoustic resonator performance enhancement using alternating frame structure. Avago Technologies Wireless IP, June 17, 2008: US07388454 (113 worldwide citation)

Disclosed is an acoustic resonator that includes a substrate, a first electrode, a layer of piezoelectric material, a second electrode, and an alternating frame region. The first electrode is adjacent the substrate, and the first electrode has an outer perimeter. The piezoelectric layer is adjacent ...


4
Richard C Ruby, John D Larson III, Paul D Bradley: Bulk acoustic resonator perimeter reflection system. Agilent Technologies, July 23, 2002: US06424237 (89 worldwide citation)

A bulk acoustic resonator having a high quality factor is formed on a substrate having a depression formed in a top surface of the substrate. The resonator includes a first electrode, a piezoelectric material and a second electrode. The first electrode is disposed on the top surface of the substrate ...


5
Richard C Ruby, John D Larson, Paul D Bradley: Method for fabricating an acoustical resonator on a substrate. Avago Technologies Wireless IP, October 2, 2007: US07275292 (84 worldwide citation)

Method for fabricating an acoustical resonator on a substrate having a top surface. First, a depression in said top surface is generated. Next, the depression is filled with a sacrificial material. The filled depression has an upper surface level with said top surface of said substrate. Next, a firs ...


6
Richard C Ruby, Paul D Bradley, John D Larson III: Method of mass loading of thin film bulk acoustic resonators (FBAR) for creating resonators of different frequencies and apparatus embodying the method. Agilent Technologies, October 22, 2002: US06469597 (83 worldwide citation)

A method for fabricating a resonator, and in particular, a thin film bulk acoustic resonator (FBAR), and a resonator embodying the method are disclosed. An FBAR is fabricated on a substrate by introducing a mass loading electrode to a bottom electrode layer. For a substrate having multiple resonator ...


7
John D Larson III, Paul D Bradley, Richard C Ruby: Method of providing differential frequency adjusts in a thin film bulk acoustic resonator (FBAR) filter and apparatus embodying the method. Agilent Technologies, November 19, 2002: US06483229 (79 worldwide citation)

A method for fabricating a resonator, and in particular, a thin film bulk acoustic resonator (FBAR), and a resonator embodying the method are disclosed. An FBAR is fabricated on a substrate by mass loading piezoelectric (PZ) layer between two electrodes. For a substrate having multiple resonators, o ...


8
John D Larson III, Richard C Ruby, Paul D Bradley: Method of providing differential frequency adjusts in a thin film bulk acoustic resonator (FBAR) filter and apparatus embodying the method. Agilent Technologies, May 20, 2003: US06566979 (78 worldwide citation)

A method for fabricating a resonator, and in particular, a thin film bulk acoustic resonator (FBAR), and a resonator embodying the method are disclosed. A resonator is fabricated on a substrate, and its top electrode


9
Kun Wang, Paul D Bradley, Richard C Ruby, Hongjun Feng: Acoustically coupled thin-film resonators having an electrode with a tapered edge. Avago Technologies Wireless IP, August 29, 2006: US07098758 (76 worldwide citation)

Acoustically coupled resonators include a first and a second acoustic resonator. Both the first and second acoustic resonators include a first electrode, a layer of piezoelectric material, and a second electrode. The first electrode is adjacent a first surface of the layer of piezoelectric material. ...


10
Richard C Ruby, John D Larson III, Paul D Bradley: Method for making thin film bulk acoustic resonators (FBARS) with different frequencies on a single substrate and apparatus embodying the method. Agilent Technologies, September 9, 2003: US06617249 (76 worldwide citation)

A method for fabricating a resonator, and in particular, a thin film bulk acoustic resonator (FBAR), and a resonator embodying the method are disclosed. An FBAR is fabricated on a substrate by introducing a mass loading top electrode layer. For a substrate having multiple resonators, the top mass lo ...