| US 7,579,926 B2 | ||
| FBAR band pass filter, duplexer having the filter and methods for manufacturing the same | ||
| Jaemyoung Jhung, Seoul (Korea, Republic of) | ||
| Assigned to Mems Solutions Inc., Gyeonggi-do (Korea, Republic of) | ||
| Appl. No. 10/545,613 PCT Filed Feb. 21, 2004, PCT No. PCT/KR2004/000362 § 371(c)(1), (2), (4) Date Aug. 16, 2005, PCT Pub. No. WO2004/075402, PCT Pub. Date Sep. 02, 2004. |
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| Claims priority of application No. 10-2003-0011180 (KR), filed on Feb. 22, 2003. | ||
| Prior Publication US 2006/0139121 A1, Jun. 29, 2006 | ||
| Int. Cl. H03H 9/54 (2006.01); H03H 9/70 (2006.01) | ||
| U.S. Cl. 333—133 [333/189] | 4 Claims |
| 1. A duplexer of a mobile communication device comprising:
a transmitting band pass filter, formed on an upper portion of a substrate, having at least two FBARs (Film Bulk Acoustic
Resonators) electrically connected to each other;
a receiving band pass filter, formed on the upper portion of the substrate, having at least two FBARs electrically connected
to each other; and
a phase shifter electrically connected with the transmitting band pass filter and the receiving band pass filter, the phase
shifter comprising an inductor electrically connected to the FBARs of the transmitting and receiving band pass filters and
a capacitor disposed adjacent the inductor, the capacitor having an upper electrode,
wherein the FBARs have upper electrodes that are thinner than the upper electrode of the capacitor.
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