Abstract: A duplexer including an FBAR band pass filter that can be easily embodied in single chip, and a method for manufacturing the same are disclosed. The duplexer of a mobile communication device includes a transmitting band pass filter, formed on an upper portion of a substrate, having at least two FBARs electrically connected to each other, a receiving band pass filter, formed on an other side of the substrate, having at least two FBARs electrically connected to each other, and a page shifter electrically connected with the transmitting band pass filter and the receiving band pass filter. Since the transmitting and receiving band pass filter and the inductor can be integrated into one chip, a duplexer with minimized size can be provided in response to the request of miniaturization and lightness of various mobile communication device.

Abstract: A thin film resonator having enhanced performance and a manufacturing method thereof are disclosed. The thin film resonator includes a supporting means, a first electrode, a dielectric layer and a second electrode. The supporting means has several posts and a supporting layer formed on the posts. The first electrode, the dielectric layer and the second electrode are successively formed on the supporting layer. The thin film resonator is exceptionally small and can be highly integrated, and the thickness of the dielectric layer of the resonator can be adjusted to achieve the integration of multiple bands including radio, intermediate and low frequencies. Also, the thin film resonator can minimize interference and has ideal dimensions because of its compact substrate, making the thin film resonator exceptionally small, yet comprising a three-dimensional, floating construction.