SAW filter
Surface acoustic wave (SAW) devices are an important class of piezoelectric devices, providing frequency control, frequency selection, and signal processing capabilities. SAW devices have many diverse applications, with the various types of SAW devices including filters, resonators, delay lines, correlators and the like. Surface acoustic wave (SAW) filters, in particular, play a key role in telecommunications. Surface acoustic wave (SAW) filters with resonant structures are used extensively for radio frequency (RF) filtering in wireless communication systems due to the small chip size and low insertion loss that can be realized in such filters. They have been widely used as bandpass and spectrum-shaping filters in mobile and wireless applications. Other applications for SAW filters currently available include wide area network (WAN), wireless local area network (WLAN) communications, cordless phones, pagers and satellite communications. In a mobile telecommunication system involving those portable telephone devices, the transmit band and the receive band are situated very close to each other. So as to avoid crosstalk between transmitted signals and received signals, a transmit filter is required to suppress the receive band, and a receive filter is required to suppress the transmit band. Compared with any other filter device, a SAW filter normally exhibits a sharper cut-off profile in the vicinities of the pass band. However, there is an increasing demand for SAW filters with a greater degree of suppression. A surface acoustic wave filter has features such as compactness, high stability, high precision, high reliability, and no need for adjustment, and is widely used as a functional element for controlling an RF signal in an optical communication device and mobile communication device. For example, the SAW filter is used as a functional element such as a frequency selection element, filter element, resonator, and delay element. The SAW filter controls an electrical RF signal through a surface acoustic wave propagating on the surface of the base material. As the base material, a piezoelectric material such as rock crystal, LBO, lithium tantalate, or lithium niobate is generally used. The surface acoustic wave filters used in the RF stage, in particular, include a ladder filter having resonators connected in a ladder configuration and a longitudinal mode filter utilizing a mode through acoustic coupling. The transversal surface acoustic wave filters are characterized in that the ground delay time deviation curve is flat, and the attenuation near the pass band is sufficient. Accordingly, the transversal surface acoustic wave filters are suitable for use as IF filters.
SAW filter product listings
Oscilent designs and manufactures IF and RF SAW Filter products and solutions for wireless applications including GPS, PCS, PCN, CDMA, Wireless LAN, GMS, CATV, Bluetooth, keyless entry, and other datacom, handset, and broadband commercial and military/aerospace applications.
Oscilent develops and manufactures a complete line of IF SAW Filter Products utilizing industry standard packages in both Surface Mount and Through Hole designs.
Oscilent develops and manufactures a complete line of RF SAW Filter Products utilizing industry standard packages in both Surface Mount and Through Hole designs.
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