SF1120B_1

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SAW Filters are the most widely used components in the filter field due to their extremely simple structure and high selectivity. In particular, the SF1120B_1, which is produced by Various Filters Co., Ltd., has gained high reputation for its mature technology and excellent product quality.

Application field

The SF1120B_1 is specially designed to filter Dual-Band signals with the frequency range of 880MHz~960MHz & 1710MHz~1800MHz. It is widely used in the field of mobile communication, such as LR11, GPRase, and CDMA/PCS. This filter can therefore effectively reduce the interfering signals from other bands while maintaining an extremely low insertion loss and high out-of-band rejection. In addition, this filter also has an impaired phase noise and can be readily employed in GPS systems and spectrum analyzers without causing any interference.

Working Principle

The working principle of the SF1120B_1 is based on SAW (Surface Acoustic Wave) technoloGY. When an electronic signal passes through the SAW filter, it is converted into an acoustic wave, which can be transformed into an electrical wave, thereby filtering out the signals outside the frequency band of interest and only passing through the desired signals. In order to perform the filtering operation, the SF1120B_1 contains a piezoelectric substrate, an interdigital transducer, and a flat polished plate. The structure of the SAW filter is made up of four main layers: The IDT layer, the reflective layer, the substrate layer and the protective layer.

The IDT consists of a set of transducer fingers, and is charged with an electric charge to transfer the signal between the two electrodes. The signal passing through the IDT is then converted to a Surface Acoustic Wave (SAW). The reflective layer is used to control the signal transmission by reflecting and refracting the signal to create the necessary range of frequencies. The substrate layer consists of a piezoelectric crystal lattice which works with the reflective layer to select the desired frequency range. Finally, the protective layer acts as a shield for the filter.

In conclusion, the SF1120B_1 from Various Filters Co., Ltd. is a dual band filter which uses SAW technology to effectively filter out signals outside the frequency range of 880MHz~960MHz & 1710MHz~1800MHz and is widely used in mobile communication. It has a mature technology, excellent product quality, low insertion loss and high out-of-band rejection while providing an impaired phase noise for GPS and spectrum analyzers.

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