SF25-0881M5UB02

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SAW Filters

Surface acoustic wave (SAW) filters are used in a variety of electronic devices and communications systems. These devices manipulate high frequency sound waves that are generated by transducers, or acoustic transducers, and propagate along the surface of a substrate material. SAW filters are used to select particular frequency ranges and help suppress unwanted signals. The SF25-0881M5UB02 is an example of a SAW filter.

Application Field

The SF25-0881M5UB02 is applied in mobile communications, such as cellular phones, Bluetooth devices, and Wi-Fi networks, as well as broadcast receivers, digital audio players, and AM/FM receiver systems. It can also be used for navigation receivers, as its bandpass characteristic works for performing location tracking. This filter is also suitable for RFID systems and wireless security applications.

Working Principle

The SF25-0881M5UB02 operates on the principle of a SAW resonator. This type of filter is made up of as many as dozens of interdigital transducers (IDT) that form an interdigitated metal structure. The metal structure is placed on top of a piezoelectric substrate such as quartz, lithium niobate, or aluminum nitride. The IDT produces an electric field across the substrate, causing acoustic wave motion. As the surface acoustic wave passes through the interdigital transducers, its frequency is amplified. The filter then passes only a certain frequency range to the receiver, while the other frequencies are attenuated.

Advantages

SAW filters offer significant advantages over other filters such as lumped element filters and LC filters. Their relatively small size makes them ideal for many modern electronics devices and communications systems. They also feature high selectivity, low insertion loss, and high rejection performance, making them useful in applications requiring accurate signal processing and filtering.

Conclusion

The SF25-0881M5UB02 is a SAW filter that is used in a variety of applications, including mobile communications, broadcast receivers, digital audio players, and RFID systems. It utilizes the principle of a SAW resonator, which produces an electric field across a piezoelectric substrate and amplifies a certain frequency range while attenuating other frequencies. SAW filters offer many advantages such as small size and high selectivity, making them valuable components in modern electronics devices.

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