B39941B8606P810S5

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Introduction to SAW Filters

A Surface Acoustic Wave (SAW) filter is an electronic device that is designed to allow specific frequencies of radio waves to be received. They are primarily used as a part of receiver systems or in radio transmitters for frequency filtering. The use of SAW filters is mainly used in communications electronics such as in cellular phones and satellite TV receivers, where precise signal selection is necessary.

SAW filters exploit the piezoelectric effect of certain materials. This effect, when applied to a piezoelectric substrate, causes a vibration or acoustic waves on the surface of the material when a potential is applied to it. This vibration creates an electric field on the surface of the material and thus acts as a filter, providing signal frequency discrimination.

B39941B8606P810S5 application field and working principle

The B39941B8606P810S5 is a low-pass SAW filter with a 50-ohm impedance that has been designed for use in radio communications. It is especially suitable for use in applications such as cellular phones, GPS receivers, Wi-Fi modems, land mobile radio modules, RFID tag readers, and various wireless communication platforms.

The working principle of the B39941B8606P810S5 SAW filter can be explained using the principles of acoustics. The filter is designed to allow specific frequencies of radio waves to be received while blocking other frequencies. The filter consists of several layers of interdigitated transducers (IDTs), which are made from a piezoelectric material such as quartz. These layers are electrically connected to each other and act as a capacitor, allowing some frequencies to pass and blocking others. When the filter is activated, an electric field causes the quartz to vibrate, creating acoustic waves on the surface of the material. The acoustic waves selectively pass specific frequencies while blocking others.

The B39941B8606P810S5 SAW filter also has a few other important specs to note, such as its passband ripple, unwanted signal rejection, and input/output isolation. It has a passband ripple of 0.2dB, meaning that attenuation is most uniform across the chosen passband range. It also has excellent unwanted signal rejection, which eliminates frequencies outside the desired range. Finally, it has very good input/output isolation, meaning that the signal attenuation is within the required range.

Conclusion

In conclusion, the B39941B8606P810S5 SAW filter is a versatile device that can be used for communications electronics such as cellular phones and satellite TV receivers. It uses the piezoelectric effect of certain materials and is composed of several layers of interdigitated transducers. The filter works by providing signal frequency discrimination and blocks unwanted signals outside the desired range.

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