B39202B4168U410

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Surface acoustic wave (SAW) filters are essential components in the modern communications industry due to their ability to provide selective signal filtering with constant group delay. The B39202B4168U410 is an example of a SAW filter, and features excellent selectivity and low insertion loss. This article provides an overview of its application field and working principle.

Application Field

The B39202B4168U410 is primarily used in mobile networks and microwave radio systems. In mobile networks, the filter is often employed to suppress interfering frequency components from being transmitted, as well as to limit the noise generated. This helps to extend the range and reception quality of mobile communication signals. Additionally, the B39202B4168U410 is used for frequency selection and interference suppression in microwave radio systems.

Working Principle

SAW filters function based on the unique acoustic properties of quartz. Different frequencies cause different traveling wave patterns on the surface of the quartz, so by etching a precise pattern on the quartz substrate, it is possible to allow certain frequencies to pass while blocking the others. This etching pattern is the filter\'s “resonator”, and consists of several interdigital transducers coupled by reflective potentiashields.

The working principle of the B39202B4168U410 is similar to the typical one for SAW filters, but the details of the resonator structure gives it high selectivity and reduced group delay. The unique SAW Resonator consists of five layers: a ground electrode, a signal electrode, an input-output region, signal reflectors, and a suppression electrode.

The signal electrode passes the signals while the ground electrode and suppression electrodes help to reject undesirable frequencies. The input-output region is a unique design which enables improved input and output impedance matching, while the signal reflectors serve to reduce the group delay. The amplitude and frequency of the filter will depend on how finely tuned each of these layers have been etched onto the quartz substrate.

Conclusion

The B39202B4168U410 is a SAW filter used primarily in mobile networks and microwave radio systems. It features excellent selectivity and low insertion loss, mainly due to a unique five-layer resonator designed to have high suppression and improved input-output impedance matching with reduced group delay. By understanding its application field and working principle, engineers can make informed decisions on when to use the B39202B4168U410 in place of other SAW filters.

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