B39921B3705Z810

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Surface acoustic wave (SAW) filters are electronic filters used in telecommunications that are based on the acoustic properties of a piezoelectric material. SAW filters are used to select or reject frequencies in a wide-band radio frequency (RF) signal. The B39921B3705Z810 is an example of a SAW filter that can be used in applications such as RF receivers and transmitters, base station receivers, television receivers, and data communication systems. In this article, we will discuss the B39921B3705Z810’s application field and working principle.

The B39921B3705Z810 is a single band SAW filter that is used to select signals in the frequency range between 885 and 1220 MHz, making it ideal for a variety of applications. For example, it can be used in television receivers to reject interference in the UHF band, or in RF receivers and transmitters for filtering communications signals in the 900 MHz range. Additionally, the B39921B3705Z810 can be used in modern data communication systems such as Wi-Fi and Bluetooth, as well as in various satellite broadcasting applications.

The B39921B3705Z810 is an example of a narrow-band filter, meaning that it can reject signals that are outside of the specified frequency band. It utilizes two kinds of acoustic transducers which are engraved on a piezoelectric substrate. The first type of transducer is called an input transducer, which converts the incoming RF signal into an acoustic wave. The second type of transducer is called an output transducer, which converts the acoustic wave into an output RF signal.

The B39921B3705Z810 also utilizes two interdigital transducers which are utilized to enhance the selectivity of the filter. These IDTs are etched onto the piezoelectric material and create an interference pattern which is used to further concentrate the acoustic waves. The IDTs also act as capacitors which enable the filter to create a reverberation of constructive and destructive interference at certain frequencies. This determines the cut-off frequency of the filter, allowing it to reject unwanted frequencies while letting desired frequencies pass through.

To implement the B39921B3705Z810, designers must connect an RF connector to the input and output pins. Additionally, a DC voltage must be supplied to the bias pins in order to bias the piezoelectric substrate. The DC voltage can be adjusted for desired performance, as different voltages will create different resonance frequencies within the SAW filter.

In conclusion, the B39921B3705Z810 is a single band SAW filter that can be used in a variety of applications. It utilizes two types of acoustic transducers, as well as two interdigital transducers which are used to increase its selectivity. The filter has an input and output of 885-1220 MHz, and must be supplied DC voltage in order to be properly biased. This is an example of how the B39921B3705Z810 can be used in a wide array of applications.

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