B38781W1134W310

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Surface Acoustic Wave Filters (SAW Filters) are designed to provide frequency-selective filtering of electronic signals. In their simplest form, they are constructed by depositing a piezoelectric material (such as quartz or a polysilicon-based film) onto a substrate material (such as aluminum nitride (AlN)). The piezoelectric material will vibrate at a specific frequency under an applied electrical field, and a specified electric circuit of conductive metal tracks is etched onto the piezo material on the substrate. The patterns of etched conductive tracks and their associated capacitances form a resonator circuit.

B38781W1134W310 is an example of a SAW Filter that is designed for the application of radio frequency carrier frequency adjustment (CFA) in mobile communication systems. This filter has a center frequency of 824 MHz, a pass-band of 3 dB of 22 MHz, and a stop-band of 13 dB of 85 MHz. The performances are guaranteed over a temperature range of -40 to +85 degrees Celsius.

The B38781W1134W310 filter consists of a piezoelectric substrate, conductive metal tracks, and external components. The substrate and the conductive tracks form the resonator, which provides the required input and output impedances. The external components are used to provide capacitance compensation and impedance matching. The embodiment of a filter circuit depends on the number of elements and their position on the substrate.

The operation of the B38781W1134W310 works on the principle of wave propagation. The signal is input to the circuit in the form of an electrical field, and the output is the same electrical field, but at a different frequency. The electrical field is applied to the piezoelectric material, which causes a mechanical wave to propagate in the material. Due to the etching patterns, the wave reflections cause constructive interference at some frequencies and destructive interference at other frequencies. This causes the signal to be filtered at the specific frequency, rejecting out of band frequencies.

The B38781W1134W310 finds its application in mobile communication systems, as an IF filter, or in any system that requires Precision frequency selection. The filter is used to precisely select the desired frequency and reject unwanted frequencies. The filter may be used in an antenna or in the radio frequency (RF) section. The performance of the filter is guaranteed over a wide temperature range, making it suitable for use in extreme or changing temperature environments.

In conclusion, the B38781W1134W310 is a SAW filter designed for the application of radio frequency carrier frequency adjustment (CFA) in mobile communication systems. The filter has a center frequency of 824 MHz, a pass-band of 3 dB of 22 MHz, and a stop-band of 13 dB of 85 MHz. The performance is guaranteed over a temperature range of -40 to +85 degrees Celsius. The filter works on the principle of wave propagation, and finds application in systems that require precision frequency selection.

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