B39941B9814P810S5

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Introduction to SAW Filters

Surface acoustic wave (SAW) filters are devices that can filter or modify the frequency spectrum of an input signal. In telecommunication, SAW filters are used to reduce interference and noise while allowing users to receive satisfactory transmission signals. SAW filters are mostly used in mobile reception, satellite and land line communication systems, radio frequency (RF) and wireless local area network (WLAN) applications.

Application Field and Working Principle of B39941B9814P810S5

The B39941B9814P810S5 is a high performance SAW filter designed for use in GPS systems, land mobile communication systems and digital DECT phones. It is a low-power, high speed duplexer SAW filter with a center frequency of 805 MHz. This device can be used for applications such as direct conversion receivers and other applications requiring a narrow in-band-notch filter and a narrow transition band. The B39941B9814P810S5 delivers high bandwidth in a small package and is ideal for small form factors.

The B39941B9814P810S5 is a SAW resonator type duplexer where the input-output signals are coupled through radiation and are processed in the horizontal and vertical directions. The device achieves a low insertion loss, wide transmission band, and shaping of electromagnetic wave in a receiver. The B39941B9814P810S5 is also designed with a wide bandwidth for signals below 1.7GHz. A network of resonators and reflecting layers is also included in the device to provide useful characteristics. The reflecting layers separate the horizontal and vertical signals and limit the noise.

The working principle of B39941B9814P810S5 can be explained by examining how the filter works. The filter employs a piezoelectric material as a resonator to form a reflective waveguide, which passes acoustic wave along a wire structure. The waveguide acts as a reflecting filter where high frequency signals above a certain frequency excites surface waves along the filter. It uses energy damping from the surrounding media to reduce the amplitude of the surface wave. This reduces the signal level at the output of the filter and prevents unwanted signals from passing light through the filter.

Another working principle used by the B39941B9814P810S5 is the use of a microstructured surface, which utilizes the principle of wave propagation in a relatively thin medium. This type of structure is usually used in thin film or MEMS applications. The microstructure allows the filter to suppress a narrow band of frequencies determined by the filter design.

Conclusion

The B39941B9814P810S5 SAW filter offers mobile reception, satellite communication system, RF and WLAN applications a non-volatile, low power, low insertion loss, and wide transmission band. Moreover, the filter employs numerous working principles like surface wave propagation, waveguide resonators and micro-structured surface, which reduce the amplitude of the signal and prevent unwanted frequencies from passing through the filter. This makes it a reliable device that allows users to receive satisfactory transmission signals.

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