Series:	*
Part Status:	Last Time Buy
Bandwidth:	60MHz
Insertion Loss:	2.5dB
Ratings:	--
Applications:	Cellular, WCDMA
Mounting Type:	Surface Mount
Package / Case:	9-SMD, No Lead
Height (Max):	0.018" (0.45mm)
Size / Dimension:	0.079" L x 0.063" W (2.00mm x 1.60mm)

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Introduction

Surface Acoustic Wave (SAW) filters are specialized microelectronic circuits which are used to process high-frequency signals. They are capable of rejecting signals outside of a narrowpass band while at the same time, allowing a smooth transition between the pass band and the attenuated frequencies. The B39202B8004P810 is one type of SAW filter. This article will discuss the application fields and working principles of the B39202B8004P810.

Application Fields

The B39202B8004P810 SAW filter has a wide range of applications. It is often used for cellular base stations, satellite communications, and wireless LANs. It can also be used for television broadcasting, video, and radar systems. Furthermore, it can be used in radio frequency (RF) signal processing, for example removing undesirable signals from radar and radio transmissions. The device is very flexible and therefore can be tailored to many different applications.

Working Principle

The B39202B8004P810 has a variety of functions, depending on the application in which it is used. In essence, it is a low-noise band-reject filter. It uses acoustic energy to achieve a band-stop response, attenuating signals in the pass-band while allowing signals outside the pass band to pass by unaltered.The filter features a surface-mounted acoustic wave component, which is connected to the filter’s input and output terminals. A substrate consisting of a piezoelectric material, such as quartz or glass, is used as the mechanical element of the filter. A signal is applied to the substrate, which in turn vibrates and produces an acoustic wave that propagates along the surface of the substrate.The wave is guided into the filter input, where it is modulated by an electric field. This modulated wave then propagates through the filter, and its propagation characteristics are controlled by the resonator electrodes. As the wave traverses the filter, some of its energy is subtly dissipated due to the interactions between the substrate and the filter’s electrodes.Thus, the energy of the incoming signal is modified in a manner which produces a band-pass filter response; low-frequency signals pass through with minimal modification, while high-frequency signals are attenuated. This type of filter typically has a sharp roll-off, resulting in minimal noise and distortion.

Conclusion

The B39202B8004P810 SAW filter is an invaluable component for a wide variety of applications. Its ability to thoroughly reject unwanted signals, while permitting the desired signal to pass unimpaired, makes it a key technology in many complex signal processing systems. The working principle of this filter relies on modulated acoustic waves propagating along the filter’s substrate, and the interactions between the substrate and the filter’s electrodes to achieve the desired response.

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