B39162B4327P810 Filters

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Surface Acoustic Wave (SAW) filters are electronic circuits that rely on sound waves to filter out unwanted noise in radio frequency (RF) signals. The B39162B4327P810 is one such filter from the B39x series of SAW filters manufactured by EPCOS. This chip is designed to filter signals in the 869-870MHz ISM loop-band, including those in Global System for Mobile communications (GSM) networks.

The B39162B4327P810 consists of a continuous metallic strip laminated onto a quartz crystal plate. When electrical current is applied to the metallic strip, it produces a surface acoustic wave (SAW) which propagates along the strip. As the wave propagates, it resonates due to the quartz crystal’s crystal lattice structure and creates a resonance frequency. At the same time, the resonating wave creates an electromagnetic field to a parallel, closely spaced meander line. This meander line generates an exactly opposite wave to cancel out the incoming signal at certain frequencies.

The B39162B4327P810 is most commonly used in cellular base station radios, broadband Internet access systems, radios for wireless local area networks (WLANs) and wireless personal area networks (WPANs). It is also used in other applications that require low-loss operation in the 869-870MHz frequency range. Moreover, this filter can eliminate undesired out-of-band signals and reduce the channel noise preprogrammed by the user.

In terms of its working principle, the B39162B4327P810 utilizes the two principal characteristics of SAW filters: mechanical resonance and the fringing electric field. It begins with an acoustic wave entering the structure, which is then converted into a series of mechanically-resonating resonators. As the wave travels through these resonators, its resonance frequency is established. This resonance frequency varies with different positions along the meander lengths, thus allowing for the exact frequency to pass through while rejecting signals at undesired frequencies. Furthermore, the fringing electric field imparts further selectivity, thus allowing for a tight removal of undesired frequencies.

In conclusion, the B39162B4327P810 is a SAW filter designed for use in the 869-870MHz ISM loop-band, including GSM networks. It is commonly used for cellular base station radios, broadband internet access systems, and wireless personal area networks. Its working principle takes advantage of two main characteristics of SAW filters: mechanical resonance and the fringing electric field to eliminate out-of-band signals and reduce channel noise.

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