AFS20A05-1672.50-T2 Filters

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Surface acoustic wave (SAW) filters are essential components in modern electronic systems, and AFS20A05-1672.50-T2 is a typical example. This article will focus on the application fields and working principle of the filter.

Applicaiton fields

AFS20A05-1672.50-T2 SAW filter precicely finds its use in mobile communication systems. Specifically, it is often used as part of the duplexer in the mobile base station and mobile handset. In the base station, AFS20A05-1672.50-T2 SAW filter is installed between the transmitter and receiver, thus effectively blocking the reciprocal waves between them. As for the mobile handset, this filter is used to block the waves from the appliances and other electronic gadgets nearby. And in this way, it can make sure that the desired signal reaches the receiver intact without being disturbed.

Working Principle

Surface acoustic wave (SAW) filters work by reflecting acoustic signal from the surface of an acoustic substrate. AFS20A05-1672.50-T2 SAW filter is an LTCC (Low Temperature Cofired Ceramics) filter, which utilizes the acoustic surface waves to achieve higher frequency selectivity and the multi-layer ceramic substrate to reduce cost and size. The filter works in the following way:

When an EM wave impinges on the filter, it is converted into an acoustic wave. This wave then propagates on the substrate surface, and when it reaches the two electrodes on the edge of the filter, it is reflected back. The reflected wave then travels back along the surface. Depending on the frequency of the EM wave, it may constructively combine with the wave that is already in the medium, thus enhancing the signal strength. This is the “resonance” effect. Similarly, if the frequency of the EM wave does not match the frequency of the wave in the medium, the two will interfere destructively with each other, thus suppressing the signal.

In addition to this, the filter also features a predetermined transmission coefficient for each frequency that passes through it, thus creating a peak and a null within the frequency range. This allows users to selectively filter some frequencies while cutting out others. The transmission coefficient can also be tailored to modify the filter characteristic.

Conclusion

To conclude, AFS20A05-1672.50-T2 SAW filter is a compact, low-cost filter which makes great use of surface acoustic waves. It is designed for efficiently blocking the reciprocal waves between the transmitter and receiver in mobile base station and mobile handset. It works by reflecting acoustic signal from the ceramic substrate, thus creating selective frequency passband and suppressing unwanted signals. This article has provided an insight into the application and workings of this filter, and it is hoped that this knowledge can help users make an informed decision when selecting the correct filter.

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