B39921B3588U410 Filters

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Surface Acoustic Wave (SAW) filters are electronic filters that are relying on acoustic waves travelling on the surface of a piezoelectric substrate. The B39921B3588U410, a miniature SAW filter, is specifically designed for applications where small size and high rejection for spurious signals are essential.

The filter consists of one or two substrate layers of high stable ceramic material, typically AT-cut quartz. On the upper layer of the SAW Filter, a pattern of interdigital transducers is etched in order to launch and detect the acoustic wave. The patterned electrodes create a set of sharp frequency notches, which are responsible for the desired frequency selection.

The B39921B3588U410 is designed to be used in cellular communication systems, such as GSM, CDMA, and WCDMA. Its high suppression, from 65dB to 80dB, and small size meet the use of small, compact cellular phones. It is also suitable for frequency conversion between GSM, CDMA and WCDMA, providing transmission of the selected frequency band and also filter out the spurious signals.

The working principle of the B39921B3588U410 SAW Filter is based on the interference and combination of two acoustic waves travelling in opposite directions on the surface of the substrate. The two waves are generated by interdigital transducers located on the upper face of the substrate. These transducers convert the RF signal into an acoustic wave. The acoustic wave is split into two waves travelling in opposite directions. Each wave is incident on the next transducers, which act as detectors, and is converted into electrical energy or the input RF signal.

The two waves are affected by the shape of the substrate and the characteristics of the transducers. This will produce interference between the waves, known as constructive and destructive interference. When the outcoming signals interfere they form a combined signal whose shape and frequency depend on the substrate’s characteristics and the distribution of the transducers on its surface. The B39921B3588U410 SAW Filter uses this principle to create sharp frequency notches in the outcoming signal, which are used as a filter to cut out the undesired frequencies.

In addition, the B39921B3588U410 is highly reliable because of the robust nature of the quartz substrate. Its consistent performance across temperature, humidity and atmospheric pressure, as well as its low susceptibility to external noise make it an ideal choice for applications where frequency selection and spurious rejection is essential, such as cellular communication systems.

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