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SAW Filters Overview

Surface Acoustic Wave (SAW) filters are widely used in various wireless communication applications. SAW filters are employed as frequency-selective devices to discriminate and separate out the incoming signal from other signals in the same frequency range.

SAW filters are packed with several advantages that make them ideal for various applications. Firstly, SAW filters have very high performance in terms of low insertion loss, high selectivity, and wide frequency bandwidth. Secondly, due to their physical characteristics, SAW filters are small in size and thus occupy less space on the circuit board. Lastly, SAW filters have extremely low power consumption and very low intermodulation distortion.

B39389K2955M100 Application Field and Working Principle

The B39389K2955M100 SAW filter is a standard component used in mobile communication application and has an immense range of application due to its robustness in performance. It is a filter in the 900MHz range and provides an operating frequency of 890-960MHz; it has 2.1dB insertion loss, 19dB stop band attenuation, and a temperature range of -50 to +85 degree Celsius. The filter is fully compatible with 3GPP Release 5 and also passes the stringent Automotive AEC-Q100 requirements.

The B39389K2955M100 filter works on the principle of Surface Acoustic Wave technology and consists of piezoelectric substrate, surface wave transducers, and metallic interdigital transducers. The substrate is composed of crystalline material such as gallium arsenide, quartz, and aluminum nitride with electrodes patterned and integrated on the surface. The transducers consist of interdigital electrodes that convert electrical signals into surface acoustic waves and vice versa.

The filter also consists of accessible electrodes, which are placed at points to provide a smooth transition of the wave from one electrode to another. As the ultimate aim of the filter is to isolate the signal from other signals in the same frequency range, the accessible electrodes are designed to give the electrical filters a higher selectivity for better performance and accuracy. These electrodes also help to reduce the size of the SAW filter without making any significant changes in its accuracy.

Conclusion

The B39389K2955M100 SAW filter is a robust device designed for excellent performance and accuracy in mobile communication applications. Its features such as low insertion loss, high selectivity, wide frequency bandwidth, and low power consumption make it the ideal choice for various applications. With its surface acoustic wave technology, the B39389K2955M100 filter also has accessible electrodes to ensure smooth transitions of the wave between different electrodes and reduce the size of the filter without compromising its accuracy.

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