B39389K7257M100

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Surface acoustic wave (SAW) filters are high-performance, ultra-stable frequency control components. They operate in the microwave region and are mainly used in communications systems. The B39389K7257M100 SAW filter is manufactured by EPCOS AG and is used for various purposes. This article explains the application field and working principle of the B39389K7257M100 SAW filter.

The B39389K7257M100 SAW filter is a high-selectivity RF filter with a center frequency of 790 MHz and a bandwidth of 180 kHz (3dB). It offers excellent performance and is suitable for many wireless and telecom applications, including Bluetooth, ISM, and IEEE 802.15/16. This SAW filter is designed to be used in the frequency range from 400 to 868 MHz and can be combined with other RF components to form complete systems, such as DCS1800, GMSK, and SDMA. In addition, this filter is also suitable for mobile applications, such as GSM1800, GSM850, and GSM900.

In addition to its application field, the B39389K7257M100 SAW filter also has a wide range of working principles. In order to achieve its high selectivity, the filter consists of two major components: an RF input and output transducer, and an acoustic delay line, which serves as the main resonator. The RF transducer is essentially a piezoelectric layer, which is designed to convert the electrical signal into an acoustic wave and vice versa. The acoustic delay line then uses acoustic waveguide technology and is responsible for accurately controlling the frequency response.

The acoustic waveguide also affects the shape of the filter\'s frequency responses. The acoustic waveguide utilizes a specific type of energy-dissipating coating, which is implemented to ensure that the desired frequency selectivity is generated. This also helps to reduce excess noise that might otherwise be produced. Furthermore, a protective package is used to ensure that the SAW filter remains operational in extreme conditions. Moreover, the package is designed to provide excellent impedance matching and to minimize insertion loss.

Overall, the B39389K7257M100 SAW filter is a high-performance, ultra-stable frequency control component. It is suitable for many mobile applications, such as Bluetooth, ISM, IEEE 802.15/16, and more. The filter consists of two major components: an RF input and output transducer, and an acoustic delay line, which serve as the main resonator. The acoustic waveguide affects the shape of the filter\'s frequency responses and utilizes an energy-dissipating coating, which helps to ensure that the desired frequency selectivity is achieved. In addition, a protective package is used to ensure the SAW filter remains operational in extreme conditions and provides excellent impedance matching. With its advanced features, the B39389K7257M100 SAW filter is an ideal choice for many wireless and telecom applications.

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