B39871B3571U310

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Surface Acoustic Wave (SAW) filters are passive, linear devices used for frequency-selective filtering. Single-device SAW components can include one or several SAW filters, with each SAW filter usually providing multiple transmission zero points for either bandpass or bandstop functions. The B39871B3571U310 application field and working principle SAW filter is a high-performance device with excellent stopband suppression, steep skirts, and low group delay variation.

The B39871B3571U310 is an octave-band band-stop SAW filter, particularly suited for use in mobile radio applications, where it is used to eliminate guardband interference or suppress excessive out-of-band unwanted signals. The B39871B3571U310 SAW filter design has two transmission zero points, with one transmission zero point at the filter center frequency and one transmission zero point at 0.707 times the center frequency. This transmission zero point at 0.707 times the center frequency provides superior stopband suppression performance.

The B39871B3571U310 also exhibits excellent stopband rejection and excellent return-loss performance. The filter’s maximum insertion loss is typically 0. 0dB which produces a minimum trace level of 53 dB at the center frequency, ensuring that the filter can reduce the peak level of interfering signals to an acceptable level. The filter also has low group delay ripple, typically within ±0.2nsec.

The working principle of a SAW filter is based on piezoelectric transduction, where an incoming acoustic wave stimulates a voltage on metal electrodes. The wave is generated by an interdigital transducer (IDT) which has a specific periodic structure of metal electrodes. This structure creates an acoustic resonance field and provides the signal selectivity for the filter. The signal path of the filter is defined by two IDTs separated by an acoustic delay line.

The acoustic field generated by the IDTs is split into two parts, one traveling in each direction of the delay line. As it travels down the line, the wave is successively reflected at each end; the phase of the reflected wave and its amplitude are changed on each reflection, thus leading to the evolution of the wave as it propagates. This effect creates a set of standing waves between the two IDTs, with each wave having its own phase and amplitude. The reflection of the signal passing through the filter is changed according to these standing waves.

The performance of the B39871B3571U310 SAW filter is very high, with stopband attenuation peaking at 70 dB and out-of-band attenuation up to 50 dB. The insertion loss is low, typically 0. 0 dB, and group delay variation is small, with a maximum of ±0.2nsec. This excellent performance is achieved by the use of an IDT structure with a finger-to-gap ratio of 8.8 and a specific dampening scheme that enables higher stopband attenuation with a minimal increase in insertion loss.

In conclusion, the B39871B3571U310 SAW filter is an excellent device for use in mobile radio applications. It is designed to provide excellent stopband rejection and return-loss performance, with low group delay ripple and low insertion loss. The filter is suitable for use in a variety of applications, such as in frequency-hopping radios, guardband elimination, and suppression of out-of-band signals.

The specific data is subject to PDF, and the above content is for reference