B39311B3713U410

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SAW Filters

SAW Filter stands for Surface Acoustic Wave Filter. It is an electronic filter used to select or reject a specific band of frequencies from the input signal. Usually, the size of SAW filter is much smaller than the traditional filter using inductors and capacitors. It bridges the gap between the high quality of Active and Passive filters.

B39311B3713U410 Application Field and Working Principle

The B39311B3713U410 is a commonly used SAW filter that has a wide application in telecommunication equipments such as CDMA base stations. It is also suitable for use in GSM systems where transmission lines are short and space is limited. The filter has a passband of 709.2 ~ 710.7 MHz, with a bandwidth of 1.5MHz and rejection of >35db.The B39311B3713U410 is an 8th order bandpass filter, which is made up of two 4th order stages. The filter has two input nodes and two output nodes, and these nodes are connected by two different path. The first path consists of an acoustic wave transducer component, which are connected to different electrodes for sound excitation and piezoelectric effect. The second path is interdigital transducer (IDT), which consist of metallic electrodes arranged between thick layers of piezoelectric material. When RF signals are applied to the filter, the acoustic wave propagates along the transducer which generates electrical signals from the piezoelectric material for further processing.

The B39311B3713U410 filter uses the reflection and transmission principle used to reject unwanted signals. The acoustic wave passes through the IDT and experience different crystal immittances, which cause the wave to be partially reflected and partially transmitted. If the immittances of both transmission line is equal, the wave will be completely transmitted. However, due to the different nature of the acoustic wave, the wave is partially reflected back to the original direction. The reflected wave is re-circulated between the electrodes, as the wave reach the IDT the effect of RF frequency is retained and therefore become stronger. This process will be repeated until the reflected frequency is completely attenuated and eventually rejected. The transmitted components that have been through the filter, will continue to propagate along the transmission line with minimal attenuation.

The performance of B39311B3713U410 can be influenced by environmental considerations such as temperature, humidity and vibration. In order to ensure stable performance in various environment, proper design of the SAW filter is essential. Advanced computer-aided design (CAD) software that uses finite element technology is available to accurately model SAW filter and enhance its performance.

In summary, B39311B3713U410 is a widely used SAW filter with application in CDMA base stations and other telecommunication equipments. It works by using the reflection and transmission principle to reject the unwanted frequency. The filter performance is greatly influenced by environmental considerations and proper design is essential to ensure its stability.

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