SF2137E Filters

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Surface Acoustic Wave (SAW) filters are an effective system for meeting the needs of modern communications technology. Application of SAW filters to the telecommunications industry not only cuts costs, but also makes it possible to design small and lightweight systems with high efficiency. Through the correct usage of SAW filters, communication system designers can achieve maximum performance within their system’s allocated bandwidth. SF2137E is one such SAW filter that is widely used in telecommunication networks.

The SF2137E is a highly efficient SAW filter that is designed to work with other electronic components to provide low pass, high pass, band pass, and rejection filter solutions. It is constructed with multiple layers of thin film components and operates at a center frequency of around 2.7GHz. The filter is designed to provide maximum rejection and minimal loss in the range of 2.7GHz to 3.7GHz, while providing low and flat insertion loss in the pass band 2.5GHz to 3.5GHz. The filter is also designed such that it does not experience a prohibitive amount of variation over temperature.

The SF2137E is an integral part of the front end circuitry of a wireless communication device. It works together with filters such as antenna selection filters, baseband filters, and other components to construct a receive or transmit front end. Its main purpose is to provide a frequency-selective switching mechanism which allows for strong blocking or passing of signal according to the pass band and reject band set by the specifications. Its highly efficient response also helps to prevent interference from adjacent channels as well as enhance the performance of the receiver or transmitter.

The working principle of SF2137E is based on the use of piezoelectric transducers present in its substrate to generate elastic waves, which propagate across the surface of the substrate in the form of acoustic waves. These acoustic waves interact with the array of fingers that are printed onto the substrate and multiply or reflect the shifted waves, in order to achieve desired frequency performance. The waves eventually reach a pair of reflectors located at opposite sides of the filter, and are reflected to come back to the transducers.

The reflected waves, after passing the filter, will be either blocked or passed. In case of the blocked wave, the acoustic wave is locked in the finger array and dissipates in the form of heat, leading to a high damping of the wave. When the wave is passed, the finger array does not absorb much of the wave, allowing it to pass through with minimal losses.

The SF2137E is an excellent choice for providing strong performance and a cost-efficient solution for modern communications. It not only offers efficient filtering and minimal signal losses, but is also suitable for high-speed applications, since it does not experience any major variation over temperature. With its wide pass band and high rejection capabilities, it is an essential component in modern communication systems.

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