EFCH2140TCA1 Filters

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Surface Acoustic Wave (SAW) filters are a type of band-pass filter widely used in a variety of telecommunication applications. They are based on piezoelectric transducers which generate and receive acoustic waves when electrical signals are applied. SAW filters consist of a multilayer structure in which acoustic waves propagate along the surface of the substrate material. The structure contains several interdigital transducers (IDTs), which are composed of an array of metal fingers separated by a gap. The alternating spacing of the fingers cause the acoustic waves to interact in a variety of ways, such as reflections and diffraction. In addition, there are several other components of the filter such as reflectors, absorbers, and coupling networks.

The EFCH2140TCA1 is a SAW filter designed by the company GSI. This filter is designed for the GSM850/GSM900/DCS1800/PCS1900 bands with a center frequency of 2.14GHz. It is composed of four IDTs, a reflector on one side, and an absorber on the other. The filter has an excellent passband response, with a maximum insertion loss of less than 3dB at its center frequency.

The working principle of the EFCH2140TCA1 is based on the same principles as other SAW filter designs. It utilizes the interference between the acoustic waves generated by the IDTs to provide filtering characteristics. This interference is caused by the difference in the frequency of the incident and reflected waves. The reflected waves, in turn, depend on the composition of the substrate, as well as the spacing of the finger conductors on the IDT. The combination of these factors results in the filter’s passband. Additionally, the reflector and absorber are used to control the return loss characteristics of the filter, as well as to reduce the overall loss of the signal.

The EFCH2140TCA1 has many applications, such as in cellular base stations, satellite communication systems, and wireless LANs. It is also used in a variety of testing and measurement applications, such as spectrum analyzers and signal generators. Its small size and excellent passband response make it an ideal choice for these types of applications.

In summary, the EFCH2140TCA1 is a type of SAW filter designed for the GSM850/GSM900/DCS1800/PCS1900 frequency bands. It is based on the standard principles of SAW filter design, utilizing acoustic interference between the IDTs, and using the reflector and absorber to control the passband characteristics. The filter has a wide range of applications, making it an ideal choice for various telecom and testing/measurement applications.

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