SF2155B

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SAW filters are considered as one of the essential components of modern electronic circuitry for their usability in applications like mobile frequencies, satellite communication, radar transmission, and so on. The SF2155B model of SAW Filter is specifically designed to work in the frequency range between 400MHz and 2.7GHz. It is a single channel filter that utilizes closely coupled quarter wave inter-digital electrodes on one side and complies with the industry standard of GSM1800 specification.

The SF2155B SAW Filter is composed of a stopped waveguide - which is also known as a half-wavelength resonant cavity – and two pairs of interdigited transducers that are arranged on the top and bottom of the waveguide. It also has a comb-line frequency selector at the center of the waveguide to further adjust the filter characteristics. This filter works due to the combined effect of the stopped waveguide and the quarter-wave phase-shifting networks provided by the inter-digital transducers on both side. The main purpose of using this SAW filter is to pass the signal at the corresponding frequency and to remove all the signals that are not at the defined frequency.

The SF2155B model is particularly useful for GSM1800 applications as it offers an out-of-band attenuation that\'s greater than 45dB till 2GHz. It also provides high selectivity for rejecting the unwanted signals at other frequencies. The filter has a low insertion loss of 2dB or less in the passband. In addition, this filter also offers high-impedance up to 4KΩ.

The SF2155B model is a very popular type of SAW filter due to its performance, cost and insertion loss. It has become an essential device for applications ranging from wireless telephony to broadcasting in several countries. It is also widely used in a variety of GPS automotive and medical applications, as well as in satellite communication and radio navigation systems. All of these systems utilize the SF2155B model to effectively remove unwanted signals at non-defined frequencies for effective communication.

The working principle of SF2155B relies on the combination of the stopped waveguide design and the quarter-wave phase shifting networks that are provided by interdigited transducers on both side. This allows the passband signal to pass through the filter while rejecting the signals that are not at the designed frequency. It also utilizes a comb line frequency selector for further trimming of the filter characteristics.

The SF2155B SAW Filter is an ideal choice for its usability in GSM1800 applications, its high-performance, low insertion loss, high impedance, and wide range of applications. The working principle behind this filter includes the implementation of the stopped waveguide and the phase-shifting networks to pass the desired signals and reject the unwanted ones. This makes it an essential device for a wide variety of applications in communication, navigation and other modern electronic circuitry.

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