SF2005B-1

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Surface Acoustic Wave (SAW) filters are typically comprised of an array of electrodes and an interdigital transducer (IDT) that are deposited on a piezoelectric substrate. These filters are used extensively in various wireless communications code division multiple access (CDMA) applications, including cellular phones. The SF2005B-1 filter is an example of a compact and low cost SAW filter used in many different types of applications.

The SF2005B-1 filter uses a quartz crystal as its energy source; it operates at 800 kHz with a center frequency of 880 MHz and a temperature compensation of 0.5 ppm/°C. The filter operates in the frequency range of 880-960 MHz, and has an insertion loss of 3.9 dB max and a rejection of 50 dB min at the two half power points. It is designed with a high Q and low insertion loss, and can provide a wide range of filter parameters depending on the application. The filter also has a wide range of phase stability, as well as a low group delay variation.

In terms of its application field, the SF2005B-1 filter is used in CDMA and GSM handset applications. It can be used for GSM 850, 900, 1,800 and 2,100 MHz; and CDMA 850, 1,400 and 1,900 MHz applications. This filter also has the capability to be used in multi-band handset applications. It can simultaneously filter multiple frequencies while maintaining low insertion loss and high rejection. The SF2005B-1 filter can be used in mobile phones, wireless LAN and access points, base stations, cable TV systems, and many other wireless communication applications.

In terms of its working principle, the SF2005B-1 filter uses a pair of IDTs in conjunction with a piezoelectric substrate to create a SAW filter. The IDT electrodes are responsible for launching the SAW from the IDT onto the substrate. The SAW then travels along the substrate. Meanwhile, a SAW stop band is formed and oscillates between the two IDT electrodes. The oscillations are inversely affected by the distance between the two IDT electrodes, and this will affect the frequency response of the filter. By adjusting the distances between the two IDT electrodes, it is possible to create a filter with the desired frequency response.

The SF2005B-1 SAW filter is a compact and low cost filter that is used in many different types of wireless communication applications. It uses a pair of IDTs in conjunction with a piezoelectric substrate to create a SAW filter, and is capable of providing a wide range of filter parameters based on the application. It is used in CDMA and GSM handset applications, as well as in multi-band handset applications.

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