SF1131B

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Frequency - Center:	266.01MHz
Bandwidth:	500kHz
Insertion Loss:	12dB
Ratings:	--
Applications:	GPS
Mounting Type:	Surface Mount
Package / Case:	10-SMD, No Lead
Height (Max):	0.079" (2.00mm)
Size / Dimension:	0.276" L x 0.197" W (7.00mm x 5.00mm)

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SAW Filters

Surface acoustic wave (SAW) filters are one of the most commonly used radio frequency (RF) filters, offering a wide variety of passbands and attenuation characteristics with high power handling and minimal insertion loss. By utilizing the mechanical characteristics of a SAW, these filters are capable of maintaining a consistent performance over a wide range of operating temperatures and environmental pressures. One such example is the SF1131B SAW filter, which features a linear passband with a narrower 0.3 dB passband width and low insertion loss.

SF1131B

The SF1131B SAW filter is designed for applications requiring a small size and linear passband. This filter is based on a traditional surface acoustic wave (SAW) technology and can easily be adapted to operate with a wide range of radio frequencies (RFs). The size of the filter is extremely compact, measuring 1.7 × 0.7 × 0.25 inches, and its maximum operating temperature is 125°C. It is also highly durable, able to withstand corrosive or signal-distorted environments with ease.The filter\'s linear passband is the result of its highly unique design which includes an array of piezoelectric quartz elements that are embedded in a rigid substrate material. These elements capture and transmit the RF signal, forming a line of waves that travel along the surface of the substrate material. This wave-like motion creates a frequency-selective filter, allowing only the desired frequencies to pass through.

Working Principle

The selection of desired frequencies is based on the SAW filter\'s piezoelectric materials. These materials convert the RF signals into mechanical waves that travel across the device\'s surface. When these waves reach the edges of the device, they expand radially, creating a density gradient. This density gradient acts as a filter, allowing only certain signals with the required frequency range to pass through. The SF1131B has a passband of 2.45GHz to 2.75GHz, and the stopband of 2.2GHz to 2.7GHz. This difference between the passband and the stopband dictates the filter\'s bandwidth, which is determined by the density gradient of the filter elements. To ensure a consistent performance, the filter is constructed from quartz and other materials with high piezoelectric coefficient, allowing it to effectively convert electrical signals to mechanical waves with minimal loss. The filter is also designed to be highly durable and resistant to environmental factors. By utilizing quick lead times for orders as well as excellent temperature characteristics, the SF1131B is ideal for a small size and linear passband. The in-carbon isolation and strong anti-EMC properties are also effective in environments where EMC is present, effectively ensuring the reliability of the device.

Conclusion

The SF1131B SAW filter is a small, highly reliable filter which is ideal for a wide range of radio frequency applications. By utilizing the unique characteristics of piezoelectric materials, the SF1131B is capable of providing a linear passband with minimal attenuation and excellent temperature characteristics. The filter is also designed to be highly durable, suitable for environments with corrosive or signal-distorted elements. With a passband of 2.45GHz to 2.75GHz and a stopband of 2.2GHz to 2.7GHz, the SF1131B is perfect for applications requiring a small size, linear passband, and high power handling.

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