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Two-In-One SAW Filter For GPS Applications

Thu, 08/30/2001 - 9:29am
AVX Corp. has combined two filters into a single space-saving package for use in portable Global Positioning System (GPS) applications. These Surface Acoustic Wave (SAW) filters, designated the SF Series, combine a front-end filter with an interstage filter in single package (3.80 × 3.80 × 1.25 mm), thus reducing volume by 75% and weight by 80% when compared to typical specifications for two individual filters.

Combining the two filter elements into one package not only saves space, but also gives the system the front-end filter's low insertion loss (0.9 dB typ.), and the high selectivity associated with the interstage filter's attenuation characteristic (30 dB min.) The device also exhibits excellent isolation characteristic (40 dB min.) among two-filter elements.

The SF Series devices offer a compact dual SAW filter for design engineers of portable GPS applications. The filter's excellent isolation characteristic (40dB min.) provides ideal high frequency performance for personal communications systems. Applications include use in GPS cellular phone applications, GPS system cards, and Handy GPS Systems.

The SF Series SAW filter features a 1575.42 MHz center frequency with 3 MHz passband for both front-end filter and interstage filter. The miniature SF Series SAW Filter is sold on tape-and-reel packaging. This filter is also compatible with automated assembly equipment and reflow soldering techniques.

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