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Miniature SAW filters designed for RKE applications

Posted: 18 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:saw filter? ndk? nihon dempa kogyo? wf866b0315ch? wf866a0433ch?

Designed specifically for front-end selectivity in transmitter (Tx) or receiver (Rx) remote keyless entry (RKE) applications, the new series of SAW (surface acoustic wave) filters from Nihon Dempa Kogyo Co. Ltd (NDK) are housed in a miniature 3.8-by-3.8mm hermetically sealed ceramic surface mount package with a maximum height of 1.2mm.

These SAW filters are available in three popular center frequencies. These include 315MHz (WF866B0315CH), 433.92MHz (WF866A0433CH), and 868.35MHz (WF873A0868CK), which make them suitable for Ultra High Frequency (UHF), Industrial Science Medical (ISM) or Short Range Device (SRD) applications. The new devices provide a low minimum insertion loss of 2.5dB to 3dB (typ), which improves efficiency. The company also said the devices exhibit excellent out-band rejection to protect radio signals.

In addition, the SAW filters are extremely stable over their operating temperature range, said the company. The operating temperature range is -40C to 125C for the WF866B0315CH, -40C to 105C for the WF866A0433CH, and -40C to 85C for the WF873A0868CK.

Meeting rigorous automotive environmental requirements, these devices may be used in automotive keyless entries or immobilizers as well as in building security systems.

The WF866A0433CH device, packaged on tape and reel, is priced at approximately $1 each in quantities of 10,000. Delivery is 12 weeks, and qualified engineering samples may be ordered at no cost.

- Gina Roos

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