Sunday, December 25, 2011

Band pass and Low pass filters?

A "band pass" filter attenuates all frequencies except those in its specified range. A "low pass" filter attenuates frequencies above a specified frequency (permitting only lower frequencies to "pass"). A "high pass" filter attenuates frequencies below a specified frequency (permitting only higher frequencies to "pass").

For example, a "band pass" filter rated for 500MHz-4GHz will effectively eliminate all frequencies below 500MHz and all frequencies above 4GHz. A "low pass" filter rated at 10KHz will effectively eliminate all frequencies that are above 10KHz. A "high pass" filter rated at 70Hz will effectively eliminate all frequencies that are below 70Hz.


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