[Amps] tuning bandpass filters

Tom McDermott tom.mcdermott4 at yahoo.com
Mon Jan 21 12:11:23 EST 2008


Dan:

The reflective bandpass filter reflects signals in the stop band (poor return loss
in the stopband). The stopband is the inverse of the passband, where the filter
is transmissive. Absorptive filters do exist, but they are not common for ham use
(an absorptive filter absorbs signals in the stopband).

One good way to tune a bandpass filter that is composed of coupled resonators
is Dishal's method.  Here's a good link to the approach:

http://www.johansontechnology.com/technicalnotes/dbf/

    -- Tom, N5EG


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