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From: The Technical Manager
Subject: Asymmetrical frequency response of lumped element bandpass filters
Date: Mon, 14 Oct 2002 17:37:04 +0100
Organization: Microwave Department
NNTP-Posting-Date: 14 Oct 2002 16:37:05 GMT
X-Mailer: Mozilla 4.78 [en] (X11; U; SunOS 5.7 sun4u)
Why is it that lumped element LC bandpass filters have an asymmetrical
frequency response where the slope between the passband and stopband on
the high frequency side is less steep than the slope on the low
frequency side ? Filters constructed from distributed elements normally
have perfectly symmetrical frequency responses.
Is it something to do with the admittance vs frequency response of
distributed elements being periodic with frequency whereas the
admittance vs frequency response of an LC resonator isn't periodic with
frequency and exhibits an admittance of either zero or infinite ohms -
depending on whether it is parallel or series LC circuit - only at
DC and infinity Hz ?
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