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From: "Tom Faloon"
Subject: Re: Asymmetrical frequency response of lumped element bandpass filters
Date: Mon, 14 Oct 2002 20:22:12 +0100
NNTP-Posting-Date: Mon, 14 Oct 2002 19:15:23 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Is you X axis linear or logarithmic ? If it is linear, you might expect to
see something like this.
The Technical Manager wrote in message
> 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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