"Is the insertion loss typically 10dB
      for only a three element filter?"


Ummmm ... typically, generally or always?

Jut off the cuff, this sounds AWFULLY
HIGH - but I don't know anything about
the application of the implementation
of the filter.

I just went though the design process of
several diferent filters (LP, HP, BS) at
low frequencies (1.8 MHz and below) using
E-Syn and didn't anything like the kind of
IL's you're seeing. Since all filters
can be scaled for frequency - I could have
just as easily been doing work at just under
1.8 GHz ...

I could, during the design, specify such
parameters as 'ripple in the passband' so
perhaps your filters were designed for
such high IL's?

Jim


----- Original Message -----
From: "Sean H. Breheny" <shb7@CORNELL.EDU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, March 26, 2002 10:44 PM
Subject: Re: [EE]: Two quick RF questions


> Hi Peter,
>
> Thanks for the quick reply. Is the insertion loss typically 10dB for only
a
> three element filter? If so, why do I see boards with 5 and 6 sections in
> them! Wouldn't the loss be prohibitive?
>
> Sean
>
> At 12:39 AM 3/27/02 +0000, you wrote:
> >I think you don't stand much of a chance of getting the loss lower, and
> >would have thought it to be more than 10 if your tuning for a 3.2 ~ 3.7
> >pass
> >Band I would be happy to see only 7db if all the elements were tuned to
> >the same frequency.
> >  To get less IL you could couple the elements tighter but it wouldn't be
> >much good as a filter.
>
> --
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>

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