Therefore, we characterise the symmetric T-network and Π-network by attenuation
rather than by gain.Attenuation in absolute value is given by e
α
. However, it has become
customary in filter engineering to specify attenuation in dB (decibel) units.
Thus, the attenuation in dB units in a two-port network is directly proportional to the
real part of its propagation constant. This explains why the real part (
α
) of
γ
is called the
attenuation constant. The unit of ‘neper’ is sometimes used for
α
.
16.10 CONSTANT-k LOW-PASS FILTER
We commence our discussion on passive filters designed using symmetric reactive two-
port networks from this section onwards. The ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
Julian F.
Head of Cybersecurity
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.
Addison B.
Field Engineer
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.
Amir M.
Data Platform Tech Lead
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.