Even Order Elliptic LPF

[pancho_hideboo]

See attached figure.
This figure shows transmission Coefficient, |T(Ω)| of Elliptic LPF for order=7 and order=6.

Here, there are two problem for even order case.

(1) |T(Ω=0)| ≠ 1
(2) |T(Ω=∞)| ≠ ∞

As you know, we can not realize Even Order Elliptic LPF by L and C.

So frequency conversion is applied for original transmission Coefficient to overcome this problem.

T(Ω) -> T(ω)

However is this equivalent to an order reduction ?

Is there any practical value for Even Order Elliptic LPF of L and C ?

 

[kripacharya]

The answer seems to be NO
So move on with your life. Some things are just the way they are.

 

[pancho_hideboo]

As you know, we can not realize Even Order Elliptic LPF by L and C.
So frequency conversion is applied for original transmission Coefficient to overcome this problem.

We can get LC values for even order case with applying such frequency conversion in the following.
https://rf-tools.com/lc-filter/