What filter type should I select for such bandpass filter design?

Status
Not open for further replies.
H

huvarda

Junior Member level 3
Joined
Apr 21, 2003
Messages
27
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
abd
Activity points
229
Hi,
I would like to design a bandpass filter. Center frequency is 400MHz and bandwidth is 40MHz. Insertion loss will not be greater than 1dB. Rejection will be 50dB in the rejection band, 0-360MHz and 465-1000MHz. What is the best suitable filter type (LC, Combline, Interdigital....) I can realize this filter in as small package as possible?
Your help will be appreciated.
 

Re: Bandpass Filter

LC type is the only option you have all others are to bulky due to low frequency (400MHz) and high PCB cost since you demand a low insertion loss....
 

Re: Bandpass Filter

PaulHolland said:
LC type is the only option you have all others are to bulky due to low frequency (400MHz) and high PCB cost since you demand a low insertion loss....
Click to expand...

what order and topology of filter do you guess that I can achieve these specs?
 

Bandpass Filter

What about cascading a low pass and high pass filters as the ratio 40/400 seems to be little bit large.
 

Re: Bandpass Filter

I think achieving both reject band and insertion loss at the passband is difficult in lowpass+ highpass filter arrangement. Size, as you said, will be big too.
 

Re: Bandpass Filter

What is the max. power passes through the filter ?

< 1W : use dielectric filter, small, cheap and easy to implement.

Rogerynt
 

Re: Bandpass Filter

use lc filter. Easy to design & assemble.
 

Re: Bandpass Filter

Do you know any off-the-shelf dielectric filters which work around 400MHz? How I will choose these resonators to build a filter meeting these specifications?
Thanks rogerynt
 

Re: Bandpass Filter

I just looked at the insertion loss plot of the helical filter you suggested me. That helical filter doesn't give me the rejection I need unfortunatelly.
 

Bandpass Filter

hi.
To design a Band pass filter with lumped element you can use capacitive coupling method. For this u can refer Mathai's Book.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…