Change the length of input lines in interdigital filter

Status
Not open for further replies.

ctzof

Full Member level 3
Joined
Mar 1, 2012
Messages
157
Helped
12
Reputation
24
Reaction score
11
Trophy points
1,298
Location
Munich
Visit site
Activity points
2,516
Hello,
I have designed an interdigital bandpass filter with microwave office. The problem is that this filter must be used in a board with specific dimensions so I have to draw lines at least from one of input-output connectors to the input-output lines of the filter. Is this going to affect the functionality and-or the performance of the filter2 I am using two identical interdigital filters in this board one for the transmitter and one for the receiver (attached picture). Any ideas on how I can make this work? The board dimensions and connectors can not be changed.
 

Attachments

  • Unbenannt.png
    146.4 KB · Views: 94

Assuming a reasonable match appart from the insertion loss of PCB material and any cross coupling between the lines their length should have no effect on the filter.
 
Reactions: ctzof

    ctzof

    Points: 2
    Helpful Answer Positive Rating
G4BCH said:
Assuming a reasonable match appart from the insertion loss of PCB material and any cross coupling between the lines their length should have no effect on the filter.
Click to expand...

Thanks, this saves me from a lot of trouble!!
 

Would be no performance change only if the lines coming from the filter are 50 ohms (the same impedance as the lines coming from the SMA connectors).
Might be wrong, but I see from the picture that the lines coming from the filters are a little bit narrow, which make their impedance higher than 50 ohms.
 

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…