+ Post New Thread
Results 1 to 2 of 2
  1. #1
    Newbie level 1
    Points: 52, Level: 1

    Join Date
    May 2019
    Posts
    1
    Helped
    0 / 0
    Points
    52
    Level
    1

    How to set port in microstrip BPF SMD module?

    For a typical planar microstrip BPF, port settings were not a problem.
    Click image for larger version. 

Name:	Snap3-.gif 
Views:	3 
Size:	28.6 KB 
ID:	154050
    However, when trying to design this filter for SMT, it is difficult to set the port.

    Attach a picture of SMD Type 50 ohm transmission line type.

    Thank you for your help.

    •   AltAdvertisement

        
       

  2. #2
    Advanced Member level 5
    Points: 14,456, Level: 29

    Join Date
    Apr 2014
    Posts
    2,256
    Helped
    903 / 903
    Points
    14,456
    Level
    29

    Re: How to set port in microstrip BPF SMD module?

    The discontinuity at the feed - including the transition from external microstrip to the short via at the moduel edge - could be relevant. I would co-design (EM simulate) the module including the PCB it is attached to, using microstrip feed on that PCB, and then reference shift the ports so that the refence plane is at the module edge. This way, you include the effect of all those transitions.



--[[ ]]--