Momentum: port positioning problem
时间：03-26
整理：3721RD
点击：
Dear all,
I am working on a simple model of differential coupled line.
There are 2 tracks of metal on a FR-4 substrate, with ground layer.
The goal is to put excitation not at the edge of the track, but as a touching probe, inside the conductor.
I am trying to compare results from 2 different ways:
- A) using Internal ports: I can define probes everywhere I want, there's a ground plane.
- B) using differential ports: as I can only define differential probes on the edge of a conductor, for each track I put a via line, and another small rectangular metal layer, and place my two differential ports components.
So the stack layer would be as it:
Port ->?--
Cond__|____________
FR4_ OOOOOOOOOOOO
GND_XXXXXXXXXXXXXX
The height of the via i about 1 micron, as the thickness of the port metal layer. The Cond layer is about 25 microns, FR-4 is 1mm.
I define port impedance, 50 ohms, then simulate with Momentum, create component, and use the component in ADS.
As I get different results from S11 (modulus and phase, about ~3dB and ~10°), I would like to be sure the best option would be to use Internal ports.
Do you have a few advices, informations, tricks ?
Thanks you
I am working on a simple model of differential coupled line.
There are 2 tracks of metal on a FR-4 substrate, with ground layer.
The goal is to put excitation not at the edge of the track, but as a touching probe, inside the conductor.
I am trying to compare results from 2 different ways:
- A) using Internal ports: I can define probes everywhere I want, there's a ground plane.
- B) using differential ports: as I can only define differential probes on the edge of a conductor, for each track I put a via line, and another small rectangular metal layer, and place my two differential ports components.
So the stack layer would be as it:
Port ->?--
Cond__|____________
FR4_ OOOOOOOOOOOO
GND_XXXXXXXXXXXXXX
The height of the via i about 1 micron, as the thickness of the port metal layer. The Cond layer is about 25 microns, FR-4 is 1mm.
I define port impedance, 50 ohms, then simulate with Momentum, create component, and use the component in ADS.
As I get different results from S11 (modulus and phase, about ~3dB and ~10°), I would like to be sure the best option would be to use Internal ports.
Do you have a few advices, informations, tricks ?
Thanks you
I would like to know what simulation software you use?
ADS Momentum, sorry I should have been more specific.
Regards