Sonnet - How to simulate a LOGP antenna?
How can I simulate LOGP antenna in SONNET, I have version 10.52
I cannot seem to get the port right:
The specs are:
A simple PCB LOGP design, 4 elements, FR-4, 1.6mm, operting at 915MHZ with a bandwidth of about 5MHZ.
My design look something like this
Box is 1024x1024mm
Air at top and bottom
then FR4 1.6mm then another FR4 layer 1.6mm to draw the top and bottom elements, this bothers me I feel the bottom FR-4 is not right, as double sided FR4 is not supported in SONNET ? So do I maybe make the second layer only 0.035mm of copper
Now for the ports: LogP`s have one array of elements drive and the other elements are "grounded"
The theory would be that port 1 and -1 be used.... but that I can`t seem to get working.
Waiting for an answer ?
With your Sonnet Professional version 10.52, you can stack multiple dielectrics. No problem!
Of course, there could still be a problem with the settings that you have used.
In new Sonnet versions, you can use ports +1/-1 with floating ground.
In your old version 10.52, use one internal port that is sitting between two polygons. This creates a differential signal between these two polygons.
For your antenna, you have much air above and below, so that port-deembedding might fail. Better switch OFF port de-embedding in the analysis settings.
A general thought: the LOGP will fire to the side, in direction of the box side wall. You will not get correct results, because the MoM formulation assumes that you have a substrate of infinite size that extends to the horizon. Calculated gain is not correct exactly at the horizon (=substrate/air interface).
[QUOTE]
In new Sonnet versions, you can use ports +1/-1 with floating ground.
In your old version 10.52, use one internal port that is sitting between two polygons. This creates a differential signal between these two polygons.
/QUOTE]
Hi there
Thanks for the reponse,
OK you lost me on this point, there are 2 layers forming the LPDA elements, one on layer 1 and one on layer 2, the center poly extends a bit so this is where the ports must go, so where shall I put the port on layer 1 or layer 2, layer 1 is the driving port, layer 2 is the "ground" layer...
Then use a "via port".
Ok Understand, however when I try that I get a warning:
"Port 1 has no access to ground"
I cannot seem to disble EMBEDDING ? it is greyed out in my version and is always enabled..
I only have a Gold Level 3 license
Tx Ben
Then it is not recognized as a via port, and Sonnet thinks you have placed an internal port to the edge of a polygon.
To create a viaport, draw a via and then place a port onto the via. The port symbol will then be shown at the bottom end of the via. Maybe you can have a look at the User's Guide, to see how the via port should look like.
Not a problem in this case, because via ports are not de-embedded anyway. You can leave the default setting.