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Help with CPW Patch Antenna Port Setup

Question asked by midosi on Jul 17, 2014
Latest reply on Jul 25, 2014 by volker_muehlhaus
So I had to rephrase my problem due to lack of replies...

I am very new to ADS. I am trying to simulate a patch antenna in the ISM range (2.4 GHz). I am not sure if my ports are setup correctly. A few examples I found do not use explicit ground reference pins. But it feels like we need them because we remove the infinite ground plate. When I design an antenna example that someone else did, I dont get anything similar. Please help
I am also receiving these warnings:

--- WARNING -------------------------------------------------------------------

The 2D port solver data is not available, 
using default values (50 Ohm) for the transmission line parameters.

--- WARNING -------------------------------------------------------------------

The size of the plus pin for S-parameter port 1 is electrically large 
above 9.19695 GHz, S-parameters may become unphysical.

-------------------------------------------------------------------------------
--- WARNING -------------------------------------------------------------------

The size of the minus pin for S-parameter port 1 is electrically large 
above 9.19695 GHz, S-parameters may become unphysical.

-------------------------------------------------------------------------------
--- WARNING -------------------------------------------------------------------

The distance between the layout pins for port 1 is electrically large 
above 3.53729 GHz, S-parameters may become unphysical.


I am using ADS 2014. Substrate is Polyimide with er: 3.5 and tanD: 0.003. Thickness is 25 microns (1 mil)
Conductor has a conductivity of 6e4 Siemens/m and a thickness of 1 micron
I don't have an infinite ground plate at the back, instead I have CPW grounds at each side of the transmission line.

Dimensions (mm): 

Antenna Block: 20 x 20 
Transmission Line: 6 x 8
CPW: 10 x 5.6
Gap CPW/Transmission: 1
Gap CPW/Antenna: 2

I have attached port configuration and etc... My pins are line/area type

Any help is greatly appreciated. I need to have error free simulations so I can make parameter study and fabricate an antenna for analysis.

I also think that phase results feel odd. Any comments on that?

Dogan

Edited by: midosi on Jul 18, 2014 7:37 AM  

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