Dear All,

   I have one question about the antenna design and its matrix file.

   Usually the exported file of antenna is .s1p, it means it is only one-port device. If I want to import the antenna into Cadence use N2port to simulate. Then I will need a two-port device (input port and output port).

   Does anybody know how to design an antenna with the S-paramter matrix as two-port device .s2p ? Or maybe convert the .s1p to .s2p format?

   Thank you very much!

Jack

I think your post is not design issue but no more than usage of simulator.
And completely same question is included in your another post.
http://www.designers-guide.org/Forum/YaBB.pl?num=1255340427

Jack wrote on Oct 23^rd, 2009, 8:50am:
What do you mean by "Cadence" ?
Use correct terminologies with full description.
Even if you mean ADE of Cadence, there are many simulator engines available in Cadence ADE.

Why do you want to use s2p in antenna design even if you include LNA ?
I don't think s2p is not needed at all since you don't study RX/TX link budget. Your concern is only RX.

Jack wrote on Oct 24^th, 2009, 5:12am:
I don't think any remarkable challenge is required in your needs.
And what do you mean by "invert the S11" ?

"s1p" is an output impedance of antenna since a common antenna is reciprocal.
Your need is to implement this output impedance as port's impedance.

Usually open voltage(EMF Voltage) or power delivered to 50ohm load is specified for RX antenna.
Do you understand a definition of antenna gain surely ?
Antenna gain is relative value where gain is defined as comparison with reference antenna.

If you use Agilent ADS or RFDE, use "P1_Tone" and "DAC" components in "adsLib" where you can specify both available power and port impedance as table.
Here you have to convert s1p to z1p. In this environment, you can specify EMF voltage or available power correctly even if EMF voltage or available power is frequency dependent and a real part of impedance is not constant regarding frequency.

If you use Agilent GoldenGate or Cadence Spectre, invoke series connection of "vsource" and "n1port" components in "analogLib".
It is almost impossible to specify EMF voltage or available power correctly in this environment since EMF voltage or available power is frequency dependent and a real part of impedance is not constant regarding frequency.