Jack wrote on Oct 12th, 2009, 2:40am:I have checked some references, it seems HFSS cannot simulate the active circuits (am I right?).
Right.
Jack wrote on Oct 12th, 2009, 2:40am:So I have to export the antenna from HFSS, then import it into Cadence.
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.
Jack wrote on Oct 12th, 2009, 2:40am:1. How can I export the antenna from HFSS, in which file format, it can match with cadence?
Again there are many simulator engines available in Cadence ADE.
However if you mean Cadence Spectre, "Citi File" Format or "Touchstone" Format is available even in Cadence Spectre.
Jack wrote on Oct 12th, 2009, 2:40am:2. If I add the antenna into cadence successfully, how should I build the testbench, because usually we use the port as the input, but if antenna is in the front of LNA, which kind port should be in the front of antenna (should the port with series resistor, like 50ohms)?
Jack wrote on Oct 12th, 2009, 6:14am:Third, assume the antenna component is added into the cadence, how to add the signal source to simulate the antenna with LNA ? Because for LNA, we can use the "port" from cadence analoglib, but if antenna is in front of LNA, which kind port I can use to start the simulation.
See
http://www.designers-guide.org/Forum/YaBB.pl?num=1256313008/2#2Jack wrote on Oct 12th, 2009, 2:40am:3. Compare HFSS with ADS, which one can give the easier solution?
Do you undertstand Agilent
ADS surely ?
If you compare Ansoft HFSS with Agilent's Products, you have to pick up EMPro(EMDS, AMDS) and Momentum not ADS.
For antenna application, Agilent AMDS is suitable than Ansoft HFSS or Agilent EMDS.
If your antenna is a planar one such as patch antenna, Momentum is suitable.
Jack wrote on Oct 12th, 2009, 6:14am:In HFSS, as I know, I can export the return loss (S11), the impedance, and the antenna gain.
Do you have basic knowledge of RF circuit theory surely ?
S11 is completely equivalent to impedance.
Have you been able to understand the following ?
http://www.designers-guide.org/Forum/YaBB.pl?num=1234783833/12#12Jack wrote on Oct 12th, 2009, 6:14am:First, is there an component in Cadence can import these 3 parameters (S11, gain, impedance) at the same time to perform the characteristics as an antenna?
Jack wrote on Oct 12th, 2009, 6:14am:Second, antenna just has S11 parameter, it doesn't have S21, S12, and S22, is it enough to just use S11 to represent the performance of return loss and impedance of antenna together? If S11 can perform impedance of antenna, then I just need to import the S11 and gain of the antenna.
Again do you have basic knowledge of RF circuit theory surely ?
S11 is completely equivalent to impedance.
Do you understand a definition of antenna gain surely ?RX antenna gain is treated as EMF voltage or available power.
The followings are general notes.
- Use correct terminologies.
- Warnigns are different from Errors.
-
ADS is not name of simulator. -
There is no tool which name is Cadence. - All gains in Direct Plot of Cadence ADE are "right", "true" and "practical" voltage gain.
- MATLAB are different from Simulink.
- Learn measurements using actual instruments. Not "EDA Tool Play".