I have designed a patch antenna in HFSS and now i want to study the circuit parameters of the antenna. please suggest the ways i can extract the circuit parameters of patch antenna.
Hi,
Every antenna has equivalent circuit diagram. Best way is to study about circuit parameters, go through C. A. Balanis. there is plenty of explanations with examples. Circuit parameters are resistance, capacitance and inductance, which is important to measure when matching is being done. So, the patch and microstrip line have separate parameters which is need to matched.
thanks,
Dear Garg
The procedure can be summarized as follows:-
You just calculate the S11 parameter for the frequency band of interest then
Assume the lumped or distributed circuit model topology then
,Use the optimization techniques to find the circuit parameters that best fit the measured to calculated over the frequency band of interest.
Good Luck.
Prof. S. EL-Rabaie
Dear Garg
I recommend you to use the article, which offers a simple equivalent circuit of the dipole antenna:
M. Hamid and R. Hamid, “Equivalent Circuit of Dipole Antenna of Arbitrary Length,” IEEE Trans. Antennas Propag., vol. 45, no. 11, Nov. 1997, pp.1695-1696.
that, I think, is also suitable for a patch antenna.
The procedure for determining the parameters of this scheme is as follows
1. Derive an analytical expression for the impedance Zcir of this circuit.
2. Calculate the detailed dependence of the impedance of the antenna under study in a given frequency band using HFSS.
3. Create an objective function that describes the difference between Zcir and Zant in the frequency band using the least squares method. The parameters of an equivalent circuit should serve as variables in this function.
4. Find the minimum of this function using known optimization methods. The values of the variables at the function minimum point are the required parameters of the equivalent circuit.
5. Compare the impedance of the circuit with the impedance of the antenna in the frequency band of interest.
If, you are not satisfied with the accuracy of the calculations obtained with this equivalent circuit, use circuits that are more complex. Examples of such circuits can be found here:
http://iopscience.iop.org/article/10.1088/1755-1315/16/1/012073/pdf
http://www.jpier.org/PIERB/pierb08/05.08050403.pdf
http://www.jpier.org/PIERC/pierc45/02.13091101.pdf
http://www.ejaet.com/pdf/1-2/ejaet-1-2-75-79.pdf
Best regards,
Prof. Peter L. Tokarsky
Dear prof. S. ELRabaie
please can you elaborate more on how to go about this your procedure?
As far i know, you need to knwo the equivalent in terms of R L C and you can find values by tuning in ADS to get same S Parameter response as you got though HFSS.
Hello mr Nitin the procedure is what is given me problem may be if you can help me with the steps thank you.
Hello @Adamo . to design an equivalent circuit is simple in NI AWR.
This papers may also help you:
Typical Approach of Modeling Lumped Equivalents for Narrowband Antennas
Lumped equivalent models of narrowband antennas and isolation enhancement in a three antennas system.
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