Hi, I'm looking for a patch to simulate an antenna, ie, find its equivalent electrical circuit (RLC), so can anyone explain the process to me? Thank you
Dear Abid,
A resonant antenna equivalent circuit is composed of a parallel resonance circuit
which is composed of a parallel combination of an inductance L, a capacitance C and a resistance R which is the radiation resistance.
You need to measure the input impedance of the antenna as a function of the frequency. Then you can represent the Zi magnitude and phase phi.
Then you can get the resonance frequency and the bandwidth. w.
The bandwidth w is related to the quality factor where Q= f0/Q; fo is the resonance frequency. f0= 1/2pi sqr (LC) from these two equations one can determine only two unknowns. The capacitor of the patch can be estimated.
There is software programs which can be utilized to get the equivalent circuit.
As an example the ADS.
Best wishes
Dear Abid,
A resonant antenna equivalent circuit is composed of a parallel resonance circuit
which is composed of a parallel combination of an inductance L, a capacitance C and a resistance R which is the radiation resistance.
You need to measure the input impedance of the antenna as a function of the frequency. Then you can represent the Zi magnitude and phase phi.
Then you can get the resonance frequency and the bandwidth. w.
The bandwidth w is related to the quality factor where Q= f0/Q; fo is the resonance frequency. f0= 1/2pi sqr (LC) from these two equations one can determine only two unknowns. The capacitor of the patch can be estimated.
There is software programs which can be utilized to get the equivalent circuit.
As an example the ADS.
Best wishes
Dear Abid Reda el Wardi
I think you know the geometry of the patch antenna you wanna know its RLC equivalent circuit. There exist approximate analytical expressions as well as curves, but accurate values can be be only obtained by numerical simulation (e.g., by FEM). There exist many programs to do so, such as HFSS, CTS and even Matlab codes. I recommend the antenna toolkit of HFSS.
Dear Abid Reda el Wardi ,
I think this article can help you solve your problem
http://www.jpier.org/PIERB/pierb08/05.08050403.pdf
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