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helical coil operating at 13.56MHz boundary conditions in hfss
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hi,
I have designed a single turn coil radius=10cm and thickness 5mm, I need to find the resonance frequency of the coil using hfss
the theoretical calculated inductance is .464 uH and for the coil to resonate at 13.56 MHz approximately i need to add a lumped capacitance of value 330pF.
I tried to assign radiation boundaries at more than lambda/4 distance dat is 530cm from the coil and applied a lumped cap value of 330pF but it shows the s-parameter curve at nearly 500MHz range
and surprisingly whn i changed the value of capacitance there is no effect on the result.
could anyone tell y thelumpedcap is not effecting the resonance of the structure and also assigning the right boundary conditions.
could anyone help me to solve this problem...
the radiation boundary is not shown in the figure given below..
if anyone needs the hfss file i could upload that too for your convince to go through my problem
I have designed a single turn coil radius=10cm and thickness 5mm, I need to find the resonance frequency of the coil using hfss
the theoretical calculated inductance is .464 uH and for the coil to resonate at 13.56 MHz approximately i need to add a lumped capacitance of value 330pF.
I tried to assign radiation boundaries at more than lambda/4 distance dat is 530cm from the coil and applied a lumped cap value of 330pF but it shows the s-parameter curve at nearly 500MHz range
and surprisingly whn i changed the value of capacitance there is no effect on the result.
could anyone tell y thelumpedcap is not effecting the resonance of the structure and also assigning the right boundary conditions.
could anyone help me to solve this problem...
the radiation boundary is not shown in the figure given below..
if anyone needs the hfss file i could upload that too for your convince to go through my problem
To get resonance near 500 MHz using a 330pF capacitor, the inductor should be about 0.4nH (400pH).
So, I assume your inductance calculation is wrong.
I mentioned that i designed for 13.56MHz but i am getting the simulation result around 500Mhz and the simulation shows no variation if i change the capacitance also.
Your calculation is right.
I used to design a coil like you and have the almost same results. In my case,radiation boundary is 2.5 meter from coil.
Your lumped capacitor is strange and different from mine.
Can you upload your HFSS file and I will check?
Thuan
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