hi everybody,
I have designed a loop antenna in hfss, and I want to see its Magnetic field along its axis.
I have simulate it in Ansoft maxwell and I obtain its inductance 1.8uH.
I have two problems in simulating:
1. what kind of excitation is preferable? I have tried the tutorial of hfss but it didnt give me the right inductance.
2. I can plot E field along axis but not about H field.
what should i do :bang:
HFSS only plots results on previously selected surfaces and only for selected parts of the simulation. If you want to plot the H-field say on the XY-plane, make sure you've selected the XY plane from the Planes tab in the model window. Then right click on your selection, choose "Plot Fields" > "Mag_H". Make sure to select "AllObjects" from the "In Volume" subscreen if you want to plot results for the complete calculated area.
In this case, your line needs to be drawn before you simulate the structure. Draw the line, run the simulation, then create a new rectangular plot. Under "Geometry" in the top left corner, select your line. Then you can plot various field quantities.
In this case, your line needs to be drawn before you simulate the structure. Draw the line, run the simulation, then create a new rectangular plot. Under "Geometry" in the top left corner, select your line. Then you can plot various field quantities.
I have simulate a loop antenna in HFSS, in order to see L, R_ant, C_ant and its H field. I can see its L but I dont have any idea about calculating C_ant.
I have one more problem about its resonance frequency, I want it to resonate at 13.56, but its resonance freq is about 110 MHz.
thanks alot. But in nxp documents a Ca is considered for antenna equivalent circuit at its resonance frequency. How can I calculate L, C and R of antenna in its resonance frequency?
Oops! I made mistake!! Its very easy to calculate C!!!
but I have another problem!
at the low frequency end, the inductance begins to increase. According to the theory, when frequency is approaching to zero, the inductance should approach its DC value. Not sure why here it starts to increase.
Hi nasibeh, I also get the same result no matter in simulation or measurement, which at low frequency (such as 1 MHz) inductance will decrease from higher value to DC value with frequency increasing. In my design the inductance is 180 nH, but the inductance at 1 MHz is around 190 nH and at 10 MHz the inductance is around 180 nH.