kent5566007
Newbie level 5
Hello all,
I just want to compare the antenna characteristic between simulation, processed by HFSS 13, and real sample purchased from market. I learned the simulation step by step from forum, YouTube and HFSS helper.
But it comes up with huge different result. I try very hard to get a matched simulation, but keep fail and fail.
Is anyone could point out the wrong procedure I processed? Here is the simulation details as following,
Note: all the dimension was measured by microscope with +-0.1mm variation.
According to this result, this RFID can’t even be read from 1 meter away. I run the test by Voyantic test bench to compare the real situation, it shows the conjugate frequency around 940MHz with read range over 5 meter away. And according to my experience, there is no way to come up with such difference with slightly dimension variation.
Please help to give me a hint, I stuck with this problem for two months, and just can’t figure it out.
Thanks,
I just want to compare the antenna characteristic between simulation, processed by HFSS 13, and real sample purchased from market. I learned the simulation step by step from forum, YouTube and HFSS helper.
But it comes up with huge different result. I try very hard to get a matched simulation, but keep fail and fail.
Is anyone could point out the wrong procedure I processed? Here is the simulation details as following,
- Draw the outline of antenna on XY plane with +-0.1mm deviation.
- Add substrate and air space.
- Draw an IC input and two inductor patch on each sides of IC.
- Setup the material for copper antenna with 1.4mil thickness and 0.4mm for FR-4 epoxy substrate.
- Apply Solution Type as Driven Terminal. Setup Perfect E for inductors patches and lumped port input with 28.31+204.1j impedance, which is Alien H3 chip with 28.31-204.1 impedance.
- Setup boundary radiation for air space.
- Setup the max number of passes and Delta. S.
- Setup the sweep.
- Validate and run the analyze.
- Finally, I open the Terminal S parameter result, it turns totally wrong.
Note: all the dimension was measured by microscope with +-0.1mm variation.
According to this result, this RFID can’t even be read from 1 meter away. I run the test by Voyantic test bench to compare the real situation, it shows the conjugate frequency around 940MHz with read range over 5 meter away. And according to my experience, there is no way to come up with such difference with slightly dimension variation.
Please help to give me a hint, I stuck with this problem for two months, and just can’t figure it out.
Thanks,