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RFID resonance frequency

Posted May 10, 2021, 8:35 a.m. EDT Low-Frequency Electromagnetics, RF & Microwave Engineering Version 5.6 4 Replies

Kelvin Okenye
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Hallo, I am new to COMSOL simulations in the RF section. I am designing a spiral RFID antenna which should have a resonance frequency of 13.56MHz. I have a coil with an inductance of 2.96uH (which i verified using the ac/dc physics and calculation) and I place a parallel capacitor using a lumped element boundary condition. The spiral has 8 turns and is made of stainless steel having an impedance boundary condition and the boundary feed is a lumped boundary with a feed of 3.3V. However, my model returns a resonance at about 800MHz. Does anyone have an insight of what I am doing wrong?

4 Replies Last Post May 11, 2021, 6:05 a.m. EDT
Kelvin Okenye
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Posted: 3 years ago May 10, 2021, 8:43 a.m. EDT

This is the .mph file

This is the .mph file
Jeff Hiller COMSOL Employee

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Posted: 3 years ago May 10, 2021, 9:04 a.m. EDT

Hi Kelvin,

The file did not get attached. Maybe that's because of its size. You can reduce an mph file's size by clearing the solutions and meshes.

Best,

Jeff

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Jeff Hiller
Hi Kelvin, The file did not get attached. Maybe that's because of its size. You can reduce an mph file's size by clearing the solutions and meshes. Best, Jeff
Kelvin Okenye
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Posted: 3 years ago May 10, 2021, 10:33 a.m. EDT

Hi Jeff, let me try to attach it again

Hi Jeff, let me try to attach it again
Kelvin Okenye
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Posted: 3 years ago May 11, 2021, 6:05 a.m. EDT

Hi

Hi Kelvin,

The file did not get attached. Maybe that's because of its size. You can reduce an mph file's size by clearing the solutions and meshes.

Best,

Jeff

Hi Jeff this is the mph file

Hi >Hi Kelvin, > >The file did not get attached. Maybe that's because of its size. You can reduce an mph file's size by clearing the solutions and meshes. > >Best, > >Jeff Hi Jeff this is the mph file

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