Hawaslsh
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1) When i define a lumped port between my terminals, i am forced to choose a port impedance (which makes sense) but i feel it is perturbing my results by add a 50ohm connection which doesn't really exist. Is a lumped port really the best way to proceed here?
2) From this type of simulation, what results would actually show the series Rs and Ls of the coil. Is it simply Z11? Since I am using a lumped port, Zo seems out of the question since its always 50 ohms.
I would be very surprised if the intended capacitively coupling works at 1 MHz.
I get non sense results from HFSS. The input impedance is basically an open no matter what do I.
I guess, the idea behind the "capacitive coupling" is to avoid a trace crossing. But as Brad has calculated, the required capacitance values for 1 MHz can't be implemented. HFSS simulation won't help you, just confirm that the design idea is doomed to failure.
Could be another interpretation, despite of the missing loop closure in the picture. But I fear, I would work neither for 1 MHz.Ok, I understood that the capacitive coupling is between the pads and the RFID chip.
The loops are not meant to connect. The point is to have an anteann that can be etched directly onto pcb.
Sounds like a industry standard 13.56MHz chip (ISO 14443/NFC) which would well fit the 1.6 µH coil. Apparently also the operation frequency has been obfuscated…The chip itself is a “contactless chip” which simply means it possesses a loading capacitance of 68pF.
your design idea with open ends will fail.
You cannot transfer layout concepts from UHF tags to low frequencies.
bunch of 3D printer folks, who have no clue about RF anything, and I don’t really have the heart to tell the higher ups ...
It’s not my design idea, straight from the company (NXP) engineers.
but, maybe there is a connection between the two loop ends (the half moon and "triangle" shapes)?
Do you think i can modify the loop design so the only bridge connection is the chip itself?
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