Antenna and interference
Antenna and interference
(OP)
Hi everyone,
I have a problem and i hope someone can help me,
I am designing a system comprising the following (RFID system(13.56Mhz) - TFT LCD (alike to the one in smartwatch))
The antenna used in the RFID system is inductive loop antenna,
if i put the antenna as in the assembly shown in the image attached,
Will this affect the performance of the antenna, or the LCD in a negative manner,
Thanks in advance,
Ahmed Tarek
I have a problem and i hope someone can help me,
I am designing a system comprising the following (RFID system(13.56Mhz) - TFT LCD (alike to the one in smartwatch))
The antenna used in the RFID system is inductive loop antenna,
if i put the antenna as in the assembly shown in the image attached,
Will this affect the performance of the antenna, or the LCD in a negative manner,
Thanks in advance,
Ahmed Tarek





RE: Antenna and interference
RE: Antenna and interference
One could retune the antenna, if it's even resonant to begin with. Adjust the parallel capacitor if applicable.
EMI on circuits could be modelled, or just take some commonsense E3 precautions and build a rough prototype. Try it.
One could also use the embedded software to blank the display when transmitting, and vice versa.
RE: Antenna and interference
Dan - Owner
http://www.Hi-TecDesigns.com
RE: Antenna and interference
TTFN (ta ta for now)
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RE: Antenna and interference
I understood that the excitation to power-up the passive RFID tags was a significant challenge. The limiting factor for range.
If there's enough to power-up the RFID tag, then there's certainly enough RF to generate noticeable voltages on unprotected circuitry in the middle of the coil.
Just asking, curious.
RE: Antenna and interference
Dan - Owner
http://www.Hi-TecDesigns.com
RE: Antenna and interference
Another ref: The specs for the TI TRF7960A state "Programmable Output Power: +20 dBm (100 mW) or +23 dBm (200 mW)".
That's close enough that your "around 10dBm" statement is perfectly correct. Thank you for adjusting my assumptions.
Yes, that is a fairly low power. So addressing the EMI risks or issues should be quite easy.