matching of transformer coupled circuit
matching of transformer coupled circuit
(OP)
dear forum,
I´m using a passive circuit with two coils (one at each end) for relaying a signal between an RFID tranceiver and a transponder. The system operates at 13.56 MHz.
So far I only use a series resistor and a series capacitor for resonance frequency in the passive relay circuit. The distance between the two coils is only 2 -3 cm, and I have connected it by twisting a copper wire.
I´m wondering if I have to macth each end of the passive circuit to 50 ohm? (or to each other) to avoid reflections?
Any opinions on this?
I´m using a passive circuit with two coils (one at each end) for relaying a signal between an RFID tranceiver and a transponder. The system operates at 13.56 MHz.
So far I only use a series resistor and a series capacitor for resonance frequency in the passive relay circuit. The distance between the two coils is only 2 -3 cm, and I have connected it by twisting a copper wire.
I´m wondering if I have to macth each end of the passive circuit to 50 ohm? (or to each other) to avoid reflections?
Any opinions on this?





RE: matching of transformer coupled circuit
Matching the transceiver and transponder antennas to each other might give some improvement; think of it as a transformer.
At 13.56 MHz your wavelength is extremely long (about 22 meters) so reflections over 2-3 cm will not be a problem.