Hello,
I am trying to understand why resonance improves wireless power transmission, and I've found this in wikipedia:
"Because the Q factor can be very high, (experimentally around a thousand has been demonstrated[38] with air cored coils) only a small percentage of the field has to be coupled from one coil to the other to achieve high efficiency, even though the field dies quickly with distance from a coil, the primary and secondary can be several diameters apart."
Why only a small percentage of the field has to be coupled for high efficiency?
there is also this sentence: "provided the secondary coil cuts enough of the field that it absorbs more energy than is lost in each cycle of the primary, then most of the energy can still be transferred."
What does the part in Bold means?
Thank you!
I am trying to understand why resonance improves wireless power transmission, and I've found this in wikipedia:
"Because the Q factor can be very high, (experimentally around a thousand has been demonstrated[38] with air cored coils) only a small percentage of the field has to be coupled from one coil to the other to achieve high efficiency, even though the field dies quickly with distance from a coil, the primary and secondary can be several diameters apart."
Why only a small percentage of the field has to be coupled for high efficiency?
there is also this sentence: "provided the secondary coil cuts enough of the field that it absorbs more energy than is lost in each cycle of the primary, then most of the energy can still be transferred."
What does the part in Bold means?
Thank you!