Hollow coil 3
The quality factor Q is a physical quantity representing the quality of the coil and Q is the ratio of the inductive reactance XL and its equivalent resistance, ie: Q=XL/R.
The higher the Q of the coil, the smaller the loss of the loop. The Q value of the coil and the direct current resistance of the wire, the dielectric loss of the skeleton, the loss caused by the shield or the core, the influence of the high frequency skin effect and other factors. The Q of the coil is usually tens to hundreds.