Your are correct that the size ratio between the RX and TX is important. The coupling decreases as the RX:TX ration gets smaller.
The coil used on the TIDA-00762 is 760308101103 from Wurth Electronik. It is 6.5uH and 30mm in diameter.
The inductance of the RX does not need to match that of the TX. Efficiency is best if they are the same physical size, but most applications do not have that. The RX coil is usually smaller in size than the TX coil.
Another consideration is…
Other Parts Discussed in Thread: BQ51050B , CC2650 , BQ51003 , TIDA-00668 , BQ500212AEVM-550 , TIDA-00762 , BQ25100 , BQ24090 Hi there,
how can i get the L's, Ls, fs and fd from a Coil?
I want to use the BQ51050B with the WE 760308103206 Coil.
The Coil specs…