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BQ51021: Selecting a proper Rx coil BQ51021

Part Number: BQ51021
Other Parts Discussed in Thread: BQ51013B

Hey!

Since there are no recommended Rx coils given in the above Ic's data sheet I have employed(such as the ones given in the bq51013b data sheet)

Rx- TDK 22*12*0.87 mm coil

Tx -A5 coil for my design.

When I do the simulations I get very poor effieicny. Is that something related to the selection of the coils?

Please clarify

Thank you!