A winding type or multi-layer type coil is suitable since large current flows through the coil.
Winding
Multilayer
The matching coil should be a high-Q type or tight inductance tolerance type coil for improved reliability, in principle.
A thin film type coil is suitable to a receiver circuit, in particular, which requires tight inductance tolerance.
Film
Winding
Multilayer
Application Examples of Cellular Phone
