They are applied as antennas to transmit or receive a signal or energy. They are often made on a frameless basis by mechanical connection or thermal sintering of the windings.
How are they used?
Radio frequency identification devices including key chains, travel passes and other documents, radio frequency tags and readers. Also for wireless chargers, where there is a transmitter (the device itself) and an antenna — a built-in inductor in a mobile gadget or even a car. We receive more and more such orders, because they are the future.