CASCADED COILS FOR MULTI-SURFACE COVERAGE IN NEAR FIELD COMMUNICATION

摘要

Described herein are techniques related to near field coupling and wireless power transfers. A device may include a cascaded coil antenna to include a first coil antenna that is connected in series with a second coil antenna. The first and second coil antennas are independent antennas prior to cascading and are located in different surfaces of the device to establish near field coupling through front side, top side, bottom side, or corner side of the portable device. Furthermore, a flux guide may be placed in the cascaded coil antenna to facilitate magnetic flux at the first coil antenna and the second coil antenna to induce current of the same phase during receive mode. During transmit mode, the flux guide facilitates the magnetic flux at the first coil antenna and the second coil antenna to generate magnetic fields of the same direction.

主权项

1. A smart phone, comprising:
a near field communications (NFC) module; a coil antenna configured to transmit and receive near field communications (NFC) signals; and first and second conductors that couple the NFC module to the coil antenna,
wherein the coil antenna comprises a first coil antenna and a second coil antenna connected in series with the first coil antenna,wherein the first and second coil antennas are disposed at different locations within the smart phone,wherein the first coil antenna comprises at least two concentric loops and wherein the second coil antenna comprises at least three concentric loops,wherein the first conductor is connected to the first coil antenna, andwherein the second conductor is connected to the second coil antenna.