NFC antenna with interleaved coils

摘要

An antenna circuit for near-field communications includes a planar active winding, connected between a first and a second access terminal; an auxiliary winding coplanar with the active winding and connected by a first end to the first access terminal; and a tuning capacitor connected to the second end of the auxiliary winding. The turns of the active and auxiliary windings are interleaved.

主权项

1. An antenna circuit for near-field communications comprising:
a planar active winding including at least one turn of a continuous conductor connected between a first and a second access terminal; a first auxiliary winding coplanar with the active winding and including multiple turns of a continuous conductor connected by a first end to the first access terminal, a second end of the auxiliary winding being coupled to the second access terminal through a tuning capacitor, wherein the planar active winding and the first auxiliary winding have interleaved turns, a portion of the continuous conductor of the first auxiliary winding crossing a portion of the continuous conductor of the planar active winding, and wherein each turn represents a loop.