US Patent 11418235 Variable ratio near field wireless device

One example discloses a near-field wireless device, including: a controller configured to be coupled to a near-field antenna; wherein the near-field antenna includes, a near-field electric antenna configured to transmit and/or receive near-field electric (E) signals; and a near-field magnetic antenna configured to transmit and/or receive near-field magnetic (H) signals; a conductivity monitor configured to determine a conductivity of a medium proximate to the near-field device; wherein the controller is configured to modulate an E/H ratio of fields generated by and/or received from the near-field electric (E) antenna and the near-field magnetic (H) antenna based on the conductivity of the medium.