Resonant structure to mitigate near field radiation generated by wireless communication devices

摘要

A method (600) and an RF circuit (100, 400, 500) for a wireless communication device that mitigates near electric fields generated by the wireless communication device. At least one resonant structure (108, 408, 408′) can be configured to resonate at or near at least one operating frequency of an antenna (102) of the wireless communication device. The antenna can be a component of the RF circuit. The resonant structure can be electromagnetically coupled to the antenna to mitigate the near electric fields at the operating frequency in order to comply with an applicable hearing aid compatibility (HAC) specification.

主权项

1. A method of mitigating near electric fields generated by a wireless communication device, comprising:
configuring at least a first resonant structure to resonate at or near at least a first operating frequency of an antenna of the wireless communication device, wherein the first resonant structure does not include a feed port; electromagnetically coupling the first resonant structure to the antenna to mitigate the near electric fields at the operating frequency; and coupling a transmitter to the antenna, the transmitter being configured to communicate electromagnetic signals to the antenna; and wherein configuring the first resonant structure to resonate at or near the first operating frequency of the antenna of the wireless communication device comprises: configuring the first resonant structure to comprise at least a first portion having an inductive impedance and at least a second portion having a capacitive impedance; and wherein configuring the first resonant structure to resonate at or near the first operating frequency of the antenna of the wireless communication device comprises: positioning the second portion of the first resonant structure proximate to a ground plane to establish the capacitive impedance between the second portion and the ground plane; and wherein configuring the first resonant structure to resonate at or near the operating frequency of the antenna of the wireless communication device further comprises: electrically coupling a first port of the first portion of the first resonant structure to the second portion of the first resonant structure; and electrically coupling a second port of the first portion of the first resonant structure to a ground potential; and wherein the first portion and the second portion are coplanar.