Apparatus for shielding H-field signals

A container configurable to isolate an interior storage space from signals from a surrounding environment at a signal frequency, the container comprising:

• a first housing component with eddy current shielding characteristics;
• and
• a second housing component matable with the first housing component;
• wherein the first and second housing components are movable between:
• an open state wherein the interior storage space is accessible;
• and
• a closed state wherein the first and second housing components together enclose the interior storage space, and wherein spacing between the first and second components defines a signal path between the interior storage space and the environment that has geometry with waveguide beyond cutoff characteristics for the signal frequency, thereby attenuating signals traveling from the surrounding environment through the signal path toward the interior storage space.

A lockbox configured to securely store a wireless keyfob responsive to signals at a signal frequency, the lockbox comprising:

• a multi-part container having eddy current shielding characteristics, the container being adjustable between:
• a closed state wherein parts of the multi-part container overlap to enclose an interior storage space, and wherein spacing between the parts defines a signal path having waveguide beyond cutoff geometry at the signal frequency, so that the interior storage space is shielded from electromagnetic radiation at the signal frequency while the multi-part container is in the closed state;
• and
• an open state wherein parts of the multi-part container are separated to permit access to the interior storage space;
• and
• a locking mechanism operable to secure the multi-part container in the closed state.