Apparatus for shielding H-field signals
View Patent ↗An improved container configured to store a wireless-enabled device therein and also configured to prevent the wireless-enabled device from being activated by an external wireless signal.
1. A lockbox configured to securely store a wireless device responsive to a wireless signal 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 container, when in the closed state, shields the interior storage space from electromagnetic radiation at the signal frequency; 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.
2. The lockbox of claim 1 , wherein the wireless signal is a low frequency H-field signal.
3. The lockbox of claim 1 , wherein parts of the multi-part container are configured to interleave with each other in the closed state.
4. The lockbox of claim 1 , wherein the interior storage space is configured to store a keyfob.
5. The lockbox of claim 1 , wherein the interior storage space is configured to store a Near Field Communications device.
6. The lockbox of claim 1 , wherein the interior storage space is configured to store a radio frequency identification device.
7. 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.
8. The container of claim 7 , wherein the interior storage space is configured to store a wireless device having an activation signal strength threshold, and wherein the predetermined amount by which the wireless signal is attenuated is selected to reduce the signal strength of signals from a surrounding environment below the activation signal strength threshold.
9. The container of claim 7 , wherein the wireless device is a keyfob.
10. The container of claim 7 , wherein the wireless device is a Near Field Communications device.
11. The container of claim 7 , wherein the wireless device is a radio frequency identification device.
12. The container of claim 7 wherein the first housing component has a first aperture formed therein, and the second housing component has a second aperture formed therein.
13. 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.
14. The lockbox of claim 13 , wherein the internal storage space is configured to hold a vehicle keyfob.
15. The lockbox of claim 14 , wherein the internal storage space is configured to hold an automobile keyfob.