Linked antenna pair for transmission through shielded shipping container
The present disclosure provides a linked antenna pair for a shipping container having a thermally insulated and electromagnetically shielded cavity for holding a payload. The linked antenna pair comprises a first antenna disposed inside the cavity, a second antenna disposed outside the cavity, and a feed line that electrically connects the first antenna to the second antenna.
1. A shipping container comprising:
a thermally insulated and electromagnetically shielded cavity for holding a payload;
an insulating body comprising a plurality of vacuum insulation panels assembled together;
an insulating cover comprising a vacuum insulation panel that is removably assembled onto the insulating body to define the cavity, wherein each of the vacuum insulation panels in the insulating body and the insulating cover includes an evacuated porous core and a low permeability gas-barrier metallized film; and
a linked antenna pair comprising:
a first antenna disposed inside the cavity;
a second antenna disposed outside the cavity; and
a feed line electrically connecting the first antenna to the second antenna.
2. The shipping container of claim 1 , wherein the feed line passes through a seam between two adjacent vacuum insulation panels.
3. The shipping container of claim 1 , wherein the first antenna is affixed to an inner face of a first vacuum insulation panel.
4. The shipping container of claim 3 , wherein the second antenna is affixed to an outer face of the first vacuum insulation panel.
5. The shipping container of claim 3 , wherein the second antenna is affixed to an outer face of a second vacuum insulation panel adjacent to the first vacuum insulation panel.
6. The shipping container of claim 1 , further comprising a radiation absorbing material disposed at or near the members defining the cavity.
7. The shipping container of claim 1 , further comprising a wireless communication device located within the electromagnetically shielded cavity.
8. The shipping container of claim 7 further comprising a sensor inside the cavity associated with the wireless communication device.
9. The shipping container of claim 7 , wherein the first antenna and the wireless communication device are disposed in predetermined locations within the cavity.
10. The shipping container of claim 9 , wherein a pair of opposing sides of the cavity is separated by a first distance and the first antenna and the wireless communication device are separated by a second distance, is the second distance being less than half of the first distance.
11. A shipping container comprising:
a thermally insulated and electromagnetically shielded cavity for holding a payload; and
a flexible printed wiring member, comprising
a linked antenna pair, the linked antenna pair comprising:
a first antenna disposed inside the cavity;
a second antenna disposed outside the cavity; and
a feed line electrically connecting the first antenna to the second antenna;
a first metal layer, the first metal layer forming the feed line, a portion of the first antenna, and a portion of the second antenna;
a second metal layer;
a first dielectric layer disposed between the first metal layer and the second metal layer;
a third metal layer; and
a second dielectric layer disposed between the first metal layer and the third metal layer.
12. A shipping container comprising:
a thermally insulated and electromagnetically shielded cavity for holding a payload; and
a flexible printed wiring member, comprising
a linked antenna pair, the linked antenna pair comprising:
a first antenna disposed inside the cavity, the first antenna being associated with a first ground plane;
a second antenna disposed outside the cavity, the second antenna being associated with a second ground plane; and
a feed line electrically connecting the first antenna to the second antenna, the feed line being associated with a third ground plane.
13. The shipping container of claim 12 , wherein the first ground plane, the second ground plane and the third ground plane are formed in a single metal layer.
14. A shipping container comprising:
a thermally insulated and electromagnetically shielded cavity for holding a payload; and
a flexible printed wiring member, comprising:
a linked antenna pair, the linked antenna pair comprising:
a first antenna disposed inside the cavity;
a second antenna disposed outside the cavity;
a feed line electrically connecting the first antenna to the second antenna;
a first dielectric having a first height disposed between a first signal layer and a first ground plane associated with the first antenna;
a second dielectric having a second height disposed between a second signal layer and a second ground plane associated with the second antenna; and
a third dielectric having a third height disposed between a third signal layer and a third ground plane associated with the feed line, wherein the third height is less than both the first height and the second height.
15. A shipping container comprising:
a thermally insulated and electromagnetically shielded cavity for holding a payload;
an insulating body comprising a plurality of vacuum insulation panels assembled together;
an insulating cover comprising a vacuum insulation panel that is removably assembled onto the insulating body to define the cavity, wherein each of the vacuum insulation panels in the insulating body and the insulating cover includes an evacuated porous core and a low permeability gas-barrier metallized film; and
a flexible printed wiring member, comprising:
a linked antenna pair, the linked antenna pair comprising:
a first antenna disposed inside the cavity;
a second antenna disposed outside the cavity; and
a feed line electrically connecting the first antenna to the second antenna;
a first metal layer, the first metal layer forming the feed line, a portion of the first antenna, and a portion of the second antenna;
a second metal layer, the second metal layer being discontinuous; and
a first dielectric layer disposed between the first metal layer and the second metal layer.