Freight container side-mounted antenna
An antenna is provided for satellite communication configured to be mounted in horizontal corrugated recesses of freight container doors. The antenna case has a front side whose vertical dimension is less than or equal to a front recess gap size of 14.5 cm, tapering to a back side vertical dimension of less than or equal to a back recess length of 7 cm, and a case depth of less than or equal to a recess depth of 3.3 cm. The antenna includes a patch layer and a transmission line layer, wherein the patch layer comprises a 2×2 patch layout, giving antenna gain greater than 0 dBi for 0 to 60 degrees above the horizon.
1 . An antenna device for satellite communications configured to be mounted on freight container doors, the antenna device comprising:
a case, mountable horizontally to a container side; and
one or more printed circuit board (PCB) layers set in the case, comprising a patch layer and a transmission line layer, wherein the patch layer comprises a 2×2 patch layout, and wherein striplines of the transmission line layer are configured to set an upward beam steering direction, with circular polarization of transmission, giving an antenna gain greater than 0 dBi for 0 to 60 degrees above the horizon, in an uplink range of at least 1525-1559 MHz, and in a downlink range of at least 1626-1661 MHz.
2 . The antenna device of claim 1 , wherein the upward beam steering direction is at least 30 degrees above the horizon.
3 . The antenna device of claim 2 , wherein the patch layer is on a FR-4 dielectric substrate having a thickness of 0.6 cm+/−10%.
4 . The antenna device of claim 1 , wherein the antenna device has a thickness of less than or equal to a corrugated door recess depth of 33 mm.
5 . The antenna device of claim 1 , wherein the case has a front side whose vertical dimension is less than or equal to a front recess gap size of 145 mm.
6 . The antenna device of claim 1 , wherein the case has a front side tapering to a back side vertical dimension of less than or equal to a back recess length of 70 mm.
7 . The antenna device of claim 1 , wherein the case depth is less than or equal to a recess depth of 33 mm.
8 . The antenna device of claim 1 , wherein vertical spacing between patch centers is less than 6 cm.
9 . The antenna device of claim 1 , wherein case tapering from front to back comprises a first taper conforming to a narrow recess taper of a first type of corrugated door recess, and a second taper conforming to a wider recess taper of a second type of corrugated door recess.
10 . The antenna device of claim 1 , wherein the case perimeter has at least two mounting holes at each horizontal end.
11 . The antenna device of claim 1 , wherein the PCB layers further comprise a component layer, wherein the component layer comprises a modem configured to generate data transmissions, which are transmitted from the patch layer, and to receive data transmissions received from the patch layer.
12 . The antenna device of claim 1 , each patch having square dimensions of 42 mm (+/−10%).