Integrated antenna for RFIC package applications
A chip package includes a plurality of layers including conductive planes connected by vias. The layers include a first portion having an antenna formed therein and a parallel-plate mode suppression mechanism to suppress parallel-plate mode excitation of the antenna. The parallel-plate mode suppression mechanism includes a reflector offset from an antenna ground plane and first grounded vias. A second portion has an interface for connecting to an integrated circuit device wherein the first portion and the second portion are separated by the parallel-plate mode suppression mechanism.
1. A chip package, comprising:
a plurality of layers including conductive planes connected by vias, the layers including:
a first portion having at least one antenna, antenna ground plane, and first grounded vias formed therein; and
a second portion having a conductive plane parallel to the ground plane that forms an interface for connecting to at least one integrated circuit device; and
a third portion between the first and the second portion comprising:
an antenna feed line;
a vertical transmission line that includes a signal via connecting the antenna feed line to the at least one integrated circuit; and
a parallel-plate mode suppression mechanism around a portion of the antenna feed line to suppress parallel-plate mode excitation from the antenna feed line between the antenna ground plane and the conductive plane, the parallel-plate mode suppression mechanism including a grounded reflector, offset from the antenna ground plane, that forms a cage with the grounded vias around an antenna region and further including second ground vias surrounding the signal via.
2. The chip package as recited in claim 1 , wherein the parallel-plate mode suppression mechanism includes a cage formed to surround at least a portion of an antenna region.
3. The chip package as recited in claim 1 , wherein the at least one integrated circuit includes a radio frequency integrated circuit chip.
4. The chip package as recited in claim 1 , wherein the at least one integrated circuit includes a printed circuit board.
5. The chip package as recited in claim 1 , wherein the first grounded vias include a spacing dependent on an operating wavelength of the antenna.
6. The chip package as recited in claim 1 , wherein the first grounded vias include a spacing of less than 0.25 times an operating wavelength of the antenna.
7. The chip package as recited in claim 1 , wherein the antenna includes one of a regular, a stacked or a cavity-backed aperture-coupled patch antenna.
8. The chip package as recited in claim 1 , wherein the antenna includes one of a slot or a slot loop antenna.
9. The chip package as recited in claim 1 , wherein the vertical transmission line includes differential transmission lines for a differential antenna.
10. A system, comprising:
a radio frequency integrated circuit (RFIC);
a package structure including a plurality of layers having conductive planes connected by vias;
the package structure having a first portion and a second portion on opposing sides, the first portion including at least one antenna and ground plane integrated in the package structure, the second portion including pads to bond with the RFIC and at least one conductive plane parallel to the ground plane;
an antenna feed line formed between the first portion and the second portion;
a vertical transmission line that includes a signal via connecting the antenna feed line to the RFIC; and
a parallel-plate mode suppression mechanism disposed around a portion of the antenna feed line, between the first portion and the second portion, to suppress parallel-plate mode excitation from the antenna feed line between the ground plane of the first portion and the conductive plane of the second portion, the parallel-plate mode suppression mechanism including a grounded reflector and first grounded vias to at least partially form a cage round an antenna region, the reflector being vertically and horizontally offset from an antenna ground plane and further including second ground vias surrounding the signal via.
11. The system as recited in claim 10 , wherein the second portion includes additional pads to connect to a printed circuit board.
12. The system as recited in claim 10 , wherein the first grounded vias include a spacing dependent on an operating wavelength of the antenna.
13. The system as recited in claim 10 , wherein the first grounded vias include a spacing of less than 0.25 times an operating wavelength of the antenna.
14. The system as recited in claim 10 , wherein the antenna includes one of a regular, a stacked or a cavity-backed aperture-coupled patch antenna.
15. The system as recited in claim 10 , wherein the antenna includes one of a slot or a slot loop antenna.
16. The system as recited in claim 10 , wherein the vertical transmission line includes differential transmission lines for a differential antenna.