Low cost high frequency device package and methods
View Patent ↗A low-cost high-frequency electronic device package and associated fabrication method are described wherein waveguide structures are formed from the high frequency device to the package lead transition. The package lead transition is optimized to take advantage of waveguide interconnect structure.
1. An electrical component package, comprising:
a package having a plurality of leads and a base;
a structure attached to said base, the structure having at least one site; and
at least one waveguide interconnect connecting the at least one site on said structure to at least one of said plurality of leads of the package, the waveguide interconnect comprising a shield, wherein the shield has a connection to a package lead ground,
wherein two leads adjacent the at least one of said plurality of leads connected to the waveguide interconnect each comprises a ground lead,
wherein the two ground leads and the at least one of said plurality of leads attached to the waveguide interconnect are shaped to form a transition from a planar transmission line to a coaxial transmission line, with an impedance of the waveguide interconnect being matched to an impedance of the at least one of said plurality of leads.
2. The package of claim 1 , wherein an outer grounded conductive layer has a connection to a ground of the structure.
3. The package of claim 1 , wherein an outer grounded conductive layer has a connection to the package lead ground and a ground of the structure.
4. The package of claim 2 , wherein said connection to said ground of the structure further comprises at least one via formed in an insulator layer of the ground of the structure.
5. The package of claim 1 , wherein said connection to said package lead ground further comprises at least one via formed in an insulator layer of the package lead ground.
6. The package of claim 3 , wherein a ground connection to said package lead ground and said ground of the structure further comprises at least one via formed in an insulator layer of the package lead ground and the ground of the structure.
7. The package of claim 1 , wherein the two ground leads are adjacent the waveguide interconnect and are spaced apart to maintain an approximately constant impedance.
8. The package of claim 1 , wherein the package is a quad flat no lead package.
9. The package of claim 1 , wherein the structure further comprises a device.
10. The package of claim 1 , wherein the waveguide interconnect further comprises a transmission line.
11. The package of claim 10 , wherein the transmission line further comprises one of a parallel plate, a planar parallel conductor and a coaxial.
12. The package of claim 1 , wherein each site further comprises a bonding pad.
13. The package of claim 1 , wherein the structure has a second site; and wherein the at least one waveguide interconnect is internal to the package and connects the at least two sites on the structure to each other.
14. The package of claim 13 , wherein each site further comprises a bonding pad.