Antennas using chip-package interconnections for millimeter-wave wireless communication
A compact millimeter-wave transmitter and receiver make use of interconnections within a chip-containing package for providing an integrated antenna. Due to shorter wavelength of millimeter-waves, these interconnections can be used as antennas for radiation of electromagnetic waves. A dielectric cover or lens is provided within the package to increase the antenna's directivity and to provide a mechanical shield for the chip.
1. An apparatus that radiates at millimeter-wave frequencies comprising:
a. a package comprising an electrically conductive paddle and at least one electrically conductive pin physically separate from said electrically conductive paddle,
b. a chip having a conductive chip pad, said chip being attached to said conductive paddle and having at least a first conductive member thereon,
c. at least one interconnection comprising an electrically conductive length of material having first and second ends,
d. said first end of said interconnection being connected to said first conductive member on said conductive chip pad and said second end being connected to a second member selected from the group consisting of said conductive paddle and said one electrically conductive pin,
whereby said interconnection can radiate electromagnetic energy so as to form an antenna element that can radiate at millimeter-wave frequencies for millimeter-wave systems.
2. The apparatus of claim 1 , further comprising a means for providing an effective ground, said second end being connected to said effective ground.
3. The apparatus of claim 2 wherein the effective electrical length of said interconnection is approximately a natural number multiple of quarter wavelengths at a predetermined millimeter-wave frequency.
4. The apparatus of claim 2 wherein said interconnection comprises two interconnections forming two antenna elements and said two antenna elements are excited in opposite phase to form a dipole-like antenna.
5. The apparatus of claim 2 wherein said interconnection comprises a plurality of interconnections forming a plurality of said antenna elements, thereby forming an antenna array with a specific radiation pattern.
6. The apparatus of claim 5 wherein said antenna array comprises at least four antenna elements that are arranged at the corners of a trapezoid.
7. The apparatus of claim 6 wherein said four antenna elements comprise eight antenna sub-elements that are configured to form four dipole-like antennas.
8. The apparatus of claim 1 , further including a dielectric material that covers said apparatus such that said dielectric material changes the radiation characteristics of said interconnection.
9. The apparatus of claim 1 wherein said interconnection is coupled to circuitry on said chip by using a coupling selected from the group consisting of single-ended and balanced.
10. The apparatus of claim 1 wherein said conductive paddle and said electrically conductive pins comprise metallic material; said package further including a plastic material for physically supporting said conductive paddle and said electrically conductive pins, and said second member is effectively at ground potential; and further including a plastic cover enclosing said one interconnection and said chip and effectively forming a cavity, thereby shaping the radiation characteristics of said interconnection; whereby said interconnection forms said antenna element of an antenna array with a specific antenna pattern and said apparatus radiates electromagnetic energy for use in millimeter-wave systems.
11. The apparatus in claim 10 wherein said cavity is filled with dielectric material, thereby providing rigidity to said interconnections to increase reliability.
12. A method of radiating electromagnetic energy at a millimeter-wave frequency comprising,
a. providing an electrically conductive paddle and a chip attached to said paddle,
b. providing a conductive chip pad on said chip for providing electrical connections to said chip,
c. providing at least one electrically conductive pin in juxtaposition to said conductive paddle to provide a surface for connection,
d. connecting said conductive chip pad to a chosen member selected from the group consisting of said one electrically conductive pin and said electrically conductive paddle using at least one interconnection made from an electrical conductive length of material,
e. designing said one interconnection to radiate by means of its said electrical conductive length, thereby forming an antenna element,
whereby radiation of said antenna element can be used for radiating electromagnetic waves useful for millimeter-wave wireless systems.
13. The method of claim 12 , further comprising a means for achieving effective ground and connecting said second end of interconnection to said effective ground.
14. The method recited in claim 12 wherein effective electrical length of said interconnection is approximately an odd natural number multiple of quarter-wavelengths.
15. The method of claim 12 wherein said interconnection comprises two subinterconnections forming two antenna elements and said two antenna elements are excited in opposite phase to form a dipole-like antenna.
16. The method of claim 12 wherein said at least one interconnection comprises a plurality of interconnections forming a plurality of said antenna elements, thereby forming an antenna array with specific radiation pattern.
17. The method of claim 12 wherein said antenna array comprises at least four antenna elements located on four corners of a trapezoid.
18. The method of claim 12 , further including a dielectric material that covers said antenna elements and chip such that said dielectric material changes radiation characteristics.
19. The method of claim 12 wherein said one interconnection is coupled to the circuitry on said chip by using a method selected from the group consisting of single ended method and balanced method.
20. The method of claim 12 wherein said conductive paddle and said electrically conductive pins comprise metallic material; said package further including dielectric material for physically supporting said conductive paddle and said electrically conductive pins; and said chosen member is effectively at ground potential; and further including a dielectric cover enclosing said one interconnection and said chip and effectively forming a cavity, thereby shaping the radiation characteristics; of said interconnection; whereby said interconnection forms said antenna element of an antenna array with a specific antenna pattern; and said apparatus radiates electromagnetic energy for use in millimeter wave systems.
21. The method of claim 12 wherein said cavity is filled with dielectric material, thereby providing rigidity to said interconnections to increase reliability.
22. An apparatus that radiates at millimeter-wave frequencies comprising:
a. a carrier that has a first surface and at least one second surface, said second surface being conductive,
b. a chip containing circuitry, said chip being attached to said first surface of said carrier,
c. at least one interconnection comprising a length of electrically conductive material,
d. said one interconnection having first and second ends,
e. said first end of said interconnection being connected to said chip and said second end being connected to said second surface
whereby said one interconnection provides a means for radiating, thereby forming an antenna for radiating electromagnetic energy for millimeter-wave systems.
23. The apparatus of claim 22 , further comprising a means for providing an effective ground and means connecting said second end of said interconnection to said effective ground.
24. The apparatus of claim 22 , further including at least one additional interconnection having first and second ends with said first end connected to said chip and said second end connected to said second surface so that said one interconnection and said additional interconnection form an antenna array.