Feedthrough lens antenna and associated methods

• US 6,417,813 B1
• Filed: 07/31/2001
• Issued: 07/09/2002
• Est. Priority Date: 10/31/2000
• Status: Expired due to Term

• Current Assignee: North South Holdings Incorporated (Spherix Incorporated)
• Original Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Inventors: Durham, Timothy Earl
• Primary Examiner(s): Wimer, Michael C.
• Application Number:
  US09/919,449
• Publication Number:
  US 20020050951A1
• Time in Patent Office: 343 Days
• Field of Search: H01/Q 2.100, H01/Q 2.126, H01/Q 2.128, H01/Q 2.112, H01/Q 1.502, H01/Q 1.512, 343/753, 343/754, 343/812, 343/814-817, 343/853, 343/795, 343/797
• US Class Current: 343/753
• CPC Class Codes: H01Q 21/0087 Apparatus or processes specially adapted for manufacturing antenna arrays manufacturing waveguides H01P11/00
• CPC Class Codes: H01Q 21/062 using dipole aerials; H01Q21/067, H01Q21/068 take precedence
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

A feedthrough lens antenna includes first and second phased array antennas and a coupling structure connecting the first and second phased array antennas. Each phased array antenna may include a substrate and an array of dipole antenna elements on the substrate. Moreover, each dipole antenna element may include a medial feed portion and a pair of legs extending outwardly therefrom. Additionally, adjacent legs of the adjacent dipole antenna elements may include respective spaced apart end portions having predetermined shapes and relative positioning to provide increased capacitive coupling between the adjacent dipole antenna elements.

Claims

1. A feedthrough lens antenna comprising:

first and second phased array antennas, each comprising a substrate and an array of dipole antenna elements thereon, each dipole antenna element comprising a medial feed portion and a pair of legs extending outwardly therefrom, adjacent legs of adjacent dipole antenna elements including respective spaced apart end portions having predetermined shapes and relative positioning to provide increased capacitive coupling between the adjacent dipole antenna elements; and

a coupling structure connecting said first and second phased array antennas together in back-to-back relation.

2. The feedthrough lens antenna according to claim 1 wherein said coupling structure comprises a ground plane.

3. The feedthrough lens antenna according to claim 2 wherein each phased array antenna has a desired frequency range;

and wherein said ground plane is spaced from each array of dipole antenna elements less than about one-half a wavelength of a highest desired frequency.

4. The feedthrough lens antenna according to claim 1 wherein said coupling structure further comprises a plurality of transmission elements each connecting a corresponding dipole antenna element of said first phased array antenna with a dipole antenna element of said second phased array antenna.

5. The feedthrough lens antenna according to claim 4 wherein said plurality of transmission elements comprise coaxial cables.

6. The feedthrough lens antenna according to claim 1 further comprising at least one dielectric layer on each array of dipole antenna elements.

7. The feedthrough lens antenna according to claim 1 wherein each leg comprises:

an elongated body portion; and

an enlarged width end portion connected to an end of the elongated body portion.

8. The feedthrough lens antenna according to claim 1 wherein the spaced apart end portions in adjacent legs comprise interdigitated portions.

9. The feedthrough lens antenna according to claim 8 wherein each leg comprises an elongated body portion, an enlarged width end portion connected to an end of the elongated body portion, and a plurality of fingers extending outwardly from said enlarged width end portion.

10. The feedthrough lens antenna according to claim 1 wherein each phased array antenna has a desired frequency range;

and wherein the spacing between the end portions of adjacent legs is less than about one-half a wavelength of a highest desired frequency.

11. The feedthrough lens antenna according to claim 1 wherein each array of dipole antenna elements comprises first and second sets of orthogonal dipole antenna elements to provide dual polarization.

12. The feedthrough lens antenna according to claim 1 wherein the elements of each array of dipole antenna elements are sized and relatively positioned so that each phased array antenna is operable over a frequency range of about 2 to 30 GHz.

13. The feedthrough lens antenna according to claim 1 wherein said dipole antenna elements are sized and relatively positioned so that each phased array antenna is operable over a scan angle of about ±

60 degrees.

14. A feedthrough lens antenna comprising:

first and second phased array antennas each comprising an array of dipole antenna elements, each dipole antenna element comprising a medial feed portion and a pair of legs extending outwardly therefrom, adjacent legs of adjacent dipole antenna elements including respective spaced apart interdigitated end portions having predetermined shapes and relative positioning to provide increased capacitive coupling between the adjacent dipole antenna elements; and

a coupling structure connecting said first and second phased array antennas together in back-to-back relation.

15. The feedthrough lens antenna according to claim 14 wherein said coupling structure comprises a ground plane.

16. The feedthrough lens antenna according to claim 15 wherein each phased array antenna has a desired frequency range;

and wherein said ground plane is spaced from each array of dipole antenna elements less than about one-half a wavelength of a highest desired frequency.

17. The feedthrough lens antenna according to claim 14 wherein said coupling structure comprises a plurality of transmission elements each connecting a corresponding dipole antenna element of said first phased array antenna with a dipole antenna element of said second phased array antenna.

18. The feedthrough lens antenna according to claim 17 wherein said plurality of transmission elements comprise coaxial cables.

19. The feedthrough lens antenna according to claim 14 further comprising at least one dielectric layer on each array of dipole antenna elements.

20. The feedthrough lens antenna according to claim 14 wherein each leg comprises:

an elongated body portion; and

an enlarged width end portion connected to an end of the elongated body portion.

21. The feedthrough lens antenna according to claim 14 wherein each of said first and second phased array antennas further comprises a substrate carrying said array of dipole antenna elements.

22. The feedthrough lens antenna according to claim 14 wherein each leg comprises an elongated body portion, an enlarged width end portion connected to an end of the elongated body portion, and a plurality of fingers extending outwardly from said enlarged width end portion.

23. The feedthrough lens antenna according to claim 14 wherein each phased array antenna has a desired frequency range;

and wherein the spacing between the end portions of adjacent legs is less than about one-half a wavelength of a highest desired frequency.

24. The feedthrough lens antenna according to claim 14 wherein each array of dipole antenna elements comprises first and second sets of orthogonal dipole antenna elements to provide dual polarization.

25. The feedthrough lens antenna according to claim 14 wherein the elements of each array of dipole antenna elements are sized and relatively positioned so that each phased array antenna is operable over a frequency range of about 2 to 30 GHz.

26. The feedthrough lens antenna according to claim 14 wherein said dipole antenna elements are sized and relatively positioned so that each phased array antenna is operable over a scan angle of about ±

60 degrees.

27. A method for making a feedthrough lens antenna comprising:

providing first and second substrates;

forming an array of dipole antenna elements on each of the first and second substrates to define first and second phased array antennas, each dipole antenna element comprising a medial feed portion and a pair of legs extending outwardly therefrom, and positioning and shaping respective spaced apart end portions of adjacent legs of adjacent dipole antenna elements to provide increased capacitive coupling between the adjacent dipole antenna elements; and

connecting the first and second phased array antennas together in back-to-back relation.

28. The method according to claim 27 wherein connecting the first and second phased array antennas comprises connecting a ground plane between the first and second phased array antennas.

29. The method according to claim 28 wherein each phased array antenna has a desired frequency range;

and wherein the ground plane is spaced from each array of dipole antenna elements less than about one-half a wavelength of a highest desired frequency.

30. The method according to claim 27 wherein connecting the first and second phased array antennas comprises connecting each dipole antenna element of the first phased array antenna with a corresponding dipole antenna element of the second phased array antenna.

31. The method according to claim 30 wherein connecting comprises connecting each dipole antenna element of the first phased array antenna with the corresponding dipole antenna element of the second phased array antenna using a coaxial cable.

32. The method according to claim 27 further comprising forming at least one dielectric layer on each array of dipole antenna elements.

33. The method according to claim 27 wherein forming each array of dipole elements comprises forming each leg with an elongated body portion, and an enlarged width end portion connected to an end of the elongated body portion.

34. The method according to claim 27 wherein shaping and positioning respective spaced apart end portions comprises forming interdigitated portions.

35. The method according to claim 34 wherein forming each array of dipole antenna elements comprises forming each leg with an elongated body portion, an enlarged width end portion connected to an end of the elongated body portion, and a plurality of fingers extending outwardly from the enlarged width end portion.

36. The method according to claim 27 wherein each phased array antenna has a desired frequency range;

and wherein the spacing between the end portions of adjacent legs is less than about one-half a wavelength of a highest desired frequency.

37. The method according to claim 27 wherein forming each array of dipole antenna elements comprises forming first and second sets of orthogonal dipole antenna elements to provide dual polarization.

38. The method according to claim 27 wherein the elements of each array of dipole antenna elements are sized and relatively positioned so that each phased array antenna is operable over a frequency range of about 2 to 30 GHz.

39. The method according to claim 27 wherein the elements of each array of dipole antenna elements are sized and relatively positioned so that each phased array antenna is operable over a scan angle of about ±

60 degrees.