Phase shifters deposited en masse for an electronically scanned antenna

• US 7,324,043 B2
• Filed: 09/02/2005
• Issued: 01/29/2008
• Est. Priority Date: 09/02/2005
• Status: Active Grant

• Current Assignee: Aptiv Technologies AG
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Purden, George J., Shi, Shawn
• Primary Examiner(s): Sotomayor; John B
• Application Number:
  US11/219,400
• Publication Number:
  US 20070052592A1
• Time in Patent Office: 879 Days
• Field of Search: 342/175, 342/74, 342/81, 342/157, 342/158, 342368-374, 257/275, 257/618, 257/656, 327/237, 327/493, 327/503, 327/504, 327/583, 331/107.DP, 331/176, 333/156, 333/229, 333/233, 343/700.MS, 343/701, 343/754, 343/853
• US Class Current: 342/175
• CPC Class Codes: H01P 1/181 using ferroelectric devices
• CPC Class Codes: H01Q 21/0075 Stripline fed arrays H01Q21/065 takes precedence
• CPC Class Codes: H01Q 21/0087 Apparatus or processes specially adapted for manufacturing antenna arrays manufacturing waveguides H01P11/00
• CPC Class Codes: H01Q 21/065 Patch antenna array
• CPC Class Codes: H01Q 3/44 varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element

Abstract

A system and method for an electronically scanned antenna is provided in which phase shifters are deposited en masse along with other electronically scanned antenna components on a wafer scale substrate using a thin film process. Alternative wafer scale sizes may be utilized to furnish a required antenna aperture area. Significant processing costs for radar and communication systems are saved utilizing the present invention as compared with contemporary discrete phase shifters that are individually mounted on an antenna. In an aspect, the phase shifter is made up of a base electrode, a barium strontanate titanate (BST) ferroelectric varactor and a top electrode. The BST ferroelectric material is a voltage variable dielectric, which generates a radiation phase. The radiation phase is regulated by a phase shifter control. The radiation phase generates an electromagnetic field about a radiating element and electromagnetic radio waves are radiated from the radiating element.

Claims

1. An electronically scanned antenna comprising:

a first electrode having a radio frequency input;

a variable capacitor for generating a radiation phase, the variable capacitor formed by the first electrode, a ferroelectric material and a second electrode, wherein the ferroelectric material is situated adjacent to, and separates, the first electrode and the second electrode;

a phase shifter control connection for regulating the radiation phase; and

a radiating element for radiating electromagnetic radio waves from an electromagnetic field about the radiating element generated by the radiation phase, wherein a plurality of the variable capacitor, the phase shifter control connection, and the radiating element are fabricated en masse in a series of depositions.

2. The electronically scanned antenna as in claim 1, wherein the first electrode, the second electrode and the ferroelectric material are formed to a wafer scale substrate utilizing a thin film process including one of sputtering and chemical vapor deposition.

3. The electronically scanned antenna as in claim 1, wherein the ferroelectric material comprises barium strontanate titanate.

4. The electronically scanned antenna as in claim 2, wherein the substrate is at least one of sapphire, quartz and glass.

5. The electronically scanned antenna as in claim 1, wherein the phase shifter control connection is connected to the variable capacitor via the radiating element.

6. The electronically scanned antenna as in claim 1, wherein individually the radiating elements are joined to the variable capacitors for scanning in two dimensions.

7. The electronically scanned antenna as in claim 1, wherein a frequency of one of 24 GHz and 76 GHz is substantially radiated from the radiating element.

8. A phase shifter for an electronically scanned antenna comprising:

a variable capacitor for generating a radiation phase, the variable capacitor formed by a first electrode having a radio frequency input, a ferroelectric material and a second electrode, wherein the ferroelectric material is situated adjacent to, and separates, the first electrode and the second electrode, and wherein a plurality of the variable capacitor are fabricated en masse in a series of depositions with a phase shifter control connection for regulating the radiation phase and a radiating element for radiating electromagnetic radio waves from an electromagnetic field about the radiating element generated by the radiation phase.

9. The phase shifter as in claim 8, wherein the first electrode, the second electrode and the ferroelectric material are formed to a wafer scale substrate utilizing a thin film process including one of sputtering and chemical vapor deposition.

10. The phase shifter as in claim 8, wherein the ferroelectric material comprises barium strontanate titanate.

11. The phase shifter as in claim 9, wherein the substrate is at least one of sapphire, quartz and glass.

12. The phase shifter as in claim 8, wherein the phase shifter control connection is connected to the variable capacitor via the radiating element.

13. The phase shifter as in claim 8, wherein individually the radiating elements are joined to the variable capacitors for scanning in two dimensions.

14. The phase shifter as in claim 8, wherein a frequency of one of 24 GHz and 76 GHz is substantially radiated from the radiating element.

15. A method of forming an electronically scanned antenna comprising:

depositing a first electrode to a substrate;

depositing a ferroelectric material to the first electrode;

depositing a second electrode to the ferroelectric layer; and

depositing a radiating element to the second electrode, wherein the radiating element includes a phase shifter control connection for regulating the radiation phase, wherein the first electrode includes a radio frequency input, wherein a variable capacitor, for generating a radiation phase, is formed by the first electrode, the ferroelectric material and the second electrode, and wherein a plurality of the variable capacitor are fabricated en masse with the phase shifter control connection and the radiating element.

16. The method as in claim 15, wherein the first electrode, the second electrode and the ferroelectric material are formed to a wafer scale substrate utilizing a thin film process including one of sputtering and chemical vapor deposition.

17. The method as in claim 15, wherein the ferroelectric material comprises barium strontanate titanate.

18. The method as in claim 16, wherein the substrate comprises at least one of sapphire, quartz and glass.

19. The method as in claim 15, wherein the phase shifter control is connected to the variable capacitor via the radiating element.

20. The method as in claim 15, wherein individually the radiating elements are joined to the variable capacitors for scanning in two dimensions.