Ferroelectric phase shifting antenna array

• US 5,617,103 A
• Filed: 07/19/1995
• Issued: 04/01/1997
• Est. Priority Date: 07/19/1995
• Status: Expired due to Fees

• Current Assignee: United States Department of the Army
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Drach, William C., Tadross, Michael, Koscica, Thomas E.
• Primary Examiner(s): Wimer, Michael C.
• Application Number:
  US08/504,163
• Time in Patent Office: 622 Days
• Field of Search: 343/700 MS, 333/161, 333/164, 333/18
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 3/36 with variable phase-shifters
• CPC Class Codes: H01Q 3/44 varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
• CPC Class Codes: H01Q 9/045 with particular feeding means for circular polarisation H01Q9/0428

Abstract

A ferroelectric phase shifting antenna array consists of a plurality of lrally spaced antenna patches which have respective ferroelectric components abutting an edge of each patch at a near central location on the edge to provide impedance matching. DC control power lines are connected to the center voltage null position of the resonant mode of the antenna patch. An Rf source is connected to the other ends of the ferroelectric components through quarter wave coupled lines which provides simultaneous impedance matching and DC isolation.

Claims

1. A ferroelectric antenna comprising a rectangular antenna patch, an input source of Rf energy, a ferroelectric component having one end connected to said patch and a second end connected to said input source of Rf energy, a DC control source for varying the dielectric constant of said ferroelectric component, and a dielectric substrate support for supporting said antenna patch and said ferroelectric component;

said rectangular antenna patch having at least two non-coincident resonant modes;

said DC control source connected to a side of said rectangular antenna patch which is at least close to or coincident with a voltage null position of one of said resonant modes.

2. The antenna of claim 1, wherein said one end of said ferroelectric component is connected to an edge of said antenna patch which is at a location where the impedance of said ferroelectric component is about most closely matched to that of said antenna patch.

3. The antenna of claim 2, which further includes a pair of quarter wave long coupled lines for coupling said Rf source to said second end of said ferroelectric component;

said quarter wave long coupled lines acting as a DC isolation element and as an impedance matching element.

4. A ferroelectric phase shifting antenna array comprising, in combination:

a source of Rf energy, a plurality of rectangular antenna patches, a plurality of ferroelectric components each having one end connected to a corresponding one of said antenna patches and a second end connected to said source of Rf energy, a DC source for controlling the dielectric constant of said plurality of ferroelectric components, and a dielectric support for supporting said antenna patches in a spaced, coplanar array, and for supporting said plurality of ferroelectric components;

each of said rectangular antenna patches having at least two non-coincident resonant modes;

said DC control source being connected to an edge of each of said rectangular antenna patches which is close to or coincident with a voltage null position of one of said resonant modes.

5. The antenna array of claim 4, wherein said one end of each of said ferroelectric components are connected to an edge of their respective said antenna patches which is at a location where the impedance of each said ferroelectric components is about most closely matched to that each of said antenna patches.

6. The antenna array of claim 4 which further includes pairs of quarter wave long coupled lines for coupling said Rf source to respective ones of said second ends of respective said ferroelectric components.

7. The antenna array of claim 5 which further includes pairs of quarter wave long coupled lines for coupling said Rf source to respective ones of said second ends of respective said ferroelectric components.

8. The antenna array of claim 4 which further includes means for individually controlling the DC energy applied to each of said ferroelectric components.