Antenna with curved dipole elements

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EP 0 431 764 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	13.11.1991 Bulletin 1991/46

(43)	Date of publication A2:
	12.06.1991 Bulletin 1991/24

(21)	Application number: 90312325.5

(22)	Date of filing: 12.11.1990

(51)	International Patent Classification (IPC)⁵: H01Q 21/20, H01Q 21/26

(84)	Designated Contracting States:
	AT BE CH DE DK ES FR GB GR IT LI LU NL SE

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Priority:

04.12.1989 US 445754

(71)	Applicant: TRIMBLE NAVIGATION
	Sunnyvale, California 94088 (US)

(72)	Inventors:
	Rodal, Eric B. Cupertino, CA 95014 (US) Detro, Michael C. Los Gatos, CA 95030 (US) Gildea, David R. Menlo Park, CA 94025 (US) Janky, James M. Sunnyvale, CA 94087 (US)

(74)	Representative: Adams, William Gordon et al
	RAWORTH, MOSS & COOK 36 Sydenham Road Croydon Surrey CR0 2EF Croydon Surrey CR0 2EF (GB)

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References cited: :

(54)	Antenna with curved dipole elements

(57) An antenna comprises a base plate (20) forming a ground plane, a coaxial feed serving as a mast (22) connected to the base plate (20) and extending along an axis that is normal to the ground plane, and two orthogonal dipoles (24, 26) each formed of two elements. Each dipole element has a first end connected to and supported by the mast at a first location spaced apart from the ground plane by a predetermined distance and a second end closer to the ground plane and exhibits a curvature in a plane containing the mast.

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