Dipole antenna

Abstract

A conductor for use as a radiator in an antenna has a contact section adapted to connect to a high-frequency source, a first section of alternating shape extending along a first longitudinal axis from an inner end at the contact section to an outer end, and a second section of alternating shape extending along a second longitudinal axis generally coplanar with and parallel to the first axis from the first-section outer end toward the contact section. It can also have a third section of alternating shape extending along a third longitudinal axis generally coplanar with and parallel to the first and second axes from the contact section and having an outer end flanked by the first and second sections.

Description

BRIEF DESCRIPTION OF THE DRAWING

The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:

FIG. 1 is a schematic diagram of a dipole antenna according to the invention connected to a high-frequency source;

FIGS. 2, 3, 4, 5, and 6 are schematic views of different antennas in accordance with the invention; and

FIG. 7 is a graph showing usable frequency bands for a multiband dipole antenna according to FIG. 6.

Claims

1. A conductor for use as a radiator in an antenna, the conductor having; a contact section adapted to connect to a high-frequency source;a first section of alternating shape extending along a first longitudinal axis from an inner end at the contact section to an outer end; anda second section of alternating shape extending along a second longitudinal axis generally coplanar with and parallel to the first axis from the first-section outer end toward the contact section.

2. The antenna conductor defined in claim 1 wherein the alternating shape is a zigzag or meander.

3. The antenna conductor defined in claim 1 wherein at least one of the first and second sections has a plurality of straight subsections all lying in the plane and mostly extending nonparallel to the respective longitudinal axis.

4. The antenna conductor defined in claim 1 wherein at least one of the first and second sections has subsections not lying in the plane.

5. The antenna conductor defined in claim 1 wherein the sections are formed of printed-circuit traces on a printed-circuit board.

6. The antenna conductor defined in claim 1 wherein the sections are rigid and self-supporting, being anchored at the contacting section.

7. The antenna conductor defined in claim 1 wherein the sections are formed as sheet-metal stampings.

8. The antenna conductor defined in claim 1, further comprising a bridge section extending transversely between the first-section outer end and an outer end of the second section.

9. The antenna conductor defined in claim 8 wherein the bridge section extends straight in the plane.

10. The antenna conductor defined in claim 8 wherein the bridge section lies in the plane but is of alternating shape centered on a transverse axis lying in the plane.

11. A conductor for use as a radiator in an antenna, the conductor having; a contact section adapted to connect to a high-frequency source;a first section of alternating shape extending along a first longitudinal axis from an inner end at the contact section to an outer end;a second section of alternating shape extending along a second longitudinal axis generally coplanar with and parallel to the first axis from the first-section outer end toward the contact section;a bridge section extending transversely between the first-section outer end and an outer end of the second section; anda third section of alternating shape extending along a third longitudinal axis generally coplanar with and parallel to the first and second axes from the contact section and having an is outer end flanked by the first and second sections.

12. The antenna conductor defined in claim 11 wherein the combined longitudinal lengths the second and third sections is greater than that of the first section.

13. A dipole antenna comprising two conductors as defined in claim 11.

14. The dipole antenna defined in claim 13, further comprising: fourth and fifth sections between and respective adjacent the first and third sections and extending along respective fourth and fifth longitudinal axes generally parallel to and coplanar with the first, second, and third longitudinal axes.

15. The dipole antenna defined in claim 13 wherein the two conductors symmetrically flank a center immediately adjacent and between both contact regions.