Half-loop antenna

• US 6,590,541 B1
• Filed: 09/18/2001
• Issued: 07/08/2003
• Est. Priority Date: 12/11/1998
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schultze, Ralf
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): TRAN, CHUC
• Application Number:
  US09/857,930
• Time in Patent Office: 658 Days
• Field of Search: 343/795, 343/741, 343/797, 343/700.MS, 343/742, 343/846, 343/853, 343/866, 343/828, 343/848, 343/745, 343/749
• US Class Current: 343/741
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 1/42 Housings not intimately mechanically associated with radiating elements, e.g. radome
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

The present invention relates to a half-loop antenna having an antenna half-loop positioned on top of a ground plane, the antenna half-loop forming an area whose outer edge forms a convex closed curve, that is, it is curved toward the outside. Preferably, the developed view of the conductor half-loop has the form of an ellipse tapering to a point at its ends, and at the feed-in point of the conductor half-loop an inductance can be inserted, formed as a spring.

Claims

1. A half-loop antenna, comprising:

a ground plane arranged as ground;

a metallic area including an outer edge forming a convex curve and being arched toward an outside; and

a metallic antenna half-loop arranged opposite the ground plane, the metallic antenna half-loop being connected at one end with the ground plane and having a connection to an antenna signal at another end, wherein the metallic antenna half-loop has the metallic area, the metallic area is positioned at an angle, and at least a portion of the metallic area is positioned parallel to the ground plane.

2. The half-loop antenna according to claim 1, wherein:

the metallic area is positioned arched outward with respect to the ground plane.

3. The half-loop antenna according to claim 1, wherein:

a developed view of the metallic antenna half-loop has a shape of an ellipse tapering to a point at ends thereof.

4. The half-loop antenna according to claim 1, further comprising:

a radom.

5. The half-loop antenna according to claim 4, wherein:

the radom acts includes a dielectric.

6. The half-loop antenna according to claim 4, wherein:

the metallic area is deposited on an inside of the radom.

7. The half-loop antenna according to claim 1, wherein:

the metallic area includes a dielectric on an outside thereof.

8. The half-loop antenna according to claim 1, further comprising:

a thin metallic conductor forming an outer edge of the metallic area, wherein;

the metallic antenna half-loop is realized as a skeleton antenna.

9. A half-loop antenna, comprising:

a ground plane arranged as ground;

a metallic area including an outer edge forming a convex curve and being arched toward an outside;

a metallic antenna half-loop arranged opposite the ground plane, the metallic antenna half-loop being connected at one end with the ground plane and having a connection to an antenna signal at another end, wherein the metallic antenna half-loop has the metallic area, the metallic area is positioned at an angle, and at least a portion of the metallic area is positioned parallel to the ground plane; and

an inductance inserted at the other end of the metallic antenna half-loop.

10. The half-loop antenna according to claim 9, further comprising:

another inductance at which is made a connection between the metallic antenna half-loop and the ground plane.

11. A half-loop antenna, comprising:

a ground plane arranged as ground;

a metallic area including an outer edge forming a convex curve and being arched toward an outside;

a metallic antenna half-loop arranged opposite the ground plane, the metallic antenna half-loop being connected at one end with the ground plane and having a connection to an antenna signal at another end, wherein the metallic antenna half-loop has the metallic area, the metallic area is positioned at an angle, and at least a portion of the metallic area is positioned parallel to the ground plane;

a radom; and

an inductance inserted at the other end of the metallic antenna half-loop, wherein;

the inductance includes a spring having a restoring force that presses at least a part of the metallic area, enclosed by the metallic antenna half-loop, against the radom.

12. A half-loop antenna, comprising:

a ground plane arranged as ground;

a metallic area including an outer edge forming a convex curve and being arched toward an outside;

a metallic antenna half-loop arranged opposite the ground plane, the metallic antenna half-loop being connected at one end with the ground plane and having a connection to an antenna signal at another end, wherein the metallic antenna half-loop has the metallic area, the metallic area is positioned at an angle, and at least a portion of the metallic area is positioned parallel to the ground plane;

a radom;

an inductance inserted at the other end of the metallic antenna half-loop; and

another inductance at which is made a connection between the metallic antenna half-loop and the ground plane, wherein;

each one of the inductance and the other inductance includes a respective spring respectively having a restoring force that presses at least part of the metallic area, enclosed by the metallic antenna half-loop against the radom.

13. A half-loop antenna, comprising:

a ground plane arranged as ground;

a metallic area including an outer edge forming a convex curve and being arched toward an outside;

a metallic antenna half-loop arranged opposite the ground plane, the metallic antenna half-loop being connected at one end with the ground plane and having a connection to an antenna signal at another end, wherein the metallic antenna half-loop has the metallic area, the metallic area is positioned at an angle, and at least a portion of the metallic area is positioned parallel to the ground plane;

antenna terminals; and

a feed network inserted between the metallic antenna half-loop and one of the antenna terminals and including at least one first resonant circuit that includes an inductance and a capacitance.

14. The half-loop antenna according to claim 13, wherein:

the at least one first resonant circuit is formed as a parallel resonant circuit.

15. The half-loop antenna according to claim 13, wherein:

the at least one first resonant circuit is formed as a series resonant circuit.

16. The half-loop antenna according to claim 13, wherein:

the feed network is connected to a feed-in point.

17. The half-loop antenna according to claim 13, wherein:

the feed network is connected to the ground plane.

18. The half-loop antenna according to claim 13, wherein:

the feed network includes at least one first additional impedance that is selected so that the feed network is adjusted to a predefined impedance at the antenna terminals connected to the feed network.

19. The half-loop antenna according to claim 18, wherein:

the at least one first additional impedance is positioned according to one of;

in a leg of the at least one first resonant circuit,

in series to the at least one first resonant circuit, and

parallel to the at least one first resonant circuit.

20. The half-loop antenna according to claim 13, wherein:

the feed network includes a plurality of resonant circuits of diversified resonant frequencies.

21. The half-loop antenna according to claim 20, wherein:

two of the plurality of resonant circuits are parallel resonant circuits that are connected in series.

22. The half-loop antenna according to claim 20, wherein:

two of the plurality of resonant circuits are series resonant circuits that are connected in parallel.

23. The half-loop according to claim 20, wherein:

the plurality of resonant circuits includes a series resonant circuit and a parallel resonant circuit connected one of parallel and in series with respect to each other.

24. The half-loop antenna according to claim 20, further comprising:

a series resonant circuit, wherein;

the plurality of resonant circuits includes a series circuit formed of a plurality of parallel resonant circuits, and

the series resonant circuit is connected in parallel to the series circuit.