Antenna of small volume for a portable radio appliance

• US 20040119651A1
• Filed: 05/09/2003
• Published: 06/24/2004
• Est. Priority Date: 12/23/2002
• Status: Active Grant

• Current Assignee: Amphenol Socapex (Amphenol Corporation)
• Original Assignee: Amphenol Socapex (Amphenol Corporation)
• Inventors: Leclerc, Daniel, Vincent, Roland, Annabi, Ayoub
• Granted Patent: US 6,927,731 B2
• Time in Patent Office: Days
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/145 by varying the electrical length
• 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 provides a very small volume and broad band antenna for a portable appliance including a transceiver module with an independent ground and an antenna feed conductor, the antenna comprising a first conductive surface lying substantially in a first geometrical surface of non-closed curvilinear shape surrounding an inside space and connectable to the independent ground of the transceiver module of the appliance; and a second conductive surface disposed substantially in a second geometrical surface substantially coinciding with the first geometrical surface and situated in the inside space, and forming a radiating assembly connectable to the antenna feed conductor; whereby the antenna is semi-independent of the elements of the appliance.

Claims

1. / A very small volume and broad band antenna for a portable appliance including a transceiver module with an independent ground and an antenna feed conductor, the antenna comprising:

a first conductive surface lying substantially in a first geometrical surface of non-closed curvilinear shape surrounding an inside space and connectable to said independent ground of the transceiver module of said appliance; and

a second conductive surface disposed substantially in a second geometrical surface substantially coinciding with said first geometrical surface and situated in said inside space, and forming a radiating assembly connectable to said antenna feed conductor;

whereby said antenna is semi-independent of the elements of said appliance.

2. / An antenna according to claim 1, wherein said first surface is generally in the form of a non-closed conductive strip whose mean line is polygonal in shape, defining an opening between its two ends.

3. / An antenna according to claim 2, wherein said opening is of a length no greater than 3 mm.

4. / An antenna according to claim 2, wherein said second surface defines at least two radiating elements of lengths adapted to resonate in the working frequency ranges of the antenna.

5. / An antenna according to claim 1, wherein said second surface defines a connection zone and a plurality of radiating elements corresponding to working frequency ranges.

6. / An antenna according to claim 4, wherein the strip forming said first surface is tuned to one of the radiating elements.

7. / An antenna according to claim 6, wherein said first surface further comprises at least one conductive extension in addition to said strip, the extension being electrically connected to said strip.

8. / An antenna according to claim 1, further comprising at least one active or passive component electrically connected to at least one of said conductive surfaces.

9. / An antenna according to claim 8, wherein said component is active and the DC power supply for said active component is delivered via the radiofrequency coaxial feed to the antenna.

10. / An antenna according to claim 1, further comprising a coaxial connector connected to each of said conductive surfaces.

11. / An antenna according to claim 1, further comprising a two-channel connector, each channel being respectively connected to one of said two conductive surfaces.

12. / An antenna according to claim 1, further comprising a rigid or flexible insulating support having said first and second conductive surfaces made on one of its faces.

13. / An antenna according to claim 1, wherein said conductive surfaces are made of machined conductive sheet metal.

14. / An antenna according to claim 1, wherein said geometrical surfaces are curved.

15. / An antenna according to claim 1, wherein said geometrical surfaces are plane.