Hand-held transmitting and/or receiving apparatus

• US 5,886,668 A
• Filed: 08/19/1997
• Issued: 03/23/1999
• Est. Priority Date: 03/08/1994
• Status: Expired due to Term

• Current Assignee: Telit Communications PLC
• Original Assignee: Hagenuk Telecom GmbH
• Inventors: Thomsen, Jan Gert, Pedersen, Gert Fr.o slashed.lund
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): PHAN, THO GIA
• Application Number:
  US08/916,740
• Time in Patent Office: 581 Days
• Field of Search: 343/700 MS, 343/841, 343/702, 343/829, 343/846, 343/848
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence

Abstract

Hand-held transmitting and/or receiving apparatus, including a housing made of electrically non-conductive material, an electric circuit positioned within the housing, an electrical ground plane positioned within the housing, an antenna resonator element extending approximately parallel to the ground plane and having a first free end and a second end electrically connected by a ground connector to the ground plane and an arrangement for connecting the ground plane and the resonator element to the electric circuit. The resonator element, the ground plane and the ground connector are positioned about and fixed to a dielectric body positioned inside the housing. This antenna is easily manufactured and reduces the influence of mechanical tolerances and mechanical and thermal influences on the electrical parameters of the antenna.

Claims

1. A hand-held radio transceiver comprising:

a housing,

an electric circuit comprising a substrate positioned within the housing and supporting electric circuit components thereon,

a conductive covering separate from said housing, having first and second sides, a first side positioned over said substrate and enclosing said electric circuit components,

an antenna system extending along the housing adjacent to said electric circuit, comprising a ground plane, wherein said conductive covering forms said ground plane, said antenna system further comprising

a resonant element extending generally parallel to the ground plane, the resonant element having a free end, said resonant element extending on said second side of said conductive covering forming said ground plane and opposite to said electric circuit, and

a ground connector extending between and electrically connecting the ground plane to the resonant element at a grounded location distal from said free end.

2. The hand-held radio transceiver of claim 1 wherein said ground plane defines a recess extending away from said electric circuit, said electric circuit being positioned within said recess.

3. The hand-held radio transceiver of claim 2 wherein said ground plane defines protrusions about said recess electrically contacting said electric circuit.

4. The hand-held radio transceiver of claim 1, wherein said antenna system further comprises a dielectric body, and said ground plane, resonant element and ground connector of said antenna system comprise electrically conductive layers on said dielectric body.

5. The hand-held radio transceiver of claim 1, wherein said housing is electrically non-conductive, and said antenna system is positioned inside of said housing.

6. The hand-held radio transceiver of claim 1, wherein said housing rear side has a width and said ground plane has a width substantially equal to the width of said housing rear side.

7. The hand-held radio transceiver of claim 1, wherein said ground plane has a width and said resonant element has a width substantially equal to the width of said ground plane.

8. The hand-held radio transceiver of claim 1, wherein said resonant element has a width and said ground connector has a width substantially equal to at least one-half the width of said resonant element.

9. The hand-held radio transceiver of claim 1, further comprising an elastic, electrically conductive element positioned between said electric circuit and said ground plane and forming an electrical connection therebetween.

10. The hand-held radio transceiver of claim 1, wherein said antenna system further comprises a feeder element electrically connecting the resonant element to the electric circuit without mechanically contacting the resonant element.

11. The hand-held radio transceiver of claim 10, further comprising an elastic, electrically conductive element positioned between said electric circuit and said feeder element and forming an electrical connection therebetween.

12. The hand-held radio transceiver of claim 1, wherein said resonant element of said antenna system further comprises a tuning stub projecting from said free end, said tuning stub having a width smaller than a width of said free end.

13. The hand-held radio transceiver of claim 1, wherein said resonant element has an arcuate surface contour between said grounded location and said free end.