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Antenna device having a matching means

  • US 5,973,646 A
  • Filed: 05/02/1997
  • Issued: 10/26/1999
  • Est. Priority Date: 05/03/1996
  • Status: Expired due to Fees
First Claim
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1. An antenna device for a portable radio communication device operating within UHF or adjacent frequency ranges, comprising:

  • a housing having mounting means for mounting on a radio communication device,a radiating first element carried by the housing,the first element having a first feed point at which it exhibits a first impedance Z1,an impedance matching means carried by the housing adjacent to the first feed point and having first and second coupling means exhibiting essentially the first impedance Z1 and a second impedance Z2, respectively,the first coupling means connected to the first feed point,the second coupling means including first and second conductive members to be connected to the radio communication device,the impedance matching means including at least one reactive element connected between the first and second coupling means,the impedance matching means including a dielectric substrate carried by the housing,the substrate carrying the reactive element(s) and a conductor pattern, which interconnects the reactive element(s) and the coupling means,the substrate has an at least partly circular outer edge for mounting in a corresponding groove or recess in a base of the housing, andthe substrate is mounted substantially perpendicular to a direction in which the first element extends.

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