Portable device compact antenna
AssigneeThomson Licensing
InventorsPhilippe Minard, Jean-Francois Pintos, Ali Louzir
Life of this patent
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Abstract
The present invention relates to a portable compact antenna comprising a first radiating element of the dipole type, operating in a first frequency band and formed by a first and at least one second conductive arm supplied differentially, the first arm, called cold arm, forming at least one cover for an electronic card wherein the second arm, called hot arm, is extended by a conductive wire element, the length of the assembly formed by the first arm, the second arm and the wire element being chosen to provide an operation in a second frequency band.
Claims9
1- A portable compact antenna comprising a first radiating element of the dipole type, operating in a first frequency band and formed by a first arm and at least one second conductive arm supplied differentially, the first arm, called cold arm, forming at least one cover for an electronic card wherein the second arm, called hot arm, is extended by a conductive wire element, the length of the assembly formed by the first arm, the second arm and the wire element being chosen to provide an operation in a second frequency band.
2- The antenna of claim 1, wherein the length of the assembly equals λ2/(2×(1+α)) where λ2 is the wavelength at the central frequency of the second frequency band and α is a coefficient between 0 and 1.
3- The antenna of claim 2, wherein α is between 0.15 and 0.2.
4- The antenna of claim 1, wherein the first frequency band is the UHF band and the second frequency band is the VHF band.
5- The antenna of claim 4, wherein the VHF frequency band is the VHF-III band.
6- The antenna of claim 1, wherein the wire element is inserted next to a slot provided in the hot arm.
7- The antenna of claim 1, wherein the wire element is formed by retractable elements in a sleeve integral with the hot arm.
8- The antenna of claim 1, wherein the first radiating element comprises two second arms mounted in rotation at one extremity of the first arm, each second arm being extended by a wire element.
9- The antenna of claim 1, wherein the first and second arms each have a length equal to λ¼ where λ1 is the wavelength at the central frequency of the first frequency band.