Importance

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Abstract

A dielectric member may be thin and planar and may have first and second opposite surfaces. An electrically conductive material is disposed on the first surface at one end of the first surface and an electrically conductive material is disposed on the second surface at the opposite end of the second surface. The conductive materials in the first and second surfaces define a first antenna operative at a first frequency. Slots are provided in the conductive material in the first surface. The slots define a second antenna operative at a second frequency greater than the first frequency. The slots include first and second slots extending in a direction transverse to the relative direction of the conductive materials on the first and second surfaces. The first and second slots may have substantially equal lengths and may be aligned with each other. The slots also include third and fourth slots extending in such relative direction and respectively communicating with the first and second slots. The third and fourth slots are in spaced and parallel relationship to define a conductive portion. The lengths of the first and second slots define the frequency of the signals from the second antenna and the lengths of the third and fourth slots define the impedance of the second antenna. Additional conductive material is disposed on the first surface of the dielectric member in electrical communication with the conductive portion. The additional conductive material is disposed opposite the conductive material on the second surface and is provided with a length defining the impedance of the first antenna.

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First Claim