Transponder antenna
First Claim
1. In combination, a thin planar dielectric member,first conductive material on a first portion of one surface of the planar member,second conductive material on a second portion of the other surface of the planar to define with the first conductive material a first antenna operative at first frequencies, the second portion being displaced from the first portion in a first direction along the planar surfaces of the dielectric member, andslots included in the first conductive material to define a conductive portion which extends from the first portion to a position of the first planar surface opposite to the second portion on the second planar surface and which defines a second antenna operative at second frequencies higher than the first frequencies.
20 Assignments
0 Petitions
Accused Products
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.
123 Citations
16 Claims
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1. In combination, a thin planar dielectric member,
first conductive material on a first portion of one surface of the planar member, second conductive material on a second portion of the other surface of the planar to define with the first conductive material a first antenna operative at first frequencies, the second portion being displaced from the first portion in a first direction along the planar surfaces of the dielectric member, and slots included in the first conductive material to define a conductive portion which extends from the first portion to a position of the first planar surface opposite to the second portion on the second planar surface and which defines a second antenna operative at second frequencies higher than the first frequencies.
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5. In combination,
a thin dielectric member having first and second oppositely disposed planar surfaces, an electrically conductive material on the first planar surface of the dielectric member at a first end of the first surface, an electrically conductive material on the second planar surface of the dielectric member at a second end of the second surface, the second end being opposite to the first end in a first direction along the planar surface, the first and second conductive materials defining a first antenna operative at a first frequency, and spaced slots in the conductive material on the first planar surface to produce a conductive portion first defines a second antenna operative at a second frequency higher than the first frequency.
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10. In combination,
a thin flat dielectric member having first and second substantially parallel surfaces, conductive material on the first surface of the dielectric member at a first end of the first surface, conductive material on the second surface of the dielectric member at a second end of the second surface to define, with the conductive material on the first surface, an antenna operative at a first frequency, the first and second ends being opposite from each other in a first direction, and slots in the conductive material on the first surface of the dielectric member to define a second antenna operative at a second frequency higher than the first frequency and defining the impedance of the second antenna, and additional conductive material disposed on the first surface of the dielectric member to define the impedance of the first antenna.
Specification