Hybrid antenna arrangement for use with electronic identification systems
First Claim
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1. A dipole antenna comprising:
- a first pole comprising an electrically conductive loop having no more than one interruption and providing a high impedance feed mechanism for the antenna at a feedpoint on the loop; and
a second pole comprising an electrically conductive appendage galvanically connected to the loop in a connection region on the loop and extending outwardly from the loop, the loop and the appendage forming part of a layer on a substrate;
the feedpoint being circumferentially spaced on the loop from the connection region;
thereby to provide an off-center fed dipole antenna with the feed point at a higher impedance than the connection region.
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Abstract
A dipole antenna 34 comprises a loop 36 as a first pole and an appendage 42 comprising a strip 44 terminating in a pad 46 as a second pole. The circumference of the loop is in the order of one half-wavelength of an operating frequency and an effective length of the appendage is at least 0.15 times the wavelength. The dipole antenna 34 is shorter than conventional half-wavelength dipole antennas, has a better frequency response and the antenna impedance ZA is dependent on the position of a feedpoint 38 in the loop 36. The antenna may be used with transponders for electronic radio frequency identification systems.
62 Citations
13 Claims
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1. A dipole antenna comprising:
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a first pole comprising an electrically conductive loop having no more than one interruption and providing a high impedance feed mechanism for the antenna at a feedpoint on the loop; and
a second pole comprising an electrically conductive appendage galvanically connected to the loop in a connection region on the loop and extending outwardly from the loop, the loop and the appendage forming part of a layer on a substrate;
the feedpoint being circumferentially spaced on the loop from the connection region;
thereby to provide an off-center fed dipole antenna with the feed point at a higher impedance than the connection region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A transponder of an electronic identification system comprising:
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a chip having an input impedance; and
a dipole antenna comprising;
a first pole comprising an electrically conductive loop having no more than one interruption and providing a high impedance feed mechanism with an antenna impedance for the antenna at a feed point on the loop; and
a second pole comprising an electrically conductive appendage galvanically connected to the loop in a connection region on the loop and extending outwardly from the loop;
the feedpoint being circumferentially spaced on the loop from the connected region;
thereby to provide an off-center fed dipole antenna with the feed point at a higher impedance than the connection region;
the chip being connected to the antenna at the feedpoint and the input impedance of the chip and the antenna impedance being at least 400Ω
.- View Dependent Claims (12, 13)
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Specification
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Current AssigneeZebra Technologies Corporation
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Original AssigneeSupersensor Limited
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InventorsFourie, Andries Petrus Cronje, Proctor, David Edwin, Turner, Christopher Gordon Gervase
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Primary Examiner(s)Wimer, Michael C.
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Application NumberUS09/495,456Time in Patent Office742 DaysField of SearchH01/Q.138, 343/802, 343/803, 343/804, 343/795US Class Current343/795CPC Class CodesG06K 7/10346 the antenna being of the fa...H01Q 1/2225 used in active tags, i.e. p...H01Q 9/28 Conical, cylindrical, cage,...
