Antenna using proximity-coupled feed method, RFID tag having the same, and antenna impedance matching method thereof
First Claim
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1. An antenna, comprising:
- a radiation patch for deciding a resonant frequency of the antenna;
a ground plate disposed in parallel to the radiation patch; and
a feeder disposed between the radiation patch and the ground plate in parallel for providing a RF signal to an element connected to the antenna,wherein the feeder includes;
a microstrip feed line proximately coupled to the radiation patch by being formed perpendicularly to the resonant length direction of the radiation patch anda ground side disposed to be separated in the ground plate direction from the feed line in parallel wherein the ground side of the feeder is shorted from the ground plate in a direct current (DC) manner.
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Abstract
An antenna, a RFID tag using the same, and an antenna impedance matching method thereof are provided. The antenna includes: a radiation patch for deciding a resonant frequency of the antenna; a ground plate disposed in parallel to the radiation patch; and a feeder disposed between the radiation patch and the ground plate in parallel for providing a RF signal to an element connected to the antenna, wherein the feeder includes a microstrip feed line proximately coupled to the radiation patch by being formed perpendicularly to the resonant length direction of the radiation patch.
17 Citations
43 Claims
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1. An antenna, comprising:
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a radiation patch for deciding a resonant frequency of the antenna; a ground plate disposed in parallel to the radiation patch; and a feeder disposed between the radiation patch and the ground plate in parallel for providing a RF signal to an element connected to the antenna, wherein the feeder includes; a microstrip feed line proximately coupled to the radiation patch by being formed perpendicularly to the resonant length direction of the radiation patch and a ground side disposed to be separated in the ground plate direction from the feed line in parallel wherein the ground side of the feeder is shorted from the ground plate in a direct current (DC) manner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An antenna, comprising:
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a radiation patch for deciding a resonant frequency of the antenna; a ground plate disposed in parallel to the radiation patch; and a feeder disposed between the radiation patch and the ground plate in parallel for providing a RF signal to an element connected to the antenna, wherein the feeder includes; a microstrip feed line proximately coupled to the radiation patch by being formed perpendicularly to the resonant length direction of the radiation patch, and a ground side disposed to be separated in the ground plate direction from the feed line in parallel, wherein the ground side of the feeder is shorted from the ground plate in an alternating current (AC) manner through a capacitive coupling. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An antenna, comprising:
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a radiation patch for deciding a resonant frequency of the antenna; a ground plate disposed in parallel to the radiation patch; and a feeder disposed between the radiation patch and the ground plate in parallel for providing a RF signal to an element connected to the antenna, wherein the feeder includes a microstrip feed line proximately coupled to the radiation patch by being formed perpendicularly to the resonant length direction of the radiation patch, and wherein the impedance of the antenna is controlled using a characteristic that a real number part of antenna impedance varies according to a coupling capacitance between the radiation patch and the feed line where the coupling capacitance decides a coupling amount of the feed line and an equivalent impedance between the radiation patch and the ground plate. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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35. An antenna, comprising:
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a radiation patch for deciding a resonant frequency of the antenna; a ground plate disposed in parallel to the radiation patch; and a feeder disposed between the radiation patch and the ground plate in parallel for providing a RF signal to an element connected to the antenna, wherein the feeder includes a microstrip feed line proximately coupled to the radiation patch by being formed perpendicularly to the resonant length direction of the radiation patch, and wherein the impedance of the antenna is controlled using a characteristic that an imaginary number part of the antenna impedance varies according to a characteristic impedance of the feed line. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
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Specification