PIFA, RFID tag using the same and antenna impedance adjusting method thereof
First Claim
1. A Planar Inverted-F Antenna (PIFA), comprising:
- a radiation patch having a radiating edge and a non-radiating edge;
a grounding surface;
at least one shorting plate for shorting the radiation patch from the grounding surface;
a feeder for providing radio frequency (RF) power to the radiation patch; and
a meander line extended from the radiating edge toward the grounding surface and positioned with a predetermined distance from the grounding surface.
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Accused Products
Abstract
Provided are a Planar Inverted-F Antenna (PIFA), a Radio Frequency Identification (RFID) tag using the PIFA. The present invention miniaturizes the antenna by using a meander line extended from a radiating edge of a radiation antenna and adjusting a resonant frequency of the antenna, and it performs impedance matching by adjusting capacitive reactance of the antenna. Also, it can perform impedance matching by using a stub having a slot formed therein and adjusting inductive reactance and capacitive reactance of the antenna. The present invention miniaturizes the antenna by using a plurality of shorting plates for shorting the radiation patch from a grounding surface and adjusting the resonant frequency of the antenna. The present invention also provides an inexpensive PIFA antenna with an excellent radiation efficiency by forming the radiation patch in the form of metal sheet in the antenna and floating the radiation patch in the air.
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Citations
28 Claims
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1. A Planar Inverted-F Antenna (PIFA), comprising:
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a radiation patch having a radiating edge and a non-radiating edge;
a grounding surface;
at least one shorting plate for shorting the radiation patch from the grounding surface;
a feeder for providing radio frequency (RF) power to the radiation patch; and
a meander line extended from the radiating edge toward the grounding surface and positioned with a predetermined distance from the grounding surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A Planar Inverted-F Antenna (PIFA), comprising:
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a radiation patch having a radiating edge and a non-radiating edge;
a grounding surface;
at least one shorting plate for shorting the radiation patch from the grounding surface;
a feeder for providing radio frequency (RF) power to the radiation patch; and
a stub extended from the non-radiating edge and controlling reactance of the antenna wherein the stub includes;
a stub connector formed of a plurality of metal plates extended from the non-radiating edge toward the grounding surface;
a stub body connected to the stub connector and positioned with a predetermined distance from the grounding surface; and
a slot formed in the stub body. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A Radio Frequency Identification (RFID) tag, comprising:
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a Planar Inverted-F Antenna (PIFA);
a digital processor for generating a digital signal on information for the RFID tag; and
an RF transceiver for modulating the digital signal into an RF signal and transmitting the RF signal through the PIFA, wherein the PIFA includes;
a radiation patch having a radiating edge and a non-radiating edge;
a grounding surface;
at least one shorting plate for shorting the radiation patch from the grounding surface;
a feeder for providing RF power to the radiation patch; and
a meander line extended from the radiating edge toward the grounding surface and positioned with a predetermined distance from the grounding surface.
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24. A Radio Frequency Identification (RFID) tag, comprising:
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a Planar Inverted-F Antenna (PIFA);
a digital processor for generating a digital signal on information for the RFID tag; and
an RF transceiver for modulating the digital signal into an RF signal and transmitting the RF signal through the PIFA, wherein the PIFA includes;
a radiation patch having a radiating edge and a non-radiating edge;
a grounding surface;
at least one shorting plate for shorting the radiation patch from the grounding surface;
a feeder for providing RF power to the radiation patch;
a stub connector formed of a plurality of metal plates extended from the non-radiating edge toward the grounding surface;
a stub body connected to the stub connector and positioned with a predetermined distance from the grounding surface; and
a slot formed in the stub body.
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25. A method for adjusting impedance of a Planar Inverted-F Antenna (PIFA), comprising the step of:
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a) adjusting capacitive reactance of the PIFA according to a distance between a lower part of a meander line and a grounding surface, wherein the PIFA includes;
a radiation patch having a radiating edge and a non-radiating edge;
the grounding surface;
at least one shorting plate for shorting the radiation patch from the grounding surface;
a feeder for providing radio frequency (RF) power to the radiation patch;
the meander line extended from the radiating edge toward the grounding surface and positioned with a predetermined distance from the grounding surface; and
a stub extended from the non-radiating edge and including;
a stub connector formed of a plurality of metal plates extended from the non-radiating edge toward the grounding surface;
a stub body connected to the stub connector and positioned with a predetermined distance from the grounding surface; and
a slot formed in the stub body. - View Dependent Claims (26, 27, 28)
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Specification