Open-ended two-strip meander line antenna, RFID tag using the antenna, and antenna impedance matching method thereof
AssigneeElectronics and Telecommunications Research Institute
InventorsHae-Won Son, Won-Kyu Choi, Gil-Young Choi, Cheol-Sig Pyo
Life of this patent
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Abstract
An open-ended two-strip meander line antenna, an RFID tag using the same and an antenna impedance matching method thereof are provided. The antenna includes: a radiating strip line for deciding a resonant frequency of the antenna; and a feeding strip line for providing a radio frequency (RF) signal to an element connected to the antenna, wherein ends of the radiating strip line and the feeding strip line are open.
Claims53
An antenna comprising:
- a substrate;
- a radiating strip line for deciding a resonant frequency of the antenna disposed on a first surface of the substrate;
- and
- a feeding strip line for providing a radio frequency (RF) signal to an element connected to the antenna disposed on a second surface of the substrate opposite the first surface, wherein the feeding strip line comprises a first end portion and a second end portion separated from the first end portion so as to define a terminal between the first end portion and the second end portion of the feeding strip line,
- wherein ends of the radiating strip line and the feeding strip line are open.
A radio frequency identification (RFID) tag, comprising:
- an antenna for receiving an RF signal transmitted from an RFID reader;
- a RF front-end for rectifying and detecting the RF signal;
- and
- a signal processing unit connected to the RF front-end, wherein the antenna includes:
- a radiating strip line for deciding a resonant frequency of the antenna;
- and
- a feeding strip line for providing a radio frequency (RF) signal to an element connected to the antenna, the feeding strip line comprising a first end portion and a second end portion separated from the first end portion so as to define a terminal between the first end portion and the second end portion of the feeding strip line, and
- wherein ends of the radiating strip line and the feeding strip line are open.
An antenna impedance matching method for an open-ended strip line antenna, the antenna impedance matching method comprising the step of:
- matching an impedance based on a characteristic that an impedance of the radiating strip line is shown at the terminal of the feeding strip line by being transformed to a predetermined impedance step-up ratio through an electromagnetic coupling of the radiating strip line and the feeding strip line,
- wherein the open-ended strip line antenna includes having a radiating strip line for deciding a resonant frequency of the antenna, and a feeding strip line for providing an RF signal to an element connected through a terminal, where the feeding strip line and the radiating strip line are disposed at both sides of a substrate and are electromagnetically coupled with each other.
Dependencies are inferred from the claim text.