Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2005-12-07
2008-08-19
Dinh, Trinh Vo (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S895000, C343S846000, C343S702000
Reexamination Certificate
active
07414583
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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“Analysis of Radiation Characteristics of Planar Inverted-F Type Antenna On Conductive Body of Hand-Held Transceiver By Spatial Network Method”, Electronics Letters, Aug. 3, 1989, vol. 25, No. 16, pp. 1044-1045.
Chae Jong-Suk
Choi Won-Kyu
Pyo Cheol-Sig
Seong Nak-Seon
Blakely , Sokoloff, Taylor & Zafman LLP
Dinh Trinh Vo
Electronics and Telecommunications Research Institute
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