PIFA, RFID tag using the same and antenna impedance adjusting method thereof
US7414583B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2005 |
| Grant date | Aug 19, 2008 |
| Priority date | — |
| Expiry date | Dec 7, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/0442
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.