Meander line antenna

• US 20060170606A1
• Filed: 06/21/2005
• Published: 08/03/2006
• Est. Priority Date: 02/01/2005
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kai, Manabu, Maniwa, Toru, Yamagajo, Takashi
• Granted Patent: US 7,205,954 B2
• Time in Patent Office: Days
• US Class Current: 343/803
• CPC Class Codes: G06K 19/0726 the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 9/26 with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength resonant loop antennas H01Q7/00
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

A meander line antenna formed in the shape of meander is disclosed. The meander line antenna includes a bottom half section that is constituted by a folded conductive pattern of a folded dipole antenna, and includes a feeding point for mounting an IC chip at the central part; a top half section that is constituted by a folded conductive pattern of a folded dipole antenna shaped like the bottom half section; and a frequency adjusting section consisting of connecting conductive patterns arranged at an interval corresponding to a desired frequency centering on the feeding point, the connecting conductive patterns connecting the bottom half section and the top half section. The connecting conductive patterns can be cut off, and the folded conductive pattern outside of the cut-off connecting conductive patterns can be removed.

Claims

1. A meander line antenna formed by folding a conductive pattern of a folded dipole antenna in the shape of a meander, having a basic structure comprising:

a bottom half section that includes a folded conductive pattern, and a feeding point arranged at approximately the central part of the bottom half section;

a top half section that includes a folded conductive pattern shaped like the folded conductive pattern of the bottom half section; and

a frequency adjusting section constituted by connecting conductive patterns that connect the bottom half section and the top half section at intervals corresponding to desired resonance frequencies, the intervals centering on the feeding point.

2. The meander line antenna as claimed in claim 1, wherein connecting conductive patterns of the frequency adjusting section corresponding to a desired frequency remain intact, connecting conductive patterns inside of the intact connecting conductive patterns are removed, and the folded conductive patterns outside of the intact connecting conductive patterns are removed.

3. The meander line antenna as claimed in claim 1, further comprising:

a fine-tuning section that includes a plurality of short circuit conductive patterns that connect certain countering conductive patterns of the top half section at predetermined intervals, the certain countering conductive patterns being located at a position that counters the feeding point formed in the bottom half section.