This application claims the benefit of the filing dates under 35 U.S.C. ยง119(a)-(d) of TW Patent Application No. 100145759, filed on Dec. 12, 2011.
The invention relates to a linear radio frequency identification antenna and, more particularly, to a linear radio frequency identification antenna for use with portable electronic devices and for use in reducing electromagnetic interference (EMI).
Various electronic products, especially portable electronic products, such as mobile phones, notebook computers, tablet computers/panel PC, personal digital assistants (PDA), barcode identification system devices, radio frequency identification (RFID) system devices, and global positioning system (GPS) devices, are commercially available and in wide use. When compared with its identification-related counterparts, radio frequency identification (RFID) has advantages, such as long service life, high security, and all-weather operation. Radio frequency identification (RFID) advantageously features a longer sensing distance and a higher scanning speed than conventional barcode identification systems do (because barcode tags have to be identified one by one, whereas more than 200 radio frequency identification-enabled tags can be processed simultaneously). Hence, it is even predicted that radio frequency identification (RFID) can gain a portion of the market share otherwise occupied by barcode identification. As regards its system framework, a radio frequency identification (RFID) system includes an electronic tag, a reader, and a system application. A radio frequency identification (RFID) antenna is installed on the reader and designed to operate by electromagnetic sensing or by microwave technology. In general, no electric wave can penetrate a metallic barrier. Nonetheless, electric wave can divert and form a magnetic field. Hence, the RFID antenna design is typically subjected to a limitation, that is, a magnetic field has to shun any shielding effect that is likely to preclude the formation of the magnetic field, and in consequence it is necessary for the RFID antenna to be equipped with a shielding layer for blocking electromagnetic interference.
Presently, conventional RFID antennas are formed mostly from conventional coils or printed circuit boards (PCB). The conventional RFID antennas formed from coils or printed circuit boards are bulky. However, a conventional RFID antenna is typically installed on a PCB (and thus known as PCB-style RFID antenna) or on a lid (and thus known as coil-style RFID antenna.) Therefore, the RFID antenna installed on a PCB or a lid has to be covered with a large shielding layer for preventing electromagnetic interference, thereby incurring additional manufacturing costs. Accordingly, it is desired to provide an effective way of cutting the costs of a shielding layer used for preventing electromagnetic interference.
It is an objective of the invention, among others, to provide a linear radio frequency identification antenna for use with portable electronic devices and for use in reducing electromagnetic interference (EMI).
The linear radio frequency identification antenna includes an insulating material, a shielding material, and a conductive wire. The shielding material connects with the insulating material to form a closed body. The conductive wire is covered by the closed body such that the conductive wire, the insulating material, and the shielding material together form a linear-shaped body.
The invention will be explained in greater detail in the following with reference to embodiments, referring to the appended drawings, in which:
The invention will now be described in greater detail with reference to the drawings.
Referring first to
The insulating material 11 and the shielding material 12 together form a closed body for covering the conductive wire 10. The conductive wire 10, the insulating material 11, and the shielding material 12 together form a linear-shaped body by a jacket extruder.
As shown in
Once the jacket extruder starts, the jacket extruder will compress the insulating material 11, the conductive wire 10, and the shielding material 12 and to cause the insulating material 11 and the shielding material 12 to be joined with each other. The joined insulating material 11 and the shielding material 12 enclose and cover the conductive wire 10, thereby forming the linear-shaped body, as shown in
In this embodiment, the shielding material 12 is produced by mixing iron powder and glue to a determined proportion, as needed, such that in a jacket extrusion process the shielding material 12 and the insulating material 11 can be coupled together and fixed in place. As a result, the insulating material 11 and the shielding material 12 are joined to each other so as to enclose and cover the conductive wire 10.
Referring to
Now with reference to
In another process, for manufacturing the linear radio frequency identification antenna 100 according to the invention, the reinforcing material 13 is disposed beside the one conductive wire 10, wherein the step of compressing the conductive wire 10, the insulating material 11, and the shielding material 12 is accompanied by the step of compressing the reinforcing material 13, such that the insulating material 11 and the shielding material 12 are joined to each other so as to enclose and cover the conductive wire 10 and the reinforcing material 13, in order to enhance the rigidity of the linear-shaped body. The reinforcing material 13 is a plastic.
The linear radio frequency identification antenna 100 of the invention is for use with various mobile devices capable of near field communication (NFC), and is for use in reducing electromagnetic interference (EMI) effectively, so as to enhance the performance of identification equipment. The linear radio frequency identification antenna 100 of the invention is characterized by a linear-shaped surface having a shielding material thereon for reducing electromagnetic interference (EMI) and enhancing the performance of identification equipment.
Although the invention is fully illustrated with preferred embodiments and accompanying drawings, it is understandable that persons skilled in the art can modify the invention described herein and still achieve the benefits of the invention. Accordingly, the description below is intended to disclose the invention generally and broadly without limiting the invention.
Number | Date | Country | Kind |
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100145759 A | Dec 2011 | TW | national |
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European Patent Office Search Report, dated Apr. 3, 2013, 6 pages. |
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