Rfid Transponder and its Blank and Method of Construction for Manufacturing the Rfid Transponder

• US 20090051617A1
• Filed: 04/24/2007
• Published: 02/26/2009
• Est. Priority Date: 04/28/2006
• Status: Abandoned Application

• Current Assignee: Wisteq Oy
• Original Assignee: Wisteq Oy
• Inventors: Merilainen, Olavi, Seppa, Heikki
• Application Number:
  US12/226,229
• Publication Number:
  US 20090051617A1
• Time in Patent Office: Days
• US Class Current: 343/872
• CPC Class Codes: G06K 19/041 Constructional details G06K19/06 takes precedence
• CPC Class Codes: G06K 19/07771 the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
• CPC Class Codes: G06K 19/07786 the antenna being of the HF type, such as a dipole
• CPC Class Codes: G06K 19/0779 the antenna being foldable or folded
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 1/42 Housings not intimately mechanically associated with radiating elements, e.g. radome
• CPC Class Codes: H01Q 23/00 Antennas with active circuits or circuit elements integrated within them or attached to them
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence

Abstract

The invention relates to an RFID transponder, which includes a case, a radiator, and a ground element, as opposed antenna elements, a ground plane intended to be set against the base at a distance from the radiator, and an electrical chip component. The radiator, ground element, and chip component are installed on a special foil, which also comprises the said ground plane on the first plane (A) and a fold between the first and second plane, the foil being thus divided into a first part on the first plane (A), the fold, and a second part on the second plane (B). The case has attached to it intermediate structure for supporting the first part and the second part of the foil on the said first plane (A) and second plane (B).

Claims

1. RFID transponder, which includes a case, a radiator, and a ground element, as opposed antenna elements, a ground plane intended to be set against the base at a distance from the radiator, and an electrical chip component, and in which the ground plane is on the first plane (A), and the radiator is on the second plane (B), at a distance from the first plane, and in which the chip component is connected to the radiator and the ground element, and, further, in which the said radiator, ground element, and chip component are installed on a special foil, characterized in that the said foil also comprises the said ground plane on the first plane (A) and a fold between the first and second plane, the foil being thus divided into a first part on the first plane (A), the fold, and a second part on the second plane (B), and intermediate structure relating to the case for supporting the first part and the second part of the foil on the said first plane (A) and second plane (B).

2. RFID transponder according to claim 1, characterized in that the ground plane is connected to form the ground element by a transmission line running through the fold.

3. RFID transponder according to claim 1, characterized in that the foil is attached to the inner surface of the case, the said intermediate structure thus being formed by the actual case.

4. RFID transponder according to claim 1, characterized in that the foil is supported on the internal intermediate structure carried by the case, which determines mechanically the distance of the first and second levels from each other, the said intermediate structure thus being formed mainly of the intermediate structure.

5. RFID transponder according to claim 1, characterized in that the intermediate structure is a frame creating mainly air insulation between the first and second planes.

6. RFID transponder according to claim 1, characterized in that the intermediate structure is board, which has a chosen dielectric value ε

.

7. RFID transponder according to claim 4, characterized in that the intermediate structure is arranged to be pushed in through an opening in the wall of the case and the intermediate structure includes a wall covering the opening.

8. RFID transponder according to claim 1, characterized in that the length of the electrical components in the direction of the fold is 4/√

ε

-15/√

ε

, in which ε

is the dielectric value of the substance between the first and second planes.

11. Method of construction for manufacturing an RFID transponder according to claim 1, in which the transponder is assembled from prefabricated components, which include a case and a foil containing the electrical components, and in which the foil is support on the case in a U shape, one branch containing a ground plane intended against the base, characterized in that an intermediate piece is formed, around which the foil is folded into the said U shape, after which the intermediate piece with the foil is pushed into the case and the intermediate piece is attached to the case.

12. Method of construction for manufacturing an RFID transponder according to claim 1, in which the transponder is assembled from prefabricated components, which include a case and a foil containing the electrical components, and in which the foil is supported on the case in a U shape, one branch containing a ground plane intended against the base, characterized in that the case blank is manufactured by injection-moulding as an essentially planar object and the foil is located as an inlay component in the mould before moulding and the finished blank with the foil is folded in two and finally the joints are closed, in order to create a closed case.

9. Blank for an RFID transponder, which includes a case-component blank, a foil comprising a ground plane, a ground element, a radiator, and a two-terminal chip component connected to the radiator and the ground element, and in which the said ground plane, ground element, radiator, and chip component are installed on the foil, characterized in that the case-component blank comprises a planar area and side elements at its edges and the foil is installed in a planar form on this area, which case-component blank is, together with the foil, arranged to be folded in two, to form a closed case, in which case the parts of the foil located on each side of the fold take up a position at a distance from each other.

10. Blank according to claim 9 for an RFID transponder, characterized in that the blank of the case component is an injection-moulded piece.