Small profile antenna and RFID device having same

• US 8,217,849 B2
• Filed: 04/07/2008
• Issued: 07/10/2012
• Est. Priority Date: 04/07/2008
• Status: Active Grant

• Current Assignee: Zest Labs, Inc.
• Original Assignee: Intelleflex Corporation
• Inventors: Sardariani, Edmond, Ramisetti, Sireesha
• Primary Examiner(s): LE, HOANGANH T
• Application Number:
  US12/098,960
• Publication Number:
  US 20100007570A1
• Time in Patent Office: 1,555 Days
• Field of Search: 343/700.MS, 343/895, 343/793, 343/795
• US Class Current: 343/793
• 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 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
• CPC Class Codes: Y10T 29/49018 with other electrical component

Abstract

An antenna system for a Radio Frequency Identification (RFID) tag in one embodiment includes a base portion; at least one angled portion oriented to have a tangential angle of between about 1 degree and about 179 degrees from a plane of the base portion; and an antenna trace on the at least one angled portion. An antenna system for an RFID tag in another embodiment includes a base portion; at least one angled portion having at least two sections each oriented to have a tangential angle of between about 1 degree and about 179 degrees from a plane of the base portion, the two sections having different overall angles relative to the base portion; and an antenna trace on the at least one angled portion. Additional systems and methods are presented.

Claims

1. An antenna system for a Radio Frequency Identification (RFID) tag, the system comprising:

a base portion;

multiple angled portions each oriented to have a tangential angle of between about 5 degrees and about 175 degrees from a plane of the base portion; and

antenna traces extending from the base portion onto each of the angled portions, the antenna traces being usable in RFID communications,

wherein each angled portion has a free end positioned along an edge thereof opposite from the base portion,

wherein each antenna trace on the angled portion associated therewith has a serpentine shape with several bends along its length,

wherein each antenna trace on the associated angled portion has several first sections that extend parallel to a bend located at an interface of the angled portion and the base portion;

wherein each antenna trace on the associated angled portion has several second sections that extend between the first sections;

wherein at least one of the antenna traces on the base portion has a serpentine shape with several bends along its length, and

further comprising a housing having a peripheral sidewall defining an interior therein, base portion and angled portions being inserted in the interior, the sidewall holding the angled portions at the orientation relative to the plane of the base portion, the housing preventing movement of the at least one of the angled portions from the orientation.

2. The system of claim 1, wherein at least two angled portions are present, an antenna trace being present on each of the angled portions, wherein the antenna traces are configured for backscatter RFID communications.

3. The system of claim 1, wherein the antenna trace is part of a dipole antenna, wherein an antenna trace is present on each of the angled portions, each of the antenna traces having a free terminal end thereof on the associated angled portion.

4. The system of claim 1, wherein the antenna trace is part of a dual dipole antenna, wherein at least four angled portions are present, an antenna trace being present on each of the angled portions.

5. The system of claim 1, wherein each of the angled portions is oriented at an overall angle of between about 75 degrees and about 105 degrees from the plane of the base portion.

6. The system of claim 1, wherein a profile of a substrate having the base portion and the angled portions has a maximum width of less than about 3 inches.

7. The system of claim 1, wherein a profile of a substrate having the base portion and the angled portions has a maximum width of less than about 2 inches.

8. The system of claim 1, wherein a profile of a substrate having the base portion and the angled portions has a maximum width of less than about 1 inch.

9. The system of claim 1, wherein the antenna traces are part of a dipole antenna, wherein a portion of each antenna trace capable of actively backscattering or transmitting and receiving is also present on the base portion.

10. The system of claim 1, wherein each of the angled portions has a generally planar configuration, wherein a plane of each of the angled portions is oriented at the angle of between about 5 degrees and about 175 degrees from the plane of the base portion, wherein the sections of the antenna trace in each of the angled portions lie in the plane of the associated angled portion, wherein the antenna traces are configured for backscatter RFID communications.

11. The system of claim 1, wherein at least one of the angled portions has at least one bend at a location thereon that is away from a junction of the at least one of the angled portions and the base portion, the antenna trace extending across the bend.

12. A Radio Frequency Identification (RFID) system, the system comprising:

an RFID chip configured for backscatter communication;

a base portion;

four angled portions each oriented to have a tangential angle of between about 1 degree and about 179 degrees from a plane of the base portion; and

a dual dipole antenna having traces on each of the angled portions, the traces being in electrical communication with the RFID chip,

wherein each angled portion has a free end positioned along an edge thereof opposite from the base portion,

wherein each antenna trace on the angled portion associated therewith has a serpentine shape with several bends along its length,

wherein each antenna trace on the associated angled portion has several first sections that extend parallel to a bend located at an interface of the angled portion and the base portion;

wherein each antenna trace on the associated angled portion has several second sections that extend between the first sections;

wherein at least one of the antenna traces on the base portion has a serpentine shape with several bends along its length; and

further comprising a housing having a peripheral sidewall defining an interior therein, base portion and angled portions being inserted in the interior the sidewall holding the angled portions at the orientation relative to the plane of the base portion, the housing preventing movement of the angled portions from the orientation.

13. The system of claim 12, further comprising an interface for connection to a battery.

14. The system of claim 12, wherein the angled portions are each oriented at an angle of between about 75 degrees and about 105 degrees from the plane of the base portion.

15. The system of claim 13, wherein a profile of a substrate having the base portion and each of the angled portions has a maximum width of less than about 3 inches.

16. The system of claim 12, wherein a profile of a substrate having the base portion and the angled portions has a maximum width of less than about 2 inches.

17. The system of claim 12, wherein a profile of a substrate having the base portion and the angled portions has a maximum width of less than about 1 inch.

18. The system of claim 12, wherein portions of the antenna capable of actively backscattering are also present on the base portion.

19. The system of claim 12, wherein each of the angled portions has a planar configuration.

20. The system of claim 12, wherein at least one of the angled portions has at least one bend at a location thereon that is away from a junction of the at least one of the angled portions and the base portion, the antenna trace extending across the bend.

21. A Radio Frequency Identification (RFID) system, comprising:

an RFID chip configured for backscatter communication;

a base portion;

four angled portions each oriented to have a tangential angle of between about 1 degree and about 179 degrees from a plane of the base portion; and

a dual dipole antenna having traces on each of the angled portions, the traces being in electrical communication with the RFID chip,

wherein each angled portion has a free end positioned along an edge thereof opposite from the base portion,

wherein each antenna trace on the angled portion associated therewith has a serpentine shape with several bends along its length,

wherein each antenna trace on the associated angled portion has several first sections that extend parallel to a bend located at an interface of the angled portion and the base portion;

wherein each antenna trace on the associated angled portion has several second sections that extend between the first sections;

wherein at least one of the antenna traces on the base portion has a serpentine shape with several bends along its length; and

further comprising a housing having a generally cylindrical portion that has a central axis oriented in an interior of the housing and about perpendicular to the base portion, wherein the angled portions are positioned in the interior of the housing wherein outer sides of the angled portions generally conform to and extend along a rounded shape of the generally cylindrical portion.

22. A method of fabricating a Radio Frequency Identification (RFID) system, the method comprising:

inserting a substrate and antenna in an interior of a housing, the substrate having a base portion and multiple angled portions, the antenna being positioned, at least in part, on the angled portions,

wherein insertion of the substrate and antenna in the interior of the housing causes the angled portions to each become oriented to have a tangential angle of between about 5 degrees and about 175 degrees from a plane of the base portion,

wherein each angled portion has a free end positioned along an edge thereof opposite from the base portion,

wherein each antenna trace on the angled portion associated therewith has a serpentine shape with several bends along its length,

wherein each antenna trace on the associated angled portion has several first sections that extend parallel to a bend located at an interface of the angled portion and the base portion;

wherein each antenna trace on the associated angled portion has several second sections that extend between the first sections;

wherein at least one of the antenna traces on the base portion has a serpentine shape with several bends along its length.

23. The method of claim 22, further comprising coupling an RFID chip configured for backscatter communication to traces extending along the angled portions, wherein a plane of each of the angled portions is oriented at an angle of between about 5 degrees and about 175 degrees from the plane of the base portion when inserted in the housing, wherein the sections of the antenna trace in each of the angled portions lie in the plane of the associated angled portion.

24. An antenna system for a Radio Frequency Identification (RFID) tag, the system comprising:

a base portion;

at least one angled portion having at least two sections each oriented to have a tangential angle of between about 1 degree and about 179 degrees from a plane of the base portion, the two sections having different overall angles relative to the base portion;

an antenna trace on the at least one angled portion, the trace extending along both sections of the at least one angled portion; and

a housing having a peripheral sidewall defining an interior therein, the base portion and angled portions being inserted in the interior, the sidewall holding the angled portions at the orientation relative to the plane of the base portion.

25. The system of claim 24, wherein each angled portion has a free end positioned along an edge thereof opposite from the base portion, wherein each antenna trace on the angled portion associated therewith has a serpentine shape with several bends along its length, wherein each antenna trace on the associated angled portion has several first sections that extend parallel to a bend located at an interface of the angled portion and the base portion;

wherein each antenna trace on the associated angled portion has several second sections that extend between the first sections;

wherein at least one of the antenna traces on the base portion has a serpentine shape with several bends along its length.