Antenna device and communication terminal apparatus

• US 9,948,005 B2
• Filed: 06/08/2016
• Issued: 04/17/2018
• Est. Priority Date: 09/07/2010
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Miura, Teppei, Sasaki, Jun, Kubo, Hiroyuki, Taniguchi, Katsumi, Kato, Noboru, Ozawa, Masahiro, Ishino, Satoshi
• Primary Examiner(s): Levi, Dameon E
• Assistant Examiner(s): LOTTER, DAVID E
• Application Number:
  US15/176,488
• Publication Number:
  US 20160285155A1
• Time in Patent Office: 678 Days
• Field of Search: 343788
• CPC Class Codes: G06K 7/10316 using at least one antenna particularly designed for interrogating the wireless record carriers antennas in general H01Q1/22
• CPC Class Codes: G06K 7/10336 the antenna being of the near field type, inductive coil
• CPC Class Codes: H01Q 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 1/2216 used in interrogator/reader equipment
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: H01Q 1/243 with built-in antennas
• 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 21/293 one unit or more being an array of identical aerial elements adaptive arrays H01Q3/2605
• CPC Class Codes: H01Q 25/00 Antennas or antenna systems providing at least two radiating patterns arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence
• CPC Class Codes: H01Q 7/08 Ferrite rod or like elongated core

Abstract

An antenna device that includes a planar conductor with a first side and a second side. The antenna device includes multiple coil antennas that each includes a coil conductor wound around a winding axis that extends in a direction of the planar conductor. Moreover, two or more of the coil antennas have respective coil openings positioned adjacent to the first side of the planar conductor.

Claims

1. An antenna device comprising:

a planar conductor that includes first and second ends that each have an edge extending parallel to one another; and

a plurality of coil antennas each including a coil conductor wound around a winding axis that extends in a direction of the planar conductor, wherein at least two of the plurality of coil antennas have respective coil openings disposed adjacent to the first end portion of the planar conductor, such that a winding axis of each of the at least two coil antennas are transverse to the edge of the first end of the planar conductor with the respective coil the openings of the at least two coil antennas disposed adjacent to the edge of the first end, and wherein at least one of the plurality of coil antennas, other than the at least two coil antennas with coil openings disposed adjacent to the edge of the first end, has a coil opening disposed adjacent to the edge of the second end of the planar conductor.

2. The antenna device according to claim 1, wherein the at least two of the plurality of coil antennas adjacent to the edge of the first end and the at least one of the plurality of coil antenna adjacent to the edge of the second end are different in number.

3. The antenna device according to claim 1, wherein the respective edges of the first end of the planar conductor and the second end of the planar conductor are opposed to each other.

4. The antenna device according to claim 1, wherein the coil conductors of at least two of the plurality coil antennas are connected in series to a feed circuit.

5. The antenna device according to claim 1, wherein the coil conductors of at least two of the plurality of coil antennas are connected in parallel to a feed circuit.

6. The antenna device according to claim 1, wherein the coil conductor is formed in a multilayer body having a plurality of laminated base material layers.

7. The antenna device according to claim 6, wherein each of the plurality of coil antennas includes a magnetic body disposed at least inside a winding region of the coil conductor.

8. The antenna device according to claim 7, wherein each of the plurality of coil antennas includes a coupling electrode disposed inside the multilayer body or at a bottom surface of the multilayer body, and each coupling electrode is electrically conducted to the planar conductor and is coupled to the coil conductor through a magnetic field.

9. The antenna device according to claim 8, wherein each coupling electrode is a strip electrode extending in a direction perpendicular to the winding axis.

10. The antenna device according to claim 6, wherein the planar conductor is formed integrally with the multilayer body.

11. The antenna device according to claim 9, wherein the planar conductor is formed integrally with the multilayer body.

12. The antenna device according to claim 1, wherein the winding axis of the coil conductor of each of the plurality of coil antennas extends in a direction parallel to a surface of the planar conductor.

13. The antenna device according to claim 1, wherein the at least two of the plurality of coil antennas each have opposing first and second coils openings with the respective first coil openings being the coils openings disposed adjacent to the edge of the first end of the planar conductor and the first coil openings facing the first end of the planar conductor.

14. The antenna device according to claim 1, wherein the at least two of the plurality of coil antennas are disposed on the planar conductor, such that the at least two coil antennas are both aligned in a direction parallel to the first end of the planar conductor.

15. The antenna device according to claim 14, wherein the at least two of the plurality of coil antennas are each spaced a same distance from the first end of the planar conductor.

16. The antenna device according to claim 14, wherein the coil conductor of each of the at least two of the plurality of coil antennas are both aligned and extend in the direction parallel to the first end of the planar conductor.

17. The antenna device according to claim 1, wherein the plurality of coil antennas are disposed on the planar conductor asymmetrically with respect to a center of the planar conductor.

18. The antenna device according to claim 1, wherein the at least two of the plurality of coil antennas are disposed on the first end of the planar conductor.