Antenna device and communication terminal apparatus

• US 9,865,924 B2
• Filed: 06/08/2016
• Issued: 01/09/2018
• 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:
  US15/176,456
• Publication Number:
  US 20160285154A1
• Time in Patent Office: 580 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 coil antenna with a coil conductor wound around a winding axis. The device further includes a planar conductor with a surface and an edge end portion, where the surface extends in the direction of the winding axis and the edge end portion is adjacent to a coil opening of the coil conductor. A booster antenna is also provided and includes a looped or spiral coil conductor and is coupled to the planar conductor and/or the coil antenna.

Claims

1. An antenna device comprising:

a coil antenna that includes a coil conductor wound around a winding axis;

a planar conductor that includes a surface and an edge end portion, the surface extending in a direction of the winding axis; and

a booster antenna that includes a looped or spiral coil conductor, the booster antenna being electromagnetically coupled to both the planar conductor and the coil antenna, the structure of the coil antenna being galvanically independent from the structure of the booster antenna.

2. The antenna device according to claim 1, wherein the planar conductor forms part of another structure external to the antenna device.

3. The antenna device according to claim 1, wherein the planar conductor is a ground electrode in a wiring board.

4. The antenna device according to claim 1, wherein the planar conductor is an outer casing metal of a battery pack.

5. The antenna device according to claim 1, wherein the winding axis of the coil antenna and a winding axis of the booster antenna are orthogonal to each other.

6. The antenna device according to claim 1, wherein the coil conductor of the coil antenna and the coil conductor of the booster antenna overlap each other when viewed from a plan view of the booster antenna.

7. The antenna device according to claim 1, wherein the planar conductor and the booster antenna overlap each other when viewed from a plan view of the booster antenna.

8. The antenna device according to claim 1, wherein a coil opening of the booster antenna is disposed outside an end portion of the planar conductor when viewed from a plan view of the booster antenna.

9. The antenna device according to claim 1, wherein the planar conductor has a center and an edge, a coil opening of the coil conductor is nearer to the edge of the planar conductor than to the center of the planar conductor.

10. An antenna device according to claim 1, wherein the antenna device is designed to communicate over a carrier frequency, the booster antenna having capacitive and inductive components which cooperate to form a resonant circuit having a resonant frequency corresponding to the carrier frequency.