Antenna device and communication terminal apparatus

Patent metadata

Field	Value
Publication number	US-2016285155-A1
Application number	US-201615176488-A
Country	US
Kind code	A1
Filing date	Jun 8, 2016
Priority date	Sep 7, 2010
Publication date	Sep 29, 2016
Grant date	—

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.

First claim

1 . An antenna device comprising:
a planar conductor that includes a first side and a second side; 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 side of the planar conductor.

2 . The antenna device according to claim 1 , wherein at least one of the plurality of coil antennas, other than the coil antennas with coil openings disposed adjacent to the first side, has a coil opening disposed adjacent to the second side of the planar conductor.

3 . The antenna device according to claim 1 , wherein the plurality of coil antennas include at least two first coil antennas having respective coil openings disposed adjacent to the first side of the planar conductor, and at least one second coil antenna having a coil opening disposed adjacent to the second side of the planar conductor.

4 . The antenna device according to claim 3 , wherein the at least two first coil antennas and the at least one second coil antenna are different in number.

5 . The antenna device according to claim 1 , wherein the first side of the planar conductor and the second side of the planar conductor are opposed to each other.

6 . 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.

7 . 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.

8 . 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.

9 . The antenna device according to claim 8 , wherein each of the plurality of coil antennas includes a magnetic body disposed at least inside a winding region of the coil conductor.

10 . The antenna device according to claim 9 , 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.

11 . The antenna device according to claim 10 , wherein each coupling electrode is a strip electrode extending in a direction perpendicular to the winding axis.

12 . The antenna device according to claim 8 , wherein the planar conductor is formed integrally with the multilayer body.

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

Assignees

• Murata Manufacturing Co

Inventors

• Miura Teppei
• Sasaki Jun
• Kubo Hiroyuki
• Taniguchi Katsumi
• Kato Noboru
• Ozawa Masahiro
• Ishino Satoshi

Classifications

• H01Q7/08 Primary

  Ferrite rod or like elongated core · CPC title

• H01Q1/243 Primary

  with built-in antennas · CPC title

• H01Q1/2208

  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 title

• H01Q1/242

  specially adapted for hand-held use · CPC title

• H01Q25/00

  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 title