MULTIBAND ANTENNA DEVICE AND COMMUNICATION TERMINAL DEVICE

• US 20090231213A1
• Filed: 09/22/2006
• Published: 09/17/2009
• Est. Priority Date: 10/25/2005
• Status: Active Grant

• Current Assignee: Sony Ericsson Mobile Communications Japan Incorporated (Sony Group Corp.)
• Original Assignee: Sony Ericsson Mobile Communications Japan Incorporated (Sony Group Corp.)
• Inventors: Ishimiya, Katsunori
• Granted Patent: US 8,035,563 B2
• Time in Patent Office: Days
• US Class Current: 343/702
• 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 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/371 Branching current paths
• 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 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A slit (15) is formed between a feed point and GND point of an inverted-F antenna to make the points electrically distant from each other, and at least three antenna elements (14a, 14b, and 14c) are formed. The at least three antenna elements (14a, 14b, and 14c) generate at least three resonance points. An antenna radiating plate (3) projects outwardly so that at least a major part thereof does not face a ground plate (4). Therefore, a multi-band antenna device capable of achieving a wider bandwidth without using a parasitic element, and a communication terminal apparatus are provided.

Claims

1. A multi-band antenna device characterized by comprising an antenna radiating plate having a feed point and a GND point, and a ground plate, wherein the antenna radiating plate is configured such that the feed point and the GND point are electrically distant from each other, that at least three antenna elements are formed, and that at least a major part of the antenna radiating plate does not face the ground plate.

2. The multi-band antenna device according to claim 1, characterized in that a slit is formed between the feed point and GND point of the antenna radiating plate.

3. The multi-band antenna device according to claim 1, characterized in that at least three resonance points are generated in correspondence with the at least three antenna elements.

4. A communication terminal apparatus characterized by comprising a multi-band antenna device,

the multi-band antenna device including an antenna radiating plate having a feed point and a GND point, and a ground plate, wherein the antenna radiating plate is configured such that the feed point and the GND point are electrically distant from each other, that at least three antenna elements are formed, and that at least a major part of the antenna radiating plate does not face the ground plate.