Multiband antenna device and communication terminal device

• US 8,035,563 B2
• Filed: 09/22/2006
• Issued: 10/11/2011
• Est. Priority Date: 10/25/2005
• Status: Expired due to Fees

• 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
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US12/089,922
• Publication Number:
  US 20090231213A1
• Time in Patent Office: 1,845 Days
• Field of Search: 343/700.MS, 343/702, 343/846
• US Class Current: 343/700.0MS
• 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. An inverted f-type multi-band antenna device 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 the antenna radiating plate projects through the outside of the ground plate with respect to the feed point and the GND point so that at least a major part of the antenna radiating plate does not face the ground plate, and

at least three resonance points that support communications in at least three communications bands are generated in correspondence with the at least three antenna elements.

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. A communication terminal apparatus characterized by comprising an inverted f-type 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 the antenna radiating plate projects through the outside of the ground plate with respect to the feed point and the GND point so that at least a major part of the antenna radiating plate does not face the ground plate, and

at least three resonance points that support communications in at least three communications bands are generated in correspondence with the at least three antenna elements.

4. An inverted f-type multi-band antenna comprising:

a ground plate; and

an antenna radiating plate having a feed point and a ground point, the antenna radiating plate projecting through the outside of the ground plate with respect to the feed point and the ground point so that a major part of the antenna radiating plate does not face the ground plate, wherein the antenna radiating plate includes at least three antenna elements, and

the feed point and the ground point of the antenna radiating plate being are electrically distant from one another, wherein at least three resonance points that support communications in at least three communications bands are generated in correspondence with the at least three antenna elements.