Antenna device and communication apparatus

• US 7,777,677 B2
• Filed: 12/24/2004
• Issued: 08/17/2010
• Est. Priority Date: 12/25/2003
• Status: Active Grant

• Current Assignee: Mitsubishi Materials Corporation
• Original Assignee: Mitsubishi Materials Corporation
• Inventors: Yukimoto, Shinsuke, Yokoshima, Takao, Edamatsu, Toshiaki, Bungo, Akihiro
• Primary Examiner(s): DINH, TRINH VO
• Application Number:
  US10/596,812
• Publication Number:
  US 20070285335A1
• Time in Patent Office: 2,062 Days
• Field of Search: None
• 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 5/321 within a radiating element or between connected radiating elements
• CPC Class Codes: H01Q 5/328 between a radiating element and ground
• CPC Class Codes: H01Q 5/335 at the feed, e.g. for impedance matching
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

There is provided an antenna device including a substrate, an earth section which is disposed on a portion of the substrate, a feed point which is disposed on the substrate, a loading section disposed on the substrate and constructed with a line-shaped conductor pattern which is formed in a longitudinal direction of an elementary body made of a dielectric material, an inductor section which connects one end of the conductor pattern to the earth section, and a feed point which feeds a current to a connection point of the one end of the conductor pattern and the inductor section, wherein a longitudinal direction of the loading section is arranged to be parallel to an edge side of the earth section.

Claims

1. An antenna device comprising:

a substrate;

a conductor film which is disposed on a portion of the substrate;

a loading section disposed on the substrate and constructed with a line-shaped conductor pattern which is formed in a longitudinal direction on a body made of a dielectric material;

an inductor section for adjusting the antenna operating frequency, which connects one end of the conductor pattern to the conducive film; and

a feed point disposed on the substrate, which feeds a current to a connection point of the one end of the conductor pattern to the conductor film,

wherein a longitudinal direction of the loading section is arranged to be parallel to an edge side of the conductor film,

a self resonance frequency of the loading section is higher than the antenna operating frequency, and

the other end of the line-shaped conductor pattern is formed as an open end.

2. The antenna device according to claim 1, wherein a capacitor section is connected between the connection point and the feed section.

3. The antenna device according to claim 1, wherein the loading section includes a lumped element circuit.

4. The antenna device according to claim 1, wherein the capacitor section includes a capacitor section which is constructed with a pair of planar electrodes formed on the body to face each other.

5. The antenna device according to claim 4, wherein one of a pair of the planar electrodes is disposed on a surface of the elementary body and can be trimmed.

6. The antenna device according to claim 1, wherein a multiple-resonance capacitor section is equivalently serially connected between two different points of the conductor pattern.

7. The antenna device according to claim 1, wherein the conductor pattern is wound around the body in a longitudinal direction thereof in a helical shape.

8. The antenna device according to claim 1, wherein the conductor pattern is formed on a surface of the body in a meander shape.