Compact and low-profile antenna device having wide range of resonance frequencies

• US 20040155832A1
• Filed: 12/15/2003
• Published: 08/12/2004
• Est. Priority Date: 12/16/2002
• Status: Abandoned Application

• Current Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Yuanzhu, Dou
• Application Number:
  US10/737,488
• Publication Number:
  US 20040155832A1
• Time in Patent Office: Days
• US Class Current: 343/895
• 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 9/36 with top loading
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

An antenna device includes a meandering radiating conductor plate composed of a metal ribbon having a predetermined width that is folded a plurality of times so as to meander, a capacitive conductor plate disposed substantially parallel to a ground conductor and connected to the top end of the meandering radiating conductor plate, a connection conductor plate for electrically shorting the capacitive conductor plate to the ground conductor, and a straight radiating conductor plate extending upwardly in a vertical direction and being connected to the bottom end of the meandering radiating conductor plate. The antenna device operates as a dual-band antenna where the meandering radiating conductor plate resonates by feeding first high-frequency power and the straight radiating conductor plate resonates by feeding second high-frequency power that has a higher frequency than that of the first high-frequency power.

Claims

1. An antenna device comprising:

a meandering radiating conductor plate comprising a metal ribbon folded a plurality of times; and

a supporting substrate having a ground conductor thereon;

wherein the radiating conductor plate is vertically mounted on the supporting substrate and first high-frequency power is fed to the bottom end of the radiating conductor plate.

2. An antenna device according to claim 1, further comprising:

a capacitive conductor plate disposed substantially parallel to the ground conductor and connected to the top end of the radiating conductor plate; and

a connection conductor plate for electrically shorting the capacitive conductor plate to the ground conductor.

3. An antenna device according to claim 2, wherein the top end of the radiating conductor plate is connected to substantially the center of the capacitive conductor plate.

4. An antenna device according to claim 2, wherein the radiating conductor plate comprises a folded metal ribbon that is a cut and bent portion of a flat metal sheet and the capacitive conductor plate comprises the remaining portion of the flat metal sheet.

5. An antenna device according to claim 1, further comprising a second radiating conductor plate extending upwardly in a vertical direction and connected to the bottom end of the radiating conductor plate;

wherein second high-frequency power that has a higher frequency than that of the first high-frequency power is fed to the bottom end of the second radiating conductor plate.