Antenna device

• US 6,356,244 B1
• Filed: 03/20/2000
• Issued: 03/12/2002
• Est. Priority Date: 03/30/1999
• Status: Expired due to Term

• Current Assignee: Hiroyuki Arai, NGK Insulators Limited
• Original Assignee: Hiroyuki Arai, NGK Insulators Limited
• Inventors: Arai, Hiroyuki, Mizutani, Yasuhiko, Hirai, Takami, Mizuno, Kazuyuki
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): TRAN, CHUC
• Application Number:
  US09/531,289
• Time in Patent Office: 722 Days
• Field of Search: 343/895, 343/700.MS, 343/702, 343/725, 343/846, 343/701, 343/850, 343/860, 343/806, 343/849
• US Class Current: 343/895
• 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 11/14 with parts bent, folded, shaped or screened or with phasing impedances, to obtain desired phase relation of radiation from selected sections of the antenna or to obtain desired polarisation effect H01Q11/20 takes precedence
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 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

An antenna device comprises an antenna section and a filter section which are formed in an integrated manner in a dielectric substrate, wherein the antenna section and the filter section are coupled to one another via a capacitance. Further, 0.3×Lr≦Lt≦1.2×Lr is satisfied provided that an antenna length of the antenna section is Lt, and an antenna length measured for a single antenna is Lr. Accordingly, it is possible to realize a small size of the antenna device while avoiding the decrease in gain and the disadvantage of narrow band.

Claims

1. An antenna device comprising:

an antenna section;

a filter section, said antenna section and said filter section being formed integrally in a dielectric substrate formed from a plurality of stacked dielectric layers; and

a capacitance, comprising at least one of said dielectric layers, disposed between said antenna section and said filter section;

wherein said antenna section and said filter section are coupled to one another via said capacitance.

2. The antenna device according to claim 1, wherein 0.3×

Lr≦

Lt≦

1.2×

Lr is satisfied provided that an antenna length of said antenna section is Lt, and an antenna length measured for a single antenna is Lr.

3. The antenna device according to claim 2, wherein said antenna length Lt of said antenna section satisfies 0.6×

Lr≦

Lt≦

1.2×

Lr.

4. The antenna device according to claim 3, wherein said antenna length Lt of said antenna section satisfies 0.75×

Lr≦

Lt≦

Lr.

5. The antenna device according to claim 1, wherein an antenna for constructing said antenna section is a monopole antenna.

6. The antenna device according to claim 1, wherein an antenna for constructing said antenna section is an antenna having a meander line configuration.

7. The antenna device according to claim 1, wherein an antenna for constructing said antenna section is an antenna having a helical configuration.

8. The antenna device according to claim 1, wherein a length of a resonator disposed on an input side of said filter section is different from a length of a resonator disposed on an output side.

9. An antenna device according to claim 1, further comprising at least one ground electrode formed on a side surface of said filter section.

10. An antenna device comprising an antenna section and a filter section which are formed integrally in a dielectric substrate, wherein:

said antenna section and said filter section are coupled to one another via a capacitance; and

wherein a length of a resonator disposed on an input side of said filter section is different from a length of a resonator disposed on an output side.