Planar antenna

• US 5,973,644 A
• Filed: 07/11/1997
• Issued: 10/26/1999
• Est. Priority Date: 07/12/1996
• Status: Expired due to Fees

• Current Assignee: Harada Industry Company Limited
• Original Assignee: Harada Industry Company Limited
• Inventors: Haneishi, Misao, Imamura, Yutaka
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): VANNUCCI, JAMES
• Application Number:
  US08/890,745
• Time in Patent Office: 837 Days
• Field of Search: 343/700 MS, 343/844, 343/893, 343/880, 343/757, 343/915, 343/908
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 21/065 Patch antenna array
• CPC Class Codes: H01Q 9/0457 electromagnetically coupled to the feed line
• CPC Class Codes: H01Q 9/0464 Annular ring patch

Abstract

A planar antenna comprises an emitting circuit plate having an emitting element made of a micro-strip antenna element, a first dielectric plate, and a feeder circuit plate having a feeder line, in which said feeder line are electromagnetically connected to said emitting element in said emitting circuit plate, and said emitting element is a ring circular emitting element containing a cross bridge conductor in the center thereof.

Claims

1. A planar antenna comprising:

a radiating circuit plate having a radiating element made of a micro-strip antenna element;

a first dielectric plate; and

a feeder circuit plate having a feeder line,

wherein said radiating element is excited by electromagnetically connecting said feeder line to said radiating element in said radiating circuit plate, and

said radiating element is a ring circular radiating element containing a cross bridge conductor in a center thereof.

2. A planar antenna according to claim 1, further comprising a first ground plate formed around said radiating element to surround said radiating element.

3. A planar antenna according to claim 1, further comprising a second dielectric plate and a ground plate.

4. A planar antenna according to claim 2, wherein an impedance matching between said radiating element and said feeder line is performed by adjusting a slot width of a ring slot between said radiating element and said first ground plate, a shape of a path of said feeder line, and a length of overlap area between said feeder line and said radiating element.

5. A planar antenna according to claim 2, further comprising a second dielectric plate and a second ground plate.

6. A planar antenna according to claim 1, wherein

said radiating element includes a plurality of radiating elements,

an array antenna having said plurality of radiating elements which are two-dimensionally arranged is provided, and

said plurality of radiating elements is arranged in a predetermined interval.

7. A planar antenna according to claim 1, wherein said radiating element contains a perturbation element.