Antenna apparatus

• US 5,973,650 A
• Filed: 11/03/1997
• Issued: 10/26/1999
• Est. Priority Date: 11/22/1996
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Nakanishi, Hideo
• Primary Examiner(s): Wimer, Michael C.
• Application Number:
  US08/962,656
• Time in Patent Office: 722 Days
• Field of Search: 343/748, 343/741, 343/742, 343/743, 343/744, 343/702, 343/867
• US Class Current: 343/742
• 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 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 7/005 with variable reactance for tuning the antenna

Abstract

An antenna apparatus is disclosed which comprises: a printed circuit board; a first loop antenna, arranged along one side of the printed circuit board, wound more than one turn; a second loop antenna, arranged along the side, wound less than one turn, one end of the first loop antenna and one end of the second loop antenna being fixed to a first area on the printed circuit board near the side; and a capacitor, fixed to a second area of the printed circuit board remote from the first area near the side, having one end connected to another end of the first loop antenna and another end connected to another end of the second loop antenna. In the antenna apparatus, the first and second loop antennas may comprise conductive rods. In the antenna apparatus, the first and second loop antennas may comprise stripe conductive plates. In the antenna apparatus, the first area and second area are remote with a distance from 5 mm to 15 mm, or a distance more than 15 mm to 30 mm, favorably, or a distance more than 30, most favorably.

Claims

1. An antenna apparatus comprising:

a printed circuit board;

a first loop antenna arranged along a side of said printed circuit board, said first loon antenna being wound more than one turn;

a second loop antenna arranged along said side, said second loop antenna being wound less than one turn,

a first end of said first loop antenna and a first end of said second loop antenna each being fixed to a first area at a feeding point on said printed circuit board that is proximal to said side; and

a capacitor being fixed to a second area of said printed circuit board adjacent to said side and distal from the first area of said printed circuit board where said first end of each of said first loop antenna and said second loop antenna are attached,

said capacitor having one end connected to a second end of said first loop antenna and another end connected to a second end of said second loop antenna.

2. The antenna apparatus according to claim 1, wherein said first and second loop antennas further comprise conductive rods.

3. The antenna apparatus according to claim 1, wherein said first and second loop antennas further comprise stripe conductive plates.

4. The antenna apparatus according to claim 1, wherein the first area and the second area are spaced apart from each other by a distance ranging from about 5 mm to 15 mm.

5. The antenna apparatus according to claim 1, wherein the first area and the second area are spaced apart from each other by a distance ranging from about more than 15 mm to 30 mm.

6. The antenna apparatus according to claim 1, wherein the first area and the second area are spaced apart from each other by a distance of more than 30 mm.

7. An antenna apparatus according to claim 1 wherein said capacitor is electrically connected in series between the second end of said first loop antenna and the second end of said second loop antenna so that said capacitor is positioned at an intermediate point between said first loop antenna and said second loop antenna;

and

each first end of said first loop antenna and said second loop antenna is electrically connected at a respective feeding point.

8. An antenna apparatus according to claim 1 wherein said first loop antenna and said second loop antenna are located outside of a perimeter of said printed circuit board.