Loop antenna apparatus with variable directivity

• US 4,358,769 A
• Filed: 02/11/1981
• Issued: 11/09/1982
• Est. Priority Date: 02/15/1980
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Tada, Masahiro, Ouchi, Koji, Ishigaki, Yoshio, Nakamichi, Koya, Ichikawa, Hirokazu, Fukushima, Mitsuo
• Primary Examiner(s): Moore, David K.
• Application Number:
  US06/233,387
• Time in Patent Office: 636 Days
• Field of Search: 343/742, 343/743, 343/744, 343/741, 343/702
• US Class Current: 343/742
• CPC Class Codes: H01Q 3/247 by switching different parts of a primary active element
• 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

Abstract

A loop antenna apparatus is disclosed which includes a main conductive loop arranged on a first surface, a plurality of supplemental conductive loops connected to the main conductive loop and arranged on different surfaces from the first surface, respectively, a plurality of signal feeding points provided in different loops of the main and supplemental conductive loops, an output terminal and change-over switches for selectively connecting one of the plurality of signal feeding points to the output terminal.

Claims

1. A loop antenna apparatus comprising:

a main conductive loop arranged on a first flat surface;

first and second supplemental conductive loops connected to said main conductive loop and arranged on second and third flat surfaces perpendicular to said first flat surface, respectively;

third supplemental conductive loop connected to said first and second supplemental conductive loops and arranged on a fourth flat surface parallel to said first flat surface and perpendicular to said second and third flat surfaces;

first and second signal feeding points provided in said main conductive loop and said first supplemental conductive loop, respectively;

an output terminal; and

means for selectively connecting one of said first and second feeding points to said output terminal.

2. A loop antenna apparatus according to claim 1, wherein said first, second, third and fourth flat surfaces define a rectangular parallelepiped.

3. A loop antenna apparatus comprising:

a top plate and a plurality of frames arranged to define a rectangular parallelepiped having six planes;

a plurality of conductive plates mounted on said top plate and said plurality of frames near the peripheral portions of said six planes, said plurality of conductive plates forming a main conductive loop on a first plane of said six planes and a plurality of supplemental conductive loops formed on different planes of said six ones from said first plane;

a plurality of signal feeding points provided in different loops of said main and supplemental conductive loops;

an output terminal; and

means for selectively connecting one of said plurality of signal feeding points to said output terminal.

4. A loop antenna apparatus according to claim 3, wherein said top plate and said plurality of frames are designed to form a television stand and output signals from said output terminal are supplied to said television receiver.