Loop antenna apparatus with variable directivity
AssigneeSony Corporation
InventorsMasahiro Tada, Hirokazu Ichikawa, Mitsuo Fukushima, Koya Nakamichi, Koji Ouchi, Yoshio Ishigaki
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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.
Claims4
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.
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.
Dependencies are inferred from the claim text.