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US 6,498,589 B1Granted
Antenna system
AssigneeDX Antenna Company, Limited
InventorShotaro Horii
Life of this patent
Estimating the term…
Abstract
An antenna system includes a VHF dipole antenna having a pair of rod elements disposed substantially in a line, and a UHF Yagi antenna having a radiator and a direction disposed on the rod elements.
Claims19
A multiple frequency band antenna system comprising:
- at least one dipole antenna for a first frequency band including a pair of rod elements arranged substantially in a line;
- and
- at least one Yagi antenna for a second frequency band higher than said first frequency band, said Yagi antenna having a radiator and a reflector, said radiator and reflector being spaced from each other on at least one of said rod elements and extending transverse to said at least one rod element.
An antenna system comprising:
- a Yagi antenna for a first frequency band including at least one director;
- and
- a plurality of Yagi antenna for a second frequency band higher than said first frequency band, having respective radiators disposed on said at least one director.
An antenna system comprising:
- an antenna for a first frequency band including a pair of rod elements mounted on a boom;
- and
- an antenna for a second frequency band higher than said first frequency band, including a radiator and a reflector for the second frequency band, said radiator and reflector being spaced from each other and mounted on said boom generally in parallel with said rod elements so as to function as directors for the antenna for said first frequency band.
An antenna system comprising:
- a body;
- and
- a plurality of Yagi antennas for a same frequency band disposed within said body, said Yagi antennas being located at different levels in said body and intersecting each other so as to be capable of receiving radio waves coming from different directions.
An antenna system comprising:
- a body;
- and
- a plurality of Yagi antennas so disposed within said body as to be able to receive radio waves coming from different directions, adjacent ones of said Yagi antennas being at different levels, Yagi antennas receiving radio waves coming from directions angularly spaced from each other by 180° being disposed in a same plane.
An antenna system comprising:
- an even number not smaller than four of rod antennas arranged to radially extend in a same plane, and a pair of feed terminals led from each of said rod antennas;
- one of a pair of feed terminals of each rod antenna forming a first feed section with one of a pair of feed terminals of one of two rod antennas adjacent to that rod antenna, and the other of said pair of feed terminals of that rod antenna forming a second feed section with one of a pair of feed terminals of the other of said two adjacent rod antennas, whereby a V-shaped antenna is formed.
An antenna system comprising:
- a plurality of antennas for a same frequency band disposed to receive radio waves coming from different directions;
- selecting means for selecting individual outputs of said antennas and combined outputs of pairs of adjacent ones of said antennas;
- and
- control means for providing a selection control signal to said selecting means.
1 more element
An antenna system comprising:
- a plurality of first antennas for a first frequency band disposed to receive radio waves in said first frequency band coming from different directions;
- a plurality of second antennas for a second frequency band, disposed to receive radio waves in said second frequency band coming from different directions, said second antennas being associated with respective ones of said first antennas;
- amplifying means equal in number to said first and second antennas, each of said amplifying means receiving outputs of one of said first antennas and one of said second antennas associated therewith;
- combining means for combining outputs of said amplifying means;
- and
- control means for selecting a state in which said amplifying means are individually energized and a state in which that one of said amplifying means which receives outputs from a pair of adjacent ones of said first antennas.
3 more elements
An antenna system comprising:
- a body;
- a plurality of Yagi antennas disposed in said body at different levels to receive radio waves in a first frequency band coming from various directions;
- and
- a plurality of rod antennas disposed in said body at a level different from said levels of said Yagi antennas, to receive radio waves in a second frequency band coming from various directions.
1 more element
A multidirectional antenna system comprising:
- a plurality of dipole antennas each including a pair of rod antennas, said rod antennas of each dipole antenna being disposed on opposite sides of a point on one of a plurality of straight lines crossing each other at said point, a different one of said straight lines being associated with each of said plurality of dipole antennas;
- and
- two feed terminals led out from each of said rod antennas.
Dependencies are inferred from the claim text.