Dx Antenna Company, Limited

Shotaro Horii

Eiji Shibuya

Toshiaki Shirosaka

Shingo Fujisawa

Kiyotaka Tatekawa

A radiator includes two radiating elements having a shape symmetrical with respect to an axis, and a transmission line portion connecting the tip end portions of these two radiating elements to each other. The radiating element has at least part of outer shape formed such that its distance from the axis increases with increasing distance from a midpoint of a line segment joining feed points to each other along the axis. Two radiator having such a shape are arranged along the receiving direction of electric waves and are fed with a phase difference, thereby realizing a miniaturized high-performance antenna apparatus.

Antenna apparatus

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 director disposed on the rod elements.

Antenna system

Antennas ( ) are disposed within an antenna body ( ) of an antenna system in such a manner as to receive UHF band radio waves coming to the main body ( ) from a plurality of first, different directions around the main body ( ). Combinations of the antennas ( ) makes the antenna system possible to receive UHF band radio waves coming to the main body ( ) from a plurality of second, different directions between adjacent ones of the first directions. Switches ( ) disposed within the main body ( ) select one of outputs provided by the individual antennas ( ) and their combinations. An antenna controller ( ), a unit separate from the main body ( ), supplies a selection control signal to the switches ( ). The antenna controller ( ) provides such a selection control signal as to successively select the direction of the radio wave to be received in the clockwise direction about the main body ( ) each time a first operating element ( ) on a remote control ( ) is operated, and provides such a selection control signal as to successively select the direction of the radio wave to be received in the counterclockwise direction each time a second operating element ( ) on the remote control ( ) is operated.

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.

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Kobe, Japan

Shotaro Horii