JPH0145126Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a doublet-type antenna used for transmitting and receiving ultra-high-frequency radio waves, and an ultra-high-frequency radio wave constructed by combining multiple elements of such antennas. The present invention relates to the structure of a direction finding antenna.

[Conventional technology]

Among the above, it is desirable that the antenna for direction finding in particular be installed at a higher location than other structures in order to improve the accuracy of direction measurement.

When equipping a ship with this type of antenna,
Similar to this antenna, it is often difficult to secure a location for installing indicator lights that need to be installed as high as possible on a ship.

This is because if a indicator light is installed near a direction-finding antenna, the indicator light and its cord will throw off the direction of the radio waves.

[Problem that the invention attempts to solve]

For this reason, it is conceivable to mount the antenna and the indicator light on one common support such as a mast. There is a problem in how to specifically configure a configuration for this purpose.

[Means for solving problems]

The present invention provides an indicator light approximately in the center of multiple doublet antennas, and by approximately equalizing the disturbance of radio waves caused by the indicator lights to each doublet antenna, the doublet antennas and indicator lights can be combined into one antenna.
It can be equipped on the mast of a book.

In FIG. 1, elements 11, 12, 13 and 14 of the doublet antenna are held by a top holder 21 and a bottom holder 22 of the doublet antenna.

The elements 11 to 14 are held in a waterproof structure by an upper surface holder 21 and a lower surface holder 22, and the doublet antenna coupling wire 31,
It is connected to the antenna switching device 4 at 32, 33 and 34.

The antenna switching device is, for example, a Doppler shift detector that sequentially switches and connects the elements 11 to 14 to the antenna lead line 41 using a diode switch, or a multiple doublet detector such as a directional rotator using a goniometer. - Contains a circuit that extracts a signal indicating the direction of arrival of radio waves from the antenna.

Although not shown, an impedance matching circuit can be inserted between the coupling lines 31 to 34 and the elements 11 to 14 in order to improve the transmission efficiency between them. The antenna lead line 41 is connected to an amplifier. The indicator light 5 is, for example, an incandescent light,
It is fixed with a socket 6 and is lit by power from a cord 51 of the indicator light.

As shown in the figure, the indicator light 5 is installed directly at the upper center of the holder 21, that is, at the center of the spacing between the elements 11 and 13, without using a support or the like. .

The cover 7 is made of plastic or glass material in a desired color such as red or blue.

A holding part 23 is provided at approximately the center of the lowermost part of the lower holder 22, and the mast 8 of the antenna is attached to the holding part 23, so that the entire invention can stand on its own at a desired height.

As shown in the figure, the antenna lead wire 41 and the indicator light cord 51 are wired inside the mast 8.

That is, the structure is such that the lead wire 41 and the cord 51 are drawn out from below the central portion of the lower holder 23.

[Effect of the invention] According to the invention, the indicator light 5 does not protrude above the antenna elements 11 and 13 and is arranged in a symmetrical position with respect to these elements, so that the disturbance of radio waves is caused by each element. Since it is virtually the same as if there were no interference, it does not cause direction finding errors, and the indicator light 5 can be placed in the center of the holder 21 without using a support or the like. Since it is directly assembled, there is no need to provide a special reinforcing structure to support the indicator light 5 even against severe vibrations caused by the ship's engine, making the overall structure simple and inexpensive. It has the advantage of being able to provide practical effects such as being able to provide goods.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a partial cross section of the present invention. 11, 12, 13, 14...Double antenna element, 21...Double antenna insulator top holder, 22...Double antenna insulator bottom holder, 23...
Holding part, 31, 32, 33, 34...Double antenna coupling line, 4...Antenna switching device,
41...Antenna leader line, 5...Indicator light, 6...
Indicator light socket, 7... Indicator light cover, 51
...Indicator light code, 8...Antenna mast.

Claims (1)

[Scope of Claim for Utility Model Registration] A direction-finding antenna device for a ship with a marking light, which has a structure in which a marking light is assembled to a direction-finding antenna installed on a mast or other support of a ship, which includes: (a) a plurality of antennas arranged in a vertical direction; (b) a holder that holds the root portion of the element and holds each of the elements at a predetermined distance; (c) an upper side of the central portion of the holder; an antenna device comprising: (d) a structure in which the antenna drawer and the cord of the indicator light are pulled out from below the central portion; .