JPS622809Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wideband antenna, particularly a 4-dipole antenna, which has excellent VSWR characteristics over a wideband.

Until now, there was no single antenna that could cover the UHF-TV broadcast band from 470 to 890 MHz.

Therefore, if the channel to be used was outside the band, a suitable channel within the band had to be created.

However, the former method has the disadvantage that the characteristics are very poor, and the latter method is very expensive and is not practical.

As a result of conducting research in light of these conventional techniques, the inventors of the present invention have improved the characteristics, especially the VSWR (voltage standing wave ratio) characteristics, which conventionally had limitations even if the length and width of the antenna element were variously changed. We have developed an antenna that can provide a wide band without disturbing the radiation characteristics.

That is, the present invention is characterized in that a metal element is provided that protrudes from the two secondary parallel lines toward the two primary parallel lines. This metal element becomes a capacitive reactance and has the effect of creating a negative sequence voltage component, so in the low frequency range of 460 to 560 MHz.
Significantly improves VSWR characteristics.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a front explanatory view of one embodiment of the present invention;
The figure is an explanatory side view of the same, where 1 is a feeding point, 2 is a primary parallel 2 lines, 3 is a secondary parallel 2 lines, 4 is a radiating element, 5 is a reflector, 6 is a metal element, and 7 is a support column. It is.

A radiating element 4 is connected to the feed point 2, a primary parallel 2 wire 2, a secondary parallel 2 wire 3 to the tip of the primary parallel 2 wire 2, and a radiating element 4 to the secondary parallel 2 wire 3. and is supported by a reflecting plate 5. A metal element 6 is provided from the secondary parallel lines 3 to the primary parallel lines 2. The metal element 6 is the third
As shown in the figure, it consists of a circular plate coupling ring 8, a lock nut 9, and a support column 10, and the support column 10 is threaded so that the height of the coupling ring 8 can be changed. This coupling ring 8 becomes a capacitive reactance and acts to create an anti-sequence voltage component, resulting in a filter reduction of 460 to 560 MHz.
Improve VSWR.

Further, by appropriately selecting the height and size of the coupling ring 8, appropriate VSWR characteristics can be obtained.

FIG. 4 shows another example of the metal element 6.
A coupling ring 11 is attached to a bolt 12. Therefore, by providing female threads on the two secondary parallel wires 3 and changing the threading depth of the bolt 12, the magnitude of the reactance can be changed.

As explained above, according to the present invention, a very simple method of providing a metal element protruding from two secondary parallel lines toward two primary parallel lines can be used.
Broadband VSWR characteristics can be achieved. Furthermore, since the metal elements are provided on two parallel power feeding lines, radiation characteristics such as directional characteristics and phase directional characteristics are not disturbed.

[Brief explanation of the drawing]

FIG. 1 is an explanatory front view of one embodiment of the present invention, FIG. 2 is an explanatory side view thereof, and FIGS. 3 and 4 are explanatory views of a metal element. 1... Feeding point, 2... Primary parallel 2 wires, 3... 2
Two parallel lines, 4... radiating element, 5... reflecting plate, 6... metal element.

Claims (1)

[Scope of claims for utility model registration] (1) First-order parallel 2 from the feed point provided on the reflector
In a broadband antenna configured to feed power to a radiating element through a wire and two secondary parallel wires sequentially, a metal element is provided that protrudes from the two secondary parallel wires toward the two primary parallel wires. Features a wideband antenna. (2) The metal element is composed of a support column and a circular plate provided at the tip of the support column, and the circular plate is configured such that the distance from the two secondary parallel lines is variable. A broadband antenna according to claim 1 of the utility model registration claim characterized by: