JPH0474003A - Portable antenna - Google Patents

Abstract

PURPOSE:To facilitate the installation and removal by devising the simple antenna installation such that a main pole and each load resistance type anchor pole are installed perpendicularly to ground and antenna elements are stretched out between the upper ends of them. CONSTITUTION:The antenna is installed in a simple way such that a main pole 1 and each load resistance type anchor pole 3 are installed perpendicularly to ground, antenna elements 4 are stretched out between upper ends of them and the lower end of the main pole 1 and the lower end of each load resistance type anchor pole 3 are connected by a ground wire 5. Then the installation and the removal are implemented quickly. Moreover, in this embodiment, the length of the antenna element 4 is extended by selecting the distance between the main pole 1 and each load resistance type anchor pole 3 and the antenna is used as an antenna for an HF band. Furthermore, since the lower end of the main pole 1 and the lower end of each load resistance type anchor pole 3 are connected by the ground wire 5, it is not required to implement grounding to ground different from the installation type tip loading dipole antenna, and then the antenna installation is implemented quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a portable antenna in the HF band.

[Conventional technology]

Conventionally, portable antennas are tablet type,
Whip type antennas are known.

As shown in FIG. 3, the tablet type antenna includes two antenna elements 101 and a power feeding section 102 connected to each antenna element 101, and is widely used for each vocal range.

Furthermore, as shown in FIG. 4, the whip type antenna includes one antenna element 103 and a power feeding section 104 connected to this antenna element 103, and is mainly used for mobile radio telephones in the microwave band. .

[Problem to be solved by the invention]

However, when such a conventional portable antenna is used for communication in the HF band, etc., there is a problem in that the antenna element becomes too large and the structure supporting it becomes complicated.

In addition, there is a problem in that it is difficult to widen the frequency band with such tablet left type and whip type antennas.

In view of the above circumstances, the present invention widens the frequency band and
It is an object of the present invention to provide a portable antenna that can be used in various bands and has a simplified structure that makes it easy to install and remove.

[Means to solve the problem]

In order to solve the above problems, the portable antenna according to the present invention includes a main pole that is vertically installed on the ground, and two retaining poles that are vertically installed at a predetermined distance from the main pole. , a load resistor attached to each of the retaining poles, and an antenna element stretched between the upper end of each of the retaining poles and the upper end of the main pole, the antenna element and the load resistor type The antenna is constructed of a dipole-type HF band tip-loaded antenna with a fastening pole.

[Effect]

In the present invention, since the above-mentioned structure is adopted, the main pole and each load resistance type retaining pole are hung two times from the ground, and 72 and 7 elements are stretched between the upper ends of these poles. Now you can install Ayu Tena. You can also remove this antenna by simply doing the opposite.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIG.

FIG. 1 is a perspective view showing a portable antenna according to an embodiment of the present invention.

The portable antenna shown in this figure includes an insulating main pole 1 that is vertically installed on the ground, a plurality of branch lines 2 that support the main pole 1, and a vertically installed antenna that is a predetermined distance away from the main pole 1. Two retaining poles 3, a plurality of branch lines 7 supporting each of these retaining poles 3, and two antennas stretched between the upper end of each of the retaining poles 3 and the upper end of the main pole l. element 4, a power feed W6 connected to each of these antenna elements 4, and this feed line 6
and the coaxial cable IO, and two ground wires 5 that electrically connect the lower ends of each of the load resistance type retaining poles 3 and the lower ends of the main pole 1.
It is equipped with

As shown in FIG. 2, each of the antenna elements 4
, each load resistance type retaining pole 3, and the ground vA5 constitute a tip load type dipole antenna.

As described above, in this portable antenna, the main pole 1 and each of the load resistance type retaining poles 3 are suspended from the ground, and the antenna element 4 is stretched between the upper ends of these poles. The antenna can be installed simply by connecting the lower end of the load resistance type retaining pole 1 and the lower end of each load resistance type retaining pole 3 through the ground wire 5, so that the installation work can be speeded up. Moreover, since the antenna can be removed by simply performing the reverse operation, the removal work can be done quickly.

Furthermore, in this embodiment, the length of each antenna element 4 can be increased by adjusting the distance between the main pole 1 and each load resistance type retaining pole 3, so this can be used as an HF band antenna. can be used.

In addition, since the lower end of the main pole 1 and the lower end of each load resistance type retaining pole 3 are connected by the ground wire 5,
There is no need to perform grounding on the ground unlike with installed type tip-loaded dipole antennas. This makes it possible to speed up the antenna installation work.

In addition, although the ground wire 5 is used in the above-mentioned embodiment, if the antenna installation work is not necessary (if it is not necessary to do so, it is necessary to ground the antenna wire 5 by grounding it on the ground as in the case of a fixed-type tip-loaded dipole antenna). 5 may be omitted.

[Effects of the Invention] As explained above, according to the portable antenna according to the present invention, the frequency band can be widened and it can be used in the HF band, and the structure can be simplified and its installation and
This has the effect of making removal easier.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a portable antenna according to an embodiment of the present invention, Fig. 2 is an equivalent circuit diagram of the embodiment of Fig. 1, and Fig. 3 is an example of a conventionally used portable antenna. FIG. 4 is a circuit diagram for explaining another example of a conventionally used portable antenna. In the figure, 1 is the main pole, 3 is the retaining pole, and 4 is the main pole.
is an antenna element, 5 is a ground wire, and 8 is a load resistance. Note that the same reference numerals in the figures indicate the same or equivalent parts. Patent applicant: Ryozo Tsutsui, Director of Technology Research Headquarters, Defense Agency

Claims (1)

[Claims] (1) In a portable antenna, a main pole is installed vertically to the ground, two retaining poles are installed vertically at a predetermined distance from the main pole, and a load resistor is attached to each of these retaining poles. and an antenna element stretched between the upper end of each of the retaining poles and the upper end of the main pole, and the antenna element and the load resistor
A portable antenna characterized by having a band tip loaded dipole type antenna.