JPS6055703A - Portable radio antenna - Google Patents

Abstract

PURPOSE:To reduce troubles of replacement of an antenna by providing a conductor tube which has a feeding plug in one end and has a plug to an external antenna in the other end and setting an antenna pole in this conductor tube so that this antenna pole is freely inserted to the pulled out from the conductor tube. CONSTITUTION:When a radio equipment is used as a portable, an antenna pole 2c is pulled out from a conductor tube 2d, and it is operated as a half-wavelength dipole antenna when an external connection plug 2b is opened. When the external antenna is used, the pole 2c is stored in the conductor tube 2d, and a coaxial cable is constituted with the pole 2c as a core and as the conductor tube 2d as an outside conductor when the pole 2c is brought into contact with an antenna pole receiving metal 2f, and power is supplied from a feeding plug 2a to the external stationary antenna through this coaxial cable and the plug 2b. Thus, troubles of replacement of the antenna are reduced, and the radio equipment can be used while attaching always the portable radio antenna to the radio equipment body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a portable radio antenna that operates as a power supply connector to an external antenna by housing an antenna pole in a conductor tube.

[Prior art]

- Conventionally, there was a device of this type as shown in FIG.

In the figure, l is the radio main body, 2 is a portable radio antenna detachably attached to the radio main body 1, 3 is an externally installed antenna, 4 is an externally installed antenna connected to the antenna 3, This is a coaxial cable that includes the radio device main body 1 and a detachable plug 4a.

Next, the operation of this prior art will be explained. When using the radio main body 1 as a portable device, a portable radio antenna 2 is attached to the radio device main body 1. The radio antenna 2 is removed from the radio main body 1, and instead, an externally installed antenna 3 is connected to the radio main body 1 via a coaxial cable 4. As described above, depending on the purpose and location of the radio, the L antenna is attached or replaced, and transmission and reception are performed through that antenna.

Conventional portable radio antennas are constructed as described above, so when using externally installed antenna 3, portable radio antenna 2 must be removed, and antennas with antennas require a lot of effort to replace. When the radio antenna 2 is removed, it is easy to lose it, and furthermore, when it is installed externally, the impedance of the antenna 3 must be the same as the impedance of the portable radio antenna 2.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional antennas as described above. By simply inserting the antenna pole of a mobile radio antenna into a conductor tube, this part forms a kind of Q-matching circuit. The purpose of external installation of connection plugs with different impedances is to provide a portable radio antenna that operates as a power feeding device that can be matched even when connected to an antenna.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Second
In the figure, 1 is the main body of the radio, 2 is a portable radio antenna that is attached to the radio main body 1 and is equipped with a connection plug 2b to an external antenna, 3 is an antenna that is installed externally, and 4 is the antenna that is installed externally. is a coaxial cable connected to the antenna 3 and provided with an external connection plug 2b of the portable radio antenna 2 and a detachable plug 4a.

FIG. 3 is an enlarged perspective view showing the main parts of FIG. 2, where 2a is a power supply connector that connects the radio main body 1 and the portable radio antenna 2, 2b is a connector for connecting to an external antenna, and 2C is approx. An antenna pole consisting of a quarter-wavelength conductor rod, 2d is a conductor tube that can accommodate this antenna pole 2C, and 2e is connected to the core wire 21 of the power supply connector 2a, and the antenna pole 2C slides inside while making contact with it. contact ring, 2f
2g has a structure that makes contact with the antenna pole 2C when it is stored, and the antenna ball holder connected to the two core wires of the external connection plug 2b is made of gold, and the antenna pole 2C can slide inside it, and the conductor tube 2d. This is an insulating tube installed inside, which can be pulled out from the conductor tube 2d by pulling out the core wire 21 of the power supply plug 2a from the contact ring 2e. It can be replaced with an insulating tube.

Next, the operation will be explained. When using the radio as a portable device, when the antenna pole 2c is pulled out from the conductor tube 2d and the external connection plug 2b is opened, it operates as a half-wavelength dipole antenna. Furthermore, when using the external antenna 3, the antenna pole 2c is housed inside the conductor tube 2d,
When the antenna ball receiver is brought into contact with the metal 2f, it forms a coaxial cable in which the antenna pole 2c is the core wire and the conductor tube 2d is the outer conductor, and the coaxial cable and the external connection plug 2b are connected to the power supply plug 2a. Via the external installation can feed the antenna 3. Furthermore, in the case of this embodiment, the length of the conductor tube 2d is approximately 1/4 wavelength, and by appropriately selecting the characteristic impedance of this portion when the antenna pole 2c is housed, a Q-matching circuit is constructed. and can be connected to an external antenna of any impedance. Note that by replacing the insulating tube 2g with one having a different dielectric constant, the characteristic impedance of the quarter-wavelength line constituted by the conductor tube 2d and the housed antenna pole 2C can be changed.

In addition, in the above embodiment, the antenna pole is about 1/4
I explained about the wavelength, but this antenna pole 2
c can be of any length, and may be a rondo antenna as shown in FIG.

Further, in the above embodiment, the length of the conductor pipe is 1/4
Although the wavelength is shown, the length of this conductor tube may be equal to a quarter wavelength plus an integral multiple of a half wavelength.

〔Effect of the invention〕

As described above, according to the present invention, in order to add a power feeding function to an external antenna to a portable antenna, a conductor tube having a power feeding plug at one end and a connecting plug to an external antenna at the other end is provided, Since the antenna pole is attached to this conductor tube so that it can be taken in and out, there is less need to attach and replace the antenna, and the portable radio antenna can always be used with it attached to the radio, so there is no risk of losing it. There is.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional portable radio antenna;
FIG. 3 is a perspective view showing a portable radio antenna according to an embodiment of the present invention, FIG. 3 is an enlarged sectional perspective view showing the main part of FIG. 2, and FIG. 4 is a perspective view showing another embodiment of the invention. It is. In the figure, 2a is a power supply connector, 2b is an external connection connector, 2C is an antenna ball, 2 is a conductor tube, 2e is a contact ring, 2f
The antenna ball holder is gold, 2g is an insulating tube, 2 is a portable radio antenna, and 3 is an external antenna≠≠≠. In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) A conductor tube that has a power supply connector on one end and an external connection connector to an external antenna on the other end, and is installed in the conductor tube so that it can be inserted and removed freely, and when it is protruded, it receives power from the power supply connector and acts as an antenna and is stored. A portable radio antenna comprising: an antenna ball that forms a coaxial cable together with the conductor tube between the power supply plug and the external connection plug. (2) The portable radio antenna according to claim 1, wherein the length of the conductor tube is about a quarter wavelength or an integral multiple of a half wavelength.