JP3059388U - Radial mounting structure of mobile radio antenna - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a mobile radio antenna as an antenna capable of responding to different installation conditions. SOLUTION: A ground conductor 1 of a mobile radio antenna 1 is provided.
By attaching the radials 3 having a length corresponding to each frequency band to the plurality of radial mounting screw holes 1d formed in the c and using the same as a virtual ground, various installation conditions of the mobile radio antenna can be obtained. It is a radial mounting structure of an antenna for a mobile wireless device which can be adapted.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a radial mounted on an antenna for a wireless communication device.

[0002]

[Prior art]

 Since mobile radio antennas cannot be directly grounded to the ground, the housing of the equipment (eg, the body of an automobile) mainly used as a means of transportation functions as a virtual ground. Therefore, when this mobile radio antenna is installed in a fixed station, there is no virtual earth. Also, depending on the location of fixed stations (for example, apartment houses), grounding may not be possible, in which case the antenna cannot function properly.

[0003] A method is known in which when the antenna cannot be grounded by a wireless communication antenna, the antenna function is made normal by virtual ground. FIG. 5A shows that a ground effect is obtained by the antenna 11 and the ground plane 12 serving as a virtual ground, and the λ / 4 of a radio wave transmitted over the distance from the top of the antenna 11 to the ground plane 12 is shown. Set to. It is considered that the antenna 11 and the ground plane 12 are installed by raising the ground plane above the ground 16 and are called ground plane antennas. As a substitute for the ground plane 12, as shown in FIG. 5 (b), there is a radial plane which is replaced by four radials 13 having a length of λ / 4 of radio waves in the communication frequency band. Has the same grounding effect as the ground plane 12. In the virtual grounding type shown in FIG. 5C, the antenna 11 of the transmitter 15 and the radial 14 having a length of λ / 4 are provided at a height of 2 to 3 m from the ground 16. In this case, the radial 14 is called a counterpoise, and a grounding effect can be obtained similarly to the ground plane 12.

[0004]

[Problems to be solved by the invention]

 When a mobile station antenna is installed in a fixed station, a land area large enough to ground is required, but grounding is not possible in an apartment house. In addition, virtual grounds cannot be obtained with the vehicle mounted on the vehicle. Therefore, even if an antenna for a mobile radio used in a vehicle or the like is installed as it is for a fixed station, it cannot operate correctly as an antenna. The purpose of the present invention is to provide a detachable radial mounting structure for a virtual ground that can be used even under these adverse conditions when a mobile station antenna is equipped for a fixed station.

[0005]

[Means for Solving the Problems]

 The present invention relates to an antenna for a mobile radio, which is inserted into a connector of a base for mounting an antenna. Provided is a radial mounting structure for a mobile radio antenna.

According to the present invention, in order to change the function of the mobile radio antenna, a plurality of radials are attached to the adapter corresponding to the frequency band, and the adapter is detachably attached to the base of the mobile radio antenna. To provide a radial mounting structure.

According to the present invention, in order to change the function of a mobile radio antenna, an adapter equipped with a plurality of radials corresponding to a frequency band is sandwiched between an antenna mounting base and a mobile radio antenna. Provide a structure of an adapter to be fixedly mounted.

[0008]

[Embodiment of the invention]

 FIG. 1 is a diagram showing a radial mounting structure of a mobile radio antenna according to an embodiment of the present invention, in which (a) is an exploded perspective view, and (b) is an external view showing a part in cross section. . In the figure, 1 is an antenna for a mobile radio, 1a is an antenna element, 1b is a matching coil case for accommodating a matching coil 1e, 1c is a ground conductor, and 1d is a screw hole for radial mounting. 3 is a radial, 3a is a screw part, 4 is a base for mounting the antenna, and 4a is a connector to which the antenna is connected.

A plurality of radial mounting screw holes 1 d are provided in the ground conductor 1 c of the mobile radio antenna 1. The screw portion 3a of the radial 3 is screwed in there, and the radial 3 is fixed to the vertical mobile radio antenna 1 in the horizontal direction. The radial 3 is required for each frequency band to be used, and requires a length of λ / 4. A plurality of radials 3 according to the frequency band are attached so as to have a spread so as not to be affected by each other, so that a virtual earth is formed and transmission is not hindered.

FIG. 1B is a partial cross-sectional view showing the mounted state of the radial 3. The radial screw portion 3a is attached to the radial mounting screw hole 1d of the ground conductor portion 1c of the mobile radio antenna 1. The radial 3 is made of a material that is not easily rusted, such as stainless steel. The radial 3 is mounted and serves as a sufficient virtual ground conductor to obtain a virtual ground effect.

FIG. 2 is a view showing another embodiment of the radial mounting structure of the mobile radio antenna, FIG. 2 (a) is an exploded view, and FIG. 2 (b) is a partially sectional view. is there. Unlike the case of FIG. 1, the ground conductor 1c of the mobile radio antenna 1 has no radial mounting screw holes, and the radial is not directly mounted on the mobile radio antenna. Therefore, a ring-shaped adapter 2 made of a conductor to which the radial 6 is attached is used. The adapter 2 is inserted through the ground conductor 1c of the mobile radio antenna 1, and screwed into the antenna fixing screw hole 2a to fix it. A plurality of radials 6 corresponding to the frequency band are inserted into a plurality of radial insertion holes 2b of the adapter 2, and screws 2d are inserted into respective radial fixing screw holes 2c, and tightened and fixed to form a virtual ground.

As shown in the cross-sectional view of FIG. 2B, the radial 6 is inserted into the radial insertion hole 2b of the adapter 2 mounted on the ground conductor 1c, and is firmly fixed with the screw 2d. It becomes an antenna.

FIG. 4 is a diagram showing a variation of the adapter 2. FIG. 4A shows a shape obtained by cutting a part of the ring shape from the shape of the ring-shaped adapter 2 in FIG. 2, and the ground conductor 1 c of the mobile radio antenna 1 is inserted through the adapter 2. A screw 2d is screwed into the antenna fixing screw hole 2a in the ground conductor 1c, and the adapter 2 tightens the installation conductor 1c to fix it to the ground conductor 1c. FIG. 4 (b) is a view showing a modification of FIG. 4 (a), wherein the screw hole portion to be tightened is modified and the effect remains unchanged. The adapter 2 shown in FIG. 4C is divided into two parts, each of which is fastened to the ground conductor 1c. The radial mounting is performed in the same manner as in FIG.

FIG. 3 is a view showing another embodiment, FIG. 3 (a) is an exploded perspective view, and FIG. 3 (b) is an external view showing a partial cross section. In the figure, 5 is an adapter, and 3b of the radial 3 is a coil storage unit. Since the length of each of the radial 3 and the radial 6 in FIG. 2 is optimally λ / 4, for example, the frequency band is 10 m in a 7 MHz band, and 5.5 in a 14 MHZ band. It is 1.45 m in the 15 m and 50 MHz bands, 0.5 m in the 144 MHz band, and 0.17 m in the 430 MHz band. However, if the length is too long, it is difficult to install the antenna, so a coil is added to shorten the radial length. As an example, a 50 MHz radial is set to 60 cm, and a coil is connected to adjust to λ / 4.

The adapter 5 is placed so that the connector 4a of the antenna mounting base 4 is inserted, and the mobile radio antenna 1 is mounted in this state. At this time, the adapter 5 is fixed between the base 4 and the ground conductor 1c of the mobile radio antenna 1. A plurality of radials 3 corresponding to the frequency bands are attached to the adapter 5 as described above. Depending on the frequency band, it may be better to increase the number of radials 3 as in the case of the 50 MHz band. According to FIG. 3B, the base 4, the adapter 5 on which the radial 3 is mounted, and the mobile radio antenna 1 are fixed in an overlapping state, and the radial 3 has a sufficient grounding effect.

[0016]

[Effect of the invention]

 According to the present invention, a plurality of detachable radials are provided in accordance with the frequency band so that a mobile radio antenna capable of using a vehicle or the like as a virtual ground can be used freely even when grounding cannot be performed at other places. It can be used as a ground plane antenna by mounting it, and it can be easily used in two ways: use as a single antenna for in-vehicle use and use as a ground plane antenna. effective.

[Brief description of the drawings]

FIG. 1 is a diagram showing a radial mounting structure of a mobile radio antenna according to an embodiment of the present invention, wherein FIG. 1A is an exploded perspective view, and FIG. 1B is an external view showing a partial cross section.

FIGS. 2A and 2B are diagrams showing another embodiment of the radial mounting structure of the mobile radio antenna according to the present invention, in which FIG. 2A is an exploded perspective view, and FIG.

3A and 3B are views showing another embodiment of the radial mounting structure of the mobile radio antenna according to the present invention, wherein FIG. 3A is an exploded perspective view and FIG. 3B is an external view showing a partial cross section.

FIG. 4 is a view showing a variation of the adapter of the present invention.

5A and 5B are diagrams showing a relationship between a conventional antenna and a virtual ground, wherein FIGS. 5A and 5B show a ground plane antenna, and FIG. 5C shows a counterpoise.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mobile radio antenna 1a Antenna element 1b Matching coil case 1c Grounding conductor 1d Radial mounting screw hole 1e Matching coil 2,5 Adapter 2a Antenna fixing screw hole 2b Radial insertion screw hole 2c Radial screw hole 2d screw 3,6 Radial 3a Screw part 3b Coil housing part 4 Base 4a Connector 11 Antenna 12 Ground plane 13,14 Radial 15 Transmitter 16 Earth

Claims (3)

[Utility model registration claims] 1. A mobile radio antenna which is mounted by being inserted into a connector of a base for mounting an antenna, wherein a plurality of radials corresponding to a frequency band serving as a virtual ground are provided at an antenna base in order to equip fixed stations having different use conditions. A radial mounting structure for a mobile radio antenna, wherein the antenna is detachably mounted. 2. The radial mounting structure for a mobile radio antenna according to claim 1, wherein a plurality of radials are attached to the adapter corresponding to the frequency band, and the adapter is detachably attached to the antenna base. 3. The antenna according to claim 1, wherein an adapter to which a plurality of radials are mounted corresponding to a frequency band is attached so as to be fixed between the antenna mounting base and the antenna. The described radial mounting structure of the mobile radio antenna.