JP3171232B2 - Manufacturing method of monopole antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method of manufacturing a monopole antenna for a wireless communication system.

[0002]

2. Description of the Related Art Several methods have been proposed for manufacturing monopole antennas and their derivatives for use in wireless systems.

FIGS. 9A and 9B show examples of a conventional dipole structure (Antenna theory and design, WLStu).
tzman and GAThiele, John Wiley and sons Ed., 198
1, pp.87-94). It consists of wires that are slightly shorter than the desired operating frequency wavelength. This wire 14
It stands vertically on the horizontal metal plate 15. Wire 14
Is a coaxial line 1 through an opening 17 provided in a metal plate 15.
6 is fed by the center feed.

FIG. 10 shows another conventional disk monopole structure (Honda S. et al, A disk monopole an).
tenna with 1: 8 impedance bandwidth and omnidirecti
onal radiation pattern, Proceeding of ISAP '92,
Sapporo, pp.1145-1148). It consists of a planar disk monopole 18 connected to a coaxial line 19 as described above. The disks are arranged vertically and perpendicular to the metal plate 20. The coaxial line 19 passes through an opening 21 provided in a metal plate 20.

FIG. 11 shows another conventional example (Mobi
le Antenna System Handbook, K. Fujimoto, JR James,
Artech House, 1994, pp132-135). This method has a configuration in which a thin wire of the conventional example shown in FIG.

[0006]

One of the problems in the prior art is the time required for disposing the radiation structure and the processing steps. For this reason, the manufacturing cost increases.

That is, in the power supply system used for these structures, since the connector must pass through the substrate, that is, the metal plate, some processing steps are added. In these steps, an opening is formed in the substrate to fix the connector.

Several other steps are required to match the antenna to the feed system. this is,
This is because it depends on the height separating the antenna from the ground plane. Therefore, the radiation structure is soldered many times,
Must be peeled off.

In the prior art, it is impossible to provide both the active part and the radiating structure on the same plane.

That is, since the antenna is connected to the coaxial line passing through the substrate, the antenna must be passed through the substrate again in order to provide the active part of the system and the antenna on the same plane.

[0011] This leads to more connection losses and is forbidden.

Therefore, an object of the present invention is to provide a method of manufacturing a monopole antenna in which a monopole antenna element is connected on the same substrate surface as a power supply circuit, thereby reducing the number of processing steps and facilitating adjustment. To provide.

[0013]

According to the present invention, a background substrate is prepared, a power supply line is printed on the background substrate, and a power supply line connected to the power supply line is connected to the background substrate. Port, and a metal aperture with predetermined dimensions.
Providing an antenna element;
By sliding along the wire path,
The part of the wire path where the best matching was obtained is specified
And the lower part of the antenna element is
And a method of manufacturing a monopole antenna, comprising connecting to a predetermined portion .

Further, a corner reflector is prepared by assembling two flat plates of a predetermined size with one side being a common edge, arranging the corner reflector on the background substrate, and providing an antenna for the antenna element. Preferably, the method includes maintaining a distance between an axis and the common edge at a value that allows optimum matching, and providing an opening in the corner reflector to avoid contact with the feed line.

[0015] It is also preferable to provide a metal member for covering the upper part of the antenna element.

It is also preferable that the method further includes adjusting an inclination angle of the metal member with respect to the antenna axis.

[0017] The metal member is used for the corner reflector .
It is also preferred to include connecting .

The antenna element may be directly soldered to the feed line.

The antenna element may be supported by a support and brought into contact with the feed line.

It is preferable to arrange the antenna element in an electromagnetic housing which does not cause interference with radiation.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a method for manufacturing a monopole antenna according to a first embodiment of the present invention will be described with reference to FIG. This monopole antenna has a structure in which a lower portion of an antenna element 1 as a radiation element made of a metal structure having a predetermined dimension is connected to a feed line 2 made of a microstrip line. The power supply line 2 is printed on a horizontal background substrate 3 and supplied with power by a power supply port 4. Distance S from connection 5 between antenna element 1 and feed line 2 to port 4
Is adjusted to a specific value for optimal matching by sliding the antenna element 1 along the feed line 2.

FIG. 2 shows a measurement example in the case where the feed line 2 is a 50 ohm line and the antenna element 1 is a radiation structure of a double cross type monopole structure having a height of 5 cm. As can be seen, better than 15 dB matching was obtained, especially for the two predicted frequencies of 1.7 and 4.2 GHz. The gain of this structure is an omnidirectional pattern, as shown in FIG.

FIG. 4 shows a second measurement example. In this example,
The feed line 2 is a 50 ohm line, and the antenna element 1 has a double cross type hexagonal radiation structure. The height of one hexagon of the antenna element 1 is 2 cm, and the other is 1 cm.
It is.

Here, too, the matching better than 15 dB is shown for the priority frequency determined by the wide area numerical calculation. Each of these frequencies is 3.2
And 8.6 GHz. In FIG. 5, the obtained radiation pattern shows the omnidirectional characteristics of the antenna.

Next, a method for manufacturing a monopole antenna according to the second embodiment of the present invention will be described with reference to FIGS. 6 (a), 6 (b) and 6 (c). In this monopole antenna, a metal structure antenna element 1 having a predetermined dimension is connected to a feed line 2 at a lower portion thereof. This feed line 2 is printed on a background substrate 3 and fed by a port 4. The distance from the contact portion 5 between the antenna element 1 and the feed line 2 to the port 4 is adjusted to a specific value for optimal matching.

Further, a corner reflector 10 is provided.
The corner reflector 10 is formed by assembling two flat plates 6 and 7 having predetermined dimensions with one of the sides serving as a common edge 8. These flat plates 6 and 7 are arranged at positions corresponding to the feeder line 2 on the background substrate 3. At that time, the distance between the axis of the antenna of the antenna element 1 and the common edge 8 is kept at a certain value for optimal matching.

The corner reflector 10 is provided with an opening or notch 9 to avoid contact with the feed line.

With reference to FIGS. 7A and 7B, a method of manufacturing a monopole antenna according to the third embodiment of the present invention will be described. In this monopole antenna, the upper part of the antenna element 1 is covered with a metal member 11 made of a metal plate or a structure. The metal member 11 is connected to the corner reflector 10. The corner reflector 10 is inclined at a certain inclination angle θ with respect to the antenna axis of the antenna element 1, that is, the vertical axis.

The metal member 11 is the corner reflector 1
It may be away from zero. Corner reflector 10
May be perpendicular to the antenna axis of the antenna element 1.

As shown in FIG. 8A, the antenna element 1 may be directly connected to the feed line 2 by soldering 23, or may be a separate component attached to the background substrate 3. 12 and may be brought into contact with the feed line 2. Further, the antenna element 1 is disposed in a transparent electromagnetic housing 13 having a shape that does not cause interference due to radiation.
Is preferably arranged.

[0031]

As described above, according to the present invention,
The time required for adjustment and the number of processing steps can be reduced, and the cost can be reduced. In other words, by moving the antenna element along a feed line for feeding the antenna element, adjustment to a specific value for obtaining optimum matching is easily achieved, and the time required for the adjustment is reduced.

Further, since it is not necessary to process the connector and the opening on the substrate, the cost can be reduced as compared with the prior art.

Further, according to the present invention, it is possible to provide both an active element and a radiating element on the same plane. That is, since the antenna element is directly connected to the microstrip line, the active part of the system can be connected to the same line on the same plane.

[Brief description of the drawings]

FIG. 1 is a perspective view of a monopole antenna manufactured by a manufacturing method according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating matching performance in a first measurement example of the monopole antenna of FIG. 1;

FIG. 3 is a diagram showing a radiation pattern in a first measurement example of the monopole antenna of FIG. 1;

FIG. 4 is a diagram illustrating matching performance of the monopole antenna of FIG. 1 in a second measurement example.

FIG. 5 is a diagram showing a radiation pattern in a second measurement example of the monopole antenna of FIG. 1;

6A and 6B show a monopole antenna manufactured by the manufacturing method according to the second embodiment of the present invention, wherein FIG. 6A is a perspective view, FIG. 6B is a side view, and FIG. .

7A and 7B show a monopole antenna manufactured by a manufacturing method according to a third embodiment of the present invention, wherein FIG. 7A is a perspective view and FIG. 7B is a side view.

FIG. 8 shows various modifications of the present invention, wherein (a),
(B), (c) is a perspective view of a monopole antenna.

FIG. 9 is a diagram showing a conventional wire monopole structure.

FIG. 10 is a diagram showing a conventional disk monopole structure.

FIG. 11 is a diagram showing a conventional wire monopole corner reflector structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna element 2 Feeding line 3 Background board 4 Port 5 Connection part 6, 7 Flat plate 8 Common edge 9 Opening or notch 10 Corner reflector 11 Metal member 12 Supporting body 13 Electromagnetic housing S Distance

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI H01Q 15/18 H01Q 15/18 19/13 19/13 (56) References JP-A-48-94345 (JP, A) JP-A-48-94345 JP-A-7-336133 (JP, A) JP-A-4-172001 (JP, A) JP-A-3-22415 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01Q 1 / 00-1/52 H01Q 9/30 H01Q 15/00-19/32 H01P 5/08

Claims (8)

(57) [Claims] 1. providing a background substrate;
The background printing a feeder line on a substrate, the background board the feed line to the provision of the connection port for feeding, the dimension a predetermined
Preparing a metal antenna element having a method,
Slide the antenna element along the feed line
In this way, optimum matching can be obtained among the feeder lines.
The specified part as a specific part, and
Connecting a lower part of the antenna element to the specific portion . 2. A method for preparing a corner reflector, comprising: assembling two flat plates having predetermined dimensions with one side serving as a common edge; arranging the corner reflector on the background substrate; 2. The method according to claim 1, further comprising: maintaining a distance between an antenna axis of the common reflector and the common edge at a value at which optimum matching is obtained; and providing an opening in the corner reflector to avoid contact with the feed line. Manufacturing method of monopole antenna. 3. The method of manufacturing a monopole antenna according to claim 2, further comprising providing a metal member that covers an upper part of said antenna element. 4. The method of manufacturing a monopole antenna according to claim 3, further comprising adjusting a tilt angle of said metal member with respect to said antenna axis. 5. The corner reflector according to claim 1 , wherein
4. The method for manufacturing a monopole antenna according to claim 3, further comprising connecting to the monopole antenna. 6. The method according to claim 1, wherein the antenna element is directly soldered to the feed line. 7. The method for manufacturing a monopole antenna according to claim 1, wherein the antenna element is supported by a support and is brought into contact with the feed line. 8. The antenna element according to claim 1, wherein said antenna element is disposed in an electromagnetic housing which does not cause interference with radiation.
The method for manufacturing a monopole antenna according to any one of the above.