JP2801486B2 - Antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for a base station in a mobile communication system, and more particularly to a radome in which two printed antennas with corner reflectors (reflectors) are housed in one radome. The present invention relates to an antenna device whose radius can be reduced, whereby the size and weight can be reduced.

[0002]

2. Description of the Related Art FIG. 5 is a view showing an example of a conventional antenna device. In the case where a feeding terminal is arranged behind a reflector, a printed dipole with two corner reflectors (reflectors) in one radome. Fig. 2 shows an antenna device that houses an antenna.

In the figure, 1 is a radome, 21 and 22 are antenna substrates, 31 and 32 are feed terminals, 41 and 42 are excitation elements, 51 and 52 are corner reflectors (reflectors), 6
Reference numerals 1 and 62 represent bisectors of the angle of the corner.
The antenna substrates 21 and 22 are configured to pass through bisectors 61 and 62 of the corner angles of the corner reflectors 51 and 52, respectively.

[0004] The main radiation direction of each antenna is the direction of the bisectors 61 and 62 of the corner angle, and the angle formed by θ is θ.
And When this antenna is used as a mobile communication base station antenna, θ is 120 ° or 60 °. Here, the length L of the antenna substrates 21 and 22 is the same as that when one surface is stored in one radome, and the feeding terminals 31 and 32 are arranged behind the reflector as in the case of one surface storage. It has made work easier.

[0005] In this antenna device, the radius of the radome to be housed is adjusted in accordance with the length L of the antenna substrate so that the two dipole antennas with corner reflectors (reflectors) do not come into contact with each other including the feed circuit. I'm making it big.

FIG. 6 is a view showing another example of a conventional antenna device. A printed dipole antenna with two corner reflectors (reflectors) in one radome having a structure in which a feed terminal is arranged in front of a reflector. Is shown in the case of an antenna device that accommodates. In the figure, 1 is a radome, 21 and
22 is an antenna substrate, 31 and 32 are feeding terminals, 41 and 4
2 is an excitation element, 51 and 52 are corner reflectors (reflectors), and power supply terminals 31 and 32 are corner reflectors 51 and 52.
52 is arranged on the front surface.

[0007]

In the example of the conventional antenna shown in FIG. 5, the feeder terminals 31, 32 are provided behind the corner reflectors 51, 52. There is a problem that a space is required to prevent the radome from coming into contact with the dome, so that the radius of the radome becomes large.

Further, in the method of installing the power supply terminals 31 and 32 shown in FIG. 6 on a substrate in front of the corner reflectors 51 and 52, a space behind the corner reflector is not required, but the work for wiring is difficult. That the power supply terminal affects the radiation directivity, and that the distance between the excitation elements 41 and 42 and the reflection plates 51 and 52 is
There has been a problem that the length cannot be shorter than the length from the tip of the antenna substrate 21 to the antenna substrate 22.

SUMMARY OF THE INVENTION The present invention provides an antenna device suitable as a base station antenna which can reduce the size of an antenna and can easily perform wiring work in order to solve the above-mentioned conventional problems. It is an object.

[0010]

According to the present invention, the above-mentioned problems are solved by the means described in the claims.

That is, the present invention relates to an antenna device in which two printed antennas with a corner reflector are arranged adjacent to each other in one radome, wherein the antenna device is located on a bisector of a corner angle of the corner reflector, or on the same. An antenna device in which an excitation element of the printed antenna is disposed in the vicinity, and a substrate of the printed antenna does not exist on a bisector of a corner angle of the corner reflector.

[0012]

FIG. 1 is a diagram showing the basic configuration of the present invention.
The case where a printed dipole antenna is used is shown.

In FIG. 1, 1 is a radome, 21 and 22.
Is an antenna substrate, 31 and 32 are feed terminals, 41 and 42 are excitation elements, 51 and 52 are corner reflectors (reflectors), 61 and 62 are bisectors of corner angles, 71 and
Reference numeral 72 denotes the bisectors 61 and 62 of the corner and the antenna substrate 3
The angle between 1 and 32 is shown.

In the antenna device of the present invention, as shown in FIG. 1, the antenna substrates 21 and 22 are not set on the bisectors of the corners, but the bisectors 61 and 62 and the antenna substrates 31 and 3
2 are set as angles θ1 and θ2 (71, 72).

Thus, in an antenna device in which two printed dipole antennas with corner reflectors (reflectors) are arranged adjacent to each other in one cylindrical radome, the length L of the antenna substrate is reduced by one in the conventional cylindrical radome. And a printed dipole antenna with a corner reflector (reflector) placed on the antenna board while maintaining the same length as the antenna board used for the antenna device. can do. Therefore, it is possible to reduce the radius of the radome.

[0016]

FIG. 2 is a diagram showing a first embodiment of the present invention. In this embodiment, the base station antenna for mobile communication is 120 °.
A printed dipole antenna with a corner reflector having a beam is housed on two sides in one radome. In the figure, 1 is a radome, 21 and 22 are antenna substrates, 31 and 32 are feed terminals, 41 and 42 are excitation elements, 51 and 52 are corner reflectors (reflectors), 6
Reference numerals 1 and 62 denote bisectors of corner angles, and 71 and 72 denote corner bisectors 61 and 62 and antenna substrates 31 and 32.
The angles 81 and 82 are parasitic elements on the antenna substrates 21 and 22.

In this antenna, a current flows through the excitation elements 41 and 42 in a low frequency band, and a current flows through the excitation elements 41 and 42 and the parasitic elements 81 and 82 in a high frequency band.
It operates as a dual-frequency antenna operating in two frequency bands.

When such a printed dipole antenna with a parasitic element is used, the antenna substrates 21 and
The angle between bisectors 61 and 62 of 2 and the angle of the corner is θ1
By setting (71) and θ2 (72), the power supply terminal can be provided on the antenna substrate on the back surface of the reflector, so that the radius of the radome can be reduced.
In the present invention, when a current flows through the parasitic elements 81 and 82, the deviation of the parasitic elements 81 and 82 from the bisectors 61 and 62 of the corner angles affects the shape of the radiation pattern. .

However, in a dual-frequency antenna that resonates in two frequency bands by bringing the parasitic element close to the antenna, the distance between the parasitic element and the excitation element is 0.1λ or less. 82 and excitation element 4
The interval between 1, 42 is small. Therefore, the parasitic elements 81, 8
The deviation of the angle of the second corner from the bisectors 61 and 62 is also small, and the influence on the radiation pattern is small.

FIG. 3 is a view showing a second embodiment of the present invention, and shows an antenna device in which a printed dipole antenna having a corner reflector and a parasitic element are housed in two surfaces in one radome. In the figure, 1 is a radome, 2
Reference numerals 1 and 22 denote antenna substrates, 31 and 32 denote power supply terminals, 4
Reference numerals 1 and 42 denote excitation elements, 51 and 52 denote corner reflectors (reflecting plates), 61 and 62 denote bisectors of corner angles,
Reference numerals 71 and 72 denote corners formed by the bisectors 61 and 62 of the corners and the antenna substrates 31 and 32, and reference numerals 91 and 92 denote parasitic elements. The parasitic elements 91 and 92 are arranged on the bisectors of the corners of the corners, away from the antenna substrates 21 and 22.

Although this antenna operates as a dual-frequency antenna, the parasitic element does not require a feed terminal or feed line. Therefore, as described in the first embodiment, the parasitic element can be installed separately from the antenna substrates 21 and 22.

According to the present invention, the parasitic element is connected to the antenna substrate 2.
1 and 22 and the antenna board 21,
By displacing 22 from the bisectors 61 and 62 of the corner angles, even if the feed terminals 31 and 32 are installed on the antenna substrate behind the corner reflectors 51 and 52, wiring is easy, and It is possible to configure an antenna device having a small radome radius.

In the present antenna, since the excitation elements 41 and 42 and the parasitic elements 91 and 92 are both on the bisectors 61 and 62 of the corner angles, they have no influence on the directivity. .

FIG. 4 shows a third embodiment of the present invention, in which a printed dipole antenna having a dual-frequency corner reflector in which two elements excited at each frequency are coupled on a printed board by a feed line, Fig. 3 shows an antenna device that accommodates two feed elements in one radome.

In the figure, 1 is a radome, 21 and 22 are antenna substrates, 31 and 32 are feed terminals, 41 and 42 are excitation elements, 51 and 52 are corner reflectors (reflectors), 6
Reference numerals 1 and 62 denote bisectors of corner angles, and 71 and 72 denote corner bisectors 61 and 62 and antenna substrates 31 and 32.
, 101 and 121, 102 and 122 are elements coupled by feed lines that excite at two different frequencies, respectively, elements 101 and 102, elements 41 and 42 are elements that are excited at the same frequency, 111 And 112 represent feed lines on the printed circuit boards 21 and 22.

Also in the case of this embodiment, the antenna substrates 21 and 22
Is shifted from the bisectors 61 and 62 of the corner angles, it is possible to reduce the radius of the radome as in the case of the above-described antenna.

[0027]

As described above, according to the present invention,
The radius of the cylindrical radome that houses the printed dipole antenna with two corner reflectors (reflectors) can be reduced without changing the length of the antenna board, and the antenna board can be long enough behind. Therefore, since the position of the power supply terminal can be set on the antenna substrate on the back of the corner reflector, there is an advantage that the wiring operation can be facilitated.

By designing a two-sided storage base station antenna having a small radome radius by using the present invention, it is possible to reduce the size and weight of the base station antenna and to reduce the number of base station antennas to be installed. Becomes

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of the present invention.

FIG. 2 is a diagram showing a first embodiment of the present invention.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a third embodiment of the present invention.

FIG. 5 is a diagram illustrating an example of a conventional antenna device.

FIG. 6 is a diagram showing another example of a conventional antenna device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Radome 21, 22 Substrate of printed dipole antenna 31, 32 Feeding terminal of printed dipole antenna 41, 42 Exciting element of printed dipole antenna 51, 52 Corner reflector (reflector) 61, 62 Bisection line of corner angle 71 , 72 Angles formed by bisectors 61, 62 at the corners and antenna substrates 31, 32 81, 82 Parasitic elements of dipole antenna (on the same substrate) 91, 92 Parasitic elements 101, 102, 121, 122 of dipole antenna Elements 111 and 112 connected by feed line Feed line

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01Q 15/18 H01Q 19/10

Claims (1)

(57) [Claims] 1. An antenna device in which two printed antennas with corner reflectors are arranged adjacent to each other in one radome, wherein:
Alternatively, an excitation device for the printed antenna is arranged in the vicinity of the antenna, and the substrate of the printed antenna is configured not to be on a bisector of a corner angle of the corner reflector. .