JPH0435507A - Circularly polarized wave antenna device - Google Patents

Abstract

PURPOSE:To realize a low loss of a connecting line, and also, to simplify the constitution by constituting a circularly polarized wave excitation circuit and the connecting line on the same plane by a square coaxial line, and connecting directly an excitation probe to an inner conductor of the square coaxial line and constituting it on a plane. CONSTITUTION:A circularly polarized wave excitation circuit 4 and a connecting line 5 are constituted on one place by a square coaxial line constituted of a square inner conductor having desired line width and thickness, and a square outer conductor having desired height and width, and excitation probes 3a, 3b are connected directly to the inner conductor of the square coaxial line and constituted on a plane. In such a state, a signal inputted by an input terminal 6 is distributed to two by the circularly polarized wave excitation circuit 4, and also, a phase difference of 90 degrees is given. The signals distributed to two are inputted to the excitation probes 3a, 3b through connecting lines 5a, 5b constituted of the square coaxial line, respectively. In such a way, a low loss of the connecting line is realized, and also, by curtailing the number of parts, the constitution can be simplified.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides excitation probes that are installed at two or four locations at 90 degree intervals around the axis of the waveguide tube so as to be perpendicular to the axis of the waveguide tube. The present invention relates to a circularly polarized antenna device that excites circularly polarized waves with a desired amplitude and phase in a circularly polarized wave excitation circuit.

[Conventional technology]

FIGS. S and 6 are diagrams showing a conventional circularly polarized antenna device, with FIG. 5 being a front view and FIG. aS being a side sectional view.

In the figure, ill is a radio wave radiating element such as a conical horn antenna for radiating radio waves to one point.

(2+ is the above-mentioned radiation element (11'i circular waveguide for excitation).

C) is an excitation probe installed perpendicularly to the axis of the waveguide telegraph tube at two locations 90 degrees apart from the tube axis rotation υ. and a circularly polarized wave excitation circuit that excites in phase, !511d The above excitation probe +31 and the above circularly polarized wave excitation circuit (4) and f, a connecting line to be connected, (61 is the input terminal 2 (7) is the above circular waveguide (9) is the short circuit plate, and (9) is the connection connector.

Next, the operation will be explained. The conventional circularly polarized antenna device is configured as described above, and the signal inputted from the input terminal (6) is divided into two parts by the circularly polarized wave excitation circuit ((conversion)).
And a phase difference of sg degrees is provided. The two divided signals are connected to respective connectors (9a2).

Connection lines (5a), (5b) and connection connector (9a1) made up of coaxial cables, etc. from (9'b2)
, (91), ) via the excitation probe (3a), (
3b).

By making the connection lines (5a) and (5b) the same electrical length, signals having equal amplitude and a phase difference of 90 degrees are input to the excitation 10-pins (5a) and (31)). Therefore, the 8 circular waveguide (2) has an excitation probe (3a), (,
5t)) υ circularly polarized waves are excited. Here, the circular waveguide (2) is short-circuited by the shorting plate (7) so that the signal is excited by the excitation probe (3).The input signal is transmitted through the circular waveguide ( When a radio wave radiating element (1) such as a conical horn connected to ml iC is excited, it is radiated into space as a radio wave having circularly polarized waves.In the above case, when a circularly polarized antenna device is used as a transmitting antenna. Although the operation of the antenna has been described, it has the same characteristics when used as a receiving antenna.

[Problem to be solved by the invention]

Since the conventional circularly polarized antenna device is configured as described above, there are problems in that the loss of the connecting line (5) and the connecting connector 1910 is large, and the configuration is complicated due to the large number of parts.

This Q invention was made in order to solve the above-mentioned problems, and to obtain a circularly polarized antenna device with a simplified configuration by reducing the loss of the connection line and reducing the number of parts. With the goal.

[Means to solve the problem]

In the circularly polarized antenna device according to the present invention, the circularly polarized wave excitation circuit and the connecting line INr are constructed of a rectangular inner conductor having a desired line width and thickness and a rectangular outer conductor having a desired height and width. Constructed on one plane with rectangular coaxial line, excitation 10
・By directly connecting the inner conductor of the rectangular coaxial line O to the inner conductor of the rectangular coaxial line O, the thickness of the inner conductor and excitation probe of the rectangular coaxial line that is configured on the plane υ and that constitutes the 1 circularly polarized excitation circuit and the connection line can be kept constant. In addition, when the radio wave radiating elements are arranged in an array, the beam forming circuit for exciting each radio wave radiating element with the desired amplitude and phase is also rectangular and coaxial on the same plane as the circularly polarized wave excitation circuit. It is composed of railway lines.

[Effect]

This circularly polarized antenna device has a circularly polarized wave excitation circuit and a connecting line configured on one plane by a rectangular coaxial line, and an excitation probe configured on the plane by directly connecting to the inner conductor of the rectangular coaxial line. The inner conductor of the rectangular coaxial line constituting the circularly polarized wave excitation circuit and the excitation loop are integrally molded with constant thickness.

In addition, when the radio wave radiating elements are arranged in an array, the beam forming circuit is also configured with a rectangular coaxial line on the same plane as the circularly polarized wave excitation circuit, which eliminates the need for a connecting connector and reduces the loss of the connecting line. The configuration is simplified by reducing the number of parts.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a front view of the Q circularly polarized antenna device according to the claims (11 and (2)) of the present invention, Fig. 2 is a side cross-sectional view thereof, and Fig. 3 is the claim (11 and (2)). (3)
FIG. 2 is a front view of the circularly polarized antenna device.

In the figure, (1) is a radio wave radiating element such as a conical horn antenna for radiating radio waves into space, (2) is the radio wave radiating element (III - a circular waveguide connected for excitation,
(3) is the waveguide (2) at 90 degree intervals on the tube axis opening.
(4) is a circularly polarized wave excitation circuit for exciting the excitation probe (3) with a desired amplitude and phase; (
5) is the above excitation probe (3) and the above circularly polarized wave excitation circuit (
4) is the connection line that connects, (6) is the input terminal, (7)
is a shorting plate for shorting the circular waveguide (2), (6
) is a beam forming circuit for exciting the radio wave radiating elements (1) arranged in an array with a desired amplitude and phase.Next, the operation will be explained. The circularly polarized antenna device according to the present invention is shown in Figure 1 and above! It is configured as shown in Figure 2, and the signal input from the input terminal (6) is transmitted through a rectangular inner conductor having a desired line width and thickness and a rectangular outer conductor having a desired height and width. A circularly polarized wave excitation circuit consisting of a rectangular coaxial line is divided into two parts, and a phase difference of 90 degrees is provided.

The two divided signals are input to the excitation probes (3a) and (3b) via connecting lines (sa)t (51)) each constituted by a rectangular coaxial line. Since the excitation probe (3) is directly connected to the inner conductor of the rectangular coaxial line, there is no need for a connector like in conventional circularly polarized antenna devices. Further, by using a rectangular coaxial line for the connection line, it is possible to reduce the loss. By making the connection lines (sa) and t(sb) have the same electrical length, signals having equal amplitude and a phase difference of 90 degrees are input to the excitation probes (3a) and (5b).

Therefore, one circular waveguide (2) has an excitation probe (sa) +
(3b) Circularly polarized waves are excited, and the circular waveguide (2
Radio waves having circular polarization are radiated between a radio wave radiating element (11) such as a conical horn connected to the radio wave radiating element (11).

Additionally, the thickness of the inner conductor of the rectangular coaxial line constituting the circularly polarized wave excitation circuit (4) and the connection line (5) and the thickness of the excitation probe (3) are made constant and integrally molded, thereby simplifying the configuration. becomes possible.

Further, as shown in FIG. 3, when a plurality of the above-mentioned circularly polarized antennas are arranged in an array, a beam forming circuit 8) constituted by a rectangular coaxial line is provided.

By connecting the output terminal of the beam forming circuit (8) to each circularly polarized antenna Q circularly polarized wave excitation circuit (4) via a connection line (5), each circularly polarized antenna is excited with a desired amplitude and phase. be able to. Even in the case of array arrangement, one circularly polarized wave excitation circuit (4), connection line (5), beam forming circuit (8)
) and excitation 10-wave without using a connector.
It can be constructed from rectangular coaxial lines on the same plane.

Incidentally, in the above description, the operation when a circularly polarized antenna device is used as a transmitting antenna has been described.

It has the same characteristics when used as a receiving antenna.

In the above embodiment, the excitation probe is provided within the tomoe-shaped waveguide, but the same effect can be obtained even if the excitation probe is provided within the rectangular waveguide. In addition, in the above embodiment, two excitation probes were provided in the circular waveguide at an interval of sO degrees, but as shown in FIG.
4 pieces are provided at degree intervals.

For example, each excitation probe (3a) to (3d) is
．． Circularly polarized wave excitation circuit (4a) to excite with two equal amplitudes with a phase relationship of every 90 degrees such as 90,1110.270 degrees
The same operation can be obtained by connecting (4C).

〔Effect of the invention〕

As described above, according to the present invention, the 9 circularly polarized wave excitation circuit and the connection line are configured on the same plane by the rectangular coaxial line, and the excitation probe is directly connected to the inner conductor of the rectangular coaxial line. It is constructed on the above plane.

In addition, even when the inner conductor is integrally molded with a constant thickness and the radio wave radiating elements are arranged in an array, the beam forming circuit can be configured with a rectangular coaxial line on the above plane, thereby eliminating the need for a connecting connector. By reducing the loss of the connection line and reducing the number of parts (see Figure 9), it is possible to obtain a circularly polarized antenna device with a simplified configuration.

[Brief explanation of drawings]

1 and 2 are a front view and a side view of a circularly polarized antenna device according to an embodiment of the present invention, and FIG. 3 is a front view and a side view of a circularly polarized antenna device according to another embodiment of the present invention. FIG. 4 is a front view of a circularly polarized antenna device according to still another embodiment of the second invention, and FIGS. 5 and 6 are a front view and a side view of a conventional circularly polarized antenna device. In the figure, (1) is a radio wave radiating element, L2) is a circular waveguide, (3) is an excitation probe, (4) is a circularly polarized wave excitation circuit, C5) is a connection line, (
6) is an input terminal, (7) is a shorting plate, (8) is a beam forming circuit, and (9) is a connection connector. Note that in the two figures, the same reference numerals indicate the same or equivalent parts.

Claims (3)

[Claims] (1) A radio wave radiating element, a circular or rectangular waveguide connected to the radio wave radiating element, and a 90° radius around the axis of the waveguide.
an excitation probe provided perpendicularly to the waveguide axis at two or four locations at degree intervals; a circularly polarized wave excitation circuit that excites the excitation probe with a desired amplitude and phase; In a circularly polarized antenna device comprising a connection line connecting a circularly polarized wave excitation circuit, the circularly polarized wave excitation circuit and the connection line are connected to a rectangular inner conductor having a desired line width and thickness and a desired height. The rectangular coaxial line is configured on one plane by a rectangular outer conductor having a length and width, and the excitation probe is configured on the plane by directly connecting to the inner conductor of the rectangular coaxial line. circularly polarized antenna device. (2) A radio wave radiating element, a circular or rectangular waveguide connected to the radio wave radiating element, and a 90°
an excitation probe provided perpendicularly to the waveguide axis at two or four locations at degree intervals; a circularly polarized wave excitation circuit that excites the excitation probe with a desired amplitude and phase; In a circularly polarized antenna device comprising a connection line connecting a circularly polarized wave excitation circuit, the circularly polarized wave excitation circuit and the connection line are connected to a rectangular inner conductor having a desired line width and thickness and a desired height. A rectangular coaxial line composed of a rectangular outer conductor having a height and a width is configured on one plane, the thickness of the inner conductor of the rectangular coaxial line and the thickness of the excitation probe are constant, and the excitation probe is connected to the inner conductor. A circularly polarized antenna device characterized by being integrally molded with. (3) To excite the plurality of radio wave radiating elements arranged in an array, the waveguide, the circularly polarized wave excitation circuit, the connecting line, the excitation probe, and each of the radio wave radiating elements at a desired amplitude and phase. In a circularly polarized antenna device consisting of a beam forming circuit connected to the above circularly polarized excitation circuit,
The circularly polarized wave excitation circuit, the beam forming circuit, and the connection line are configured on one plane by the rectangular coaxial line, and the excitation probe is configured on the plane by directly connecting to the inner conductor of the rectangular coaxial line. A circularly polarized antenna device characterized by: