JP2820874B2 - Quad ridge horn antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quad ridge horn antenna, and more particularly to a quad ridge horn antenna capable of correcting a radiation amplitude pattern distortion.

[0002]

2. Description of the Related Art A quad ridge horn antenna is shown in FIG.
As shown in FIG. 0, it is constituted by a quad ridge waveguide 1, which is a rectangular waveguide, a double ridge waveguide (coaxial-waveguide converter) 2, and an input coaxial connector 3. In this quad ridge horn antenna, microwaves are fed from the input coaxial connector 3. The fed microwave is converted by the double ridge waveguide 2 and then converted into the quad ridge waveguide 1.
And radiated from the opening of the quad ridge waveguide 1 as radio waves. The double ridge waveguide 2 is connected to the quad ridge waveguide 1 at an inclination of 45 degrees.

[0003]

The following points are not considered in the above-mentioned quad ridge horn antenna.

In the conversion section from the double ridge waveguide 2 to the quad ridge waveguide 1, the microwave mode conversion is not sufficiently performed, and the quad ridge waveguide 2 remains in the state where the mode of the double ridge waveguide 2 remains. A microwave is transmitted to the tube 1. For this reason, the radiation amplitude pattern of the radio wave radiated from the opening of the quad ridge waveguide 1 has an inclination of about 45 degrees corresponding to the inclination angle of the connection of the double ridge waveguide 2 (inclined in the double ridge direction). ). That is, distortion occurs in the radiation amplitude pattern (amplitude distribution having a slope occurs, or distortion occurs at a high elevation angle).

An object of the present invention is to solve such a problem. In a quad ridge horn antenna, the radiation amplitude pattern is vertically and horizontally and symmetrically with the antenna front (boresight direction) as a vertex. It is an object of the present invention to prevent occurrence of distortion of the radiation amplitude pattern.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a double ridge waveguide is inclinedly connected to a quad ridge waveguide which is a rectangular waveguide. In the quad ridge horn antenna, a dielectric lens is provided at an opening of the quad ridge waveguide, at a position where the radiation amplitude pattern is vertically and horizontally symmetrical.

According to a second aspect of the present invention, in the quad ridge horn antenna according to the first aspect, the dielectric constant is gradually increased from the opening of the quad ridge waveguide toward the outside of the opening. It is characterized by having a dielectric lens.

According to a third aspect of the invention, in the quad ridge horn antenna according to the second aspect, the cross-sectional area gradually increases from the opening of the quad ridge waveguide toward the outside of the opening. It is characterized by comprising a dielectric lens made of one kind of material having a specific permittivity of a tapered shape.

According to a fourth aspect of the present invention, in the quad ridge horn antenna according to the second aspect, the dielectric constants differ from each other from the opening of the quad ridge waveguide toward the outside of the opening. And a dielectric lens formed by stacking a plurality of types of materials having the following.

According to a fifth aspect of the present invention, in the quad ridge horn antenna according to the second aspect, the slit width gradually decreases from the opening of the quad ridge waveguide toward the outside of the opening. It is characterized by including a dielectric lens made of a material having a specific permittivity in which a plurality of slits are arranged.

According to a sixth aspect of the present invention, in the quad ridge horn antenna according to the second aspect, the material density is different from the opening of the quad ridge waveguide toward the outside of the opening. It is characterized by comprising a dielectric lens formed by stacking a plurality of types of materials.

According to a seventh aspect of the present invention, in the quad ridge horn antenna according to the second aspect, the material density gradually increases from the opening of the quad ridge waveguide toward the outside of the opening. A dielectric lens made of a material having a specific dielectric constant;

[0013]

In the quad ridge horn antenna according to any one of the claimed inventions, the dielectric lens is provided in a region where the power density is low due to the inclination of the double ridge waveguide.
In the vicinity of the opening of the quad ridge waveguide, the electric field distribution is corrected by the dielectric lens, and the electric field distribution is made uniform, so that the radiation amplitude pattern is corrected. That is, the upper and lower sides and the left and right sides of the radiation amplitude pattern are symmetrical with the front of the antenna as the vertex, so that the occurrence of pattern distortion can be prevented.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 shows a configuration of a quad ridge horn antenna according to the first to third aspects of the present invention. FIG. 2 shows the quad ridge horn antenna A
3A shows the front, FIG. 3B shows the left side, and FIG. 3C shows the top.

The quad ridge horn antenna includes a quad ridge waveguide 1 which is a rectangular waveguide, a double ridge waveguide (coaxial-waveguide converter) 2, an input coaxial connector 3, and a dielectric lens 4. You. The double ridge waveguide 2 is connected to the quad ridge waveguide 1 at an inclination of 45 degrees.

The dielectric lens 4 is located at the opening of the quad ridge waveguide 1 at a position where the radiation amplitude pattern (Az pattern) is vertically and horizontally symmetrical with the front of the antenna (boresight direction) as the vertex. It is attached. That is, as shown in FIG. 5, the conversion mode generated according to the connection angle of the double ridge waveguide 2 is corrected by the dielectric lens 4, and a radiation amplitude pattern symmetric in the Az direction and symmetric in the EL direction is obtained. Can be On the other hand, the conventional radiation amplitude pattern has a double ridge waveguide 2 as shown in FIG.
It shows a spread with an inclination according to the connection angle of.

The specific mounting position of the dielectric lens 4 is such that the opposing corners of the opening of the quad ridge waveguide 1 in the direction intersecting the microwave supply direction by the input coaxial connector 3 when viewed from the front of the antenna. Department. The dielectric lens 4 is formed of a material having a higher dielectric constant than the free space, and the dielectric constant is set to gradually increase from the opening of the quad ridge waveguide 1 toward the outside of the opening. In this embodiment, the dielectric lens 4 is formed in a shape obtained by diagonally cutting off a semi-cylindrical dielectric material. That is, the dielectric lens 4 is formed in a tapered shape whose cross-sectional area gradually increases from the opening of the quad ridge waveguide 1 toward the outside of the opening.

In the quad ridge horn antenna configured as described above, the microwave transmitted from the input coaxial connector 3 to the double ridge waveguide 2 and the quad ridge waveguide 1 transmits the opening of the quad ridge waveguide 1. At the stage of being radiated as radio waves from, the radiation amplitude pattern is modified as shown in FIG. That is, since the dielectric lens 4 is attached to the area where the power density has been reduced,
The electric field is gradually drawn in the direction in which the dielectric lens 4 is attached, and the electric field distribution is made uniform. Therefore, as described above, a radiation amplitude pattern having a shape symmetrical in the vertical and horizontal directions when viewed from the front of the antenna is obtained, and distortion generated in the radiation amplitude pattern is eliminated.

Embodiment 2 FIG. FIG. 6 shows the configuration of the quad ridge horn antenna according to the fourth aspect of the present invention. FIG.
(A) Front view of quad ridge horn antenna, Fig. 6
6B shows a left side surface, and FIG. 6C shows a top surface.

In the quad ridge horn antenna shown in FIG. 6, a dielectric lens 4 in which a plurality of (three in this embodiment) dielectric materials 4A, 4B and 4C having different dielectric constants are stacked is used. Is done. As described above, the dielectric material 4C has a higher relative dielectric constant than the free space, the dielectric material 4B has a higher dielectric constant than the dielectric material 4C, and the dielectric material 4B has a higher dielectric constant than the dielectric material 4B.
The dielectric constant of A is set high. That is, the dielectric lens 4 is formed by sequentially stacking a plurality of types of dielectric materials 4C, 4B, and 4A having different relative dielectric constants from the opening of the quad ridge waveguide 1 toward the outside of the opening. Be composed.

In the quad ridge horn antenna thus configured, the same effects as those of the first embodiment can be obtained, and the shape of the dielectric lens 4 can be simplified.

Embodiment 3 FIG. FIG. 7 shows the configuration of the quad ridge horn antenna according to the fifth aspect of the present invention. FIG.
(A) Front view of quad ridge horn antenna, Fig. 7
7B shows a left side surface, and FIG. 7C shows an upper surface.

In the quad ridge horn antenna shown in FIG. 7, a dielectric lens 4 in which a plurality (three in this embodiment) of slits 4D, 4E and 4F are formed in one kind of dielectric material is used. As described above, the dielectric material has a higher relative permittivity than the free space, and the slits 4D, 4D
The slit widths of E and 4F are sequentially formed larger.
That is, in the dielectric lens 4, the slit width dimension is sequentially reduced from the opening of the quad ridge waveguide 1 to the outside of the opening, and the relative permittivity per predetermined volume is set to be sequentially higher.

In the quad ridge horn antenna thus configured, the same effects as those of the first embodiment can be obtained, and the slits 4D, 4E and 4F of the dielectric lens 4 can be obtained.
Can be processed relatively easily.

Embodiment 4 FIG. FIG. 8A shows a configuration of a quad ridge horn antenna according to the invention according to claim 6,
FIG. 8B shows a detailed configuration of the dielectric lens.

In the quad ridge horn antenna shown in FIG. 8, a dielectric lens 4 in which a plurality of (three in this embodiment) dielectric materials 4I, 4G and 4H having different dielectric constants are stacked is used. Is done. The plurality of types of dielectric materials 4I, 4G and 4H are basically formed of the same dielectric material, but have different material densities. The dielectric material 4I is provided with a large number of holes (or large holes), the dielectric material 4G is provided with a smaller number of holes (or small holes) than the dielectric material 4I, and the dielectric material 4H is provided with holes. Not been. That is, the dielectric lens 4
Is a dielectric material 4 whose relative dielectric constant increases sequentially from the opening of the quad ridge waveguide 1 toward the outside of the opening.
It is configured by stacking I, 4G and 4H. If the above conditions are satisfied, a plurality of types of dielectric materials 4I, 4G
And 4H may each be formed of separate dielectric materials.

In the quad ridge horn antenna configured as described above, the same effect as in the second embodiment can be obtained.

Embodiment 5 FIG. FIG. 9A shows a configuration of a quad ridge horn antenna according to the invention of claim 7,
FIG. 9B shows a detailed configuration of the dielectric lens 4.

In the quad ridge horn antenna shown in FIG. 9, a dielectric lens 4 in which a plurality of types of holes (three types of holes in this embodiment) 4J, 4K and 4L are formed in one type of dielectric material is used. Is done. The holes 4J increase the relative permittivity per unit volume of the dielectric lens 4, and the relative permittivity is adjusted by the number or size of the holes 4J. Similarly,
The hole 4K lowers the dielectric constant per unit volume of the dielectric lens 4 as compared with the hole 4J, and the hole 4L further lowers the dielectric constant per unit volume of the dielectric lens 4 than the hole 4K. That is, in the dielectric lens 4, the material density gradually increases from the opening of the quad ridge waveguide 1 toward the outside of the opening, and the relative permittivity per predetermined volume gradually increases.

In the quad ridge horn antenna configured as described above, the same effect as in the first embodiment can be obtained.

As described above, in the quad ridge horn antenna, the dielectric lens 4 is provided in a region where the power density caused by the inclination of the double ridge waveguide 2 is low.
In the vicinity of the opening of the quad ridge waveguide 1, the electric field distribution is corrected by the dielectric lens 4, and the electric field distribution is made uniform, so that the radiation amplitude pattern is corrected.
That is, the upper and lower sides and the left and right sides of the radiation amplitude pattern are symmetrical with the front of the antenna as the vertex, so that the occurrence of pattern distortion can be prevented.

The present invention is not limited to the above embodiment, but can be variously modified without departing from the scope of the invention.

[0034]

As described above, according to the present invention,
In the quad ridge horn antenna, the radiation amplitude pattern can be vertically and horizontally symmetrical with the front face of the antenna as a vertex, so that distortion of the radiation amplitude pattern can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a quad ridge horn antenna according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the quad ridge horn antenna taken along line AA.

3A is a front view of the quad ridge horn antenna, FIG. 3B is a left side view, and FIG. 3C is a top view.

FIGS. 4A to 4D are diagrams showing conventional radiation amplitude patterns.

FIGS. 5A to 5D are diagrams showing radiation amplitude patterns according to the present invention.

6A is a front view of a quad ridge horn antenna according to a second embodiment of the present invention, FIG. 6B is a left side view, and FIG.
Is a top view.

7A is a front view of a quad ridge horn antenna according to a third embodiment of the present invention, FIG. 7B is a left side view, and FIG.
Is a top view.

8A is a front view of a quad ridge horn antenna according to a fourth embodiment of the present invention, and FIG. 8B is a configuration diagram of a dielectric lens.

FIG. 9A is a front view of a quad ridge horn antenna according to a fifth embodiment of the present invention, and FIG. 9B is a configuration diagram of a dielectric lens.

FIG. 10 is a perspective view of a conventional quad ridge horn antenna.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Quad ridge waveguide 2 Double ridge waveguide 3 Input coaxial connector 4 Dielectric lens 4A-4C, 4I-4H Dielectric material 4D-4F Slit 4J-4L Hole

Claims (7)

(57) [Claims] 1. A quad ridge horn antenna in which a double ridge waveguide is inclined and connected to a quad ridge waveguide that is a rectangular waveguide, wherein the radiation amplitude is an opening of the quad ridge waveguide. A quad ridge horn antenna comprising a dielectric lens at a position where the pattern is vertically and horizontally symmetrical. 2. The quad ridge horn antenna according to claim 1, wherein the dielectric lens has a permittivity gradually increased from an opening of the quad ridge waveguide toward an outside of the opening. A quad ridge horn antenna characterized in that: 3. The quad ridge horn antenna according to claim 2, wherein the dielectric lens gradually increases in cross-sectional area from the opening of the quad ridge waveguide to the outside of the opening. A quad ridge horn antenna comprising a taper-shaped material having a specific dielectric constant. 4. The quad ridge horn antenna according to claim 2, wherein the dielectric lens has different dielectric constants from the opening of the quad ridge waveguide to the outside of the opening. A quad ridge horn antenna comprising a plurality of types of materials stacked. 5. The quad ridge horn antenna according to claim 2, wherein the dielectric lens gradually decreases in slit width from an opening of the quad ridge waveguide toward an outside of the opening. A quad ridge horn antenna comprising a material having a specific permittivity in which a plurality of slits are arranged. 6. The quad ridge horn antenna according to claim 2, wherein the dielectric lenses have different material densities from the opening of the quad ridge waveguide to the outside of the opening. A quad ridge horn antenna comprising a plurality of types of materials stacked. 7. The quad ridge horn antenna according to claim 2, wherein a material density of the dielectric lens gradually increases from an opening of the quad ridge waveguide toward an outside of the opening. A quad ridge horn antenna comprising a material having a specific dielectric constant.