JPH0227611Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a primary horn of an antenna used as a primary radiator of a consumer parabolic antenna that receives radio waves from broadcasting satellites.

[Conventional technology]

In a conventional general primary horn, as shown in FIG. 2, a flange-shaped cylindrical portion 2 is integrally connected to the front end of a cylindrical portion 1 constituting a waveguide. However, this primary horn has a large amount of leakage power and has poor directivity characteristics. Therefore, as shown in FIG. 3, it is known to form a yoke 13 consisting of a concave groove on the front end surface of the flange-shaped cylindrical portion 2 to reduce leakage power.

[Problem that the invention attempts to solve]

When designing a parabolic antenna like the one mentioned above,
In order to find the optimal primary irradiation distribution, it is necessary to measure the characteristics of various primary horns with different aperture angles.In this case, in the conventional primary horn shown in FIG. It is necessary to provide a In addition, it is necessary to repeatedly replace the primary horn, install it, and measure its characteristics.Moreover, since measurements are being taken outdoors, even if the horn is replaced frequently, it must be constructed to prevent rainwater from entering, making the replacement work troublesome. There was a problem. The present invention solves the above-mentioned problems and provides a primary horn that is easy to process, easy to replace, and has low leakage power, making it easy to select the optimal primary horn when designing a parabolic antenna. The purpose of this invention is to make it easy to adapt to various types of primary radiators.

[Means to solve the problem]

The primary horn of the antenna according to the present invention has a female thread formed on the inner periphery of the cylindrical part, a step formed on the inner periphery of the lug-shaped cylindrical part following this cylindrical part, and an outer shell member with a larger inner diameter on the open side than this step. , a horn member having a thread formed on the outer periphery of the proximal end of the cylindrical portion and a flange protruding from the outer periphery of the lug-shaped cylindrical portion following the cylindrical portion,
The male thread of this horn member is removably screwed into the female thread of the outer shell member, so that the cylindrical portion of the outer shell member and the cylindrical portion of the horn member are continuous with the same inner diameter, and the flange of the horn member is connected to the outer shell member. A yoke is formed on the opening side of the flange.

[Effect]

Since the primary horn of the antenna according to the present invention is configured as described above, multiple horn members with different opening angles can be replaced and attached to the outer shell member, making it easy to select the optimal horn. This reduces the man-hours required to design and develop a parabolic antenna, and the combination of the step of the outer shell member and the flange of the horn member, as well as the screws between the outer shell member and the horn member, allows the horn member to be replaced even when the horn member is replaced. Mutual positional relationship with the outer shell member, electrical connection, and proper chioke value can always be obtained, and by replacing the horn member, one type of outer shell member can be used for a plurality of reflectors.

【Example】

Hereinafter, one embodiment of the present invention will be described with reference to FIG. As shown in Fig. 1, the primary horn of this embodiment is
It includes an outer shell member 3 and a horn member 4. In the outer shell member 3, a female thread 6 is formed on the inner periphery of the tip of the cylindrical portion 5, and a step 8 is formed in the flange-shaped cylindrical portion 7 that continues to the tip of the cylindrical portion 5, and the tip side of the step 8 has a larger inner diameter. Further, the inner diameter of the portion between the female thread 6 and the step 8 is also made slightly larger than that of the female thread 6. In the horn member 4, a thread 10 is formed on the outer periphery of the base end of the cylindrical portion 9, and a flange 12 is formed on the outer periphery of a flange-shaped cylindrical portion 11 that is continuous with the tip of the cylindrical portion 9. The male thread 10 of the horn member 4 is removably screwed into the female thread 6 of the outer shell member 3, and the cylindrical portion 9 of the horn member 4 is connected to the proximal end side of the female thread 6 of the cylindrical portion 5 of the outer shell member 3. are coaxial and continuous with the same inner diameter, and the flange 12 of the horn member 4
is brought into contact with the step 8 of the outer shell member 3, and a groove-like groove 13 is formed on the opening side of the flange 12.
Note that the yoke 13 is for 12 GHz and is formed to have a width of 2 mm or more and a depth of about 8 mm. Also, the outer shell member 3
The cylindrical portion 5 constitutes a waveguide together with the cylindrical portion 9 of the horn member 4, and a converter (not shown) is provided at the base end thereof, as in a normal primary horn. Since the primary horn according to this embodiment is constructed as described above, it is possible to replace and attach a plurality of types of horn members 4 with different opening angles to the same outer shell member 3, and which horn Even if the member 4 is used, the flange 12 of the horn member 4 is connected to the outer shell member 3.
By bringing the horn member 4 into contact with the step 8, the horn member 4 and the outer shell member 3 can be electrically connected, and a concave groove-shaped chi yoke 13 of the required size is formed to obtain an appropriate chi yoke effect, thereby preventing leakage. Electric power can be reduced.

[Effect of the idea]

As explained above, according to the present invention, the primary horn is composed of two members, the outer shell member and the horn member, and the horn member is removably screwed onto the inner peripheral side of the outer shell member, and The flange provided on the outer periphery of the horn member is brought into contact with the step provided on the inner periphery of the outer shell member, and a chi yoke is formed at the open ends of the outer shell member and the horn member, so it is easy to use when designing a parabolic antenna. Multiple horn members with different opening angles etc. can be mounted efficiently, making it easy to select the optimal horn.Also, by using different horn members for the same type of outer shell member, multiple types of horn members can be installed. It can be easily adapted to the primary radiator, and furthermore, even if the horn member is replaced, an appropriate chioke value can always be obtained, and leakage power can be reduced.

[Brief explanation of the drawing]

FIG. 1 shows an antenna according to an embodiment of the present invention.
Fig. 2 is a longitudinal sectional view of the main part showing the primary horn; Fig. 2 is a longitudinal sectional view of the front end showing an example of a conventional primary horn;
The figure is a longitudinal cross-sectional view of the front end of the same example. DESCRIPTION OF SYMBOLS 1...Cylindrical part, 2...Rump-like cylinder part, 3...Outer shell member, 4...Horn member, 5...Cylindrical part, 6...
...Female thread, 7...Rump-shaped cylindrical portion, 8...Step, 9...
...Cylindrical part, 10...Male thread, 11...Rump-shaped cylindrical part, 12...Flange, 13...Choice yoke.

Claims (1)

[Scope of utility model registration request] A female thread is formed on the inner periphery of the cylindrical part, a step is formed on the inner periphery of the lug-shaped cylindrical part following this cylindrical part, and an outer shell member with a larger inner diameter on the opening side from this step and an outer periphery of the proximal end of the cylindrical part are formed. A horn member is provided with a thread formed therein and a flange protruding from the outer periphery of the flange-shaped cylindrical part following the cylindrical part, and the male thread of the horn member is removably screwed into the female thread of the outer shell member. An antenna characterized in that the cylindrical part of the member and the cylindrical part of the horn member are continuous to have the same inner diameter, the flange of the horn member is brought into contact with the step of the outer shell member, and a chi yoke is formed on the opening side of the flange. Primary horn.