JP7269019B2 - receiving antenna - Google Patents

Description

The present invention relates to a receiving antenna technology for satellite broadcasting, and more particularly to a receiving antenna and a receiving antenna shielding plate for reducing unwanted electromagnetic interference waves by a structure.

As is well known, in satellite broadcasting, radio waves transmitted from a satellite on a geostationary orbit are received by a reception antenna for satellite broadcasting, and the broadcast is viewed on a satellite broadcasting receiver. The type of receiving antenna for satellite broadcasting is generally a parabolic type, which is classified into a center feed type and an offset type.

7(a) and 7(b) are a perspective view and a cross-sectional view, respectively, showing a schematic configuration of a conventional center-feed type receiving antenna 10A for satellite broadcasting. The receiving antenna 10A shown in FIG. The feed horn 11 is supported by an arm 13 as shown in FIG. 7A, for example, so that the radio wave receiving portion 11a is positioned. Normally, the feed horn 11 has a low-noise block converter (LNB) 11b arranged after the radio wave receiving portion 11a that receives the radio waves reflected by the reflector 12, and the radio wave receiving portion 11a and the LNB 11b are built in the same housing. . Therefore, it is assumed here that the feed horn 11 also incorporates the LNB 11b.

As shown in FIG. 7(b), the reflecting surface 12a of the reflecting mirror 12 has a curved surface shape (opening with an effective curved surface area Ar surface). The feed horn 11 is positioned on the center axis of the reflecting mirror 12, and its radio wave receiving portion 11a is arranged at the focal point FP of the hyperboloid of revolution on the reflecting surface 12a. The reflective surface 12a is often made of metal such as aluminum or reinforced plastic (FRP) bonded with a metal mesh.

In the receiving antenna 10A shown in FIG. 7, radio waves arriving from, for example, a broadcasting satellite 101 are reflected by the reflecting surface 12a of the reflecting mirror 12, received by the radio wave receiving section 11a of the feed horn 11, and converted into electrical signals. This electrical signal is amplified and frequency-converted by the LNB 11b and generally output to the satellite broadcast receiver via a coaxial cable 11c connected by an F-type connector at the LNB 11b.

8A and 8B are a perspective view and a cross-sectional view, respectively, showing a schematic configuration of a conventional offset-type receiving antenna 10B for satellite broadcasting. In FIG. 8, the same reference numerals are given to the same components as in FIG. The receiving antenna 10B shown in FIG. 8 is composed of a feed horn 11 and a reflector 12, and is arranged so that the radio wave receiving portion 11a of the feed horn 11 is positioned at the focal point FP on the central axis OO' of the paraboloid of revolution CL. Further, the feed horn 11 is supported by an arm 13 as shown in FIG. 8(a), for example. The reception antenna 10B shown in FIG. 8 will be described assuming that the feed horn 11 also incorporates an LNB 11b, like the center feed type reception antenna 10A shown in FIG.

As shown in FIG. 8(a), the reflecting surface 12a of the reflecting mirror 12 has a curved surface shape (opening with an effective curved surface area Ar surface). In the receiving antenna 10B shown in FIG. 8, radio waves coming from, for example, a broadcasting satellite 101 are reflected by the reflecting surface 12a of the reflecting mirror 12, received by the radio wave receiving section 11a of the feed horn 11, and converted into electrical signals. This electrical signal is amplified and frequency-converted by the LNB 11b and generally output to the satellite broadcast receiver via a coaxial cable 11c connected by an F-type connector at the LNB 11b.

7 and 8, the radio waves reflected at any position on the reflecting surface 12a of the reflector 12 are converged on the radio wave receiving portion 11a of the feed horn 11 arranged at the focal point FP. Therefore, high antenna gain can be obtained.

FIG. 9 shows the directional characteristics of a conventional satellite broadcast receiving antenna 10A (or 10B) (relative gain with respect to an aperture angle where the angle from the axis center of the reflecting surface 12a of the reflecting mirror 12 toward the feed horn 11 is 0°). It is a figure which shows an example. In the example shown in FIG. 9, while the gain is high in the range of ±several degrees from 0° of the axis center, there is a relative gain of −30 dB or less in the surrounding area. This is because the radio wave arriving after being diffracted by the peripheral portion of the reflecting mirror 12 and the radio wave arriving directly at the feed horn 11 are also received. Therefore, even if an interfering wave arrives from a direction other than the direction of the satellite, reception of satellite broadcasting may be hindered depending on the magnitude of the interfering wave.

By the way, the standard CISPR11 of IEC (International Electrotechnical Commission) defines the allowable electric field intensity of unnecessary radiation for ISM (industrial, scientific, and medical) equipment including microwave ovens. In Japan, frequencies of 11.7 GHz to 12.7 GHz are used for satellite broadcasting. This frequency overlaps with the fifth harmonic 12.25 GHz ± 250 MHz (12.0 GHz to 12.5 GHz) of the frequency 2.45 GHz ± 50 MHz used in microwave ovens. As a result, it may interfere with the reception of satellite broadcasting. In particular, it has been reported that receiving antennas for 4K/8K satellite broadcasting, which are currently under development, may be subject to reception interference due to external noise caused by such microwave ovens (see, for example, Non-Patent Document 1). .

For example, when a satellite broadcast reception antenna is installed on the veranda of a small apartment, if a nearby microwave oven radiates a strong 5th harmonic, it will be received at the same time as the satellite broadcast signal from the back of the reception antenna. Therefore, it becomes a cause of reception interference.

As an effective method for suppressing external noise when receiving radio waves coming from a satellite, there is, for example, a method of installing a structure for shielding radio waves around the receiving antenna (see, for example, Patent Document 1).

In addition, although it is not a receiving antenna for satellite broadcasting, a primary radiator that radiates radio waves generated by a radio device or feeds radio waves received from a radio device to a radio device, and a parabolic reflector that reflects the radio waves are unnecessary. Equipped with a shroud (shielding plate) for shielding radiated radio waves or unwanted reception radio waves, the top of the shroud (shielding plate) is attached and fixed to the top of the parabolic reflector so as to cover both the parabolic reflector and the primary radiator, and the shroud An antenna device is disclosed that uses a (shielding plate) to fix and support a primary radiator (see Patent Document 2, for example).

JP-A-2005-86528 International Publication No. 2013/168319

T. Shimazaki, A. Hashimoto, “Influence of Eliminating Peak Limit in CISPR11 on Satellite Broadcasting”, IEEE Xplore Digital Library, Registered on August 16, 2018, [Searched on October 22, 2018], Internet <https: //ieeexplore.ieee.org/document/8436916〉

As mentioned above, it is assumed that the receiving antenna for 4K/8K satellite broadcasting currently under development may be subject to reception interference due to external noise caused by such microwave ovens. A technique that suppresses extraneous noise when

As a technique for suppressing such external noise, it is conceivable to install a structure for shielding radio waves around the receiving antenna as disclosed in Patent Document 1.

However, the technique disclosed in Patent Document 1 employs a configuration in which several square meters around the receiving antenna are surrounded by a structure. Have difficulty.

Also, for the technique disclosed in Patent Document 2, the top of a shroud (shielding plate) is attached and fixed to the top of the parabolic reflector so as to cover both the parabolic reflector and the primary radiator, and the shroud (shielding plate) is attached to the top of the parabolic reflector. Since the primary radiator is fixedly supported by using is desired, and the technique disclosed in Patent Document 2 is not suitable for applying to a receiving antenna for satellite broadcasting.

SUMMARY OF THE INVENTION An object of the present invention is to provide a receiving antenna for satellite broadcasting and a shielding plate for the receiving antenna which are capable of suppressing external noise and have a simple structure suitable for home use.

A receiving antenna of the present invention is a receiving antenna for satellite broadcasting, comprising a reflecting mirror for reflecting incoming radio waves to a focal point, and a reflecting mirror disposed at the focal point for receiving the reflected waves of the radio waves reflected by the reflecting mirror. and a receiving antenna shielding plate for suppressing external noise with respect to the reflected wave. a tubular body having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or a trumpet tubular body having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height while increasing in diameter; The receiving antenna shielding plate has an attachment mechanism that can be attached to and detached from the attachment object, and the attachment mechanism has a function of adjusting an attachment angle with respect to the attachment object.

Further, the receiving antenna of the present invention is a receiving antenna for satellite broadcasting, comprising: a reflecting mirror for reflecting incoming radio waves to a focal point; a feed horn for converting a wave into an electric signal; and a receiving antenna shielding plate for suppressing external noise with respect to the reflected wave. It is composed of a trumpet tubular body having a peripheral wall extending while expanding its diameter from the peripheral edge of the tip to a predetermined height , and the shielding plate for the receiving antenna has a mounting mechanism that can be attached to and detached from the mounting target, The attachment mechanism is characterized by having a function of adjusting an attachment angle with respect to the attachment target .

Further, the receiving antenna of the present invention is a receiving antenna for satellite broadcasting, comprising: a reflecting mirror for reflecting incoming radio waves to a focal point; a feed horn for converting a wave into an electric signal; and a pair of receiving antenna shielding plates for suppressing external noise from the reflected wave, wherein one of the pair of receiving antenna shielding plates is connected to the reflector. A tubular body to be attached, having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height while increasing in diameter. The other of the pair of shielding plates for the receiving antenna is formed of a trumpet tubular body, and the other of the pair of shielding plates for the receiving antenna is attached to the feed horn, and has a peripheral wall that extends from the peripheral edge of the tip of the feed horn to a predetermined height while increasing in diameter. The receiving antenna shielding plate has a mounting mechanism that is detachable from the mounting object, and the mounting mechanism has a function of adjusting the mounting angle with respect to the mounting object characterized by

Further, a receiving antenna of the present invention is a receiving antenna for satellite broadcasting, comprising: a reflecting mirror for reflecting incoming radio waves to a focal point; a feed horn for converting a wave into an electric signal; and a receiving antenna shielding plate for suppressing external noise from the reflected wave. A tubular body having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or a trumpet tubular body having a peripheral wall extending from the peripheral edge of the reflector to a predetermined height while increasing in diameter The receiving antenna shielding plate has a telescopic mechanism for adjusting the height thereof .

Further, a receiving antenna of the present invention is a receiving antenna for satellite broadcasting, comprising: a reflecting mirror for reflecting incoming radio waves to a focal point; a feed horn for converting a wave into an electric signal; and a receiving antenna shielding plate for suppressing external noise with respect to the reflected wave. It is composed of a trumpet tubular body having a peripheral wall that extends from the peripheral edge of the tip to a predetermined height while expanding the diameter, and the shielding plate for the receiving antenna has an expansion mechanism that can adjust the height. and

Further, a receiving antenna of the present invention is a receiving antenna for satellite broadcasting, comprising: a reflecting mirror for reflecting incoming radio waves to a focal point; a feed horn for converting a wave into an electric signal; and a pair of receiving antenna shielding plates for suppressing external noise from the reflected wave, wherein one of the pair of receiving antenna shielding plates is connected to the reflector. A tubular body to be attached, having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height while increasing in diameter. The other of the pair of shielding plates for the receiving antenna is formed of a trumpet tubular body, and the other of the pair of shielding plates for the receiving antenna is attached to the feed horn, and has a peripheral wall that extends from the peripheral edge of the tip of the feed horn to a predetermined height while increasing in diameter. and the receiving antenna shielding plate has a telescopic mechanism for adjusting the height thereof.

Further, a receiving antenna of the present invention is a receiving antenna for satellite broadcasting, comprising: a reflecting mirror for reflecting incoming radio waves to a focal point; a feed horn for converting a wave into an electric signal; and a receiving antenna shielding plate for suppressing external noise from the reflected wave. A tubular body having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or a trumpet tubular body having a peripheral wall extending from the peripheral edge of the reflector to a predetermined height while increasing in diameter , the peripheral wall of the shielding plate for the receiving antenna is formed by partially overlapping a plurality of peripheral wall materials that can change the opening angle, or is formed by connecting a plurality of peripheral wall materials that can adjust the height. It is characterized by being composed of

Further, a receiving antenna of the present invention is a receiving antenna for satellite broadcasting, comprising: a reflecting mirror for reflecting incoming radio waves to a focal point; a feed horn for converting a wave into an electric signal; and a receiving antenna shielding plate for suppressing external noise with respect to the reflected wave. It is composed of a trumpet tubular body having a peripheral wall extending while expanding its diameter from the tip peripheral edge of the receiving antenna shielding plate to a predetermined height, and the peripheral wall in the receiving antenna shielding plate is made of a plurality of peripheral wall materials that can change the opening angle. It is characterized by being constructed by partially overlapping or by connecting a plurality of peripheral wall materials that make the height adjustable.

Further, a receiving antenna of the present invention is a receiving antenna for satellite broadcasting, comprising: a reflecting mirror for reflecting incoming radio waves to a focal point; a feed horn for converting a wave into an electric signal; and a pair of receiving antenna shielding plates for suppressing external noise from the reflected wave, wherein one of the pair of receiving antenna shielding plates is connected to the reflector. A tubular body to be attached, having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height while increasing in diameter. The other of the pair of shielding plates for the receiving antenna is formed of a trumpet tubular body, and the other of the pair of shielding plates for the receiving antenna is attached to the feed horn, and has a peripheral wall that extends from the peripheral edge of the tip of the feed horn to a predetermined height while increasing in diameter. The peripheral wall of the receiving antenna shielding plate is configured by partially overlapping a plurality of peripheral wall materials that allow the opening angle to be changed, or the height is adjustable It is characterized in that it is configured by connecting a plurality of peripheral wall materials .

It is possible to configure a receiving antenna for satellite broadcasting that is capable of suppressing external noise and has a simple structure suitable for home use.

1(a) and 1(b) are a perspective view and a cross-sectional view, respectively, showing a schematic configuration of a center-feed-type receiving antenna for satellite broadcasting having a receiving antenna shielding plate according to a first embodiment of the present invention. 1(a) and 1(b) are a perspective view and a cross-sectional view, respectively, showing a schematic configuration of an offset-type receiving antenna for satellite broadcasting having a receiving antenna shielding plate according to a second embodiment of the present invention. 10A and 10B are a perspective view and a cross-sectional view, respectively, showing a schematic configuration of a center-feed satellite broadcast receiving antenna having a receiving antenna shielding plate according to a third embodiment of the present invention; FIG. 10(a) and 10(b) are a perspective view and a cross-sectional view, respectively, showing a schematic configuration of an offset-type receiving antenna for satellite broadcasting having a receiving antenna shielding plate according to a fourth embodiment of the present invention. 3(a) to 3(c) are perspective views showing a schematic configuration of a mounting mechanism of a mounting portion of each example of the receiving antenna shielding plate of the first to fourth embodiments according to the present invention, respectively. FIG. 1(a) to 1(c) are perspective views showing a schematic configuration of an expansion/contraction mechanism of a peripheral wall of each embodiment of a receiving antenna shielding plate according to first to fourth embodiments of the present invention, respectively. (a) and (b) are a perspective view and a cross-sectional view, respectively, showing a schematic configuration of a conventional center-feed type receiving antenna 10A for satellite broadcasting. (a) and (b) are a perspective view and a cross-sectional view, respectively, showing a schematic configuration of a conventional offset-type receiving antenna 10B for satellite broadcasting. FIG. 2 is a diagram showing an example of directivity characteristics of a conventional receiving antenna 10A (or 10B) for satellite broadcasting;

A receiving antenna for satellite broadcasting having a receiving antenna shielding plate according to each embodiment will be described below with reference to the drawings. In addition, the same reference numerals are assigned to the same components in each drawing for explanation.

[First Embodiment]
1(a) and 1(b) are a perspective view and a cross-sectional view, respectively, showing a schematic configuration of a center-feed satellite broadcast receiving antenna 1A having a receiving antenna shielding plate 20 according to a first embodiment of the present invention. be.

The receiving antenna 1A according to the first embodiment shown in FIG. 1 is a center-feed receiving antenna for satellite broadcasting that receives radio waves from a broadcasting satellite 101, like the receiving antenna 10A shown in FIG.

As shown in FIG. 1, the receiving antenna 1A according to the first embodiment is the same as the receiving antenna 10A shown in FIG. 7 in that it includes a feed horn 11 and a reflector 12, and further description thereof will be omitted. However, it differs in that it further includes a receiving antenna shielding plate 20 attached to the reflecting mirror 12 .

The receiving antenna shielding plate 20 according to the present embodiment is made of a material that shields radio waves, and is a cylindrical body having a peripheral wall 20c that extends from the peripheral edge 12b of the reflector 12 to a height h with the same diameter. be. The opening distal end portion 20a of the receiving antenna shielding plate 20 according to the present embodiment is opened with the same diameter (diameter Dr) as the opening proximal end portion 20b, and the opening proximal end portion 20b is located at the peripheral edge portion 12b of the reflector 12. It has a mounting portion 20d that is detachably fixed to the mounting portion 20d (an embodiment of the mounting mechanism that constitutes the mounting portion 20d will be described later). Here, the height h is the height hf from the peripheral edge portion 12b of the reflector 12 to the focal point FP of the radio wave receiving portion 11a in the feed horn 11 (in the direction parallel to the central axis OO' of the paraboloid of revolution CL). height), and preferably the height does not exceed the entire radio wave receiving section 11a as shown in the figure. This makes it possible to efficiently shield unnecessary radio waves in a small size.

The receiving antenna shielding plate 20 may be made of any material that shields radio waves, such as a metal plate, a metal mesh bonded to a synthetic resin material, a mixture of metal powders, or a conductive rubber material. . The shape of the receiving antenna shielding plate 20 of this example is a shape that does not shield the electric field from which the radio waves arriving from the broadcasting satellite 101 reach the reflecting surface 12a of the reflecting mirror 12, and is substantially the same as the peripheral edge portion 12b of the reflecting mirror 12. It is a cylindrical body having a peripheral wall 20c extending with the same diameter from an open proximal end portion 20b to an open distal end portion 20a.

In this manner, a reception antenna 1A for center-feed satellite broadcasting, which is capable of suppressing external noise and has a simple structure suitable for home use, is constructed. In particular, the shape of the receiving antenna shielding plate 20 according to this embodiment can be made smaller than the technique disclosed in Patent Document 2, and furthermore, it is detachable from the reflecting mirror 12 and can be attached or detached as appropriate. can be used, the degree of freedom in installing the receiving antenna, which can be assumed in various installation positions, is improved, and the convenience is also enhanced.

[Second embodiment]
2(a) and 2(b) are a perspective view and a cross-sectional view, respectively, showing a schematic configuration of an offset-type receiving antenna 1B for satellite broadcasting having a receiving antenna shielding plate 20 according to a second embodiment of the present invention. .

A reception antenna 1B according to the second embodiment shown in FIG. 2 is an offset-type reception antenna for satellite broadcasting that receives radio waves from a broadcasting satellite 101, like the reception antenna 10B shown in FIG.

As shown in FIG. 2, the receiving antenna 1B according to the second embodiment is the same as the receiving antenna 10B shown in FIG. 8 in that it includes a feed horn 11 and a reflector 12, and further description thereof will be omitted. However, it differs in that it includes a receiving antenna shielding plate 20 attached to the reflecting mirror 12 .

The receiving antenna shielding plate 20 according to the present embodiment is made of a material that shields radio waves, and is a trumpet tubular body having a peripheral wall 20c that extends from the peripheral edge 12b of the reflector 12 to a height h while increasing in diameter. Configured. The opening distal end portion 20a of the reception antenna shielding plate 20 according to the present embodiment is opened with a diameter larger than that of the opening proximal end portion 20b (diameter Dr). It has a mounting portion 20d that is detachably fixed to the portion 12b (an embodiment of the mounting mechanism that constitutes the mounting portion 20d will be described later). Here, the height h is the height hf from the peripheral edge portion 12b of the reflector 12 to the focal point FP of the radio wave receiving portion 11a in the feed horn 11 (the height of the reflector 12 relative to the central axis OO' of the paraboloid of revolution CL). (height in the direction parallel to the line segment NV forming the inclination angle θ), and preferably does not exceed the entire radio wave receiving portion 11a as shown in the figure. As a result, the receiving antenna shielding plate 20 is small and can efficiently shield unnecessary radio waves.

The receiving antenna shielding plate 20 may be made of any material that shields radio waves, such as a metal plate, a metal mesh bonded to a synthetic resin material, a mixture of metal powders, or a conductive rubber material. . The shape of the receiving antenna shielding plate 20 of this example is such that the radio waves arriving from the broadcasting satellite 101 are reflected by the reflecting surface 12a of the reflecting mirror 12 and do not block the route to the feed horn 11. It is a trumpet tubular body having a peripheral wall 20c extending from an opening proximal end portion 20b having substantially the same shape as the peripheral edge portion 12b to an opening distal end portion 20a with an enlarged diameter.

In this manner, an offset-type receiving antenna 1B for satellite broadcasting, which is capable of suppressing external noise and has a simple structure suitable for home use, is constructed. In particular, the shape of the receiving antenna shielding plate 20 according to this embodiment can be made smaller than the technique disclosed in Patent Document 2, and furthermore, it is detachable from the reflecting mirror 12 and can be attached or detached as appropriate. can be used, the degree of freedom in installing the receiving antenna, which can be assumed in various installation positions, is improved, and the convenience is also enhanced.

[Third Embodiment]
3(a) and 3(b) are a perspective view and a cross-sectional view, respectively, showing the schematic configuration of a center-feed satellite broadcast receiving antenna 2A having a receiving antenna shielding plate 20 according to a third embodiment of the present invention. be.

A receiving antenna 2A according to the third embodiment shown in FIG. 3 is a center-feed receiving antenna for satellite broadcasting that receives radio waves from a broadcasting satellite 101, like the receiving antenna 10A shown in FIG.

As shown in FIG. 3, a receiving antenna 2A according to the third embodiment is the same as the receiving antenna 10A shown in FIG. 7 in that it includes a feed horn 11 and a reflector 12, and further description thereof will be omitted. However, it is different in that a receiving antenna shielding plate 20 attached to the feed horn 11 is provided.

The receiving antenna shielding plate 20 according to the present embodiment is made of a material that shields radio waves, and is a trumpet tubular body having a peripheral wall 20c that extends from the radio wave receiving portion 11a of the feed horn 11 to a height h while increasing in diameter. consists of The opening distal end portion 20a of the reception antenna shielding plate 20 according to the present embodiment is opened with a larger diameter than the diameter of the opening proximal end portion 20b (the diameter of the radio wave receiving portion 11a). The horn 11 has a mounting portion 20d that is detachably fixed to the periphery of the tip of the radio wave receiving portion 11a (an embodiment of the mounting mechanism that constitutes the mounting portion 20d will be described later). Here, the height h is the ratio of the shielding curved surface area As on the reflecting surface 12a shielded by the opening diameter Ds of the opening tip portion 20a to the effective curved surface area Ar of the reflecting surface 12a in the reflecting mirror 12. As/Ar It is preferable to set it to be <20%. This makes it possible to efficiently shield unnecessary radio waves in a small size.

The receiving antenna shielding plate 20 may be made of any material that shields radio waves, such as a metal plate, a metal mesh bonded to a synthetic resin material, a mixture of metal powders, or a conductive rubber material. . The shape of the receiving antenna shielding plate 20 of this example is such that the reflected wave of the radio wave arriving from the broadcasting satellite 101 reflected by the reflecting surface 12a of the reflecting mirror 12 does not block the path leading to the feed horn 11. 11 has a peripheral wall 20c extending from an opening proximal end 20b to an opening distal end 20a having substantially the same shape as the radio wave receiving portion 11a of 11, and is a trumpet cylindrical body that does not block the path of the reflected wave.

In this manner, a reception antenna 2A for center-feed satellite broadcasting, which is capable of suppressing external noise and has a simple structure suitable for home use, is constructed. In particular, the shape of the receiving antenna shielding plate 20 according to this embodiment can be made smaller than the technique disclosed in Patent Document 2, and furthermore, it is detachable from the reflecting mirror 12 and can be attached or detached as appropriate. can be used, the degree of freedom in installing the receiving antenna, which can be assumed in various installation positions, is improved, and the convenience is also enhanced.

[Fourth Embodiment]
4(a) and 4(b) are a perspective view and a cross-sectional view, respectively, showing a schematic configuration of an offset-type receiving antenna 2B for satellite broadcasting having a receiving antenna shielding plate 20 according to a fourth embodiment of the present invention. .

A reception antenna 2B according to the fourth embodiment shown in FIG. 4 is an offset-type reception antenna for satellite broadcasting that receives radio waves from a broadcasting satellite 101, like the reception antenna 10B shown in FIG.

As shown in FIG. 4, the receiving antenna 2B according to the fourth embodiment is the same as the receiving antenna 10B shown in FIG. 8 in that it includes a feed horn 11 and a reflector 12, and further description thereof will be omitted. However, it is different in that a receiving antenna shielding plate 20 attached to the feed horn 11 is provided.

The receiving antenna shielding plate 20 according to the present embodiment is made of a material that shields radio waves, and is a trumpet tubular body having a peripheral wall 20c that extends from the radio wave receiving portion 11a of the feed horn 11 to a height h while increasing in diameter. consists of The opening distal end portion 20a of the reception antenna shielding plate 20 according to the present embodiment is opened with a larger diameter than the diameter of the opening proximal end portion 20b (the diameter of the radio wave receiving portion 11a). The horn 11 has a mounting portion 20d that is detachably fixed to the periphery of the tip of the radio wave receiving portion 11a (an embodiment of the mounting mechanism that constitutes the mounting portion 20d will be described later). Here, the height h is preferably set to a height that does not block the paths of the radio waves arriving from the broadcasting satellite 101 and the reflected waves reflected by the reflecting surface 12a of the reflecting mirror 12. FIG. This makes it possible to efficiently shield unnecessary radio waves in a small size.

The receiving antenna shielding plate 20 may be made of any material that shields radio waves, such as a metal plate, a metal mesh bonded to a synthetic resin material, a mixture of metal powders, or a conductive rubber material. . The shape of the receiving antenna shielding plate 20 of this example is such that the radio wave arriving from the broadcasting satellite 101 and the reflected wave reflected by the reflecting surface 12a of the reflecting mirror 12 do not block the path leading to the feed horn 11. A trumpet cylindrical body that has a peripheral wall 20c that expands in diameter from an opening base end portion 20b to an opening tip portion 20a that has substantially the same shape as the radio wave receiving portion 11a of the horn 11, and that does not block the paths of the incoming radio waves and the reflected waves. and

In this manner, an offset-type receiving antenna 2B for satellite broadcasting, which is capable of suppressing external noise and has a simple structure suitable for home use, is constructed. In particular, the shape of the receiving antenna shielding plate 20 according to this embodiment can be made smaller than the technique disclosed in Patent Document 2, and furthermore, it is detachable from the reflecting mirror 12 and can be attached or detached as appropriate. can be used, the degree of freedom in installing the receiving antenna, which can be assumed in various installation positions, is improved, and the convenience is also enhanced.

For the examples of the respective embodiments described above, an embodiment combining the first embodiment and the third embodiment or an embodiment combining the second embodiment and the fourth embodiment achieves higher external noise suppression. Embodiments may also be constructed to advantage.

(Mounting Mechanism of Mounting Portion 20d of Shielding Plate 20 for Receiving Antenna)
FIGS. 5(a) to 5(c) are perspective views showing the schematic configuration of the mounting mechanism of the mounting portion 20d of each example in the receiving antenna shielding plate 20 of the first to fourth embodiments according to the present invention, respectively. FIG. 5 shows an example of attaching the receiving antenna shielding plate 20 to the radio wave receiving portion 11a of the feed horn 11 as the receiving antennas 2A and 2B according to the third and fourth embodiments. As the receiving antennas 1A and 1B according to the first and second embodiments, the case where the receiving antenna shielding plate 20 is attached to the peripheral edge portion 12b of the reflecting mirror 12 can be configured in the same manner, so the description thereof will be omitted.

First, it is assumed that the receiving antenna shielding plate 20 shown in FIG. 5(a) is formed of a conductive rubber material capable of shielding radio waves. The mounting portion 20d of the receiving antenna shielding plate 20 shown in FIG. 5(a) can be expanded in diameter by elastic deformation from an initial state of diameter r, and the radio wave receiving portion 11a having a diameter R (>r) can be expanded. In contrast, the diameter is expanded so that it can be fitted. As a result, the opening proximal end portion 20b of the receiving antenna shielding plate 20 can be fixed in substantially the same shape as the radio wave receiving portion 11a of the feed horn 11 . Since the mounting portion 20d itself of the receiving antenna shielding plate 20, which is formed of a conductive rubber material, has flexibility so that it can be fixed to the radio wave receiving portion 11a having various diameters R, It becomes highly versatile. Further, since the mounting portion 20d of the receiving antenna shielding plate 20 can be mounted at an arbitrary angle α from the axial direction of the radio wave receiving portion 11a with respect to the radio wave receiving portion 11a having various diameters R, the mounting angle There is an advantage that the angle adjustment of is also easy. In other words, it is assumed that aligning the receiving antenna shielding plate 20 with the axial direction of the feed horn 11 does not always provide the best shielding effect against the noise direction to be shielded. Therefore, in the configuration of this example, the mounting portion 20d itself of the receiving antenna shielding plate 20 has flexibility, so that the direction of the receiving antenna shielding plate 20 can be freely adjusted by the mounting method. The same applies to the case where the receiving antenna shielding plate 20 made of a conductive rubber material is attached to the peripheral portion 12b of the reflecting mirror 12. As shown in FIG.

Next, it is assumed that the receiving antenna shielding plate 20 shown in FIG. 5B is formed of a metal plate or metal-containing synthetic resin or the like that has a radio wave shielding effect. A mounting portion 20d of the receiving antenna shielding plate 20 shown in FIG. 5(b) is provided with a ring-shaped tightening member 20e made of rubber material or the like having a diameter r (<R') on the inner peripheral portion having a diameter R'. It is The mounting portion 20d of the receiving antenna shielding plate 20 can be fitted to the radio wave receiving portion 11a having a diameter R (R'>R>r) by a tightening member 20e. As a result, the opening proximal end portion 20b of the receiving antenna shielding plate 20 can be fixed in substantially the same shape as the radio wave receiving portion 11a of the feed horn 11 . Further, since the fastening member 20e having thickness and flexibility can be fixed to the radio wave receiving portion 11a having various diameters R, the versatility of the fastening member 20e is high. Further, since the mounting portion 20d of the receiving antenna shielding plate 20 can be mounted at an arbitrary angle α from the axial direction of the radio wave receiving portion 11a with respect to the radio wave receiving portion 11a having various diameters R, the mounting angle There is an advantage that the angle adjustment of is also easy. In other words, it is assumed that aligning the receiving antenna shielding plate 20 with the axial direction of the feed horn 11 does not always provide the best shielding effect against the noise direction to be shielded. Therefore, in the configuration of this example, the mounting portion 20d itself of the receiving antenna shielding plate 20 has thickness and flexibility so that the direction of the receiving antenna shielding plate 20 can be freely adjusted depending on the mounting method. there is This is also the case when the receiving antenna shielding plate 20 having the fastening member 20e is attached to the peripheral portion 12b of the reflecting mirror 12. As shown in FIG.

Next, the receiving antenna shielding plate 20 shown in FIG. 5(c) includes peripheral wall materials 20c-1, 20c-2, . -N (N is an integer equal to or greater than 2) are partially overlapped in the axial circumferential direction of the radio wave receiving portion 11a. The mounting portion 20d of the receiving antenna shielding plate 20 shown in FIG. 5(c) is formed by superimposing the base ends of the peripheral wall materials 20c-N so as to hold the base ends of the peripheral wall materials 20c-N. An attachment band 20g is wound around. A fitting (not shown) is attached to fix one end of the attachment band 20g and movably engage the other end of the attachment band 20g. The diameter r of the attachment portion 20d can be adjusted by moving the other end of the attachment band 20g relative to the locking fitting.

The mounting portion 20d of the receiving antenna shielding plate 20 shown in FIG. 5(c) can be freely fastened to the radio wave receiving portion 11a having a diameter R. As shown in FIG. As a result, the opening proximal end portion 20b of the receiving antenna shielding plate 20 can be fixed in substantially the same shape as the radio wave receiving portion 11a of the feed horn 11 . The mounting portion 20d formed by overlapping the base ends of the peripheral wall materials 20c-N can be fixed to the radio wave receiving portion 11a having various diameters R, so that the mounting portion 20d has high versatility. becomes. Further, since the mounting portion 20d of the receiving antenna shielding plate 20 can be mounted at an arbitrary angle α from the axial direction of the radio wave receiving portion 11a with respect to the radio wave receiving portion 11a having various diameters R, the mounting angle There is an advantage that the angle adjustment of is also easy. In other words, it is assumed that aligning the receiving antenna shielding plate 20 with the axial direction of the feed horn 11 does not always provide the best shielding effect against the noise direction to be shielded. Therefore, in the configuration of this example, the mounting portion 20d itself of the receiving antenna shielding plate 20 has a variable diameter, so that the orientation of the receiving antenna shielding plate 20 can be freely adjusted depending on the mounting method. Furthermore, as shown in FIG. 5(c), if the receiving antenna shielding plate 20 is configured by overlapping the peripheral wall materials 20c-N, it is possible to adjust the number of layers and to bend the receiving antenna. There is an advantage that the opening angle β of the opening tip portion 20a of the shielding plate 20 can be freely adjusted. This is the same when the receiving antenna shielding plate 20 is attached to the peripheral portion 12b of the reflecting mirror 12. FIG.

5(a) to 5(c), as a typical example of the detachable receiving antenna shielding plate 20, the mounting mechanism of the mounting portion 20d of the representative embodiment has been described. The mounting portion 20d of another embodiment can be formed by appropriately combining the mounting mechanisms of the embodiments shown in c).

(Expansion and contraction mechanism of peripheral wall 20c of receiving antenna shielding plate 20)
FIGS. 6(a) to 6(c) are perspective views showing the schematic structure of the expansion and contraction mechanism of the peripheral wall 20c of each of the receiving antenna shielding plates 20 of the first to fourth embodiments according to the present invention. FIG. 6 shows an example of attaching the receiving antenna shielding plate 20 to the radio wave receiving portion 11a of the feed horn 11 as the receiving antennas 2A and 2B according to the third and fourth embodiments. As the receiving antennas 1A and 1B according to the first and second embodiments, the case where the receiving antenna shielding plate 20 is attached to the peripheral edge portion 12b of the reflecting mirror 12 can be configured in the same manner, so the description thereof will be omitted.

First, it is assumed that the receiving antenna shielding plate 20 shown in FIG. 6(a) is formed of a conductive rubber material that produces a radio wave shielding effect, and is similar to the example shown in FIG. 5(a). , the attachment portion 20d can be detachably attached to the radio wave receiving portion 11a of the feed horn 11. As shown in FIG. Further, the peripheral wall 20c of the receiving antenna shielding plate 20 shown in FIG. (N is an integer equal to or greater than 2) are connected in the axial direction of the radio wave receiving portion 11a, and the height h is flexible. For example, assuming that N=4 peripheral wall materials 20c-1, 20c-2, 20c-3, and 20c-4 are prepared as shown in the figure, when the minimum height hmin is desired as the height h, the mounting Assuming that only the peripheral wall material 20c-1 is attached to the portion 20d and the maximum height hmax is desired as the height h, the peripheral wall materials 20c-1, 20c-2, 20c-3, 20c-4 is assumed to be fully installed. Incidentally, the method of connecting the peripheral wall materials may be by fitting or engagement, or by using double-sided tape, hook-and-loop fasteners, or magnets. In this manner, the receiving antenna shielding plate 20 having the telescopic mechanism shown in FIG. 6(a) can be constructed so that its height h can be extended and retracted.

Next, the receiving antenna shielding plate 20 shown in FIG. 6(b) is a conductive rubber material, a metal plate, or a metal plate that produces a radio wave shielding effect as a modification 1 of the illustration A shown in FIG. 6(a). An example in which annular (in this example, inclined plate ring-shaped) peripheral wall materials 20c-1, 20c-2, . It is based on the assumption that a nested structure is applied. 6(b), representatively, FIG. 6(b-1) is an exploded perspective view of the peripheral wall materials 20c-3 and 20c-4, and FIG. 20c-4 shows a cross-sectional view of the overlap site. The peripheral wall 20c of the receiving antenna shielding plate 20 includes annular (inclined plate ring-shaped in this example) peripheral wall materials 20c-1, 20c-2, and 20c-2 having different diameters, respectively, as shown in FIG. 6(a). , 20c-N (N is an integer equal to or greater than 2) with elastic deformation while superimposed and connected, and the height h is freely stretchable.

In the example shown in FIG. 6(b), for example, on the outer surface side of each overlapped portion of the peripheral wall materials 20c-3 and 20c-4, a plurality of outer elastic connection round protrusions 20h and outer elastic connection recesses 20i are formed. are repeatedly formed a predetermined number of times, and a plurality of inner telescoping connection round projections 20j and inner telescoping connection recesses 20k are repeatedly formed a predetermined number of times on the inner surface side of each overlapped portion. The height h of the peripheral wall materials 20c-3 and 20c-4 can be adjusted by engaging the peripheral wall materials 20c-3 and 20c-4 with elastic deformation of the overlapped portions. For this reason, in the example shown in FIG. 6(b), the connection itself of each peripheral wall material is elastic and separable. In this manner, the receiving antenna shielding plate 20 having the telescoping mechanism shown in FIG.

Next, the receiving antenna shielding plate 20 shown in FIG. 6(c) is made of a conductive rubber material and a bendable thin plate that generate a radio wave shielding effect as a modification 2 of the illustration A shown in FIG. 6(a). An example is assumed in which peripheral wall materials 20c-1, 20c-2, . are doing. The peripheral wall 20c of the reception antenna shielding plate 20 is formed of inclined plate ring-shaped peripheral wall materials 20c-1, 20c-2, . . . , 20c-N ( N is an integer equal to or greater than 2), and the height h is flexible.

In the example shown in FIG. 6(c), for example, each connecting portion of the peripheral wall materials 20c-3 and 20c-4 is fixed with a hook-and-loop fastener or the like, and a flexible stretchable portion 20m is formed. In addition, wires 20n are arranged in appropriate places on the peripheral wall materials 20c-3 and 20c-4 in order to stabilize the expansion and contraction state. The height h of the peripheral wall materials 20c-3 and 20c-4 can be adjusted by bending the connecting portions of the peripheral wall materials 20c-3 and 20c-4. For this reason, in the example shown in FIG. 6(c), the connection itself of each peripheral wall material is elastic and separable. In this manner, the receiving antenna shielding plate 20 having the telescopic mechanism shown in FIG. 6(c) can be constructed so that its height h can be telescopically extended. The expansion mechanism shown in FIG. 6(c) can be applied without connecting a plurality of peripheral wall materials. It can be configured freely.

6(a) to 6(c), as a typical example of the receiving antenna shielding plate 20 that can be expanded/contracted to a height h, the expansion/contraction mechanism of the peripheral wall 20c of the representative embodiment has been described. ) to (c) can be combined appropriately to form a peripheral wall 20c of another embodiment.

Further, the receiving antenna shielding plate 20 in each of the receiving antennas of the embodiments shown in FIGS. 1 to 4 can be an embodiment in which the attachment mechanism illustrated in FIG. 5 and the extension mechanism illustrated in FIG. 6 are appropriately incorporated. .

Although the above-described embodiments and examples have been described as representative examples, it is obvious to those skilled in the art that many variations and substitutions can be made within the spirit and scope of the present invention.

For example, in the examples of the above-described embodiments, the material of the receiving antenna shielding plate 20 is a metal plate, a synthetic resin material laminated with a metal mesh, a mixture of metal powder, a conductive rubber material, or the like. However, it is also possible to use a wire mesh that provides a sufficient shielding effect against the target radio wave wavelength, or a wire mesh or a rubber material that encloses a wire mesh or metal powder. In addition, it is also possible to reduce external noise that is reflected by the receiving antenna shielding plate 20 and jumps in by attaching or applying a radio wave absorbing material to the surface.

In the example of the first embodiment described above, the receiving antenna shielding plate 20 has a peripheral wall extending from the opening proximal end portion 20b having substantially the same shape as the peripheral edge portion 12b of the reflecting mirror 12 to the opening distal end portion 20a with the same diameter. 20c has been described, but as in the second embodiment, the diameter is expanded from the opening proximal end portion 20b having substantially the same shape as the peripheral edge portion 12b of the reflecting mirror 12 to the opening distal end portion 20a. A trumpet tubular body having a peripheral wall 20c extending in a vertical direction may also be used.

In the example of the second embodiment described above, the receiving antenna shielding plate 20 has a peripheral wall 20c that expands in diameter from the opening proximal end portion 20b that has substantially the same shape as the peripheral edge portion 12b of the reflector 12 to the opening distal end portion 20a. , and in particular, the trumpet tubular body configured with a minimum diameter expansion that does not obstruct the path in the direction of arrival of the radio waves arriving from the broadcasting satellite 101 has been illustrated, but a larger opening tip that includes this It is also possible for the portion 20a to be a trumpet-shaped body having a peripheral wall 20c with an enlarged diameter.

In addition, in the examples of the third embodiment and the fourth embodiment described above, the receiving antenna shielding plate 20 has a shape substantially the same as that of the radio wave receiving portion 11a of the feed horn 11, from the opening base portion 20b to the opening tip portion 20a. A trumpet tubular body having a peripheral wall 20c that expands to a diameter that expands to a maximum diameter, and in particular, a trumpet tubular body configured with a minimum diameter expansion that does not block the path of the reflected wave, but a larger opening tip that includes this It is also possible to form a trumpet-shaped body having a peripheral wall 20c where 20a expands in diameter.

In particular, the receiving antenna shielding plate 20 in each of the receiving antennas 1A, 1B, 2A, and 2B according to each embodiment is detachable from the radio wave receiving portion 11a of the reflector 12 or the feed horn 11 rather than being integrated therewith. , and it is preferable to have a configuration in which the device is worn only when external noise becomes a problem.

Accordingly, the present invention should not be construed as limited by the above-described embodiments, but only by the appended claims.

According to the present invention, it is possible to preferably reduce external noise during reception of satellite broadcasting. It is useful for receiving antennas for satellite broadcasting that can eliminate interfering waves according to external noise conditions.

1A, 1B, 2A, 2B Receiving antenna according to the present invention 11 Feed horn 11a Radio wave receiving part in feed horn 10A, 10B Conventional receiving antenna 12 Reflector 20 Shielding plate for receiving antenna 20a Opening tip of shielding plate for receiving antenna 20b Base end of opening of shielding plate for receiving antenna 20c Peripheral wall of shielding plate for receiving antenna 20c-1, 20c-2, . Tightening member at mounting portion of shielding plate for antenna 20f Attachment adjustment portion at mounting portion of shielding plate for receiving antenna 20g Attachment band at mounting portion of shielding plate for receiving antenna 20h Outer surface side of peripheral wall material of shielding plate for receiving antenna Circular projection for telescopic connection 20i Recess for telescopic connection on the outer surface of the peripheral wall material of the shielding plate for the receiving antenna 20j Round projection for telescopic connection on the inner surface of the material for the peripheral wall of the shielding plate for the receiving antenna 20k Of the peripheral wall material for the shielding plate for the receiving antenna Inner expansion/contraction coupling recess 20m Expansion/contraction portion of shielding plate for receiving antenna 20n Wire for expansion/contraction portion of shielding plate for receiving antenna 101 Broadcasting satellite

Claims (9)

A receiving antenna for satellite broadcasting,
a reflecting mirror that reflects incoming radio waves to a focal point;
a feed horn arranged at the focal point for receiving a reflected wave of the radio wave reflected by the reflecting mirror and converting it into an electric signal;
a receiving antenna shielding plate for suppressing external noise for the reflected wave,
The receiving antenna shielding plate is a cylindrical body having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height. Consists of a trumpet tubular body having a peripheral wall extending while expanding its diameter to a height ,
The receiving antenna shielding plate has a mounting mechanism that is detachable from the mounting target,
The receiving antenna, wherein the mounting mechanism has a function of adjusting a mounting angle with respect to the mounting target . A receiving antenna for satellite broadcasting,
a reflecting mirror that reflects incoming radio waves to a focal point;
a feed horn arranged at the focal point for receiving a reflected wave of the radio wave reflected by the reflecting mirror and converting it into an electric signal;
a receiving antenna shielding plate for suppressing external noise for the reflected wave,
The shielding plate for the receiving antenna is attached to the feed horn, and is composed of a trumpet tubular body having a peripheral wall extending from the tip peripheral edge of the feed horn to a predetermined height while expanding the diameter ,
The receiving antenna shielding plate has a mounting mechanism that is detachable from the mounting target,
The receiving antenna, wherein the mounting mechanism has a function of adjusting a mounting angle with respect to the mounting target . A receiving antenna for satellite broadcasting,
a reflecting mirror that reflects incoming radio waves to a focal point;
a feed horn arranged at the focal point for receiving a reflected wave of the radio wave reflected by the reflecting mirror and converting it into an electric signal;
a pair of receiving antenna shielding plates for suppressing external noise for the reflected wave;
One of the pair of receiving antenna shielding plates is a cylindrical body having the reflecting mirror as a mounting object and having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or the reflecting mirror. Consists of a trumpet tubular body having a peripheral wall extending from the peripheral edge to a predetermined height while expanding the diameter,
The other of the pair of receiving antenna shielding plates is mounted on the feed horn, and is composed of a trumpet tubular body having a peripheral wall extending from the edge of the tip of the feed horn to a predetermined height while increasing in diameter. ,
The receiving antenna shielding plate has a mounting mechanism that is detachable from the mounting target,
The receiving antenna, wherein the mounting mechanism has a function of adjusting a mounting angle with respect to the mounting target . A receiving antenna for satellite broadcasting,
a reflecting mirror that reflects incoming radio waves to a focal point;
a feed horn arranged at the focal point for receiving a reflected wave of the radio wave reflected by the reflecting mirror and converting it into an electric signal;
a receiving antenna shielding plate for suppressing external noise for the reflected wave,
The receiving antenna shielding plate is a cylindrical body having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height. Consists of a trumpet tubular body having a peripheral wall extending while expanding its diameter to a height,
The receiving antenna, wherein the shielding plate for the receiving antenna has a telescopic mechanism for adjusting the height thereof . A receiving antenna for satellite broadcasting,
a reflecting mirror that reflects incoming radio waves to a focal point;
a feed horn arranged at the focal point for receiving a reflected wave of the radio wave reflected by the reflecting mirror and converting it into an electric signal;
a receiving antenna shielding plate for suppressing external noise for the reflected wave,
The shielding plate for the receiving antenna is attached to the feed horn, and is composed of a trumpet tubular body having a peripheral wall extending from the tip peripheral edge of the feed horn to a predetermined height while expanding the diameter,
The receiving antenna, wherein the shielding plate for the receiving antenna has a telescopic mechanism for adjusting the height thereof . A receiving antenna for satellite broadcasting,
a reflecting mirror that reflects incoming radio waves to a focal point;
a feed horn arranged at the focal point for receiving a reflected wave of the radio wave reflected by the reflecting mirror and converting it into an electric signal;
a pair of receiving antenna shielding plates for suppressing external noise for the reflected wave;
One of the pair of receiving antenna shielding plates is a cylindrical body having the reflecting mirror as a mounting object and having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or the reflecting mirror. Consists of a trumpet tubular body having a peripheral wall extending from the peripheral edge to a predetermined height while expanding the diameter,
The other of the pair of receiving antenna shielding plates is mounted on the feed horn, and is composed of a trumpet tubular body having a peripheral wall extending from the edge of the tip of the feed horn to a predetermined height while increasing in diameter. ,
The receiving antenna, wherein the shielding plate for the receiving antenna has a telescopic mechanism for adjusting the height thereof. A receiving antenna for satellite broadcasting,
a reflecting mirror that reflects incoming radio waves to a focal point;
a feed horn arranged at the focal point for receiving a reflected wave of the radio wave reflected by the reflecting mirror and converting it into an electric signal;
a receiving antenna shielding plate for suppressing external noise for the reflected wave,
The receiving antenna shielding plate is a cylindrical body having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height. Consists of a trumpet tubular body having a peripheral wall extending while expanding its diameter to a height,
The peripheral wall of the receiving antenna shielding plate is formed by partially overlapping a plurality of peripheral wall materials that can change the opening angle, or by connecting a plurality of peripheral wall materials that can adjust the height. A receiving antenna comprising : A receiving antenna for satellite broadcasting,
a reflecting mirror that reflects incoming radio waves to a focal point;
a feed horn arranged at the focal point for receiving a reflected wave of the radio wave reflected by the reflecting mirror and converting it into an electric signal;
a receiving antenna shielding plate for suppressing external noise for the reflected wave,
The shielding plate for the receiving antenna is attached to the feed horn, and is composed of a trumpet tubular body having a peripheral wall extending from the tip peripheral edge of the feed horn to a predetermined height while expanding the diameter,
The peripheral wall of the receiving antenna shielding plate is formed by partially overlapping a plurality of peripheral wall materials that can change the opening angle, or by connecting a plurality of peripheral wall materials that can adjust the height. A receiving antenna comprising : A receiving antenna for satellite broadcasting,
a reflecting mirror that reflects incoming radio waves to a focal point;
a feed horn arranged at the focal point for receiving a reflected wave of the radio wave reflected by the reflecting mirror and converting it into an electric signal;
a pair of receiving antenna shielding plates for suppressing external noise for the reflected wave;
One of the pair of receiving antenna shielding plates is a cylindrical body having the reflecting mirror as a mounting object and having a peripheral wall extending from the peripheral edge of the reflecting mirror to a predetermined height with the same diameter, or the reflecting mirror. Consists of a trumpet tubular body having a peripheral wall extending from the peripheral edge to a predetermined height while expanding the diameter,
The other of the pair of receiving antenna shielding plates is mounted on the feed horn, and is composed of a trumpet tubular body having a peripheral wall extending from the edge of the tip of the feed horn to a predetermined height while increasing in diameter. ,
The peripheral wall of the receiving antenna shielding plate is formed by partially overlapping a plurality of peripheral wall materials that can change the opening angle, or by connecting a plurality of peripheral wall materials that can adjust the height. A receiving antenna comprising :

Images