JP2003101329A - Structure for signal transmitting-receiving section of antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for signal transmitting-receiving section of antenna system which enables the member corresponding to a cap to be fitted to an opening 2a with high accuracy by means of an appropriate fitting means and can maintain the fitted state of the member as it is for a long period. SOLUTION: This structure is provided with a primary radiator, a converter main body, and a cover which covers the radiator and main body. The cover is constituted by combining in one body a front-side cover element formed by integrally molding a first covering element which covers the front face of the primary radiator, a second covering element which covers the outer peripheral surface of the radiator, a third covering element which covers the front half section of the converter main body, and a sticking section by using a synthetic resin and a rear-side cover element formed by integrally molding a fourth covering element which covers the rear half section of the converter main body and a sticking section by using the synthetic resin.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parabolic antenna, which is connected to a parabolic antenna via a support arm of a transmitting / receiving section so as to maintain a fixed positional relationship with the parabolic antenna. More specifically, the present invention relates to an antenna device having a high-frequency signal transmitting / receiving unit, and more specifically, a primary radiator for receiving or transmitting a signal such as BS, CS, or the like from a parabolic antenna, and an incoming signal from the primary radiator. Alternatively, the present invention relates to a structure of a signal transmission / reception unit in an antenna device including a converter main body for frequency-converting an output signal and a cover for covering the primary radiator and the converter main body. 2. Description of the Related Art FIG. 2 shows an embodiment of the present invention. In these FIGS. 2A and 2B, a trumpet-shaped opening having a wide open end for introducing a radio wave in a primary radiator 2 is shown. The configuration of the (horn) 2a and the introduction portion 2b as a cylindrical hollow circular waveguide is a conventionally known configuration (see, for example, JP-A-8-307102). Therefore, a conventional example will be described with reference to FIG. The main body of the primary radiator in the conventional receiving antenna for receiving radio waves in the 12 GHz band is formed of a material having good conductivity, for example, aluminum die-casting. The main body of the primary radiator is formed in an opening 2a of a horn provided at one end on the radio wave introduction side. On the other hand, in order to prevent dust and rainwater from entering into the introduction portion 2b as a cylindrical hollow circular waveguide from there, a cap having a dustproof and waterproof effect is attached. Such a cap is formed of a material having a low relative dielectric constant (for example, about 2 to 3), having good radio wave permeability, and having high weather resistance and being easily molded, for example, a synthetic resin material such as ABS. . In order to fix the cap to the opening 2a of the horn in the main body, an inward bent portion is provided around the cap, the bent portion is fitted over the outer peripheral edge of the horn, and an adhesive is attached to the joint surface. Is used to adhere water-tightly. The thickness of the front wall of the conventional cap is set so that the loss given to the transmission of a 12 GHz band radio wave (for example, for BS or CS satellite broadcasting) to be received is not more than an allowable value (for example, 0.2 dB).
The cap is formed to have a thickness (about 1 mm) that is equal to or less than one-sixteenth of the wavelength of the radio wave and has a required mechanical strength as a cap. In addition, a resin rod, which is a dielectric for improving the cross polarization discrimination, is provided integrally or additionally at the center of the cap. [0004] In the above configuration, for example, right-handed circularly polarized radio waves arriving from the front of the primary radiator (left side in FIG. 2) in use state pass through the front member of the cap, and are opened. Enter the horn from the section 2a and further into the circular waveguide 2b
And received by the receiving member at the back. When the radio wave passes through the front member of the cap and proceeds from the opening to the horn, the front wall is formed thin as described above,
The loss for radio wave transmission is small. On the other hand, when the right-handed and left-handed circularly-polarized radio waves arrive together from the front,
Since the opening is provided with a dielectric for improving the cross polarization discrimination, those radio waves can be accurately identified,
Depending on the receiving member, a right-handed or left-handed circularly polarized radio wave can be properly received. Therefore, when the cap is attached to the opening as described above, it is possible not only to provide an excellent function in terms of high frequency, but also to expect a dustproof and waterproof effect at the opening. There is an advantage that can be. However, in this conventional mounting structure of the signal receiving portion, since the joining range is small, if the joining state of the cap to the opening 2a is deteriorated due to aging, the unexpected There is a problem that the cap falls off, rainwater infiltrates from the opening 2a, and hinders high-frequency characteristics in the inner part of the circular waveguide 2b. Further, in the conventional method of attaching a cap to the opening 2a, in the process of assembling the signal receiving unit, a small cap is required as an independent component, the number of components is increased, and the management time is increased. There is a problem that the labor for attaching the cap to the opening 2a is increased. Further opening 2
On the other hand, if the accuracy of attaching a small cap is poor, rainwater may enter the inside of the waveguide 2b or the cap may fall off. [0006] The structure of the signal receiving (or transmitting) unit in the antenna device of the present application is provided to solve the above-mentioned problems of the prior art. An object of the present application is to provide a structure of a signal transmission / reception unit in an antenna device whose appearance is beautiful by covering a primary radiator and a converter main body with a cover.
Another object of the present invention is to provide a structure of a signal transmission / reception unit in which the number of parts related to the cap is reduced, labor for attaching the cap to the opening 2a is reduced, and the cost of members and labor associated therewith can be reduced. Is what you do. Another object is to attach a member corresponding to a cap to the opening 2a, but the attaching means is accurate and allows the signal transmitting / receiving section of the antenna device to be attached with high accuracy. It seeks to provide structure. The other purpose is to attach a member corresponding to a cap to the opening 2a, and the attachment state of the member does not change even with the use over time, maintaining a long-life attachment state forever, An object of the present invention is to provide a structure of a signal transmitting / receiving unit in an antenna device that can be used with security. Other objects and advantages will become more readily apparent from the drawings and the following description associated therewith. [0007] The structure of the signal transmission / reception unit in the antenna device according to the present invention includes a primary radiator for receiving a signal from a parabolic antenna and a frequency conversion of a signal coming from the primary radiator. In the high-frequency signal transmitting / receiving unit in the antenna device including a converter-body for performing the operation and a cover that covers the primary radiator and the converter-body, the cover has a front face of the primary radiator. A first covering element for covering, a second covering element for covering the outer peripheral surface of the primary radiator, a third covering element for covering a substantially front half of the converter body, and a rear cover element. A front cover element formed by integrally molding a joint portion facing the joint portion using a synthetic resin material, a fourth covering element for covering substantially the rear half of the converter body, and a front cover element. A back cover element formed by integrally molding a joint portion facing the joint portion of the primary radiator with a back cover element formed integrally with a synthetic resin material; The inner side of the element comes into contact with the member around the primary radiator, and the inner side of the fourth envelope element comes into contact with the member at the rear half of the converter main body. By doing so, the primary radiator and the converter main body are covered. [0008] Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show the configuration of a high-frequency signal transmitting / receiving unit 1 in an antenna device including a parabolic antenna and a high-frequency signal transmitting / receiving unit (including only a receiving unit or a transmitting unit). In these figures, the high-frequency signal transmission / reception unit 1 is connected via a transmission / reception unit support arm 5 so as to maintain a fixed positional relationship with a parabolic antenna (not shown) as is well known. The signal transmitting / receiving unit 1 includes a primary radiator 2 for transmitting / receiving a signal from a parabolic antenna, a converter / main body 3 for frequency-converting a signal coming and going from the primary radiator 2,
Terminal 4 for inputting and outputting signals from the converter body
And a connecting member 6 protruding from the signal transmitting / receiving section for connecting the signal transmitting / receiving section 1 to the tip of the transmitting / receiving section supporting arm, and the primary radiator and the converter main body are disposed so as to cover the primary radiator and the converter body. And a cover 7. The illustrated primary radiator 2 has, as is well known, a trumpet-shaped opening (horn) 2a having a wide open end for introducing and receiving radio waves, and a cylindrical hollow circular waveguide. (In the following description, the signal derivation function may be partially omitted because it has the same meaning as the introduction function). In the circular waveguide 2b, a well-known transmitting / receiving member (for example, the phase difference plate 26) for receiving, for example, a right-handed or left-handed circularly-polarized radio wave when introduced therein is disposed therein. .
The transmission / reception member may be a transmission / reception member for receiving only a right-handed or left-handed circularly-polarized radio wave when introduced, or a right-handed or left-handed circularly-polarized radio wave. Two sets of transmitting and receiving members for individually receiving both of them when introduced may be used. Converter body 3
Has a configuration in which one end 3a is communicated with the introduction portion 2b and the other end 3b is opened, and a lid 3c formed by pressing a sheet metal is removably attached to the opening 3b, and an arbitrary configuration is provided inside. A printed circuit board 3d on which an electronic circuit is mounted is provided. The output terminal 4 is also called a coaxial connector connection portion, and includes an outer conductor 4a and an inner conductor 4c as is well known. The cylindrically formed outer cover portion 4a is a conductive material integrally formed with the introduction portion 2b and the structural portion of the converter main body 3, the downwardly-facing cylindrical pedestal 15 provided below the converter main body, and further with the connecting member 6 and the like. Made by die casting process. Alternatively, as shown in the drawing, the outer cover portion (outer conductor 4a) is separately formed as is well known, and the female screw hole for the connector connection portion provided below the center of the base 15 as the plug base is located above the female screw hole. It is also formed by screwing and integrating the members electrically and mechanically. As is well known, an internal conductor 4c held by an insulating material 23 is provided in a space 4b inside the jacket portion 4a, and a circuit of the printed board 3d is connected to the internal conductor 4c. Reference numeral 18 denotes a connector mounted on the end of the coaxial cable 17. Reference numeral 18a is adapted to be screwed into a male screw provided around the outer periphery of the outer cover portion 4a to mechanically fix the connector to the outer cover portion 4a and to connect the high frequency to the outer cover of the coaxial cable. Nut member,
Reference numeral 18b denotes a center conductor, which is connected to a core wire of the coaxial cable 17. Reference numeral 20 indicates the presence of a waterproof cap made of a resilient material as is well known. A waterproof cap insertion gap 15b is formed around the pedestal 15 and has an annular bottomed cap with an open bottom, and a waterproof wall 15c having the upper part integrated with the pedestal 15 is integrally formed at an outer peripheral position separated by the gap. It is. Outer peripheral surface 15a of the cylindrical pedestal 15
A connector connecting portion 4 provided below the center of the base.
The upper part of the waterproof cap 20 which is provided so as to enclose the elastic member is elastically contacted. Upper part 20a of waterproof cap 20
The opening size of the upper part of the waterproof cap 20 with respect to the outer peripheral surface 15a of the base 15 is
b, the lower part of the lightly elastic waterproof cap 20 is pinched from below, and is set to such a size that it can be pushed up while opposing the elastic resistance. The connecting member 6 extends diagonally forward and downward from the upper position 15 of the output terminal 4 at a well-balanced position close to the front center of gravity, as shown in FIG. is there. Upper position 6 of the connecting member 6
The support member 14 for supporting the base 2c of the primary radiator 2 and a part 3a of the converter main body 3 on the primary radiator side from the upper side is formed of an integral material. As shown in FIG. 2, the other end 5a of the hollow transmitting / receiving section support arm 5 having a rectangular cross section mounted at one end in a state of maintaining a fixed positional relationship with a parabolic antenna (not shown). 6 is integrally connected to the other end 5a of the arm 5 so as to be freely inserted and removed. 6a
Is a female screw hole for screwing the bolt 19 into which the bolt 19 is screwed. In the tightened state as shown in FIG. 2, the members 6c at both ends of the connecting member 6 come into contact with the inner surface of the arm 5 and they are integrated. Is becoming The cover 7 surrounding the primary radiator 2 and the converter body 3 is bisected in the signal incoming direction 24 of the primary radiator as shown in FIGS. The front cover element 8 and the rear cover element 9 are formed using a synthetic resin (for example, a hard resin such as an ABS resin). The front cover element 8 includes a first envelope element 8a formed to be thin to about 1 mm so as to cover the front face 2a of the primary radiator, and a space 2 around the primary radiator 2b.
5, a second wrapping element 8b which is rigidly formed to protect the primary radiator 2b and a converter body 3
The third covering element 8 for protecting the portion of the output terminal 4 on the pedestal 15 located substantially at the front half of the base member and at the base of the connecting member 6
c, 8f, and a joining portion 8d facing the joining portion 9d of the rear cover element 9. 8h is the first wrapping element 8
3A is a resin rod (dielectric rod) integrally or additionally provided at the center of FIG. The inner surface portion around the first wrapping element 8a is in contact with the front surface and surrounding members of the horn 2a, and the inside of the second wrapping element 8b is also located at various places from the outer peripheral portion of the peripheral wall of the primary radiator 2b. Alternatively, the support member 2h, which is formed in a relatively protruding shape from the inside of the second envelope element 8b, is brought into contact with the support member 2h, and is integrated with the primary radiator 2b and reinforced to have a strong structure. The rear cover element 9 includes the converter body 3
And the fourth covering elements 9a and 9b for protecting substantially the rear half of the periphery, and the lower side of the converter main body 3 (the output terminal 4).
And a joint portion 9 for protecting the peripheral portion of the front cover element 8 with the joint portion 8d of the front cover element 8.
d. Below the rear cover element 9, a waterproof cylindrical body 9e having a hollow portion 9f and having an annular shape is integrally formed and provided. The waterproof cylindrical body 9e surrounds the waterproof cap 20 which is provided so as to cover the connector connection portion 4, and is arranged so that a slight annular gap 28 for removing the waterproof cap is formed inside. The waterproof cylindrical body 9e
Although the illustrated shape of the upper position 9g of the above remains as a cylindrical shape, it may be a trumpet shape expanding upward. However, a gap 29 is provided between the upper position 9g and the lower end of the waterproof enclosure 15c. This gap 29 is
Even when a strong strong wind blows up from below (from the direction of arrow 30), water droplets adhering to the periphery of the waterproof cap 20 rise, and the inside of the waterproof enclosure 9e is inserted into the annular waterproof cap whose lower part is released. The upper part of the waterproof cap is pushed up by the gap 15b, and is continuously pressed by air pressure.
A gap 29 for allowing air entering from below (from an arrow 30) to escape into the cover 9 so as not to reach the connector connecting portion 4 by passing through the close contact portion inside 0a. Due to the presence of the gap 29, even in the event of a storm, even when a strong wind instantaneously blows up from below (from the arrow 30) toward the connector connection portion 4, the power is temporarily reduced by the waterproof cylindrical body 9e. Weakening, the gap 2 inside it
Even if the rainwater is pressed into the water 8 vigorously, the upper clearance 29
As a result, the pressure is extremely reduced due to the air being scattered, and the force for press-fitting into the annular waterproof cap insertion gap 15b inside the waterproof enclosure 9e is lost. In such a state, it is possible to prevent the water droplet from opening and passing through the close contact portion inside the upper portion 20a of the waterproof cap. The shape of the outer edge of the enclosing element 9c for protecting the lower side of the converter main body 3 (peripheral portion of the output terminal 4) is as shown in FIG.
The shape of each member is complementary to that of the other members, and the shape is as small as possible to prevent rainwater from entering between them. In addition, the water droplets that have entered slightly cannot enter the space where the electronic components protected by the members made by the internal die casting method exist,
The water is drained from the escape gap 29, the drain hole 27 and the like. Each of the plurality of first and second engagement pieces 10 and 11 in the cover 7 has a base portion, a front cover element 8,
The front end is integrally attached to the rear cover element 9 so that elasticity can be obtained in the engagement direction. Engaging piece 10
At the end of the converter, an engaging claw 10a is formed, and when attached to the primary radiator 2 from the direction of the arrow 24, it engages with four to six protrusions 10b provided on the peripheral wall of the converter body 3 as shown in the figure. I try to stop. An engaging claw 11 a is formed at the tip of the corresponding number of engaging pieces 11, and after the front cover element 8 is attached to the primary radiator 2, the engaging piece 10 is attached when the rear cover element 9 is attached. As shown in FIG. As shown in FIG. 4, the joint 16 between the front cover element 8 and the rear cover element 9 is formed such that a concave portion and a convex portion can be complemented on both sides so as to prevent rainwater from entering.
Also, the position of the joint portion 16 is set so that the water does not enter the converter main body 3 even if there is water leakage. It is set at an arbitrary position around the side. In this case, the shape of the inner surface of each of the cover elements 8 and 9 that covers the substantially front half portion on the front side and the substantially rear half portion on the rear side of the converter body 3 is determined corresponding to the shape of the outer peripheral surface of the converter body 3. The outer peripheral surface of the converter main body 3 and the inner surface of the cover 7 have a relative configuration such that the two contact each other mechanically in a dotted manner, for example, by forming a protruding rib 9h on the inner surface of the cover. What is necessary is just to form a protrusion. When the front cover element 8 is put on the left side of FIG. 2 and then the rear cover element 9 is put on the right side of FIG. 2, the position of the largest diameter portion of the output terminal 4 is fittable (FIG. Attached part 1)
6 may be determined. In the above structure, the main body of the primary radiator 2 and the converter body 3 are integrally formed by a die casting method or a casting method using another conductive material.
Body, the pedestal 15 of the output terminal 4 (and the outer cover portion 4a if necessary), the base member including the connecting member 6, etc.
The known internal elements such as the printed circuit board 3d and the internal conductor 4c are sequentially assembled to convert a signal coming from the direction of the arrow 24 and transmit it to the coaxial cable 17. Next, from the left and the right in FIG.
And the rear cover element 9 is relatively put on the base in the state of FIG. In this assembling operation, even if a waterproof tubular body 9e formed in a hollow and annular shape as shown in FIG. 4 is integrally attached below the rear cover element, the formation position is as shown in FIG. When the front cover element 8 and the rear cover element 9 are relatively bonded to each other, the front cover element 8 and the rear cover element 9 are formed so that a part (about a half) is protruded around the position of the bonding section 16 as shown in FIG. If the output terminal member 4a, which is protruded in advance, is inserted into the hollow portion 9f of the waterproof cylindrical body 9e, there is an advantage that it can be easily attached with less effort, and if the output terminal member 4a is attached and fixed in the state of FIG. Good. Next, the other end 5a of the transmitting / receiving unit supporting arm 5 is put on the connecting member 6 and fixed using bolts 19 as shown in the figure. In this case, the tip of the other end 5a is attached so as to be in close contact with the lower end of the envelope element 8f. In addition, necessary watertight packing will be placed in each place.
Reference numeral 12 denotes a well-known corrugated choke, around which a packing (seal material) 21 is provided. A packing (seal material) 22 is also provided around the lid. Output terminal 4
Packing (sealant) 2 for waterproofing in the space 4b above
3 is provided. In this way, rainwater is prevented from penetrating into the main body of the primary radiator 2, the main body of the converter-body 3, and the inside of the jacket portion 4a of the output terminal 4. As described above, the present invention provides the primary radiator 2
By covering the converter body 3 with the cover 7, there is an effect that the signal transmitting and receiving unit 1 in the beautifully designed antenna device can be provided. In the front cover element 8 according to the present invention, a first covering element 8a for covering the front surface of the primary radiator 2 is provided.
And the primary radiator 2 has a first
The covering element 8a covers the front surface of the primary radiator, and the inside of the second covering element 8b covers the primary radiator in a state of contact with the surrounding member 2b, so that the rear cover element 9 is joined. Of course, it is not necessary to use a small cap as a special member for the opening 2a.
By combining the joint portions of the front cover element 8 and the rear cover element 9, there is an operational effect that the first envelope element 8 a can also be assembled with only the assembly of the cover 7. Further, according to the state where the front cover element 8 and the rear cover element 9 are combined, the position of the first covering element 8a for covering the front surface of the primary radiator is inevitably the primary radiation. The arrangement is very accurate with respect to the front part of the vessel, and has an effect that the high-frequency characteristics in the introduction portion 2b become extremely good. Of course, the front cover element 8
And the rear cover element 9 has a large form,
The joints 8d and 9d of the two will be mechanically extremely rigidly joined, and according to the state where the two elements 8 and 9 are combined, the first small part located at the front surface of the primary radiator will be described. The wrapping element 8a does not have to worry about being separated separately, and has an effect of maintaining the state for a long time as a member of the cover 7.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a front view of a signal transmitting / receiving unit, and FIG.
Left side view, (C) is a right side view. FIG. 2A is a front view of a signal transmission / reception unit partially cut away at a position II in FIG. 3, and FIG. 2B is an enlarged view taken along a line II-II. (C) is an enlarged view of a part C of (A). FIG. 3 is a bottom view of a signal transmission / reception unit. FIG. 4A is a front view showing a state in which a pair of cover elements are separated, and FIG. 4B is a partially enlarged view taken along line BB ′. [Explanation of Signs] 1 ... High-frequency signal transmission / reception unit, 2 ... Primary radiator, 3
... Converter body, 4 ... Output terminals, 5 ...
Transmitter / receiver support arm, 6 ... connecting member, 7 ... cover, 8 ... front cover element, 9 ... rear cover element, 10 ... first engagement piece, 11 ... first 2 engagement pieces, 1
4 ... support member, 15 ... pedestal, 16 ... joining part.

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Claims (1)

Claims 1. A primary radiator for transmitting and receiving a signal from a parabolic antenna, a converter for converting a frequency of a signal coming and going from the primary radiator, and a primary radiator and a converter -In a high-frequency signal transmitting and receiving unit in an antenna device having a cover that covers the main body, the cover includes: a first covering element for covering a front surface of the primary radiator; A second covering element for covering the outer peripheral surface, a third covering element for covering a substantially front half of the converter main body, and a joining portion facing the joining portion of the rear cover element. A synthetic resin material comprising: a front cover element integrally formed by using the above; a fourth covering element for covering substantially the rear half of the converter main body; and a joint portion facing the joint portion of the front cover element. And molded together using The first cover element covers the front surface of the primary radiator, and the inside of the second cover element abuts on a member around the primary radiator;
The primary radiator and the converter main body are wrapped by covering the inner side of the wrapping element from the left and right in a state where the inner side of the wrapping element is in contact with the member of the rear half of the converter main body to unite the joint portions of the two. The structure of the signal transmitting / receiving unit in the antenna device, characterized in that: