JP2004129031A - Communication antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication antenna having a structure in which a fault of a reflector element having a weak structure hardly occurs, even if the antenna is constituted by connecting a radiator element having a comparatively rigid structure and the reflector element having a structure weaker than the radiator element with each other. <P>SOLUTION: In mounting a reflector on upper and lower supporting frames, a reflector mounting fixture having a downward recessed portion is fixed on the upper supporting frame, a reflector receiving fixture having an upward recessed portion is fixed on the lower supporting frame, the upper and lower ends of the reflector are inserted into the recessed portions so as to be placed therein respectively, and a hollow cylindrical elastic member is provided between an external circumferential surface of each of the upper and lower ends of the reflector and an internal circumferential surface of each of the recessed portion facing the external circumferential surface. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a communication antenna mainly used for a base station of a mobile communication system, and conceptually, a communication antenna that can be used when a signal is radiated or received in a horizontal direction. It is about.
[0002]
[Prior art]
Conventionally known communication antennas of this type include a structure such as a handrail member of a veranda of a building, a support frame which can be mounted on a support (pole) having an arbitrary height, and the like. A radiator and a lower part of a cylindrical reflector are used by being connected so as to be juxtaposed with a gap being formed between the radiator and the reflector (for example, see Patent Document 1).
However, the above configuration has a feature that the configuration is simplified, but both the cylindrical element in the radiator and the cylindrical element in the reflector have weak mechanical strength, and the mounting state is low. When the element is subjected to strong wind, such as being exposed to strong wind, the upper part of each element will be protruded from the veranda of the building to the road side, so that when the element is subjected to a heavy load, cracks or However, there was a problem that breakage occurred.
[0003]
[Patent Document 1]
1995 Utility Model Publication No. 5682 (Fig. 1)
[0004]
[Problems to be solved by the invention]
In order to solve the above problems, the applicant's company has tried to interconnect the upper and lower elements of the radiator element and the reflector element, which are arranged side by side, with each other. As a result, no particular problem occurred for the radiator element, but for the aluminum element in the cylindrical reflector, cracks were formed between the upper and lower support frames or in a portion near one of the support frames. As a result, problems that hinder commercialization have arisen.
[0005]
An object of the present application is to provide a communication antenna having a robust structure by interconnecting the radiator element and the reflector element in a juxtaposed state, and the upper and lower elements of the reflector element. Is what you do.
Another object is to interconnect the radiator element, which is a relatively strong structure, and the reflector element, which has a weaker structure than the radiator element, even if they are interconnected. It is an object of the present invention to provide a communication antenna having a configuration in which a failure of a reflector element becomes difficult to occur.
Other objects and advantages will become more readily apparent from the drawings and the following description associated therewith.
[0006]
[Means for Solving the Problems]
The communication antenna according to the present invention is arranged such that the upper and lower sides of the cylindrical radiator and the cylindrical reflector are juxtaposed such that a gap is formed between the radiator and the reflector. The first and second support frames are connected to form a communication antenna, and the upper and lower support frames are connected to structures such as columns so that they can be used. In a communication antenna,
Attachment of the reflector to the first support frame and the second support frame above and below the reflector is performed by fixing a reflector cover having a downward recess to the first support frame, and attaching an upward recess to the second support frame. The reflector receiver having the reflector is fixed, and the upper and lower ends of the reflector are inserted and placed in the respective recesses, and the outer peripheral surfaces of the upper and lower ends of the reflector and the outer peripheral surfaces of the respective recesses opposed thereto are fixed. Between the inner peripheral surface, always maintain the cylindrical reflector at the center position of each concave portion, when the cylindrical reflector bends in an arc, relative to the inner peripheral surface of each concave portion, The outer peripheral surface of the end portion of the reflector inserted into the concave portion is provided with a hollow cylindrical elastic material for allowing the outer peripheral surface to tilt.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, drawings illustrating embodiments of the present invention will be described.
FIG. 1A is a front view of a communication antenna with a part cut away, and FIG. 1B is a plan view. FIG. 2 is a partially broken longitudinal sectional view showing the relationship between the tubular element of the radiator and the mounting portion thereof, and FIG. 3 (A) shows a tubular element having a common configuration for a plurality of reflectors. And a partially broken front view for showing the relationship between the mounting portion and the mounting portion. FIG. 3B is a partially broken longitudinal sectional view showing the relationship between the tubular element in the reflector and the mounting portion thereof. (C) is a partial sectional view of the reflector receiver and the reflector cover. (D) shows a view of (C) viewed from below.
[0008]
In these figures, reference numeral 1 denotes a radiator 4, a first reflector 5, a second reflector 6, and a third reflector (visible behind the radiator 4 in FIG. 1A). No) is shown. The number and position of the reflectors may be arbitrarily increased or decreased according to the environment of the communication means, or the positions may be set according to the required directivity. The tubular body (also referred to as an element) of the radiator 4 and the tubular body (also referred to as an element) of the reflectors 5 and 6 have a high frequency between the radiator 4 and the reflector 5 corresponding to the operating frequency. It is configured to be in a juxtaposed state in a state where the necessary gap 7 is formed. As shown in FIG. 1, the upper and lower ends of the radiator 4 and the plurality of reflectors 5 respectively include a first support frame 2 positioned above and a second support frame positioned below. 3 Thus, the communication antenna 1 is configured.
The two support frames 2 and 3 of the communication antenna 1 may be directly connected to each other by an arbitrary hard member to form the communication antenna 1, but may be any structure, for example, a handrail member of a veranda of a building. It is mounted on a pole (pole) 10 of an arbitrary height or the like in a vertical state or in a state of being inclined forward to be used.
[0009]
Reference numerals 2a and 3a denote connecting portions of the supporting frames 2 and 3 formed of an iron plate material, and have connecting through holes 2b and 3b (3b does not appear in the drawing). The connecting portions 2a and 3a are superposed on the mounting member 11 (provided with through-holes corresponding to the connecting through-holes 2b and 3b) in a state of being taken out from the column 10 side. Using the through holes 2b, 3b, it is detachably fixed by a fastener (for example, a bolt) 12.
[0010]
The upper and lower ends of the radiator 4 are attached to the first support frame 2 and the second support frame 3 by a cover 36 having a downward concave portion 36b with respect to the first support frame 2 as shown in FIG. 2 is fixed to the second support frame 3 as shown in FIG. 2, and a receiving member 15 having an upward concave portion 15b is fixed to each of the upper and lower protective pipes 35 of the radiator 4 in each concave portion. The ends 35a and 35b are inserted and left.
[0011]
The receiving member 15 having the upward concave portion 15b is formed by cutting an aluminum alloy material, but may be formed by die casting, for example. For attachment to the second support frame 3, a flange portion 15a projecting to the outer periphery is formed, and a connecting portion 16 penetrating through the through hole 3c is formed. Freely tightened. Reference numeral 19 denotes a waterproof tube formed in a hollow cylindrical shape using a synthetic resin or a metallic material (for example, an aluminum alloy material). The waterproof tube is inserted into the surrounding wall 17 a formed below the stopper 17. And, it is fitted on the outer periphery of the connecting portion 16 and is detachably fixed by a push screw-shaped fastening member 20.
[0012]
The cover 36 having the downward concave portion 36b is formed by cutting an aluminum alloy material like the receiver 15, but may be formed by die casting, for example. Attachment to the first support frame 2 is performed by forming a flange portion 36a projecting to the outer periphery and forming a main body portion 36 having a size penetrating through the through hole 2c, and forming the main body portion by die casting, for example. The female screw formed on the inside of the cap 38 and the male screw formed on the outer periphery of the main body 36 are screwed 39 together with the portion facing the overhang portion 36a. Is fixedly fastened.
[0013]
As an element configuration of the radiator 4, an arbitrary configuration such as a ground plane antenna, a collinear antenna, a sleeve antenna, and a whip antenna is selected depending on a used band, an urban environment, and the like. An example using a collinear antenna 30 is shown. Reference numeral 31 denotes a coaxial line (coaxial cable) constituting each radiating element, which is formed to have a length of a half wavelength and includes a center conductor 31a and a jacket conductor 31b. For example, it is configured by inserting a center conductor provided with an insulator around the inside of a brass pipe. These have a structure in which a center conductor 31a and a jacket conductor 31b of a coaxial line vertically adjacent to each other are alternately connected as shown in the figure. The radiating element 31 is supported by an insulating material disposed at an appropriate distance from the inner peripheral surface of the protective pipe 35 as is well known. Reference numeral 32 denotes a sleeve having a well-known configuration for preventing leakage of radio waves and stabilizing the characteristics of the antenna, and has a length of ４λ.
Reference numeral 23 denotes a well-known relay connector. A coaxial cable 33 is connected to the upper end using ordinary connection means such as soldering, and a well-known connector 24 connected to a coaxial cable 25 is detachably connected to the lower end. (FIG. 2 shows a state before the connector 24 is screwed to the relay connector 23, but in use, these are screwed and used as is well known). The relay connector 23 is inserted into the receiver 15 from below with the coaxial cable 33 at the upper end connected thereto, and a male screw provided around the relay connector 23 is screwed into a female screw provided on the inner periphery of the receiver 15. Stick together. Numeral 25 indicates a coaxial cable which is consequently connected to the coaxial line 33 at the upper end in a known manner.
Next, reference numeral 35 denotes a protective pipe (radome) formed of a general synthetic resin (for example, FRP: glass fiber reinforced plastic may be used as a material). The pipe 35 protects the mechanically weak radiating element 30. The radiating element 30 is inserted into the pipe 35, and has an elastic space around the pipe 35 at an appropriate distance in the longitudinal direction. The radiating element 30 is always positioned at the center of the protective pipe 35 with an intervening member (not shown) such as styrene foam.
The upper and lower ends 35a and 35b of the protection pipe 35 are inserted into the downward recess 36b of the cover 36 and the upward recess 15b of the receiver 15, respectively. It is fixed using 37,28. Reference numeral 27 denotes an O-ring that is used to bring the outer periphery of the protection pipe 35 into close contact with a member surrounding the protection pipe 35.
[0014]
Next, when the reflectors 5 and 6 are mounted on the first support frame 2 and the second support frame 3 above and below, the reflector cover 50 having the downward recess 50 c is fixed to the first support frame 2. A reflector receiver 41 having an upward concave portion 41c is fixed to the second support frame 3, and the upper and lower ends 5a, 6a, 5b, 6b of the reflectors 5, 6 are inserted into the respective concave portions. Leave and fix.
In this case, a cylindrical member of the reflector is provided between the outer peripheral surface of each of the upper and lower ends 5a, 6a, 5b, 6b of the reflector and the inner peripheral surface of each of the concave portions 41c, 50c opposed thereto. It is fixed in a state in which hollow cylindrical elastic members 46 and 51 for absorbing vibration of certain elements 5 and 6, particularly vibration caused by resonance, are interposed. The tubular elements 5, 6 of the reflector are formed of a mechanically weak aluminum hollow pipe material, as is well known.
[0015]
The reflector receiver 41 having the upward concave portion 41c formed in the surrounding portion 41b is formed of an aluminum alloy material, for example, die casting, similarly to the receiver 15, and the lower main body portion 41a has a hollow hole 41e. Which is provided with an internal thread on its inner surface. The main body portion 41a is attached to the second support frame 3 by concentrically placing the hollow hole 41e of the main body portion 41a on the through hole 3d, and screwing the fastener 41 with the bolt-shaped hexagonal head 42b. The portion 42a is screwed and fixed detachably. Reference numeral 42c is a through hole for draining water. A plurality of flat notches 41d are formed in the periphery of the main body 41a, respectively, so that the main body 41a can be used as a spanner hook. Reference numerals 44 and 45 indicate examples of use of commonly used washers, spring washers, and the like.
[0016]
The reflector cover 50 having the downward concave portion 50c formed in the surrounding portion 50b is configured to be symmetrically interchangeable with the reflector receiver 41, and similarly to the receiver 15, an aluminum alloy material, for example, die casting or the like. It is formed by the following. A hollow hole 50e is formed in the upper main body 50a, and an internal thread is provided on the inner surface thereof. The attachment of the main body 50a to the first support frame 2 is performed in the same manner as in the case of the reflector receiver 41 by making the hollow hole 50e of the main body 50a concentrically correspond to the through hole 2d, The screwing portion 53a of the bolt-like fastening tool 53 provided with is screwed and fixed detachably. A plurality of flat notches are formed in the periphery of the main body 50a, respectively, so that the main body 50a can be used as a spanner hook. Reference numerals 44 and 45 indicate examples of use of commonly used washers, spring washers, and the like.
[0017]
Next, reference numerals 46 and 51 denote holding members inserted and retained inside the upward concave portion 41c and the downward concave portion 50c, respectively, which are formed to have elasticity using synthetic rubber, plastic material or the like. These holding members 46 and 51 always maintain the cylindrical reflector 5 at the center position of each of the concave portions 41c and 50c and maintain the interval 7 depending on the exact frequency with the radiator 4, When the cylindrical reflector 5 bends in a bow due to strong wind, the end portions 5a of the reflector inserted into the recesses with a slight gap between the inner peripheral surfaces of the recesses 41c and 50c are disposed. The outer peripheral surfaces of 6a, 5b and 6b can be tilted.
In this holding member, the foreskin portions 46a, 51a are elastically close to the outer periphery (diameter 13.5 mm) of each end 5a, 6a, 5b, 6b of the reflection element 5, 6, and Their outer periphery is elastically close to the inner surface of the upward concave portion 41c or the downward concave portion 50c, respectively. For example, the thickness of the foreskin portions 46a and 51a is approximately 2.25 mm, which is approximately the same as the element thickness of 2.5 mm. Reference numerals 46b and 51b denote elastic receiving portions, each having a thickness of about 3 mm, and formed integrally with the holding members 46 and 51 so as to obtain elasticity. 46c indicates a through hole for draining water.
[0018]
The assembling work of the above-described configuration uses the receiving member 15, the reflector receiving member 41, the stopper 17 and the fastening member 42 with respect to the through holes 3c and 3d of the second support frame 3, respectively. And fixed as shown.
In the case of the mounting, the lower end 35a of the protection pipe 35 in which the radiating element 30 is housed is inserted in advance into the upward concave portion 15b of the receiving member 15, and is fixed by the fastening member 28. An O-ring 27 for waterproofing is also provided in advance as shown in the figure.
The ends 5b and 6b of the reflection elements 5 and 6 with the holding members 46 are inserted into the upward concave portions 41c of the reflector receiver 41.
[0019]
Next, the covering 36 is fixed to the upper end 35b of the protection pipe 35 and the upper ends 5a, 6a of the reflecting elements 5, 6, and the reflector covering 50 is covered. In that case, the holding members 46 are previously put on the upper ends 5a, 6a of the reflection elements 5, 6, respectively. Next, the cover 36 and the fastener 53 are inserted into the through holes 2c and 2d of the first support frame 2, respectively, and are fixed using the cap 38 and the fastener 53 as illustrated.
If necessary, the steel antenna 10 is connected to the communication antenna 1 integrated between the upper and lower two connecting portions 2a, 3a, or brought to the site without being integrated, or brought into the field without being connected. The two connecting portions 2a, 3a are directly or indirectly attached to the structural support 10 previously installed on the site and used for transmission (or reception). Although the above-described example of assembly shows an example of the work, the order of the work may be partially reversed depending on the convenience of the work.
[0020]
In the use state of the above configuration, when the upper and lower two connecting portions 2a, 3a are directly or indirectly attached to the structural support 10, the positional relationship is fixed, and the radiator 4 and the reflection The vessels 5, 6 will be stably supported by a solid structure even under strong wind.
Moreover, in this case, the first support frame 2 and the second support frame 3 are connected to each other by the structural support 10 and the relatively strong protection pipe 35 to form a rigid body. On the other hand, the reflectors 5 and 6 attached thereto have a low mechanical bending strength because they are usually formed using an aluminum pipe or the like, and vibrate independently while largely bending under the influence of a strong wind. However, in the above embodiment, the upper and lower ends 5a, 6a, 5b, 6b of the reflector elements 5, 6 are directly and mechanically fixed to the upper and lower first support frames 2 and the second support frame 3, respectively. Instead of the configuration, the upper and lower ends 5a, 6a, 5b, and 6b are inserted into the downward recess 50c and the upward recess 41c, respectively, and the inner surfaces thereof and the upper and lower ends 5a, 6a, 5b, and 6b are formed. In the meantime, the cylindrical reflector is always maintained at the center position of each concave portion, and when the cylindrical reflector bends in an arc, the inner peripheral surface of each concave portion is placed in the concave portion. A resilient structure in which a hollow cylindrical elastic material is interposed to allow the outer peripheral surface of the inserted reflector to slightly tilt the end outer peripheral surface, and the vibrations of the elements 5 and 6 are absorbed, respectively. The holding members 46 and 51 having the properties are covered in advance. The part floats in the air, and even if the reflector elements 5 and 6 bend in a bow due to strong wind, there is no possibility that the mouths of the concave portions 50c and 41c will be broken or cracked at the mouths of the concave portions 50c and 41c. Fatigue due to vibration of the steel is also prevented, and can be used for a long life.
[0021]
【The invention's effect】
As described above, according to the present invention, the upper side and the lower side of the radiator element 4 and the reflector element 5 which are arranged side by side are integrally connected to each other by the support frame, and Since the support frames are also connected and integrated, the whole communication antenna has a feature of having a strong structure.
[0022]
In addition, in the present invention, the element 4 of the radiator, which has a relatively strong structure, and the element 5 of the reflector, which has a weaker structure than the element 4 of the radiator, are interconnected. Even so, the upper and lower end portions 5a and 5b of the reflector element 5 having a weak structure are inserted into the downward concave portion 50c and the upward concave portion 41c, respectively, and furthermore, the inner surfaces of these concave portions and the upper and lower ends Between the parts 5a, 6a, 5b and 6b, elastic holding members 46 and 51 configured to absorb the vibration of the element 5 are interposed, respectively, so that the ends are in the air. Even if the reflector elements 5 and 6 bend in a bow due to the strong wind, there is no danger that the mouths of the concave portions 50c and 41c will be broken due to twisting or cracked due to twisting. Fatigue due to vibration such as resonance may be prevented, there is an effect that can be put to use as a long lifetime.
[Brief description of the drawings]
FIG. 1A is a front view of a communication antenna with a part cut away. (B) is a plan view.
FIG. 2 is a partially broken longitudinal sectional view showing a relationship between a tubular element in a radiator and a mounting portion thereof.
FIG. 3A is a partially cutaway front view showing a relationship between a tubular element in a reflector and a mounting portion thereof. FIG. 3B is a partially broken longitudinal sectional view showing the relationship between the tubular element in the reflector and the mounting portion thereof. (C) is a partial sectional view of the reflector receiver. (D) is the figure which looked at (C) figure from the lower side.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Communication antenna, 2 ... 1st support frame, 3 ... 2nd support frame, 4 ... Radiator, 5 ... 1st reflector, 6 ... 2nd reflector , 7: gap, 10: support column, 11: mounting member, 12: fastening member, 15: receiving member, 16: connecting portion, 17: stopper, 18. ..Screw portion, 19 ... waterproof cylinder, 20 ... stopper member, 23 ... connector, 24 ... plug, 25 ... coaxial cable, 27 ... O-ring, 28 ... Attaching member, 30 ... Cornier antenna, 31 ... Coaxial line, 31a ... Central conductor, 31b ... Outer conductor, 32 ... Sleeve, 33 ... Connection conductor, 35: Protective pipe, 36: Cover, 37: fastening member, 38: Cap, 39: Screwed part, 41: Reflector receiver, 42: Tightening Tool, 46 ... Holding member, 50: reflector covering member, 51: holding member, 53: fastening member,

Claims (1)

A first support frame positioned above the cylindrical radiator and the cylindrical reflector so that the upper and lower sides of the cylindrical radiator are juxtaposed with a gap between the radiator and the reflector. And a second supporting frame positioned below and connected to form a communication antenna, and the upper and lower supporting frames are connected to a structure such as a support to be used in a communication antenna.
Attachment of the reflector to the first support frame and the second support frame above and below the reflector is performed by fixing a reflector cover having a downward recess to the first support frame, and attaching an upward recess to the second support frame. The reflector receiver having the reflector is fixed, and the upper and lower ends of the reflector are inserted and placed in the respective recesses, and the outer peripheral surfaces of the upper and lower ends of the reflector and the outer peripheral surfaces of the respective recesses opposed thereto are fixed. Between the inner peripheral surface, always maintain the cylindrical reflector at the center position of each concave portion, when the cylindrical reflector bends in an arc, relative to the inner peripheral surface of each concave portion, A communication antenna, characterized in that a hollow cylindrical elastic member is interposed between the reflector and the end outer peripheral surface of the reflector inserted into the concave portion so as to be able to tilt.

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