JP4739034B2 - antenna - Google Patents

Description

The present invention relates to an antenna for receiving television, and more particularly to an antenna for receiving digital terrestrial broadcasting that is used by being mounted on a wall of a building.

As a terrestrial broadcast receiving antenna that receives long-wave and medium-wave terrestrial signals, a Yagi-Uda antenna with a waveguide in front and a reflector in parallel with a rod-shaped feed element is widely used.
However, the newly started terrestrial digital broadcasting has its reception state changed according to the strength of the radio wave like an analog signal, even though the frequency band uses the low frequency side of the UHF frequency band of the conventional analog broadcasting. As long as it can receive a clear image, the receiving antenna only needs to be able to receive a certain level of radio waves, and an antenna that is smaller and easier to handle than a conventional antenna is sufficient. There are cases.
(For example, see Patent Document 1)

JP 2005-117137 A

However, the Yagi-Uda antenna cannot change the length and shape of each element determined by the reception wavelength, and must still use multiple elongated conductor bars. In particular, the longitudinal direction, which is the direction of the received radio wave, is long and large. In addition, since the number of elements is large, the assembly is troublesome, and the end of each conductor bar is sharp and difficult to handle. For this reason, the installation work is troublesome, the wind pressure load is large, and it is often damaged by typhoons.
In addition, for example, a small UHF antenna made for digital terrestrial broadcasting can be configured to be installed on a veranda or the like in view of ease of installation. However, the veranda is also a part of the living space. If satellite antennas such as BS are already installed, it will be necessary to secure a space for installing the UHF antenna for digital terrestrial broadcasting. Even if it was possible, there was a problem that said it would interfere with futon drying.
In addition, when a digital terrestrial UHF antenna is installed on the veranda, the reception level is also low because the antenna is small in size and has a low gain, and the installation position is lower than when the antenna is installed on the roof. There was a problem that it would be low and the reception might not be successful.
On the other hand, it is possible to attach a mounting bracket with an antenna column to the wall of the building with bolts and attach the antenna to this antenna column, but in addition to the dimensions of the antenna itself in the longitudinal direction, When adjusting the direction of the antenna, a sufficient mounting space is required to prevent the reflectors from coming into contact with the wall surface. Therefore, the size of the antenna projecting outward from the wall surface becomes large. There was a problem that it was necessary to increase the strength and the construction would be difficult.
Furthermore, after terrestrial analog broadcasting is completed in 2011, it is impossible to raise the antenna for digital terrestrial broadcasting on the roof, considering removing the antenna for analog broadcasting installed on the roof. .
Therefore, in view of the above problems, an object of the present invention is to provide an antenna that is small and easy to assemble, has no protruding portion, and is easy to handle.
Therefore, in this application, it was made to solve these problems.
The purpose is to provide an antenna for receiving a television set on the wall of a building.
Another object is to provide a small antenna with good characteristics.
Another object is to provide an antenna for receiving digital terrestrial broadcasting by being attached to the wall of a building.

In order to solve the above problems, the invention of claim 1
In an antenna comprising at least a rectangular radiating conductor and a substantially rectangular reflecting conductor disposed behind the radiating conductor,
The reflection conductor, a vertical line perpendicular to the lateral axis as a bent portion, which has two reflective conductor portions arranged on left and right sides than the folded portions, foldably by the bent portion And
The radiating conductor has an axis line extending from the central point of the radiating conductor to one of the left and right tip portions of the radiating conductor, and the central point of the radiating conductor and the central point of the reflective conductor. It is configured to be able to swing within a first predetermined angle range from a position orthogonal to the front-rear direction line, which is a connecting direction line, in the front direction and the rear direction of the antenna.
In addition,
Both ends of the radiating conductor are connected to the one end of the radiation conductor and one of the two reflecting conductors, one of the two reflecting conductors, which is the reflecting conductor on the rear side of the one end of the reflecting conductor. And the connecting means on one side for changing the distance between the one end of the radiation conductor and the one side reflecting conductor by changing the distance between both ends thereof,
Of the left and right tip portions of the radiating conductor, the other tip portion opposite to the one tip portion, and the reflection of the two reflecting conductor portions on the rear side of the other tip portion Both ends are connected to the other-side reflection conductor portion, which is a conductor portion, and the distance between the opposite ends of the radiation conductor is changed by changing the separation distance between the both ends. Connecting means on the other side to be
With
When the radiating conductor is positioned so that its left-right axis is substantially perpendicular to the front-rear direction line, the distance between both ends of the two connecting means is maximized in the variable range. The horizontal axis of the side reflective conductor and the horizontal axis of the other reflective conductor are in a straight line substantially parallel to the horizontal axis of the radiation conductor,
The one end of the radiating conductor is inclined toward the front of the antenna by the first predetermined angle, and an angle formed between a horizontal axis of the radiating conductor and a direction perpendicular to the front-rear direction line is set to the first direction. The distance between both ends of the one-side connecting means becomes the maximum and the distance between both ends of the other-side connecting means becomes smaller than the maximum, so that the reflective conductor becomes , and bent at the bent portion, the said one substantially parallel lateral axis of the side reflecting conductor portion and the lateral axis of the radiation conductor, and the other side the longitudinal direction line is lateral axis of the reflection conductor portion It becomes a nearly square shape that is almost orthogonal,
The one end of the radiating conductor is inclined toward the rear of the antenna by the first predetermined angle, and an angle formed between a horizontal axis of the radiating conductor and a direction perpendicular to the front-rear direction line is set to the first direction. When the predetermined angle is set, the distance between both ends of the other-side connecting means becomes the maximum, and the distance between both ends of the one-side connecting means becomes smaller than the maximum. , and bent at the bent portion, on the other side reflecting conductor portion of the lateral axis is substantially parallel to the lateral axis of the radiation conductor, and the one the longitudinal direction line is lateral axis of the side reflecting conductor portion It becomes a nearly square shape that is almost orthogonal,
It is configured as follows.

According to a second aspect of the present invention, in the antenna according to the first aspect, the radiating conductor has a substantially rectangular radio wave radiation surface, and has an opening window extending in the left-right direction at a substantially central portion. A feeding point is formed at a projecting tip portion projecting from a substantially central portion of the left and right wall portions toward the center point of the radiation conductor.

According to a third aspect of the present invention, in the antenna according to the second aspect , when the reception or transmission wavelength is λ, the width of the radiation conductor in the horizontal direction is 0.25λ to 0.62λ, and the height is 0.21λ to 0.00. The distance between the radiation conductor and the reflection conductor is 0.07λ to 0.19λ.

According to a fourth aspect of the present invention, in the antenna according to any one of the first to third aspects, the back portion of the reflective conductor further includes a mounting means for an object to be mounted, and the mounting means is the front-rear direction line. (The direction line connecting the center point of the reflecting conductor and the center point of the radiation conductor ) is continuously variable from the same direction as the direction line orthogonal to the attachment object to the second predetermined angle in the left-right direction. And can be fixed.

According to a fifth aspect of the present invention, in the antenna according to any one of the first to fourth aspects, at least a radome that houses the radiation conductor and the reflective conductor is provided.

According to the invention of claim 6 , in the antenna for a wall surface used by being attached to the wall surface of the building facing the arrival direction of the desired wave, the antenna is the antenna according to any one of claims 1 to 5. Configured.

The antenna according to any one of claims 1 to 6 is configured for digital terrestrial broadcasting.

According to the present invention, the one side the distal end portion of the radiating conductor inclined by a first predetermined angle forward or rear direction of the antenna, even in a state having a beam tilt, reflection conductor rather substantially shaped songs folding Jo rising, because the shorter projecting dimension of the front direction of the whole antenna, not only the antenna pillar or veranda, refreshing and disposed discreetly for installation in a wall surface of such buildings veranda or the like is not installed It becomes an antenna that can . In addition , it is versatile enough to handle a wide range of radio wave arrival directions . Further, by combining with the attachment means , it is possible to cope with a wider range of radio wave arrival directions.

In particular, it is possible to easily adjust the direction of the antenna for both radio waves coming from the direction facing the wall of the building and radio waves coming from the left and right directions within a predetermined range. For example, this antenna is used for the UHF band. If the antenna of this type is used, good characteristics can be obtained in a wide band of ch13 (470 MHz) to ch62 (770 MHz) with or without a beam tilt. An antenna suitable for a wall surface of a building or the like can be provided . Then, to be beam tilt forming, since it is configured to in response to the swinging of the radiating conductor inclined half of reflection conductors, as compared with the antenna configured direct the entire antenna DOA, antenna strut It is possible to provide an antenna that can be installed in a low-profile manner, with a small dimension protruding from the wall, veranda, and wall surface, is inexpensive to install, and is inconspicuous .

According to the invention of claim 2, it is possible to configure a rectangular parallelepiped shape plate member without oblong protrusion, the protrusion part without as a thin element as Yagi-Uda antenna A, easy to assemble It becomes.

According to the invention of claim 3 , at least the radiation conductor can be simplified simply by punching a metal plate or the like, and the assembly is simplified.

According to the invention of claim 4, because with the attachment means, not only the antenna support mast or veranda, with attachment of the antenna is facilitated with respect to the wall surface, such as a building, in addition to the beam tilt with the antenna itself As a result, the applicable range of the antenna mounting direction is widened, and optimal reception is possible for a wide range of radio wave arrival directions.

According to the invention of claim 5 , since the radome is provided, not only the durability is improved, but also it is not conspicuous even if it is attached to an antenna column or a veranda or a wall surface of a building to be attached. It can be an antenna.

According to the invention of claim 6 , in the antenna for a wall surface used by being attached to the wall surface of the building facing the arrival direction of the desired wave, the antenna is the antenna according to any one of claims 1 to 5. Since it is configured, the forward projecting dimension of the antenna is short, and it can cope with a wide range of radio wave arrival directions, so it is excellent as an antenna for wall mounting.

Antenna according to any one of claims 1 to 6 so configured as a terrestrial digital broadcast, taking advantage of the characteristics of digital broadcasting, it is possible to provide a simple and reliable can receive terrestrial digital broadcasting antenna .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, a UHF band antenna will be described as a preferred example of the present invention. FIG. 1 is a schematic perspective view showing a first embodiment of a UHF antenna according to the present invention. FIG. 2 is a front view of the radiation conductor according to the present invention. FIG. 3 is a top view of FIG. FIG. 4 is a perspective view showing a specific example of the first embodiment, (a) is a perspective view provided with a wall surface mounting member, and (b) is a perspective view when a radome is provided. FIG. 5 is a perspective view in the case where a wall mounting bracket is provided on the back surface of the reflective conductor in the first embodiment. FIG. 6 is a perspective view showing a specific example of the second embodiment according to the present invention, and FIG. 7 is a schematic diagram for explaining a method of changing the angle between the radiation conductor and the reflection conductor of FIG. a) shows a state when a beam tilt of about 20 ° is formed in the left direction, (b) shows a state when no beam tilt is formed, and (c) shows a beam tilt of about 20 ° in the right direction. The state when formed is shown. 8A is a top view, and FIG. 8B is a side view when a wall mounting bracket is provided on the back surface of the reflective conductor in the second embodiment. FIG. 9 shows the characteristics of the antenna in the state of FIG. 7 (a), where (a) shows the operating gain, (b) shows the VSWR, (c) shows the front-to-back ratio, and (d) shows the half-value angle. FIG. 10 shows the characteristics of the antenna in the state of FIG. 7 (b), where (a) shows the operating gain, (b) shows the VSWR, (c) shows the front-to-back ratio, and (d) shows the half-value angle. FIG. 11 is a horizontal polarization direction performance chart in ch13, where (a) shows the performance of the antenna of FIG. 7 (a) and (b) shows the performance of the antenna of FIG. 7 (b). FIGS. 12A and 12B are horizontal polarization horizontal plane performance charts for ch38. FIG. 12A shows the performance of the antenna of FIG. 7A, and FIG. 12B shows the performance of the antenna of FIG. 13A and 13B are horizontal polarization horizontal plane performance charts for ch 62, where FIG. 13A shows the performance of the antenna of FIG. 7A and FIG. 13B shows the performance of the antenna of FIG.

FIG. 1 is a schematic perspective view for explaining a first embodiment of a UHF antenna according to the present invention. In the following description, a direction line connecting the center point of the reflective conductor 2 and the center point of the radiating conductor 1 (A-A line in the figure, hereinafter referred to as A-A line) unless otherwise specified. )) As a reference, the radiation conductor 1 side is shown in front, and the horizontal direction with respect to the line AA is shown on the left and right.
The radiation conductor 1 shown in the first embodiment is a rectangular antenna body that transmits or receives radio waves, and has a central left-right axial direction (BB line in the figure; hereinafter referred to as BB line). A long window 3 is formed by punching, and a feeding point 4a is formed at a projecting tip portion projecting from a substantially central portion of the left and right wall portions of the opening window 3 toward the center point of the radiation conductor.
FIG. 2 shows an example of the dimensions of each part. According to the embodiment of the present invention, for example, the width W of the radiation conductor is 200 mm and the height H is 170 mm, the height L1 of the window is 110 mm, and the width L2 is 160 mm. Further, the protrusion 4 of the feeding point 4a has a width of 50 mm and a length of 75 mm. Note that these dimensions are such that the reception or transmission frequency is λ, the width W is 0.25λ to 0.62λ, the height H is 0.21λ to 0.52λ, and the window length L1 is 0.15λ to 0. 3λ and the width L2 of the window are preferably 0.2λ to 0.5λ. Here, the dimensions are shown in which λ is 470 MHz to 770 MHz, which is the entire UHF band.
The radiating conductor 1 shown in this embodiment is one embodiment, and the radiating conductor 1 is limited to the embodiment as long as the radiating conductor 1 can be easily formed by simply punching a plate or the like. Is not to be done.

The reflective conductor 2 is formed in a substantially square shape larger than the radiating conductor 1 and is disposed behind the radiating conductor 1 so that the center point is substantially on the same axis. Further, the reflection conductor 2 is composed of reflection conductor portions 21 and 22 positioned on both sides of the bent portion 20 with the vertical direction line orthogonal to the left-right direction line as a bent portion 20. The reflection conductors 21 and 22 are on the other side of the bent part 20 with respect to the horizontal axis (DD line in the figure, hereinafter referred to as DD line) of the reflection conductor part 21 on one side. The left-right direction axis line (EE line in the figure; hereinafter referred to as EE line) of the reflective conductor portion 22 of the reflective conductor portion 22 is substantially square-shaped by a first predetermined angle θ1 toward the front of the antenna. It is formed so as to be bent.
For example, the height is 250 mm and the width is 350 mm. These dimensions are preferably set such that the height is 0.31λ to 0.77λ and the width is 0.44λ to 1.08λ when the reception or transmission frequency is λ. The radiation conductor 1 and the reflection conductor 2 are arranged with an interval of 0.07λ to 0.19λ, for example, 60 mm.

As shown in the top view of the mounting state of the radiation conductor 1 and the reflection conductor 2 in FIG. 3, the reflection conductor 2 is the reflection conductor 2 in a state where the radiation conductor 1 and the reflection conductor 2 are arranged. Is attached so that the DD line of the reflective conductor portion 21 on one side is orthogonal to the AA line connecting the center point of 2 and the center point of the radiation conductor 1. The BB line, which is the left-right axis, is tilted so as to be parallel to the EE line, which is the left-right axis of the reflection conductor 22 on the other side (that is, CC perpendicular to the A-A line). The BB line is attached to the line so as to be θ1.

In the present invention, the radiating conductor 1 and the reflecting conductor 2 are formed by pasting a conductive sheet on a dielectric support material and then punching the window as a through-hole. The mesh plate may be formed by punching a window or the like. The radiating conductor 1 and the reflecting conductor 2 formed in this way may be fixed to a radome that houses the radiating conductor 1 and the reflecting conductor 2 made of resin, or the center point of the radiating conductor 1 and the reflecting conductor 2. The supporting method is not particularly limited, for example, it may be formed so as to penetrate through the central point of the wire and be fixed to a support rod for supporting the radiation conductor 1 and the reflection conductor 2. Alternatively, the radiation conductor 1 and the reflection conductor 2 can be directly formed by metal plating the resin box. Further, a slit-like window can be formed on a circuit board or the like and fixed to a support material.

FIG. 4A shows an example of the antenna 101 provided with the wall surface mounting member 5 behind the reflection conductor 2 of the antenna configured as described above. The wall surface attaching member 5 is formed in a plate shape having rigidity made of, for example, a synthetic resin or a metal body, and is a member for attaching the antenna to a wall surface of a building or the like. In the embodiment of the present invention, the radiation conductor 1 and the reflection conductor 2 are arranged at a predetermined interval on a support rod 10 protruding forward from a substantially central portion of the wall surface mounting member 5. Consists of composition. The feeding line not shown in the drawing connected to the antenna feeding point 4a may be configured so as to be drawn out from the rear of the wall surface mounting member through the inside of the support rod 10, and its method is particularly limited. It is not a thing. Further, when mounting on the wall surface, the antenna may be mounted and fixed by screwing a screw rod not shown in the figure to the wall surface through the screw holes 5a. The present invention is not limited to the examples.
Further, as shown in FIG. 4B, at least a radome 8 that covers the radiation conductor 1 and the reflection conductor 2 may be an antenna 102 that can be detachably fixed to the wall surface mounting member 5.

FIG. 5A shows an example of an antenna 103 provided with a wall mounting bracket 15 behind the reflective conductor 2. The wall mounting bracket 15 includes a base 16 for mounting and fixing to a wall 40 to be mounted, and a sliding bracket 19 projecting behind the reflecting conductor 2. A bent piece 17 is formed on the upper and lower ends of the central portion of the base body 16 by bending it in the direction of the reflective conductor 2 integrally with the base body 16. The bent piece 17 and the sliding fitting 19 are attached. As shown in FIG. 5B, the sliding bracket 19 (that is, the antenna) is fixed to the rotating shaft and the fixed member so that it can swing continuously by the second predetermined angle θ2 in the left-right direction. By attaching the screw rod 18 as a means in the vertical direction, the mounting angle can be variably fixed. Reference numeral 14 denotes a screw rod for fixing the wall surface mounting bracket 15 to the wall surface.
Incidentally, a mounting means according to the wall mounting bracket 15 claims shown in this embodiment, the attachment means is not limited to the particular embodiments may be realized in other ways. Further, it goes without saying that the wall mounting member 15 shown in this embodiment may be provided behind the wall mounting member 5 shown in FIG.

Thus, the directivity characteristics of the configured antenna have a beam tilt characteristic in which the beam is inclined by approximately θ1 with respect to the AA line connecting the center point of the radiation conductor 1 and the center point of the reflection conductor 2. Antenna is configured. In other words, this antenna can be configured with two horizontally long rectangular parallelepiped plates without protrusions, so there are no protrusions like small elements like Yagi and Uda antennas, and assembly is easy. In addition, even if it is configured to have a beam tilt, the forward projecting dimension can be shortened, so that not only antenna posts and verandas but also walls such as buildings where verandas are not installed. It is an antenna suitable for wall installation that can be placed neatly without conspicuous installation.
Furthermore, by providing the wall mounting bracket 15, in addition to the beam tilt θ1 of the antenna itself, the second predetermined angle θ2, which is the angle adjustment range of the wall mounting bracket 15, can be adjusted. Even if it is installed on the wall, the antenna installation direction can be optimally matched to the direction of arrival of radio waves.
In addition, if these antennas are configured to be mounted upside down, the beam tilt of the antenna itself is tilted by θ1 in the opposite direction with respect to the AA line, so that a wider range. Versatile enough to handle the direction of arrival of radio waves. Further, by combining with the wall mounting bracket 15, it is possible to cope with a wider range of arrival directions of radio waves.

Next, a second embodiment of the antenna of the present invention will be described with reference to FIG. In the following description, the same components as those of the antenna of the first embodiment are given the same reference numerals, and detailed description thereof is omitted.

In FIG. 6, reference numeral 105 is a perspective view schematically showing the antenna of the second embodiment. In this embodiment, the radiation conductor 1, the mounting direction with swingably fixed at a first range of predetermined angle θ1 in the left-right direction with respect to the line C-C perpendicular to the line A-A, its rocking Corresponding to the movement, the mounting direction of the reflecting conductor portion 21 or the reflecting conductor portion 22 constituting the reflecting conductor 2 can be changed so that the angle formed by each of the left and right axis lines can be changed. By providing the antenna with movable means for performing the above, a beam tilt of a predetermined angle can be formed in the directivity of the antenna.

Here, the details of the movable means and the manner in which the mounting directions of the radiation conductor 1 and the reflective conductor 2 are manipulated by the movable means will be described with reference to FIG. In this embodiment, the reflection conductor 2 is composed of a reflection conductor portion 21 and a reflection conductor portion 22 connected by one or a plurality of connecting members 35 made of a conductive material at the center thereof. The reflecting conductor portion 22 is connected to the connecting member 35 so as to be bent from a horizontally arranged state so as to have a substantially square shape. The radiating conductor 1 is configured to be swingable about the central axis 1a of the radiating conductor 1 as a rotation axis, and as shown in this figure, the reflections of the two end portions 11 and 12 of the radiating conductor 1 and the reflecting conductor 2 are reflected. The conductor portions 21 and 22 are connected by connecting means 31 and 32, respectively.
In addition, although there exists a hinge as an example of the said connection member, you may comprise with the electrically conductive material which has elasticity. For example, when the reflection conductor portion constituting the reflection conductor 2 is integrally formed from a flexible film-like elastic material provided with a conductive material, the connecting member for connecting the reflection conductor portions is an elastic material. In this case, the elastic material itself is a connecting member, which is a bent portion for bending the reflective conductor portion into a substantially square shape.

FIG. 7A is a schematic cross-sectional view seen from the upper surface side when the right end portion 12 of the radiation conductor 1 is inclined by a first predetermined angle θ1 toward the front side of the antenna.
First, the connecting means 32 will be described. The connecting means 32 is pivotally mounted at a substantially central portion 32a so that the central portion 32a is inwardly foldable, and is configured to be substantially square when it is fully opened as shown in the figure. Has been. The connecting means 32 has one end pivotally attached to the radiating conductor tip 12 and the other end via an insertion hole 22b formed in the reflecting conductor 22. The part 22 is fixed to a pivot point 22a on the back side of the part 22 so as to be pivotable. On the other hand, a spring 38 made of an elastic member is interposed between the back side of the reflective conductor portion 22 and the wall surface attachment member 5, and the reflection conductor portion 22 is attached to the wall surface attachment member 5 by the biasing force of the spring 38. It consists of an energized composition. That is, when the radiating conductor 1 is tilted so that the front end portion 12 thereof is in the front direction of the antenna, the reflecting conductor portion 22 is urged toward the wall surface mounting member 5 by the spring 38 and the connecting means 32 moves the front direction of the antenna. Be drawn to. At this time, the length of the connecting means 32 is determined so that the horizontal line BB of the radiating conductor 1 and the horizontal line EE of the reflective conductor 22 are substantially parallel.
The connecting means 31 has the same configuration and its details are omitted for the sake of simplicity. In FIG. 7A, the connecting means 31 is in a closed state, and the reflecting conductor portion 21 is a biasing force of the spring 37. Is attracted in the direction of the wall surface mounting member 5.

Next, in FIG. 7B, the radiation conductor 1 is a schematic cross-sectional view seen from the upper surface side when it is substantially parallel to the wall surface mounting member 5, and the radiation conductor 1 is viewed from the state of FIG. 5 is returned to a position substantially parallel to 5. Accordingly, the reflecting conductor portion 22 is pulled back to the wall surface mounting member 5 side by the biasing force of the spring 38. By the way, as shown in the figure, an abutting portion 52 projecting from the attaching member 5 is formed on the inner surface of the wall surface attaching member 5, and the reflecting conductor portion 22 abuts on the tip of the abutting portion. It is pulled back to the state. The abutting portion 52 is formed so as to protrude forward from the wall surface mounting member 5 so as to be disposed substantially parallel to the wall surface mounting member 5 in a state where the reflecting conductor portion 22 is in contact.
On the other hand, since the other end portion 11 moves in the forward direction due to the swinging of the radiation conductor 1, the connecting means 31 in the bent state is gradually opened while being pulled in the forward direction. In the state, it is in the maximum open state. In this state, the radiation conductor 1, the reflection conductor 2, and the wall surface mounting member 5 are arranged substantially in parallel, that is, the antenna does not form a beam tilt.

Next, FIG. 7C is a schematic cross-sectional view seen from the upper surface side when the left end portion 11 of the radiation conductor 1 is inclined forward by a first predetermined angle θ1.
When the left end portion 11 of the radiating conductor 1 moves further forward, the connecting means 31 is in the fully open state. Therefore, the connecting means 31 causes the reflecting conductor portion 21 to move forward against the urging force of the spring 37. The radiating conductor 1 is attracted in the direction and tilted forward by a predetermined angle. Further, although the right end portion 12 of the radiating conductor 1 moves to the reflecting conductor portion 22 side, the connecting means 32 is closed at the substantially central portion 32a and does not limit the swinging of the radiating conductor 1. As described above, the configuration of the second embodiment can provide an antenna having two states: a state in which no beam tilt is formed and a state in which a beam tilt is formed.
In the second embodiment of the present invention, at least the connecting means 31, 32及and constitute a movable unit between said spring 37 and 38, the direction of the movable means radiating conductor 1 and the reflection conductor 2 The adjustment may be performed continuously or the direction may be adjusted stepwise. Further, as shown in FIG. 8, also in the second embodiment, a wall surface mounting bracket 15 may be provided on the back surface of the reflective conductor. In this figure, (a) is a top view when attached to the wall surface, (b) is a side view when attached to the wall surface, and 9 shown in this figure is an operation knob for operating the movable means. is there. In the second embodiment, the connecting member 35 may be made of an elastic material having a spring property. In this case, in addition to the urging force by the spring, the urging force by the connecting member is added to the reflecting conductor portion. Will be.

Here, the characteristics of the antenna in the second embodiment are shown in FIGS. 9A and 9B show frequency characteristics when a beam tilt of about 20 ° is formed in the left direction shown in FIG. 7A. FIG. 9A shows an operating gain, FIG. 9B shows a standing wave ratio, and FIG. Ratio, (d) shows each characteristic of the half-value angle. FIG. 10 shows frequency characteristics when the beam tilt shown in FIG. 7B is not formed. (A) is the operating gain, (b) is the standing wave ratio, (c) is the front-to-back ratio, and (d). Indicates each characteristic of the half-value angle. Further, FIGS. 11 to 13 are horizontal polarization horizontal plane performance charts at ch13, ch38, and ch62, respectively. FIGS. 11 (a), 12 (a), and 13 (a) are the left side of FIG. 7 (a). FIG. 11B is a horizontal polarization directivity performance diagram when a beam tilt of approximately 20 ° is formed in the direction, and FIGS. 11B, 12B, and 13B show the beam tilt of FIG. 7B. It is a horizontal polarization horizontal plane directivity performance figure in the case of not forming.

As described above, according to the antenna of the second embodiment shown in FIG. 6, any one of the reflection conductors constituting the reflection conductor 2 corresponding to the oscillation of the radiation conductor 1 and the oscillation of the radiation conductor 1. By configuring the mounting angle of the part to be variable, it is possible to easily cope with radio waves coming from the direction facing the wall of the building as well as radio waves coming from a direction deviated by a predetermined range in the left-right direction. And in the wide band of ch13 (470 MHz) to ch62 (770 MHz), each can have good characteristics regardless of whether or not beam tilt is formed. An antenna suitable for a wall surface can be provided.
Further, in order to form the beam tilt, only half of the reflecting conductor 2 is tilted corresponding to the swinging of the radiating conductor 1 so that all of the antenna itself is directed in the direction of arrival of radio waves. Since the projecting dimension from the wall surface is shorter than that of the provided antenna, it is possible to provide a wall mounting antenna that is inexpensive to attach to the wall surface and is inconspicuous.

Furthermore, as well shown in FIG. 8, by attaching the wall mounting bracket 15 to the back surface of the antenna, not only can it be easily mounted on the wall 40 of the building, but also the direction adjustment (θ2 ), The antenna can handle a wider range of arrival directions.

In addition, this invention is not limited to the said 1st and 2nd embodiment, The structure is not limited to an Example so that it may illustrate below.
In the above-described embodiment, a specific example of a UHF antenna for receiving terrestrial digital broadcasting has been shown as a preferred example of the embodiment of the present invention. However, the embodiment is not particularly limited to an antenna that receives a radio wave in the UHF band. You may apply to the antenna of another frequency band.
Moreover, although the example provided with the wall surface attachment member 5 and the wall surface attachment metal fitting 15 separately was shown, a part of wall surface attachment member and a wall surface attachment metal fitting may be shared, and you may comprise as one member.
Further, as shown in the figure, the radiation conductor 1 is attached to the tip end portion of the support rod 10, but is not particularly limited to this embodiment. It may be attached to a support piece not shown in the figure folded in the direction, and the radiating conductor 1 and the reflecting conductor 2 may be arranged at a predetermined interval.
In the second embodiment of the present invention, the method of adjusting the mounting direction by interlocking the radiating conductor 1 and the reflecting conductor 2 using a movable means has been described. However , each part is not deviated from the scope of the present invention. It is also possible to change the configuration as appropriate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically illustrating a first embodiment of an antenna according to the present invention. It is a front view of the radiation conductor concerning this invention. FIG. 2 is a top view of FIG. 1. It is a perspective view which shows the specific example of 1st Embodiment, (a) is a perspective view provided with the wall surface attachment member, (b) is a perspective view at the time of providing the radome. (A) shows the perspective view at the time of providing a wall surface mounting bracket in the back of a reflective conductor in 1st Embodiment. (B) is a top view for showing the direction adjustment range (second predetermined angle θ2) by the wall surface mounting bracket. It is a perspective view which shows the specific example of 2nd Embodiment concerning this invention. It is a schematic diagram for demonstrating the method of changing the angle of a radiation | emission conductor and a reflective conductor, (a) shows the state when the beam tilt of about 20 degrees is formed in the left direction, (b) is beam tilt. (C) shows a state when a beam tilt of approximately 20 ° is formed in the right direction. In 2nd Embodiment, (a) at the time of providing a wall surface mounting bracket in the back surface of a reflective conductor is a top view, (b) is a side view. 7A shows the characteristics of the antenna in the state of FIG. 7A, where FIG. 7A shows the operating gain, FIG. 7B shows the VSWR, FIG. 7C shows the front-to-back ratio, and FIG. The characteristics of the antenna in the state of FIG. 7B are shown, (a) shows the operating gain, (b) shows the VSWR, (c) shows the front-to-back ratio, and (d) shows the half-value angle. It is a horizontal polarization horizontal plane directivity performance figure in ch13, (a) is the antenna of Drawing 7 (a), and (b) is the performance of the antenna of Drawing 7 (b). It is a horizontal polarization horizontal plane directivity performance diagram in ch38, (a) is the antenna of FIG. 7 (a), (b) is the performance of the antenna of FIG. 7 (b). It is a horizontal polarization horizontal plane directivity performance figure in ch62, (a) is the antenna of Drawing 7 (a), and (b) is the performance of the antenna of Drawing 7 (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Radiation conductor, 1a ... Center axis, 2 ... Reflection conductor, 3 ... Opening window, 4 ... Projection part, 4a ... Feeding point, 5 ... Wall surface attachment member, 5a ... Insertion hole, 8 ... Radome, 9 ... Operation knob, DESCRIPTION OF SYMBOLS 10 ... Support rod, 11 * 12 ... Tip part, 14 ... Screw rod, 15 ... Wall mounting bracket, 16 ... Base | substrate, 17 ... Bending piece, 18 ... Screw rod, 19 ... Sliding bracket, 20 ... Bending part, 21 ... one reflective conductor part, 22 ... the other reflective conductor part, 21a, 22a ... pivoting part, 21b, 22b ... insertion hole, 31 * 32 ... connecting means, 31a * 32a ... central part, 35 ... connecting member, 37.38 ... Spring, 40 ... Wall surface, 51.52 ... Abutting part, 101.102.103.105 ... Antenna

Claims (7)

In an antenna comprising at least a rectangular radiating conductor and a substantially rectangular reflecting conductor disposed behind the radiating conductor,
The reflection conductor, a vertical line perpendicular to the lateral axis as a bent portion, which has two reflective conductor portions arranged on left and right sides than the folded portions, foldably by the bent portion And
The radiating conductor has an axis line extending from the central point of the radiating conductor to one of the left and right tip portions of the radiating conductor, and the central point of the radiating conductor and the central point of the reflective conductor. It is configured to be able to swing within a first predetermined angle range from a position orthogonal to the front-rear direction line, which is a connecting direction line, in the front direction and the rear direction of the antenna.
In addition,
Both ends of the radiating conductor are connected to the one end of the radiation conductor and one of the two reflecting conductors, one of the two reflecting conductors, which is the reflecting conductor on the rear side of the one end of the reflecting conductor. And the connecting means on one side for changing the distance between the one end of the radiation conductor and the one side reflecting conductor by changing the distance between both ends thereof,
Of the left and right tip portions of the radiating conductor, the other tip portion opposite to the one tip portion, and the reflection of the two reflecting conductor portions on the rear side of the other tip portion Both ends are connected to the other-side reflection conductor portion, which is a conductor portion, and the distance between the opposite ends of the radiation conductor is changed by changing the separation distance between the both ends. Connecting means on the other side to be
With
When the radiating conductor is positioned so that its left-right axis is substantially perpendicular to the front-rear direction line, the distance between both ends of the two connecting means is maximized in the variable range. The horizontal axis of the side reflective conductor and the horizontal axis of the other reflective conductor are in a straight line substantially parallel to the horizontal axis of the radiation conductor,
The one end of the radiating conductor is inclined toward the front of the antenna by the first predetermined angle, and an angle formed between a horizontal axis of the radiating conductor and a direction perpendicular to the front-rear direction line is set to the first direction. The distance between both ends of the one-side connecting means becomes the maximum and the distance between both ends of the other-side connecting means becomes smaller than the maximum, so that the reflective conductor becomes , and bent at the bent portion, the said one substantially parallel lateral axis of the side reflecting conductor portion and the lateral axis of the radiation conductor, and the other side the longitudinal direction line is lateral axis of the reflection conductor portion It becomes a nearly square shape that is almost orthogonal,
The one end of the radiating conductor is inclined toward the rear of the antenna by the first predetermined angle, and an angle formed between a horizontal axis of the radiating conductor and a direction perpendicular to the front-rear direction line is set to the first direction. When the predetermined angle is set, the distance between both ends of the other-side connecting means becomes the maximum, and the distance between both ends of the one-side connecting means becomes smaller than the maximum. , and bent at the bent portion, on the other side reflecting conductor portion of the lateral axis is substantially parallel to the lateral axis of the radiation conductor, and the one the longitudinal direction line is lateral axis of the side reflecting conductor portion It becomes a nearly square shape that is almost orthogonal,
An antenna characterized by being configured as follows. The radiation conductor has a substantially rectangular radio wave radiation surface, and has an opening window extending in the left-right direction at a substantially central portion, from a substantially central portion of the left and right wall portions of the opening window to a center point of the radiation conductor. The antenna according to claim 1, wherein a feeding point is formed at a protruding tip portion protruding toward the antenna. When the reception or transmission wavelength is λ, the horizontal width of the radiation conductor is 0.25λ to 0.62λ, the height is 0.21λ to 0.52λ, and the distance between the radiation conductor and the reflection conductor is 0.07λ to The antenna according to claim 2, which is 0.19λ . An attachment means for an attachment object is provided on the back of the reflective conductor, and the attachment means has a front-rear direction line within a second predetermined angle range from the same direction as the direction line orthogonal to the attachment object in the left-right direction. The antenna according to any one of claims 1 to 3, wherein the antenna is configured to be continuously variable and fixed . The antenna according to any one of claims 1 to 4 , further comprising a radome that accommodates at least the radiation conductor and the reflection conductor . In the antenna for the wall used by attaching to the wall of the building facing the direction of arrival of the desired wave,
  The antenna for a wall surface, comprising the antenna according to any one of claims 1 to 5. The antenna according to any one of claims 1 to 6, wherein the antenna is for digital terrestrial broadcasting.

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