JP2006222715A - Antenna assembly and receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna assembly as a slot antenna used as an indoor antenna for a television receiver for receiving digital terrestrial broadcasting capable of changing the directivity of an antenna without changing practically frequency characteristics as the antenna, and being separately independent to the direction of the screen of the receiver, and without changing the shape and the capacity of the whole antenna assembly considerably. <P>SOLUTION: A radiator 10 comprises a curvature plate 11 at which a slot 12 is formed, flips 13 and 14 located at both sides of the plate, and slide plates 15 and 16 slidable to a cross direction perpendicular to a plane of the slot 12 in relation to the flips 13 and 14. A mechanism for sliding the slide boards 15 and 16 by the same width to mutually reverse direction in relation to the flips 13 and 14 is provided as an operating mechanism 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an antenna device used as an indoor antenna for a television receiver for receiving digital terrestrial broadcasting, and a receiver incorporating the antenna device.

  As a slot antenna that can be built into a portable terminal or a wall, Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-283232) discloses that a slot is formed by cutting a flat, curved, or cylindrical conductor plate, A plate antenna is shown in which two radiating conductors are formed with the central axis of the slot as a boundary, and power is fed by the two opposing conductor edges.

  Further, Patent Document 2 (Japanese Patent Application Laid-Open No. 2003-332934) discloses a flat plate or arcuate positive plate of a U-shaped or U-shaped conductor plate composed of a front plate portion and left and right side plate portions. A slit is formed in the vertical direction on the face plate part to form a notch antenna for horizontal polarization, a slot is formed in the horizontal direction across the front plate part and the left and right side plate parts of the same conductor plate, and the vertical polarization It is shown that a slot antenna is formed.

The prior art documents listed above are as follows.
JP 2003-283232 A JP 2003-332834 A

  However, the conventional slot antenna is used as, for example, an indoor antenna for a television receiver that receives digital terrestrial broadcasting, and in order to change the directivity, it is necessary to change the direction of the radiator itself, that is, the direction of the slot. .

  Therefore, the directivity of the antenna cannot be changed when the direction of the radiator itself cannot be changed, such as when the antenna device is attached to the wall surface of the room. Also, when the antenna device is housed in the receiver housing, the direction of the receiver itself must be changed in order to change the antenna directivity, which also changes the orientation of the screen. , It is inconvenient that the screen is difficult to see, or that the user must move to make the screen easier to see.

  Therefore, the present invention is a slot antenna used as an indoor antenna for a television receiver for receiving terrestrial digital broadcasts, with almost no change in frequency characteristics as an antenna, and independent of the screen orientation of the receiver. In addition, the directivity of the antenna can be changed without greatly changing the shape and volume of the entire antenna device.

The antenna device of the present invention is
A radiator including a central plate portion in which a slot is formed, and first and second side plate portions provided to extend on both sides of the central plate portion;
An operation mechanism for expanding and contracting the first and second side plate portions without changing the entire area of the radiator,
Is provided.

  In the antenna device of the present invention having the above-described configuration, without changing the entire area of the radiator composed of the central plate portion and the first and second side plate portions, and therefore, hardly changing the frequency characteristics as the antenna, The ratio of the width (area) of one side (left side) of the radiator slot to the width (area) of the opposite side (right side) can be changed, and the directivity of the antenna can be changed.

  In addition, when used as an indoor antenna for a television receiver, the antenna directivity is changed independently of the screen orientation, regardless of whether the antenna device is housed in the receiver housing or installed outside the receiver. Can be set freely in a direction that allows easy viewing of the screen.

  Furthermore, even if the antenna directivity is changed, the shape and volume of the antenna device as a whole do not change significantly.Therefore, even when the flat-screen TV receiver is fixedly attached to the wall surface of the room and the screen orientation of the receiver is fixed. The directivity of the antenna can be changed without changing the outer shape of the receiver housing in a state where the antenna device is housed in the receiver housing.

  As described above, according to the present invention, the slot antenna used as an indoor antenna for a television receiver that receives terrestrial digital broadcasts has almost no change in frequency characteristics as an antenna, and the orientation of the receiver screen. The directivity of the antenna can be changed independently of the antenna device and without greatly changing the shape and volume of the entire antenna device.

[1. Example of antenna device: FIGS. 1 to 6]
FIG. 1 shows an example of an antenna device of the present invention.

  The antenna device of the present invention includes a radiator 10 as a slot antenna and an operation mechanism 20.

  In this example, the radiator 10 includes a curved plate 11, flips (side plates) 13 and 14, and slide plates 15 and 16.

  The curved plate 11 is a semi-cylindrical conductor made of a copper foil sheet, a copper foil attached on an insulating plate, or the like, and extends in the vertical direction at the center of the curved direction (circumferential direction). A slot (radiation port) 12 is formed.

  Each of the flips 13 and 14 is a flat conductor made of a copper foil sheet or a copper foil stuck on an insulating plate. The flip 13 is a left side edge of the curved plate 11, and the flip 14 is The curved plate 11 is formed integrally with the curved plate 11 at the right side edge of the curved plate 11.

  In practice, the curved plate 11 and the flips 13 and 14 are formed as a single conductor plate, and after the formation, the central portion is bent into a semi-cylindrical shape to form the curved plate 11, and the left and right portions are parallel to each other. The flips 13 and 14 are opposed to each other.

  Similarly to the flips 13 and 14, the slide plates 15 and 16 are flat conductors made of a copper foil sheet or a copper foil affixed on an insulating plate, respectively. 14 and the curved plate 11 are formed separately from each other, and arranged so as to be slidable in the front-rear direction perpendicular to the plane of the slot 12 with respect to the flips 13 and 14 in contact with the flips 13 and 14.

  In the radiator 10 including the curved plate 11, the flips 13 and 14, and the slide plates 15 and 16, the left and right side edge points 17 and 18 facing each other through the slot 12 of the curved plate 11 are used as feeding points. For example, when the coaxial line is an antenna feed line, the inner conductor (or outer conductor) at one end of the coaxial line is connected to the feed point 17 and the outer conductor (or inner conductor) is connected to the feed point 18. .

  The operation mechanism 20 slides the slide plates 15 and 16 by the same width in the opposite directions with respect to the flips 13 and 14, and in this example, the boom guides 21 and 22, the boom (arm) 23, An operation shaft 24 and a handle 25 are included.

  The boom guides 21 and 22 are each formed of an insulating plate and attached to the slide plates 15 and 16 by bonding, screwing, or the like. The boom guides 21 and 22 are formed with holes 21e and 22e, respectively.

  The boom 23 is passed to the boom guides 21 and 22 by inserting the left end portion and the right end portion thereof into the holes 21e and 22e of the boom guides 21 and 22, respectively. Although not shown in the drawing, on the outside of the boom guides 21 and 22, stoppers for preventing the boom 23 from dropping off are attached to the left end and the right end of the boom 23.

  The operation shaft 24 is formed integrally with the boom 23 or attached to the boom 23 at the center of the boom 23.

  The handle 25 rotates the operation shaft 24 and the boom 23 as operation means, and is formed integrally with the operation shaft 24 or attached to the operation shaft 24.

  The height (length) of the curved plate 11, the flips 13 and 14, and the slide plates 15 and 16 are all the same, as indicated by “H” in FIG. The widths of the flips 13 and 14 are also the same, and the widths of the slide plates 15 and 16 are also the same.

  FIG. 1 and FIG. 3C show the width of the flip 13 and the slide plate 15 combined (the width obtained by subtracting the width of the overlapping portion from the sum of the width of the flip 13 and the width of the slide plate 15) La. And the width corresponding to the sum of the flip 14 and the slide plate 16 (the width obtained by subtracting the width of the overlapping portion from the sum of the width of the flip 14 and the slide plate 16) Lb, that is, The area of the left portion of the slot 12 of the radiator 10 and the area of the right portion of the slot 12 are equal. At this time, the antenna directivity is the front direction of the slot 12 as indicated by an arrow 1c. It becomes.

When the radius of the curved plate 11 is r and the width (circumferential length) of the curved plate 11 is Lc (= π × r), the area S of the entire radiator 10 is
S = (Lc + La + Lb) H (1)
It is represented by

  In the antenna apparatus of the example of FIG. 1, when the handle 25 is turned clockwise or counterclockwise from this state, the boom 23 moves in conjunction with it, and the boom guides 21 and 22 are pushed in opposite directions. The slide plates 15 and 16 are slid by the same width in opposite directions, and the width La corresponding to the flip 13 and the slide plate 15 is combined, and the width Lb corresponding to the flip 14 and the slide plate 16 is combined. The sum of the two (La + Lb) can be changed in a constant state, that is, the area of the left part of the slot 12 of the radiator 10 and the area of the right part of the slot 12 are the sum of the two. It can be changed while the area S of a certain radiator 10 is kept constant, and the directivity of the antenna can be changed.

  That is, when the handle 25 is rotated clockwise by a certain angle from the state shown in FIGS. 1 and 3C, the slide plate 15 is removed from the slot 12 as shown in FIGS. 2A and 3A. Slide by a certain width in the direction of leaving, slide by the same width in the direction in which the slide plate 16 approaches the slot 12, and La> Lb, and the area of the left part of the slot 12 of the radiator 10 is the slot 12 is larger than the area of the right part of the antenna 12, and the directivity of the antenna is in the direction of the flip 13 from the front direction of the slot 12 as indicated by an arrow 1a. However, at this time, the sum width (La + Lb) does not change, and the area S of the entire radiator 10 does not change, so the frequency characteristics as an antenna hardly change.

  On the contrary, when the handle 25 is turned counterclockwise by a certain angle from the state shown in FIGS. 1 and 3C, the slide plate 15 is inserted into the slot as shown in FIGS. 2B and 3B. 12 slides by a certain width in the direction approaching 12, and slides by the same width in the direction away from the slot 12, so that La <Lb, and the area of the right side portion of the slot 12 of the radiator 10 is Since the area of the left portion of the slot 12 is larger, the directivity of the antenna is in the direction closer to the flip 14 than the front direction of the slot 12 as indicated by an arrow 1b. However, at this time, the sum width (La + Lb) does not change, and the area S of the entire radiator 10 does not change, so the frequency characteristics as an antenna hardly change.

  Each of the slide plates 15 and 16 prevents a gap from being formed between the flip plates 13 and 14 even when the slide plates 15 and 16 are farthest from each other. To.

  In order to regulate the sliding range of the slide plates 15 and 16 and to smoothly slide the slide plates 15 and 16, it is desirable to provide a slide guide as shown in FIG.

  Specifically, in the example of FIG. 4, a slide guide 31 having a groove 35 is provided at a lower position of the slide plate 15, and a slide guide 32 having a groove 36 is provided at a lower position of the slide plate 16. The lower portion of the slide plate 15 is fitted into the groove 35, the slide plate 15 slides along the groove 35, the lower portion of the slide plate 16 is fitted into the groove 36, and the slide plate 16 extends along the groove 36. And configured to slide. Similar slide guides are also provided at the upper positions of the slide plates 15 and 16.

  As specific dimensions of the radiator 10, the wavelength of the peak of reflection is λ, for example, the width of the slot 12 is 10 to 15 mm, the height (length) H is 450 mm, and the radius r is about 0. 0.1λ to 0.2λ, and the width of the above sum (La + Lb) is 0.1λ to 0.4λ.

  In this case, the directivity characteristics of the antenna are as shown in FIG. 5, and the characteristics of reflection (return), loss (loss) and voltage standing wave ratio (VSWR) with respect to frequency are the curves 7R and 7L in FIG. As shown in 7V.

[2. Example of receiver with built-in antenna device: Fig. 7]
The antenna device described above can be incorporated in a thin television receiver that uses a flat display panel (FDP) such as a liquid crystal display as a video display and receives a digital terrestrial broadcast.

  An example is shown in FIG. 7 (FIG. 7A is a top view and FIG. 7B is a front view). In this example, the television receiver 50 has a configuration in which a stand 52 is attached to a receiver housing 51 as a whole.

  A liquid crystal display is provided in the receiver casing 51 so that the display screen 53 faces the front, and left and right speakers 54 and 55 are provided on both sides of the display screen 53. For example, the right side of the display screen 53 In addition, an antenna device including the radiator 10 is accommodated.

  However, in this example, an operation knob (operation dial) 26 is provided on the operation shaft 24 instead of the handle 25 described above, and only the operation knob 26 is provided outside the receiver housing 51 as an antenna device. For example, it faces the upper side of the upper surface of the receiver casing 51. Further, an arrow (marker) 27 indicating the antenna directivity is marked on the operation knob 26.

  Accordingly, the antenna directivity can be changed by turning the operation knob 26 independently of the direction of the television receiver 50 itself, that is, the direction of the screen.

  The example of FIG. 7 is a case where the television receiver 50 is configured in a stand type, but when the thin television receiver is fixed and attached to a wall surface of a room or the like, the antenna device is similarly incorporated in the television receiver. The antenna directivity can be changed independently of the screen orientation.

[3. Another example of antenna device: FIG. 8]
The example shown in FIGS. 1 to 4 is a case where the flips 13 and 14 and the slide plates 15 and 16 are flat plates, respectively. However, as shown in FIG. The flips 13 and 14 and the slide plates 15 and 16 may also be arcs arranged on the same circle 3, respectively. In this case, the operation shaft 24 can be positioned at the center of the circle 3.

  Further, the above-described example is a case where the left and right side plate portions are composed of flips 13 and 14 and slide plates 15 and 16, respectively. ) That can be expanded and contracted, and the operation mechanism can extend the width of one side plate and reduce the width of the other side plate.

It is a figure which shows an example of the antenna device of this invention. It is a figure which shows the state which changed the directivity with the antenna apparatus of FIG. It is a figure which shows the three states which changed the directivity in the antenna apparatus of FIG. It is a figure which shows an example of the guide for the slide of a slide plate. It is a figure which shows an example of the directional characteristic of the antenna apparatus of FIG. It is a figure which shows an example of the characteristic of the reflection with respect to the frequency of the antenna apparatus of FIG. 1, a loss, and a voltage standing wave ratio. It is a figure which shows an example of the television receiver which incorporated the antenna device. It is a figure which shows the other example of the antenna apparatus of this invention.

Explanation of symbols

  Since all the main parts are described in the figure, they are omitted here.

Claims (4)

A radiator including a central plate portion in which a slot is formed, and first and second side plate portions provided to extend on both sides of the central plate portion;
An operation mechanism for expanding and contracting the first and second side plate portions without changing the entire area of the radiator,
An antenna device comprising: The antenna device according to claim 1, wherein
Each of the first and second side plate portions is composed of a fixed plate portion on the central plate portion side and a slide plate that is slidable with respect to the fixed plate portion,
The operation mechanism is such that, for one side plate portion, the slide plate is slid in a direction approaching the slot, and for the other side plate portion, the slide plate is slid in a direction away from the slot.
An antenna device characterized by that. The antenna device according to claim 2, wherein
The operating mechanism is
First and second boom guides respectively attached to the slide plates of the first and second side plate portions;
A boom passed to the first and second boom guides;
An operating shaft formed integrally with the boom or attached to the boom;
An operating means for rotating the operating shaft;
An antenna device comprising:   A receiver comprising the antenna device according to any one of claims 1 to 3, wherein the radiator is housed in a receiver housing, and operating means in the operating mechanism is provided facing the outside of the receiver housing.

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