JP2000091835A - Horizontal polarization horizontal omnidirectional slot antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs by simplifying manufacture without using any metallic cylinder. SOLUTION: This device is provided with a quadrilateral-shaped dielectric substrate 1a with vertical longitudinal sides whose thickness dimension is sufficiently smaller than the wavelength of use radio waves, and whose rectangular dimension is about 1/4 times as long as the wavelength of the user radio waves, and copper foils 2 adhered to the both whole faces of the dielectric substrate 1a. The copper foils 2 on the both surfaces of the dielectric substrate 1a are short-circuited along the two rectangular sides and one longitudinal side of the dielectric substrate 1a, and the copper foils 2 and the other longitudinal side part of the dielectric substrate 1a are constituted as a radiating slot 10 for the user radio waves. Also, this device is provided with a copper foil 3 for short-circuit forming a cavity 11 whose depth dimension from the radiating slot 10 is 1/4 times as long as the wavelength of the user radio waves, and a dielectric substrate 1b, feeder 4, and feeding conductor 5 put through one of the copper foils 2 on the both surfaces of the dielectric substrate 1a while insulation with the copper foil 2 is held, and connected with the other copper foil 2 for feeding power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontally polarized horizontal omnidirectional slot antenna, and more particularly to a horizontally polarized horizontal omnidirectional slot antenna used for a mobile communication device such as a portable telephone or a car telephone.

[0002]

2. Description of the Related Art In mobile phones and car phones, etc., in addition to vertically polarized horizontal omnidirectional antennas, due to various angles of holding a telephone during a call and mutual interference due to the installation position of a base station, etc. A horizontally polarized horizontal omnidirectional antenna is required. FIG. 8 shows a typical example (first example) of a conventional slot antenna having horizontal polarization and horizontal omnidirectionality. The horizontally polarized horizontal omnidirectional slot antenna of the first example has a vertically elongated radiation slot 10x formed in a vertically long metal cylinder 7 having a cavity (cavity 11x) therein. Radiation slot 10x
Power is supplied to the portion by a feeder line (not shown) to radiate a horizontally polarized, horizontally omnidirectional radio wave from the radiation slot 10x. In this first example, a metal cylinder 7 having a three-dimensional structure is provided with a radiation slot 10x requiring high dimensional accuracy.
Is precisely formed by machining, so that the production cost increases.

Further, when the metal cylinder 7 is made thin (for example, about one-tenth wavelength of the radio wave used), the slot width becomes narrow and the slot length becomes long, and the radiation slot 1 formed by machining is used.
It becomes difficult to form 0x. Therefore, there is an example (second example) in which a radiation slot is formed in a dielectric substrate and inserted into a part of a metal cylinder (for example, in the 1997 IEICE Communications Society Conference, "Horizontal deviation"). Examination of Wave Omnidirectional Diversity Antenna ", Ando et al.). This second
FIG. 9 shows a horizontally polarized horizontal omnidirectional slot antenna of the example of FIG.
(A) and (b) show.

In this second example, a copper foil 2y is applied to one surface of a vertically long quadrilateral dielectric substrate 1y, and a vertically long radiation slot 10y is opened in the copper foil 2y. Power is supplied to the substrate 8, a metal cylinder 7a connected to the copper foil 2y on the left and right long sides of the slot substrate 8 to cover the back surface (the other surface) of the dielectric substrate 1y in a cylindrical shape, and the radiation slot 10y. A feed line (not shown) for radiating radio waves from the radiation slot 10y;
It has a structure. In the second example, two radiating slots 10y are formed in the vertical direction, and the radiating slot 10y is a collinear array type having a large vertical directivity gain. In the case of configuring as a collinear array type, if the radiation slot interval is narrowed, these mutual couplings become stronger and gain cannot be obtained, and impedance matching becomes difficult, so
In the second example, the interval is slightly shorter (0.9 wavelength) than one wavelength of the radio wave used.

In this second example, the radiating slot 10y
However, it can be easily formed with high precision by using a printed wiring board manufacturing process. However, in order to have horizontal omnidirectionality, it is necessary to cover the back side with a metal cylinder 7a. The number of manufacturing steps for connecting to the gate 7a increases. There is also an example (third example) in which a slot antenna is formed mainly using a printed wiring board manufacturing process without using a metal cylinder (for example, 1995).
IEICE General Conference Paper "Bidirectionally Circularly Polarized Rod Antenna", Kiya et al. reference).

FIG. 10 shows a slot antenna having a typical structure of the third example and its directivity in the horizontal direction.
(A) to (c) are shown. The slot antenna of the third example is a quadrilateral dielectric substrate 1z that is long in the vertical direction, and a copper foil 2z that is attached to the surface of the dielectric substrate 1z and has a vertically long radiation slot 10z in the center. And a feed line 4z that is formed on the back surface of the dielectric substrate 1z to feed power to the radiation slot 10z of the copper foil 2z and to radiate radio waves from the radiation slot 10z. In the third example, since radio waves are radiated from the front of the radiation slot 10z and simultaneously to the rear thereof, the directivity in the horizontal direction is as shown in FIG. Become bidirectional. To make this horizontal omnidirectional, the same structure as in the second example or the radiation slot 1
Behind 0z, it is necessary to provide a cavity whose depth is a quarter wavelength of the radio wave used.

In these examples, power is supplied from the lower end through a connector using a coaxial line or a microstrip line, and the power supply point is connected to a radiation slot (10x, 10y, 10
In general, the offset feeding is performed at the slot opening at a position offset downward or upward from the center position of z).

[0008]

In the first example, these conventional horizontally polarized horizontal omnidirectional slot antennas have a structure in which a radiation slot 10x with high dimensional accuracy is formed directly on a metal cylinder 7. Therefore, there is a problem that precise machining is required for the three-dimensional structure, and the manufacturing cost is increased. In the second example, the radiation slot 10y is
Since it can be formed by opening the copper foil 2y adhered to one surface of the dielectric substrate 1y, it can be easily formed using a printed wiring board manufacturing process.
Cylindrical metal cylinder 7a with a slit in the longitudinal direction
And the copper foil 2y adhered to the dielectric substrate 1y, there is a difficult process, and there is also a problem that the manufacturing cost is increased. The copper foil 2z is adhered to one surface of the dielectric substrate 1z. In the third example in which the radiation slot 10z is opened, the structure is the same as that of the second example, or the rear of the radiation slot 10z. It is necessary to provide a cavity whose depth is a quarter wavelength of the used wavelength, and there is a problem in that providing the cavity increases the outer diameter of the antenna and makes it impossible to reduce the size.

In the second example shown in FIG. 9, the radiation slots 10y are of a two-stage collinear array type. However, since the radiation directions of the radiation slots 10y are the same, the radiation slots 10y have the same radiation direction. If the interval is narrow, mutual coupling becomes too strong, gain cannot be obtained, and impedance matching becomes difficult. Therefore, the interval must be kept at about one wavelength of the radio wave to be used, and it becomes long and it is difficult to reduce the size. There is a point.

[0010] Furthermore, the feeding point is provided with radiating slots (10x, 10y, 10
Since there are only two slot openings at positions offset downward or upward from the center position of z), there is a problem in that the routing of the feed line is restricted and the design becomes difficult. There is a problem that the electromagnetic field distribution generated in the part is slightly asymmetrical up and down, and the directivity is slightly asymmetrical up and down.
When the feed line is a microstrip line, there is a problem that radiation from the microstrip line is slightly generated, and the radiation deteriorates the polarization characteristics.

An object of the present invention is to provide a horizontally polarized omnidirectional slot antenna which is easy to manufacture and inexpensive to manufacture in view of the above-mentioned problems of the prior art. It is an object of the present invention to provide a horizontally polarized horizontal omnidirectional slot antenna which is inexpensive to manufacture, has a small antenna outer diameter, and can be easily miniaturized. Third, it is easy to manufacture, has low manufacturing cost, and has a small length. It is an object of the present invention to provide a collinear array type horizontally polarized horizontal omnidirectional slot antenna which is short and easy to miniaturize. It is an object of the present invention to provide a horizontally polarized horizontal omnidirectional slot antenna capable of eliminating vertical asymmetry of directivity. Fifth, even when a feed line is a microstrip line, polarization characteristics due to radiation thereof are provided. To prevent degradation, it is to provide a horizontal polarization horizontal omnidirectional slot antenna which can obtain excellent polarization characteristics.

[0012]

According to a first aspect of the present invention, there is provided a horizontally polarized horizontally omnidirectional slot antenna having the following configurations to achieve the above object. (A) A quadrilateral dielectric substrate whose thickness is sufficiently smaller than the wavelength of the radio wave used, whose short side dimension is about one-quarter wavelength of the radio wave used, and whose long side extends in the vertical direction (b) The dielectric substrate (C) short-circuiting the conductive layers on both surfaces of the dielectric substrate with each other along two short sides and one long side of the dielectric substrate; Along with the dielectric layer, the other long side portion of the dielectric substrate is used as a radiation slot for the radio wave used, and a short-circuiting conductor forming a cavity whose depth from the radiation slot is a quarter wavelength of the radio wave used. (D) A power-supply conductor that penetrates one of the conductor layers on both surfaces of the dielectric substrate while maintaining insulation from the one conductor layer and connects to the other conductor layer to supply power.

Further, the short-circuiting conductor may be a conductor layer attached to each of two short side surfaces and one long side surface of the dielectric substrate, or It is configured as a through-hole-shaped conductor penetrating this dielectric substrate along one short side and one long side.

The power supply to the conductor layer by the power supply conductor is based on an offset power supply method.
The power supply point to the conductor layer includes two points of the radiation slot opening where impedance matching can be achieved between the power supply conductor and the conductor layer, and these two points are located in the depth direction of the cavity. As a selected point on the curve connected via.

In the horizontally polarized horizontally omnidirectional slot antenna, the dielectric substrate provided with the conductor layer and the short-circuit conductor may be folded one or more times to form a laminated structure, The cavity formed by the conductor for short-circuiting may be formed in a U-shape or zigzag shape, or may be spirally wound, and the cavity formed by the conductor layer and the conductor for short-circuiting may be formed in a spiral shape.

Further, a collimator array type in which a plurality of the horizontally polarized horizontal omnidirectional slot antennas are stacked and arranged in the vertical direction so that the radiation slots are alternately oriented in opposite directions, and alternately supplied with opposite phases. Is configured as

According to a second aspect of the present invention, in the horizontally polarized horizontal omnidirectional slot antenna, the dielectric substrate is formed by laminating two laminated dielectric substrates having a predetermined thickness. Wherein the power supply conductor penetrates one of the power supply conductive layer formed between the two laminated dielectric substrates and one of the two laminate dielectric substrates. The power supply conductor is configured to include a power supply conductor that connects between the conductive layer attached to the surface of the one dielectric substrate and the power supply conductive layer.

The power supply to the conductor layer by the power supply conductor is based on an offset power supply method.
The power supply point to the conductor layer includes two points of the radiation slot opening where impedance matching can be achieved between the power supply conductor and the conductor layer, and these two points are located in the depth direction of the cavity. As a selected point on the curve connected via.

In the horizontally polarized horizontal omnidirectional slot antenna, the dielectric substrate having a laminated structure provided with the conductor layer and the short-circuiting conductor may be further folded one or more times to form a laminated structure. The cavity formed by the dielectric layer and the short-circuit conductor may be formed in a U-shape, a zigzag shape, or a spiral wound structure, and the cavity formed by the conductor layer and the short-circuit conductor may be formed in a spiral shape.

Further, a collinear array type in which a plurality of the horizontally polarized horizontal omnidirectional slot antennas are stacked and arranged in the vertical direction so that the radiation slots are alternately directed in opposite directions, and alternately feed in opposite phases. Is configured as

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a first embodiment of the present invention, the thickness dimension is sufficiently smaller than the wavelength of the radio wave used, the short side dimension is about a quarter wavelength of the radio wave used, and the vertical direction is the long side. A quadrilateral-shaped dielectric substrate, a conductor layer applied to the entire surface of each of both surfaces of the dielectric substrate, and a conductor layer on both surfaces of the dielectric substrate. And short-circuiting along one long side, the other long side portion of the dielectric substrate, together with the conductive layer, is used as a radiation slot for the used radio wave, and the depth dimension from the radiation slot is one quarter of the used radio wave. A short-circuit conductor forming a cavity having one wavelength, and one of the conductor layers on both surfaces of the dielectric substrate,
The power supply conductor has a configuration and a structure that includes a power supply conductor that penetrates while penetrating while maintaining insulation from the one conductor layer and connected to the other conductor layer to supply power. With such a configuration and structure, the above configuration can be easily formed only by a manufacturing process of the printed wiring board, and the manufacturing cost can be reduced.

According to a second embodiment of the present invention, the dielectric substrate provided with the conductor layer and the short-circuit conductor is folded one or more times to form a laminated structure, and the conductor layer and the short-circuit conductor are formed. The conductor layer and the short-circuit conductor are formed in a U-shape or zigzag shape, or as a structure in which the dielectric substrate provided with the conductor layer and the short-circuit conductor is spirally wound. Has a spiral shape. With such a structure, the outer diameter of the antenna can be formed thin without using a metal cylinder, and miniaturization is facilitated.

In a third embodiment of the present invention, a plurality of the horizontally polarized horizontal omnidirectional slot antennas of the first embodiment are vertically stacked such that the radiation slots are alternately directed in opposite directions. The configuration and structure are of a collimator array type in which the power is arranged and alternately supplied with opposite phases. With such a configuration and structure, the arrangement pitch of the plurality of radiating slots can be set to about a half wavelength of the radio wave used, the dimension in the length direction can be shortened, and miniaturization is easy. Becomes

According to a fourth embodiment of the present invention, power is supplied to the conductor layer by the power supply conductor by an offset power supply method, and a power supply point to the conductor layer is defined by the power supply conductor. Including two points of the radiation slot opening where impedance matching can be achieved with the conductor layer, and setting these two points as one selected point on a curve connecting through the depth direction of the cavity. It has become.

With such a configuration and structure,
Since the feeding point can be selected from a wide range on the above curve, the restriction on the routing of the feeding line is relaxed and the design difficulty can be solved. Therefore, the electromagnetic field distribution generated in the slot opening portion is vertically symmetric, and the directivity thereof can be vertically symmetric.

The fifth embodiment of the present invention has a laminated structure in which the dielectric substrate is formed by laminating two laminated dielectric substrates having a predetermined thickness. A power supply conductive layer laminated between the two laminated dielectric substrates, and one of the two laminated dielectric substrates passing through one of the laminated dielectric substrates And a power supply conductor for connecting between the conductive layer adhered to the surface of the substrate and the power supply conductive layer.

With such a configuration and structure,
When the power supply line (power supply conductive layer) is a microstrip line, the microstrip line is covered and concealed by the conductive layer. Polarization characteristics can be obtained.

[0028]

Next, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1A to 1C are an external perspective view, an exploded perspective view, and a cross-sectional view taken along the arrow A, showing a first embodiment of the present invention. In the first embodiment, a quadrilateral dielectric substrate 1a having a thickness dimension sufficiently smaller than the wavelength of the radio wave used, a short side being about a quarter wavelength of the radio wave used, and a long side extending in the vertical direction, The copper foil 2 adhered to both surfaces of both surfaces of the dielectric substrate 1a and the copper foil 2 on both surfaces of the dielectric substrate 1a are combined with the dielectric substrate 1
a, and short-circuited to each other by attaching to the two short side surfaces and one long side surface of the dielectric substrate 1a. Short-circuit copper foil 3 forming a cavity 11 whose depth dimension from 10 is a quarter wavelength of the radio wave used.
A dielectric substrate 1b adhered and laminated on one of the copper foils 2 on both surfaces of the dielectric substrate 1a; a feed line 4 formed on the surface of the dielectric substrate 1b; The power supply conductor 5 is connected to the copper foil 2 on which the dielectric substrate 1b is adhered and laminated and connected to the other copper foil 2 while penetrating the copper foil 2 while maintaining insulation with the copper foil. The configuration and structure include the conductor 20.

In the first embodiment, when power is supplied to the copper foil 2 from the power supply conductor 20, horizontally radiated radio waves are radiated from the radiation slot 10 in the horizontal direction with no directivity. The first embodiment can be formed using only a manufacturing process of a printed wiring board, does not have precise machining for a three-dimensional structure as in the first example of the related art, and has the second conventional example. Since there is no difficult connection step between the metal cylinder and the slot board as in the example, the production is easy and the production cost can be reduced. In the first embodiment, the two copper foils 2 were short-circuited to each other using the short-circuiting copper foils 3 attached to the two short side surfaces and one long side surface of the dielectric substrate 1a. However, short-circuits may be made along two short sides and long sides of the dielectric substrate 1a by using through holes made of a plurality of conductors penetrating the dielectric substrate 1a. In this case, the interval between the through holes is made sufficiently shorter than the wavelength of the radio wave used.

FIGS. 2A and 2B are cross-sectional views showing a second embodiment of the present invention. FIG. 2A shows a dielectric substrate 1 on which a copper foil 2 and a short-circuiting copper foil 3 according to the first embodiment are applied.
a is folded once to form a laminated structure, and the cavity formed by the copper foil 2 and the short-circuiting copper foil 3 is formed in a U-shape so that the dimension (width) in the direction perpendicular to the radiation slot surface is reduced. Also, the reference numerals of the respective parts are different from those of the first embodiment. With such a laminated structure, the width of the dielectric substrate 1d for forming the dielectric line 4a is also reduced. In FIG. 2A, the laminated structure is folded once.
If the transverse dimension of the cross section perpendicular to the radiation slot plane (the dimension in the direction perpendicular to the radiation slot plane) is larger than the vertical dimension, increase the number of turns to make the cavity a zigzag shape. Smaller than the depth dimension of

FIG. 2B shows a dielectric substrate 1a on which the copper foil 2 and the short-circuiting copper foil 3 in the first embodiment are adhered.
In a spiral shape, the cavity formed by the copper foil 2 and the short-circuiting copper foil 3 is formed in a spiral shape, and the vertical and horizontal dimensions of the cross section perpendicular to the radiation slot surface are the depth dimensions of the cavity. The wavelength is set to be sufficiently smaller than one-half wavelength. Also in FIG. 2B, the reference numerals of the respective parts are different from those of the first embodiment, and the dielectric substrate 1f for forming the feed line 4b is also small. With such a structure, the antenna outer diameter can be reduced without using a metal cylinder, so that a manufacturing cost can be reduced and a miniaturized horizontally polarized horizontal omnidirectional slot antenna can be obtained. .

FIGS. 3 (a) to 3 (d) are an external perspective view, a sectional view taken along arrow A, a sectional view taken along arrow B and a sectional view taken along arrow C, showing a third embodiment of the present invention. In the third embodiment, two horizontally polarized horizontal omnidirectional slot antennas (each of which is referred to as an antenna element) of the first embodiment shown in FIG. This is a collimator array type horizontally polarized horizontal omnidirectional slot antenna which is vertically oriented and arranged so as to face each other and feeds in opposite phases to each other. The copper foil (2c) and the short-circuiting copper foil (3c) are covered with each other. Since the dielectric substrate (1g) to be attached is a single plate shared by the two antenna elements, the two antennas (elements)
Is a through hole 6 made of a conductor. The dielectric substrate 1h for forming the feed line 4c is also a single plate shared by the two antenna elements, and the feed line 4c and the feed conductors 5c and 5d are provided.
The distance between the feeding points for feeding the copper foils of the two antenna elements is about a half wavelength of the radio wave used, and feeding is performed in opposite phases.

In the third embodiment, since the radiation slots 10c and 10d of the two antenna elements face in opposite directions, the mutual coupling between these antenna elements can be reduced, and the two antenna elements are opposite to each other. Since power is supplied to the phase, the arrangement interval between these two antenna elements can be set to about half the wavelength of the radio wave used, at which the gain is almost maximum. That is, the dimension in the length direction (vertical direction) can be reduced. FIGS. 4A and 4B show the directivity in the vertical and horizontal directions according to the third embodiment. As described above, in the third embodiment, it is possible to easily and inexpensively manufacture the horizontal polarized horizontal omnidirectional slot antenna of the collimator array type using only the manufacturing process of the printed wiring board, and the length dimension Can be shortened to reduce the size.

When the technique of the second embodiment is used together with each antenna element of the third embodiment, the thickness can be reduced.

FIG. 5 is a sectional view showing a fourth embodiment of the present invention. Power supply to the copper foil 2 by the power supply conductor 20 (the power supply line 4 and the power supply conductor 5) is performed by an offset power supply method, and the power supply point has impedance matching between the power supply conductor 20 and the copper foil 2. Generally, one of the two points (PSP) of the opening of the radiation slot 10 can be taken. In the first to third embodiments, this is used.
In the fourth embodiment, the above two points (PSP) are included, and these two points are arbitrarily selected one points on the impedance matching curve IMC connected through the depth direction of the cavity 11.

Accordingly, the selection range of the power supply point is widened, and the degree of freedom for the wiring of the power supply line 4 is increased (ie, the restriction on the wiring is eased), and the design thereof is facilitated. In addition, since the feeding point can be located on the back side of the cavity 11 with respect to the opening of the radiation slot 10,
The influence of the feeding point is eliminated, and the electromagnetic field distribution generated in the slot opening becomes vertically symmetric, and the directivity thereof can also be vertically symmetric. Further, since the length of the power supply line 4 can be shortened by increasing the degree of freedom for the wiring of the power supply line 4, the power loss by the power supply line 4 can be reduced and the frequency band can be prevented from lowering. .

The fourth embodiment can be applied to the second and third embodiments. 6 (a) to 6 (c)
FIG. 9 is a perspective view, an exploded perspective view, and a cross-sectional view taken along an arrow A showing a fifth embodiment of the present invention. The fifth embodiment is similar to the first embodiment.
In this embodiment, a portion corresponding to the dielectric substrate 1a has a laminated structure formed by laminating two dielectric substrates 1j and 1k for lamination having the same thickness to constitute a power supply conductor (corresponding to 20). The power supply line 4d of the power supply conductive layer is connected to the dielectric substrate 1
j and 1k (triplate line), and a copper foil 2d adhered to both surfaces of the laminated dielectric substrates 1j and 1k
Is connected to the power supply line 4d by a power supply conductor (equivalent to 20).
And the copper foil 2d adhered to both surfaces of the laminated dielectric substrates 1j and 1k is connected to the laminated dielectric substrate 1j by the feeder conductor 5e. Both short side surfaces 1j and 1k and one long side surface are short-circuited to each other by the short-path copper foil 3d to form the cavity 11e. Naturally, the dielectric substrate 1b in the first embodiment is eliminated.

In the fifth embodiment, since the feed line 4d formed by the microstrip line is covered and covered by the copper foil 2d, unnecessary radiation of radio waves from the feed line 4d is eliminated, and excellent polarization is achieved. Characteristics are obtained.

In the fifth embodiment, the feeding point to the copper foil 2d is one selected point on the impedance matching curve IMC in the fourth embodiment. In addition to having the same functions and effects as the embodiment, the feed line 4d is connected to one straight line (without branches).
Since it can be a line, a further effect of reducing power loss and preventing frequency band reduction can be obtained. The fifth embodiment can be applied to the second and third embodiments.

FIGS. 7A to 7D are an external perspective view showing a sixth embodiment of the present invention, a plan view on a dielectric substrate lamination surface, a sectional view taken along arrows A and B, respectively. In the sixth embodiment, two horizontally polarized horizontal omnidirectional slot antennas (each of which is called an antenna element) of the fifth embodiment shown in FIG. It is a collimator array type that is vertically stacked so as to face each other and feeds in opposite phases to each other, and has a laminate on which a copper foil (2d) and a short-circuit copper foil (3d) of each antenna element are attached. Dielectric substrates 1j and 1k
Since the dielectric substrates 1m and 1n are shared by these antenna elements, the short-circuit conductor at the boundary between the two antenna elements is a through-hole 6a made of a conductor. Further, the copper foil 2e to be adhered to both surfaces of the laminated dielectric substrates 1m and 1n is also shared by the two antenna elements. Further, since the feeding points of the two antenna elements are separated from each other by feeding them in opposite phases with half the wavelength of the radio wave used, the arrangement pitch of the two antenna elements is also 2
It is one-half wavelength.

The sixth embodiment has the same functions and effects as the third embodiment, and also, like the fourth embodiment, improves the design easiness by increasing the degree of freedom in routing the feed line 4e. The effects of improving the vertical symmetry of the directivity, reducing the power loss by the feed line 4e and preventing the frequency band from lowering, and the effect of obtaining good polarization characteristics as in the fifth embodiment are obtained. In addition, since the vertical symmetry of the directivity is improved, there is an advantage that the array design becomes easy, and a good directivity of the Coriner array type can be obtained.

It should be noted that the feed lines 4, 4a to 4e in the sixth to fifth embodiments and the first to fifth embodiments described above.
By arranging them on the center lines of the two long sides of the dielectric substrates 1a to 1h, 1j, 1k, 1m, and 1n, the influence of radio waves from these feeder lines can be further reduced.

[0043]

As described above, the present invention firstly provides:
A conductor layer is applied to the entire surface of both sides of a quadrilateral dielectric substrate having a thickness dimension sufficiently smaller than the wavelength of the radio wave used, a short side dimension about one-quarter of the radio wave used, and a long side extending vertically. When the conductor layers on both surfaces are short-circuited to each other by a conductor along the two short sides and one long side of the dielectric substrate, and the other long side is used as a radiation slot for a radio wave to be used. At the same time, the depth from this radiation slot is
By forming a cavity having a wavelength of one-half wavelength and supplying power to the conductive layer, there is no need for precision machining or a difficult connection process for a three-dimensional structure as in the case of using a metal cylinder. Secondly, the dielectric substrate provided with the conductor layers and the conductors for short-circuiting the conductor layers can be easily manufactured by using the manufacturing process described above. Or, by forming a U-shaped or zigzag-shaped cavity by laminating a plurality of times and forming a spiral-shaped cavity by spirally winding, the manufacturing cost is reduced and the antenna outer diameter is reduced. Thirdly, there is an effect that the antenna can be made thinner and smaller. Third, the antenna having the structure of the first embodiment is used as one antenna element, and a plurality of the antenna elements are radiated. The structure and structure are such that the lots are vertically stacked so that they face alternately in the opposite direction, and alternately supply reverse-phase power, so that manufacturing is easy, manufacturing costs are low, and lengths are reduced. There is an effect that it is possible to obtain a collinear array type horizontally polarized horizontal omnidirectional slot antenna which is shortened and reduced in size.
By setting the point as a selected point on the impedance matching curve connecting via the depth direction of the cavity, the degree of freedom in routing the feed line is improved, and the design difficulty is eliminated. It is possible to reduce the power loss and prevent the frequency band from lowering by shortening, and furthermore, the feeding point can be located on the back side of the cavity with respect to the radiation slot opening, and the vertical symmetry of directivity can be improved. Fifth, the power supply conductive layer has a trilayer structure in which the dielectric substrate has a two-layer structure and a power supply conductive layer of a microstrip line is laminated between them. Since there is no need to radiate unnecessary radio waves from the power supply conductive layer, good polarization characteristics can be obtained. By adopting the above selected one point and having a triplate structure, the feed line can be formed on a straight line without branches and leaves, further reducing the power loss and preventing the frequency band from lowering. Has the effect of becoming

[Brief description of the drawings]

FIG. 1 is an external perspective view, an exploded perspective view, and a cross-sectional view taken along an arrow A showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of the present invention in which a cavity has a U-shape and a spiral shape.

FIG. 3 is an external perspective view, a sectional view taken along arrow A, a sectional view taken along arrow B, and a sectional view taken along arrow C, showing a third embodiment of the present invention.

FIG. 4 is a diagram illustrating directivity characteristics in a vertical direction and a horizontal direction according to a third embodiment of the present invention.

FIG. 5 is a sectional view showing a fourth embodiment of the present invention.

FIG. 6 is a perspective view, an exploded perspective view, and a cross-sectional view taken along an arrow A showing a fifth embodiment of the present invention.

FIG. 7 is a perspective view showing the appearance of a sixth embodiment of the present invention, a plan view of a dielectric substrate laminated surface, a cross-sectional view taken along arrow A, and a cross-sectional view taken along arrow B.

FIG. 8 is an external perspective view showing a first example of a conventional horizontally polarized horizontal omnidirectional slot antenna.

FIG. 9 is an external perspective view and a sectional view of a second example of a conventional horizontally polarized horizontal omnidirectional slot antenna.

10A and 10B are an external perspective view and a horizontal directivity characteristic diagram of a conventional horizontally polarized slot antenna using a printed wiring board manufacturing process, as viewed from the front and back sides, respectively.

[Explanation of symbols]

1a to 1h, 1j, 1k, 1m, 1n, 1y, 1z Dielectric substrate 2, 2a to 2e, 2y, 2z Copper foil 3, 3a to 3e Short-circuiting copper foil 4, 4a to 4e, 4z Feeding line 5, 5a Power supply conductor 6, 6a Through hole 7, 7a Metal cylinder 8 Slot board 10, 10a to 10g, 10x to 10z Radiation slot 11, 11a to 11g, 11x Cavity 20 Power supply conductor

Claims (12)

[Claims] 1. A horizontally polarized horizontal omni-directional slot antenna having the following configurations. (A) A quadrilateral dielectric substrate whose thickness is sufficiently smaller than the wavelength of the radio wave used, whose short side dimension is about one-quarter wavelength of the radio wave used, and whose long side extends in the vertical direction (b) The dielectric substrate (C) short-circuiting the conductive layers on both surfaces of the dielectric substrate with each other along two short sides and one long side of the dielectric substrate; Along with the dielectric layer, the other long side portion of the dielectric substrate is used as a radiation slot for the radio wave used, and a short-circuiting conductor forming a cavity whose depth from the radiation slot is a quarter wavelength of the radio wave used. (D) A power-supply conductor that penetrates one of the conductor layers on both surfaces of the dielectric substrate while maintaining insulation from the one conductor layer and connects to the other conductor layer to supply power. 2. The horizontally polarized wave according to claim 1, wherein the short-circuiting conductor is a conductor layer adhered to each of two short side surfaces and one long side surface of the dielectric substrate. Horizontal omnidirectional slot antenna. 3. The horizontal conductor according to claim 1, wherein the short-circuiting conductor is a through-hole-shaped conductor penetrating the dielectric substrate along two short sides and one long side of the dielectric substrate. Polarized horizontal omnidirectional slot antenna. 4. The power supply to the conductor layer by the power supply conductor is based on an offset power supply method, and a power supply point to the conductor layer is defined by the power supply conductor and the conductor layer. 2. The horizontal plane according to claim 1, further comprising two points of the radiating slot opening where impedance matching can be achieved between the two points, and the two points being a selected point on a curve connecting through the depth direction of the cavity. Polarized horizontal omnidirectional slot antenna. 5. The horizontally polarized horizontal omnidirectional slot antenna according to claim 1, wherein the dielectric substrate provided with the conductor layer and the short-circuit conductor is bent one or more times to form a laminated structure. A horizontally polarized horizontal omnidirectional slot antenna having a U-shaped or zigzag shaped cavity formed by a dielectric layer and a short-circuiting conductor. 6. The horizontally polarized horizontal omnidirectional slot antenna according to claim 1, wherein the dielectric substrate provided with the conductor layer and the short-circuit conductor is spirally wound around the dielectric substrate. A horizontally polarized horizontal omnidirectional slot antenna in which a layer and a cavity formed by a short-circuiting conductor are formed in a spiral shape. 7. A plurality of horizontally polarized horizontal omni-directional slot antennas according to claim 1, which are vertically stacked such that radiation slots are alternately directed in opposite directions, and are alternately supplied with opposite phase power. A horizontally polarized horizontal omnidirectional slot antenna with a collinear array. 8. The horizontally polarized horizontally omni-directional slot antenna according to claim 1, wherein the dielectric substrate is formed by laminating two laminated dielectric substrates having a predetermined thickness. Wherein the power supply conductor penetrates one of the power supply conductive layer formed between the two laminated dielectric substrates and one of the two laminate dielectric substrates. A horizontally polarized horizontal omnidirectional slot antenna comprising: a power supply conductor connecting between the conductive layer attached to the surface of the one dielectric substrate for lamination and the power supply conductive layer. 9. The power supply to the conductor layer by the power supply conductor is based on an offset power supply method, and a power supply point to the conductor layer is defined by the power supply conductor and the conductor layer. 9. The horizontal plane according to claim 8, comprising two points of the radiating slot opening where impedance matching can be achieved between the two points, and the two points are selected points on a curve connecting through the depth direction of the cavity. Polarized horizontal omnidirectional slot antenna. 10. The horizontally polarized horizontally omnidirectional slot antenna according to claim 8, wherein the dielectric substrate having the laminated structure provided with the conductor layer and the short-circuit conductor is further laminated one or more times. A horizontally polarized horizontal omnidirectional slot antenna having a U-shaped or zigzag shaped cavity formed by the dielectric layer and the short-circuiting conductor. 11. The horizontally polarized horizontal omnidirectional slot antenna according to claim 8, wherein a laminated dielectric substrate provided with the conductor layer and the short-circuit conductor is spirally wound. A horizontally polarized horizontal omnidirectional slot antenna in which a cavity formed by the conductor layer and the short-circuit conductor has a spiral shape. 12. A plurality of horizontally polarized horizontal omni-directional slot antennas according to claim 8, which are vertically stacked so that radiation slots are alternately directed in opposite directions, and are alternately supplied with opposite phase power. A horizontally polarized horizontal omnidirectional slot antenna with a collinear array.