CN101213707B - Antenna - Google Patents
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- CN101213707B CN101213707B CN200680024016XA CN200680024016A CN101213707B CN 101213707 B CN101213707 B CN 101213707B CN 200680024016X A CN200680024016X A CN 200680024016XA CN 200680024016 A CN200680024016 A CN 200680024016A CN 101213707 B CN101213707 B CN 101213707B
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- 239000002184 metal Substances 0.000 claims abstract description 17
- 238000005452 bending Methods 0.000 claims abstract description 14
- 230000010287 polarization Effects 0.000 claims description 21
- 230000005855 radiation Effects 0.000 claims description 9
- 238000009434 installation Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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Abstract
An antenna formed by bending a roughly rectangular sheet metal in a plate-like radiating element with at least three faces. A first slit is formed so as to pass the center point of the plate-like radiating element from the lower end of the plate-like radiating element up to near the upper end of the plate-like radiating element, and plate-like dipole elements are formed on both sides thereof. A second slit is formed parallel with the upper end of the plate-like radiating element, and a fold-back element is formed on the upper side thereof. Feeding points are formed at the lower end of the plate-like radiating element on both sides of the first slit.
Description
Technical Field
The present invention relates to an antenna, such as an indoor antenna and an outdoor antenna for receiving and propagating digital broadcast waves of terrestrial integrated services of UHF band.
Background
In an ISTB-T (terrestrial Integrated services digital broadcasting) system, electromagnetic waves of a UHF band are used, and in this UHF band, 470 to 770MHz (13 to 62 channels) are used.
As an indoor antennｃA that receives electromagnetic waves of the UHF band, ｃA loop antennｃA and ｃA dipole antennｃA have been used (see, for example, JP- ｃA-7-249922). The dipole antenna is formed from a conductive tube. In the field of antennas, the broadband characteristic and the high gain characteristic of dipole antennas are known. However, the overall length of these dipole antennas requires about 0.5 λ (wavelength) of the lower end frequency, and the radiation characteristics thereof are unidirectional characteristics.
As an outdoor antenna for receiving electromagnetic waves in the UHF band, a unidirectional antenna is used. Such antennas are commonly referred to as yagi antennas and reflector-equipped dipole antennas. These single directional antennas have good reception performance with respect to reception in a specific direction. However, since the outdoor antenna needs a large occupation area and has a single directivity characteristic, in the case where the directions of electromagnetic waves propagating are different from each other according to broadcasting stations, it is necessary to separately install the outdoor antenna toward the respective directions of the traveling electromagnetic waves.
Fig. 14 shows an example of the case where two yagi antennas are mounted corresponding to electromagnetic waves whose traveling directions are different from each other.
Yagi-type antennas 1a and 1b for horizontally polarized waves are mounted on the apex portion of the antenna mast 2 and spaced at predetermined intervals. In this case, the two octal wood antennas 1a and 1b are installed to be directed toward the traveling direction of the electromagnetic wave. Feed cables 4a and 4b are connected to feed points 3a and 3b of yagi antennas 1a and 1b, respectively. The feeder cables 4a and 4b are held along the antenna mast 2 and connected to a mixer 5 mounted halfway on this antenna mast 2. In this mixer 5, signals received by the yagi-type antennas 1a and 1b are mixed with each other, and then, the mixed signal is supplied to a television receiver in a home through an output cable 6. It will be appreciated that the holder 7 is mounted on the base of the mast 2, while this mast 2 is fixed to the roof by means of the holder 7.
As described above, in the case of receiving electromagnetic waves whose traveling directions are different from each other depending on broadcasting stations by using a single-directional antenna, it is necessary to install a plurality of such single-directional antennas, and thus, the antenna structure is very complicated, for example, a mixer is to be installed and cable wiring is complicated.
Problems to be solved by the invention
In the UHF-band wide-band antenna, snow is likely to accumulate due to the large area of the upper projection, and thus the strength of the antenna itself must be increased to withstand the electric influence caused by the accumulation of snow and the weight of the accumulated snow.
In addition, since the above-described yagi-type antenna has a single directivity characteristic, in the case where the traveling directions of electromagnetic waves are different from each other depending on broadcasting stations, it is necessary to separately install a plurality of these antennas toward the respective traveling directions of electromagnetic waves. Therefore, there are problems in that an installation place is limited and an installation cost is increased.
In addition, in order to simply install the antenna, an indoor antenna is commercially provided on the market. Also, since these indoor antennas have directivity, it is necessary to rotate and adjust the main body of the antenna in order to achieve better receiving conditions. Finding the best reception condition requires a long time. Then, in the case where indoor antennas are installed beside the television receiver, the best receiving directions of these indoor antennas do not always coincide with the direction of the television receiver. This condition may also greatly impair good appearance. In addition, the antenna having the unidirectional characteristic has a problem that: if an object having a certain dielectric constant, such as a human being, approaches the antenna, the reception level of the antenna is greatly reduced.
Disclosure of Invention
An object of the present invention is to provide an antenna for both indoor and outdoor use, which is simple and compact in structure, can be easily installed even in a narrow installation space, and can operate with a single antenna in the case where electromagnetic waves travel from multiple directions, and can also be used for both indoor antennas and outdoor antennas.
Means for solving the problems
In order to achieve the above object, according to the present invention, there is provided an antenna comprising:
a flat plate-shaped radiating element formed by bending a substantially rectangular-shaped metal plate into a shape having at least three planes;
a first slot formed from a lower edge of the plate-shaped radiating element up to a portion near an upper edge of the plate-shaped radiating element while passing through a center point of the plate-shaped radiating element and forming plate-shaped dipole elements on both sides thereof;
a second slot formed parallel to the upper edge of the plate-shaped radiating element and forming a folded element on the upper side thereof; and
feeding points formed on both sides of the first slot on the lower edge of the plate-shaped radiating element.
In order to achieve the above object, according to the present invention, there is also provided an antenna comprising:
a flat plate-shaped radiating element formed by bending a metal plate having a substantially rectangular shape into a shape having at least three planes;
a first slot formed from a portion near a lower edge of the plate-shaped radiating element to a portion near an upper edge of the plate-shaped radiating element while passing through a center point of the plate-shaped radiating element and plate-shaped dipole elements formed on both sides thereof;
a second slot formed parallel to the upper edge of the plate-shaped radiating element and forming a first folded element on the upper side thereof;
a third slot formed in parallel with a lower edge of the plate-shaped radiating element and forming a second folded element on a lower side thereof;
a fourth slot formed in parallel with an upper edge of the plate-shaped radiating element from a left edge of the plate-shaped radiating element up to a portion near a center point;
a fifth slot formed in parallel with an upper edge of the plate-shaped radiating element from a right edge of the plate-shaped radiating element up to a portion near a center point; and
feed points provided between the first slot and the fourth slot and between the first slot and the fifth slot.
In order to achieve the above object, there is also provided according to the present invention an antenna comprising:
a flat plate-shaped radiating element formed by bending a metal plate having a substantially rectangular shape into a shape having at least three planes;
a first slot formed from a portion near a lower edge of the radiating element of the plate to a portion near an upper edge of the plate-shaped radiating element while passing through a center point of the plate-shaped radiating element and plate-shaped dipole elements formed on both sides thereof;
a second slot formed parallel to the upper edge of the plate-shaped radiating element and forming a first folded element on the upper side thereof;
a third slot formed in parallel with a lower edge of the plate-shaped radiating element and forming a second folded element on a lower side thereof; and
feeding points formed on both sides of the first slot on the lower edge of the plate-shaped radiating element.
In order to achieve the above object, according to the present invention, there is also provided an antenna comprising:
an antenna member formed of a flat plate-shaped radiating element formed by bending a metal plate having a substantially rectangular shape into a shape having at least three planes or a circular shape, the antenna member being capable of receiving electromagnetic waves; and
a cover covering the antenna element; wherein,
the length of the shield on the side of the intersecting polarization plane is longer than the length of the shield on the side of the polarization plane.
The antenna may also include a base coupled to the cover.
The antenna may also include an output element that outputs a signal based on the electromagnetic waves received by the antenna element.
The antenna may also include an outdoor mounting fixture connected to the enclosure.
The antenna may further include a support member integrally or detachably provided on the cover and selectively connected to one of the indoor mounting base and the outdoor mounting fixture.
THE ADVANTAGES OF THE PRESENT INVENTION
According to the present invention, since the non-directional antenna is formed using the plate-shaped radiating element while the plate-shaped radiating element is formed by bending the substantially rectangular-shaped metal plate into the polygonal shape larger than or equal to the quadrangle or the circle, the radome can be shaped into a cylindrical shape having a length on the side of the polarization plane shorter than the length on the side of the intersecting polarization plane. As a result, in the case of using the antenna as an indoor antenna, the installation space can be very small compared to a general indoor antenna, so that the degree of freedom of antenna installation is large, and the antenna can be easily installed in a narrow place.
In addition, since the directivity of the horizontal plane is a characteristic of omni-directionality, the antenna is not rotated any more to adjust the reception characteristic, so that the adjustment time can be greatly reduced. In addition, since the antenna characteristic is designed to be omnidirectional, the antenna can easily receive the reflected wave, and even when the direct wave direction of the antenna is shielded, since the antenna receives the reflected wave, the lowering of the reception level can be avoided.
In addition, in the case where an indoor antenna is installed beside a television receiver, the antenna can obtain a receiving performance which is not affected by an electromagnetic wave environment; the direction of the television receiver can be coincident with the direction of the antenna, so that the good appearance of the antenna can be maintained. In addition, a change in directivity generated when a person approaches the antenna can be reduced, so that the amount of decrease in the reception level can be reduced as compared with the reception level of a general antenna having a single directivity characteristic.
Drawings
[ FIG. 1A ]: fig. 1A to 1C show an indoor antenna according to a first embodiment mode of the present invention, and fig. 1A is a plan view;
[ FIG. 1B ]: fig. 1A to 1C show an indoor antenna according to a first embodiment mode of the present invention, and fig. 1B is a front view;
[ FIG. 1C ]: fig. 1A to 1C show an indoor antenna according to a first embodiment mode of the present invention, and fig. 1C is a sectional view;
[ FIG. 2A ]: fig. 2A and 2B illustrate an indoor antenna according to a second embodiment mode of the present invention, and fig. 2A is a perspective view;
[ FIG. 2B ]: fig. 2A and 2B illustrate an indoor antenna according to a second embodiment mode of the present invention, and fig. 2B is a partial sectional view;
[ FIG. 3 ]: fig. 3 is an exploded perspective view of an indoor and outdoor universal antenna according to a third embodiment mode of the present invention;
[ FIG. 4A ]: fig. 4A and 4B show a case where an indoor and outdoor general-purpose antenna according to a third embodiment mode is used as an outdoor antenna, and fig. 4A is a perspective view;
[ FIG. 4B ]: fig. 4A and 4B show a case where an indoor and outdoor general-purpose antenna according to a third embodiment mode is used as an outdoor antenna, and fig. 4B is a partial sectional view;
[ FIG. 5A ]: fig. 5A to 5C show a first configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 5A is a plan view;
[ FIG. 5B ]: fig. 5A to 5C show a first configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 5B is a front view;
[ FIG. 5C ]: fig. 5A to 5C show a first configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 5C is a side view;
[ FIG. 6 ]: fig. 6 is a front view showing the broadband antenna shown in fig. 5A to 5C unfolded into a planar form;
[ FIG. 7A ]: fig. 7A to 7C show a second configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 7A is a plan view;
[ FIG. 7B ]: fig. 7A to 7C show a second configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 7B is a front view;
[ FIG. 7C ]: fig. 7A to 7C show a second configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 7C is a side view;
[ FIG. 8A ]: fig. 8A to 8C show a third structural example of the broadband antenna used in the above-described respective embodiment modes, and fig. 8A is a plan view;
[ FIG. 8B ]: fig. 8A to 8C show a third structural example of the broadband antenna used in the above-described respective embodiment modes, and fig. 8B is a front view;
[ FIG. 8C ]: fig. 8A to 8C show a third structural example of the broadband antenna used in the above-described respective embodiment modes, and fig. 8C is a side view;
[ FIG. 9A ]: fig. 9A to 9C show a fourth configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 9A is a plan view;
[ FIG. 9B ]: fig. 9A to 9C show a fourth configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 9B is a front view;
[ FIG. 9C ]: fig. 9A to 9C show a fourth configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 9C is a side view;
[ FIG. 10A ]: fig. 10A to 10C show a fifth configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 10A is a plan view;
[ FIG. 10B ]: fig. 10A to 10C show a fifth configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 10B is a front view;
[ FIG. 10C ]: fig. 10A to 10C show a fifth configuration example of the broadband antenna used in the above-described respective embodiment modes, and fig. 10C is a side view;
[ FIG. 11 ]: fig. 11 is a graph showing the horizontal plane directivity of the horizontal polarized wave of the broadband antenna relating to the fifth structural example described above at a frequency of 470 MHz;
[ FIG. 12 ]: fig. 12 is a graph showing the horizontal plane directivity of the horizontal polarized wave of the broadband antenna relating to the fifth configuration example described above at a frequency of 680 MHz;
[ FIG. 13 ]: fig. 13 is a graph showing the horizontal plane directivity of the horizontal polarized wave of the broadband antenna relating to the fifth configuration example described above at the frequency of 890 MHz;
[ FIG. 14 ]: fig. 14 is a diagram showing an example of a case where two sets of yagi antennas are mounted in accordance with electromagnetic waves having different traveling directions from each other.
Detailed Description
Mode for the invention now, an embodiment mode of the present invention will be described with reference to the accompanying drawings.
It should be understood that the following description of the embodiment modes of the present invention is based on the initial condition of receiving an electromagnetic wave transmitted in the form of a horizontally polarized wave. In this case, the polarization plane of the electromagnetic wave constitutes a plane parallel to the ground, and another plane intersecting the polarization plane at right angles corresponds to the intersecting polarization plane. When the antenna is mounted, the direction of the antenna is required to coincide with the polarization plane of the received electromagnetic wave. In the case where the inventive concept of the present invention is applied to reception of electromagnetic waves transmitted in the form of vertically polarized waves, since the polarization plane of the electromagnetic waves constitutes a plane perpendicular to the ground, the antenna of the present embodiment mode can be tilted by 90 ° to coincide with the polarization plane to be received.
(first embodiment mode)
In the indoor antenna 20a shown in fig. 1A to 1C, reference numeral 21 denotes a base made of, for example, synthetic resin and made in a circular shape. The first antenna body 30A is mounted on the base 21 via a support cylinder 22, and the second antenna body 30B is mounted on the first antenna body 30A via another support cylinder 23.
The diameter of the base 21 is set to about 0.22 λ (═ about 140 mm). The bottom plate 24 is detachably provided on the base 21 by using, for example, screws. In which a mixing plate 25 is arranged. A mixing circuit that mixes the reception signal of the first antenna main body 30A with the other reception signal of the second antenna main body 30B is provided on the mixing plate 25. The mixed output of this hybrid circuit is led to the outside of the base 21 through an output cable 26. The output connection block 27 is connected to the top of the output cable 26. This output connection block 27 is connected to an antenna terminal of a television receiver (not shown) installed in a home.
The first antenna body 30A includes a cylindrical antenna cover 31a formed using a synthetic resin, and a broadband antenna 32a provided in this antenna cover 31 a. The radome 31a is mounted on the upper portion of the support cylinder 22. The feeding point 33a of the broadband antenna 32a is connected to the hybrid board 25 provided in the base 21 through a feeding cable 34a, and the feeding cable 34a is connected to the hybrid board 25 through a soldering process or the like.
As will be described in detail later, the broadband antenna 32a is configured by using a non-directional (omnidirectional) flat plate-shaped radiation element to receive a TV broadcast wave in a UHF band. The non-oriented flat plate-shaped radiating element is formed by bending a substantially rectangular-shaped metal plate into a polygonal shape (i.e., a shape having at least three planes) or a circular shape more than or equal to a quadrangle.
In addition, the second antenna body 30B includes, as with the first antenna body 30A, an antenna cover 31B formed in a cylindrical shape with a synthetic resin and a broadband antenna 32B provided in this antenna cover 31B. The antenna cover 31b is attached to the antenna cover 31a of the first antenna body 30A via the support cylinder 23. The feed cable 34b is connected to the feed point 33b of the broadband antenna 32 b. The feeding cable 34b passes through the central portion of the first antenna body 30A and then is connected to the hybrid board 25 provided in the base 21. In addition, a cover 35 is fixedly or detachably provided on the upper open portion of the antenna cover 31 b. As will be described in detail later, the maximum length of the polarization plane is set to about 0.16 λ for the broadband antennas 32a and 32 b. It should be noted that the symbol "λ" represents the wavelength of the lower end frequency in the frequency band used.
The length "da" of the antenna covers 31a and 31b on the polarization plane side (i.e., the length protruding in the electric field direction) is set to be slightly longer than the maximum length (0.16 λ) of the polarization planes of the broadband antennas 32a and 32b, i.e., set to be about 0.17 λ, for the diameters of these antenna covers 31a and 31b in this example. In addition, the length "L" of the antenna covers 31a and 31b, i.e., the length thereof on the side of the intersecting polarization plane, is set to a length longer than the antenna cover length "da" on the side of the polarization plane.
As described previously, in the antenna bodies 30A and 30B, since the substantially rectangular-shaped metal plate is bent in a polygonal form more than or equal to a quadrangle (each having a shape of at least three planes) to form the broadband antennas 32a and 32B, the length "da" of the antenna covers 31a and 31B is set to be about 0.17 λ, and therefore, the length "da" can be made shorter than the antenna cover length "L" on the side of the intersecting polarization plane, and the diameter of the base 21 can be set to be about 0.22 λ (about 140 mm). As a result, the occupied area of the antenna can be made considerably small compared with the occupied area of the related broadband antenna, so that the antenna can be installed in a narrow space.
Note also that, although the first embodiment mode described above is an example, there are cases where the antenna covers 31a and 31b are formed in a cylindrical shape. These antenna covers 31a and 31b may be formed in a polygonal shape such as a hexagonal shape and an octagonal shape or other shapes such as a conical shape and a polygonal pyramid shape.
(second embodiment mode)
The first embodiment mode described above illustrates a case where: the antenna covers 31a and 31B are individually provided with respect to the first antenna body 30A and the second antenna body 30B, and these antenna covers 31a and 31B are connected to each other by using the support cylinder 23. In the second embodiment mode of the present invention shown in fig. 2A and 2B, the antenna body 30 is protected by a single radome 31. This radome 31 is fixed at a central portion thereof by screws 313, and at the same time, cover members 311 and 312 formed in, for example, a semi-cylindrical shape are coupled to each other. In addition, the antenna cover 31 is formed by inclining the upper edge member.
The lower edge portion of the antenna cover 31 is made small in diameter, the antenna main body 30 is detachably provided on the base 21a, and it is also noted that, in the first embodiment mode, the mixing plate 25 is provided on the antenna main body 30 side, and the connection stopper 43 is provided on the lower edge portion of the antenna main body 30 (below the mixing plate 25 portion). Further, the output connection stopper 27 is directly fixed to the base 21 a.
The broadband antennas 32a and 32b described in the first embodiment mode are provided inside the radome 31, and the feeding points thereof are connected to the hybrid circuit of the hybrid board 25 through a feeding cable (not shown). Then, the signal mixed by this hybrid circuit is transmitted from the connection block 43 to the output connection block 27 through the feeder cable. Since the other structure of the indoor antenna 20B is the same as that of the indoor antenna 20A shown in the first embodiment mode, detailed description thereof is omitted.
The indoor antenna 20B configured in the above-described manner can achieve the same effects as those of the indoor antenna 20A according to the first embodiment mode.
(third embodiment mode)
A third embodiment mode of the present invention shown in fig. 3, 4A and 4B constitutes an antenna 20D common to both indoor and outdoor by using the antenna main body 30 described in the second embodiment mode. In this indoor and outdoor universal antenna 20D, an indoor mounting base 21a and an outdoor mounting base 21c are detachably provided on the antenna main body 30. For example, although the structure between the antenna main body 30 and the bases 21a, 21c is made a locking type structure, the indoor mounting base 21a and the outdoor mounting base 21c can be rotatably rotated by a predetermined angle about the fulcrum shaft so as to be detachably fixed to the antenna main body 30.
The connection stopper 43 is provided at the center of the lower edge portion of the antenna main body 30, and the other connection stopper 41 is provided at the center inside the base 21 a. When the antenna main body 30 is mounted on the base 21a, the connection stopper 43 is connected to the connection stopper 41. This connection block 41 is connected to the output connection block 27 by a feed cable.
In addition, when the outdoor mounting base 21c is constituted by the cylindrical member 46, the outdoor mounting member 51 is fixed to the outside of this cylindrical member 46. In the outdoor mounting member 51, mounting members 53a and 53b in the shape of a rod are fixedly provided on both sides of the mounting base 52, and screw portions are formed at the tops of the mounting members 53a and 53 b. For example, wing nuts 55a and 55b are tightened on top of mounts 53a and 53b by lowering mount 54. The mounting base 52 is screwed to the support cylinder 22.
The outdoor mounting member 51 can mount the indoor and outdoor universal antenna 20D in the outdoor space by placing the rod of the antenna rod or the rod of the proximity (veranda) fixture between the mounting base 52 and the depression (depression) mounting member 54 and by tightening the nuts 55a and 55 b.
Fig. 4A shows a state where the outdoor attachment base 21c is fixed to the antenna main body 30, and fig. 4B is a sectional view showing a portion fixed to the base 21 c. Although the lower side of the outdoor attachment base 21c is open, when the base 21c is fixed to the antenna main body 30, the connection stopper 43 provided on the lower edge portion of the antenna main body 30 is located on the lower opening portion of the base 21 c. As a result, in this opening portion, the externally connected coaxial cable can be connected with the connection stopper 43.
In the case where the antenna 20D configured in the above-described manner for both indoor and outdoor use is used as an indoor antenna, the indoor mounting base 21a is fixed to the antenna main body 30. In addition, in the case where the indoor and outdoor universal antenna 20D configured as described above is used as an outdoor antenna, the outdoor attachment base 21c is fixed to the antenna main body 30. Then, the antenna 20D common to the indoor and outdoor is mounted on the rod of the antenna rod type installation by using the outdoor installation member 51.
Next, a structural example of the broadband antennas 32a and 32B of the antenna bodies 30A and 30B according to the above-described first, second, and third embodiment modes is explained.
(first structural example)
In the broadband antenna 32-1 shown in fig. 5A to 5C and fig. 6, reference numeral 61 denotes a flat plate-shaped radiating element made of a metal plate having a substantially rectangular shape. Meanwhile, this flat plate-shaped radiating element is formed by bending a metal plate into a substantially quadrangular shape, for example, a "U" shape.
As for the thickness of the metal plate, for example, a metal plate having a thickness of less than or equal to about 0.002 λ may be used. With respect to the plate-shaped radiating element 61, a first slot 62 is vertically provided on the central portion of the plate-shaped radiating element 61 from the lower side of the element up to a position near the upper side thereof; and plate-shaped dipole antennas 63a and 63b are formed on the left and right sides of the first slot 62. In addition, a second slot 64 is provided in the plate-shaped radiating element 61 from a position near the left edge of the plate-shaped radiating element 61 to a position near the right edge thereof in parallel with the upper edge thereof. At the same time, a folded element 65 is formed in the upper part of the second groove.
The plate-shaped radiating element 61 is set as follows: that is, for example, the overall length "L" (lateral width) of the flat plate-shaped radiating element 61 is set to about 0.35 λ, and the width "L" of the front plane thereof is set to be1"and width of its side plane" L2"set to about 0.12 λ, height" H "set to be longer than 0.05 λ or about 0.05 λ, spacing" D "of first grooves 621"and spacing of second groove 64" D2"set to about 0.01 λ. As described above, the symbol "λ" represents the wavelength of the lower end frequency in the use band. In addition, regarding the second slot 64, its length "L" on the side plane of the plate-shaped radiating element 613"set to about 0.09 λ. In the plate-shaped radiating element 61, due to its width L in the front plane1And its width L in the side plane2About 0.12 lambda and thus the maximum length in the polarization plane (the length of the element diagonal) is about 0.16 lambda.
In addition, feeding projections 66a and 66b are formed on the dipole elements 63a and 63 b. The dipole elements 63a and 63b are made of opposite side portions (i.e., lower edge portions on the side of the first slot 62) of the feeding projections 66a and 66b projecting downward by a predetermined length. Feeding points 67a and 67b and another feeding point 67b are provided on the feeding projections 66a and 66 b.
In the broadband antenna 32-1 shown in fig. 5A to 5C and fig. 6, when power is supplied from the feeding portion to the feeding points 67a and 67b of the dipole elements 63a and 63b as indicated by the arrow "a" in fig. 6, feeding current flows from the feeding points 67a and 67b along the circumferential edges of the dipole elements 63a and 63b, so that the same operation as that of the two-wire folded dipole is performed. As a result, the broadband antenna 32-1 can achieve the same effect as that of the two-wire folded dipole, can operate over a wide frequency band, and can correct the impedance of the antenna. As a result, the antenna 32-1 can achieve the same effect as that of the two-wire folded dipole, can operate over a wide frequency band, and can correct the impedance of the antenna. As a result, the antenna 32-1 can be made compact, and a good VSWR (voltage standing wave ratio) characteristic can be achieved.
(second Structure example)
The broadband antenna 32-1 relating to the first structural example described above is formed by bending the plate-shaped radiating element 61 into a "U" shape, and the broadband antenna 32-2 relating to the second structural example and shown in fig. 7A to 7C is formed by bending the plate-shaped radiating element 61 into a substantially hexagonal shape. In this case, the width "L" of the corresponding edge of the plate-shaped radiating element 614"set to about 0.07 λ, width of edge on one side of rear plane" L5"set to about 0.03 λ; and the tops of the dipole elements 63a and 63b are disposed at a predetermined interval, i.e., the edge portions on the rear plane side are spaced at a predetermined interval. Since the other structures and dimensions of this broadband antenna 32-2 are the same as those of the antenna shown in fig. 5A to 5C, detailed description thereof is omitted.
As described above, since the plate-shaped radiating element 61 is bent into a substantially hexagonal shape to form the broadband antenna 32-2, the directivity deviation can be reduced as compared with the case where the plate-shaped radiating element 61 is bent into a "U" shape to form the broadband antenna 32-1.
It should also be noted that fig. 7A to 7C show a case where the plate-shaped radiating element 61 is bent into a substantially hexagonal shape to form the broadband antenna 32-2. In addition, the flat plate-shaped radiation element 61 may be formed in a polygonal shape, such as an octagon or a circle.
(third structural example)
As shown in fig. 8A to 8C, the wideband antenna 32-3 according to the third structural example is configured as follows: that is, the two broadband antennas 32-1 shown in FIGS. 5A to 5C are formed in a U-shape and are arranged at symmetrical positions in the vertical direction. These broadband antennas 32-1 are connected to each other by a plate-shaped radiating element 61a made of a piece of metal plate to constitute an antenna. In this case, the height "H" of the plate-shaped radiating element 61a is set to about 0.1 λ, which is twice as high as the height of the plate-shaped radiating element 61 shown in fig. 5A to 5C; and feeding projections 66a and 66b formed on the central portion thereof are on the left side and slots 71 in the horizontal direction are provided on the right and left sides, so that upper and lower antennas can be formed. Then, feeding points 67a and 67b are provided on the feeding protruding portions 66a and 66 b. In addition, the second groove 64 is parallel to the upper and lower edges of the plate-shaped radiating element 61a to constitute a folded element 65.
In addition, in the plate-shaped radiating element 61a, the length of the second slot 64 is made shorter than that of the first structural example, and the length "L" formed on the side plane of the second slot 643"set to about 0.035 λ. The size of the corresponding portion other than the above-described structural portion is the same as that of the broadband antenna 32-1 shown in the first structural example of fig. 5A to 5C.
As described above, the height "H" of the plate-shaped radiating element 61a is approximately twice as high as the height of the plate-shaped radiating element 61 shown in fig. 5A to 5C, and power is supplied from the feeding points 67a and 67b provided at the center of this plate-shaped radiating element 61a using this center feeding system. As a result, the upper antenna and the lower antenna can be configured on one plate-shaped radiating element 61a, so that the stacking effect can be achieved.
(fourth Structure example)
As shown in fig. 9A to 9C, the wideband antenna 32-4 relating to the fourth structural example is configured as follows: that is, in the broadband antenna 32-3 of the third structural example shown in fig. 8A to 8C, the groove 71 formed in the center of the plate-shaped radiating element 61a is omitted. The dimensions of the corresponding portion of this antenna are the same as the dimensions of the broadband antenna 32-3 shown in fig. 8A-8C.
(fifth structural example)
As shown in fig. 10A to 10C, the wideband antenna 32-5 relating to the fifth configuration example is configured as follows: that is, in the broadband antenna 32-3 of the third structural example shown in fig. 8A to 8C, the plate-shaped radiating element 61a is bent into a substantially hexagonal shape having the same shape as that of the broadband antenna 32-2 shown in fig. 7A to 7C to constitute the broadband antenna 32-5, and has a width "L" of4"As a front plane, the right and left edges of this broadband antenna 32-5 are set to about 0.07 λ, and the width of the edge on the side of the rear plane thereof" L5"set to about 0.03 λ. Since the other configurations are the same as those of the wide band antenna 32-3 shown in fig. 8A to 8C, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.
Fig. 11 shows the horizontal directivity of the horizontally polarized wave of the wideband antenna 32-5 relating to the above-described fifth structural example at the frequency of 470 MHz. Fig. 12 shows the horizontal directivity of the horizontally polarized wave of the wideband antenna 32-5 relating to the above fifth configuration example at a frequency of 680 MHz. Fig. 13 shows the horizontal directivity of the horizontally polarized wave of the wideband antenna 32-5 relating to the above-described fifth structural example at the frequency of 890 MHz.
By using the broadband antenna 32-5, the directivity of the horizontal plane can be made omnidirectional. Further, in the broadband antennas 32-1 to 32-4 shown in the first to 4 th structural examples, the directivity of the horizontal plane can be made omnidirectional.
Note also that the broadband antenna 32-5 shown in the fifth structural example is the same as the broadband antenna 32-4 of the fourth structural example, and the slot 71 made in the central portion of the plate-shaped radiating element 61a may alternatively be omitted.
Although, the second structural example and the fifth structural example describe the case where the plate-shaped radiating elements 61 and 61a are bent into a hexagonal shape to constitute the broadband antennas 32-2 and 32-5. Alternatively, these plate-shaped radiation elements 61 and 61a may be bent in a polygonal shape such as an octagonal shape.
In the respective embodiment modes described above, a case where the broadband antenna 32-5 relating to the fifth structural example shown in fig. 10A to 10C is used as the broadband antennas 32a and 32b is taken as an example. As can be seen from the above description, the broadband antennas 32-1 to 32-4 related to the first structural example to the fourth structural example may be used alternatively.
In the broadband antennas 32-1 to 32-5 relating to the first structural example to the fifth structural example, the width L of the front plane1And width L of the side plane2About 0.12 lambda and the maximum length of the polarization plane is about 0.16 lambda. As a result, as shown in fig. 1, in the respective embodiment modes, the lengths of the radomes 31a and 31b on the side of the polarization plane, that is, the lateral widths "da" thereof can be set to about 0.17 λ.
As a result, in the indoor antennas 20A and 20B shown in each of these embodiment modes and the antenna 20D common to both indoor and outdoor, the diameter of the base 21, 21a, 21c designed for the indoor antenna can be set small, about 0.22 λ (about 140 mm).
As described above, the installation space of the indoor antennas 20A and 20B relating to the first and second embodiment modes, and also the installation space in the case of using the antenna 20D common to the indoor and outdoor relating to the third embodiment mode as an indoor antenna are very small as compared with the installation space of a normal antenna. As a result, the degree of freedom of the installation space is large, and the antennas 20A, 20B, 20D can be easily installed in a narrow place.
In addition, the present invention is not limited to the above embodiment modes, but may be implemented in another manner by changing the structural elements at the implementation stage without departing from the spirit of the present invention.
Claims (8)
1. An antenna operable to receive electromagnetic waves transmitted in the form of horizontally polarized waves, the directivity of the antenna in a horizontal plane having an omnidirectional characteristic, the antenna comprising:
a flat plate-shaped radiation element formed by bending a substantially rectangular-shaped metal plate into a polygonal shape more than or equal to a quadrangle;
a first slot provided vertically in a portion from a lower edge of the plate-shaped radiating element up to a vicinity of an upper edge of the plate-shaped radiating element while passing through a center point of the plate-shaped radiating element and forming plate-shaped dipole elements on both side surfaces of the first slot;
a second slot formed in parallel with an upper edge of the plate-shaped radiating element and forming a folding element on an upper side thereof; and
a feed point is provided on the lower edge of the plate-shaped radiating element on both sides of the first slot.
2. An antenna operable to receive electromagnetic waves transmitted in the form of horizontally polarized waves, the directivity of the antenna in a horizontal plane having an omnidirectional characteristic, the antenna comprising:
a flat plate-shaped radiation element formed by bending a substantially rectangular-shaped metal plate into a polygonal shape more than or equal to a quadrangle;
a first slot formed vertically from a portion near a lower edge of the radiating element of the panel to a portion near an upper edge of the plate-shaped radiating element while passing through a center point of the plate-shaped radiating element and forming plate-shaped dipole elements on both sides of the first slot;
a second slot arranged parallel to the upper edge of the plate-shaped radiating element and forming a first folded element on the upper side thereof;
a third slot arranged parallel to the lower edge of the plate-shaped radiating element and forming a second folded element on its lower side;
a fourth slot arranged in parallel with the upper edge of the plate-shaped radiating element from the left edge of the plate-shaped radiating element up to a portion near the center point;
a fifth slot provided in parallel with the upper edge of the plate-shaped radiating element from the right edge of the plate-shaped radiating element up to a portion near the center point; and
and feeding points are arranged between the first slot and the fourth slot and between the first slot and the fifth slot.
3. An antenna operable to receive electromagnetic waves transmitted in the form of horizontally polarized waves, the directivity of the antenna in a horizontal plane having an omnidirectional characteristic, the antenna comprising:
a flat plate-shaped radiation element formed by bending a substantially rectangular-shaped metal plate into a polygonal shape more than or equal to a quadrangle;
a first slot formed vertically from a portion near a lower edge of the plate-shaped radiating element to a portion near an upper edge of the plate-shaped radiating element while passing through a center point of the plate-shaped radiating element and forming plate-shaped dipole elements on both sides of the first slot;
a second slot arranged parallel to the upper edge of the plate-shaped radiating element and forming a first folded element on the upper side thereof;
a third slot arranged parallel to the lower edge of the plate-shaped radiating element and forming a second folded element on the lower side thereof; and
and feeding points provided on both sides of the first slot.
4. An antenna, comprising:
an antenna element formed by a plate-shaped radiation element formed by bending a substantially rectangular-shaped metal plate into a polygonal shape or a circular shape more than or equal to a quadrangle, the antenna element being capable of receiving electromagnetic waves transmitted in the form of horizontally polarized waves, the directivity of the antenna element in a horizontal plane having omnidirectional characteristics, the plate-shaped radiation element having:
a first slot provided vertically in a portion from a lower edge of the plate-shaped radiating element up to a vicinity of an upper edge of the plate-shaped radiating element while passing through a center point of the plate-shaped radiating element and forming plate-shaped dipole elements on both side surfaces of the first slot;
a second slot formed in parallel with an upper edge of the plate-shaped radiating element and forming a folding element on an upper side thereof; and
a feeding point provided on the lower edge of the plate-shaped radiating element on both sides of the first slot; and
a cover covering the antenna member, having a cylindrical shape or a polygonal cylindrical shape; wherein,
the length of the shield on one side of the intersecting polarization plane is longer than the length of the shield on one side of the polarization plane.
5. The antenna of claim 4, further comprising a base secured to the cover.
6. The antenna according to claim 4, further comprising an output element that outputs a signal based on the electromagnetic wave received by the antenna element.
7. The antenna of claim 4, further comprising an outdoor mounting fixture secured to the cover.
8. The antenna of claim 4, further comprising a support member integrally or detachably provided on the cover and selectively fixable with one of the indoor mounting base and the outdoor mounting fixture.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP192060/2005 | 2005-06-30 | ||
| JP2005192060A JP4304171B2 (en) | 2005-06-30 | 2005-06-30 | Wideband antenna for UHF band |
| JP196436/2005 | 2005-07-05 | ||
| JP2005196436A JP2007019624A (en) | 2005-07-05 | 2005-07-05 | Vertical stack antenna |
| JP2005277923A JP4620559B2 (en) | 2005-09-26 | 2005-09-26 | Indoor and outdoor antennas |
| JP277923/2005 | 2005-09-26 | ||
| PCT/JP2006/305160 WO2007004340A1 (en) | 2005-06-30 | 2006-03-15 | Antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101213707A CN101213707A (en) | 2008-07-02 |
| CN101213707B true CN101213707B (en) | 2012-09-19 |
Family
ID=37751490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200680024016XA Expired - Fee Related CN101213707B (en) | 2005-06-30 | 2006-03-15 | Antenna |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4304171B2 (en) |
| CN (1) | CN101213707B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4841398B2 (en) * | 2006-10-27 | 2011-12-21 | 京セラ株式会社 | Loop antenna, antenna board, antenna integrated module and communication device |
| JP4938561B2 (en) * | 2007-06-22 | 2012-05-23 | 株式会社エヌエイチケイアイテック | Antenna device and horizontal polarization non-directional antenna for horizontal polarization |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6486843B2 (en) * | 2000-08-21 | 2002-11-26 | Harada Industry Co., Ltd. | On-vehicle rod antenna device |
| US6624793B1 (en) * | 2002-05-08 | 2003-09-23 | Accton Technology Corporation | Dual-band dipole antenna |
| CN1467874A (en) * | 2002-06-19 | 2004-01-14 | 安德鲁公司 | Single piece twin folded dipole antenna |
| CN1701466A (en) * | 2003-08-05 | 2005-11-23 | 日本安特尼株式会社 | Reflecting plate-equipped planar antenna |
-
2005
- 2005-06-30 JP JP2005192060A patent/JP4304171B2/en not_active Expired - Fee Related
-
2006
- 2006-03-15 CN CN200680024016XA patent/CN101213707B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6486843B2 (en) * | 2000-08-21 | 2002-11-26 | Harada Industry Co., Ltd. | On-vehicle rod antenna device |
| US6624793B1 (en) * | 2002-05-08 | 2003-09-23 | Accton Technology Corporation | Dual-band dipole antenna |
| CN1467874A (en) * | 2002-06-19 | 2004-01-14 | 安德鲁公司 | Single piece twin folded dipole antenna |
| CN1701466A (en) * | 2003-08-05 | 2005-11-23 | 日本安特尼株式会社 | Reflecting plate-equipped planar antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101213707A (en) | 2008-07-02 |
| JP2007013609A (en) | 2007-01-18 |
| JP4304171B2 (en) | 2009-07-29 |
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