JP5404292B2 - Antenna device - Google Patents

Description

  The present invention relates to an antenna device used for the UHF band.

  Conventionally, a Yagi-type antenna (Yagi-Uda antenna) has been widely used as an antenna device that receives radio waves in the UHF band.

  Yagi-type antenna has a radiator connected to the feeder, a plurality of waveguides shorter than the radiator, a reflector longer than the radiator, and an antenna support that supports the director, the radiator and the reflector. With a bar. Each of the director, the radiator, and the reflector is usually configured by a linear antenna element.

  Yagi antennas are known to have better characteristics as the number of directors increases. However, the larger the number of directors, the larger the overall antenna size. And there is a problem in terms of safety.

  In view of such a situation, an antenna structure has been proposed in which each of the directors and the radiators is configured by an annular antenna element, and the Yagi-type antenna is miniaturized while suppressing deterioration in characteristics. (See Patent Document 1).

JP 2008-136191 A (FIGS. 3 and 5)

  However, as in the antenna structure described in Patent Document 1, there is a problem that the characteristics cannot be sufficiently improved only by configuring each of the directors and the radiators by annular antenna elements.

  Furthermore, in the director described in Patent Document 1, two loop members are disposed apart from each other with the antenna support rod interposed therebetween, and there is room for improvement in terms of downsizing the director.

  Therefore, an object of the present invention is to provide an antenna device for the UHF band, which has improved characteristics and is reduced in size.

  In order to solve the above-described problems, the present invention has the following features. First, the first feature of the present invention is that a radiator (radiator 120) connected to a power feeding unit (power feeding unit 170), a plurality of waveguides (waveguide 110) shorter than the radiator, A UHF band antenna device (antenna device 100) in which a reflector (reflector 130) longer than the radiator is supported by an antenna support rod (antenna support rod 150), the waveguide, the radiator And at least the waveguide of the reflectors is formed in a rectangular shape and has a conductive frame (conductive frame 111) having an opening surface directed in the direction of arrival of radio waves (direction D4), and the conductive frame. A first conductive partition (conductive partition 112) provided from the center of one long side (long side 111a) of the body to the center of the other long side (long side 111b); , One short side (short side 111c) of the conductive frame and the A second conductive partition portion (conductive partition portion 113) provided from the one long side portion to the other long side portion at a position between the first conductive partition portion and the first conductive partition portion; Provided at the position between the other short side portion (short side portion 111d) of the sex frame and the first conductive partitioning portion from the one long side portion to the other long side portion. A gist is provided with a third conductive partition portion (conductive partition portion 114), and four loops are configured by the conductive frame and the first to third conductive partition portions.

  According to such a configuration, four loops are formed by the conductive frame and the first to third conductive partition portions, so that incoming radio waves can be received efficiently and characteristics can be improved. it can. Specifically, the two inner loops operate as a loop antenna, and electric lines of force are generated from one long side (long side) of the loop toward the other long side (long side). The outer two loops generate electric lines of force in the same direction as the wide loop, which contributes to strengthening the radio waves, but also plays a role of impedance matching.

  Further, the interval between each of the four loops can be minimized, and the size can be reduced.

  Therefore, according to the present invention, it is possible to provide an antenna device for the UHF band, which has improved characteristics and a reduced size.

  A second feature of the present invention relates to the first feature of the present invention, wherein the distance (interval W11) between the one short side portion and the second conductive partition portion is the first conductive partition portion. And the interval (interval W13) between the second conductive partition portions is narrower than the interval (interval W12) between the other short side portion and the third conductive partition portion. And it makes it a summary to be narrower than the space | interval (space | interval W14) of a said 3rd electroconductive partition part.

  According to such a configuration, the outer two loops of the four loops are narrower than the inner two loops. The two inner wide loops operate as a loop antenna, and electric lines of force are generated from one long side (long side) of the loop toward the other long side (long side). The outer narrow loop generates electric lines of force in the same direction as the wide loop, which contributes to strengthening the radio wave, but the outer narrow loop also plays a role of impedance matching.

  A third feature of the present invention relates to the first feature or the second feature of the present invention, wherein the longer side and the shorter side of the conductive frame become shorter as the director is further away from the radiator. The gist is to be configured as follows.

  According to such a feature, an antenna with higher directivity (higher gain) can be obtained by configuring the director so that the longer side and the shorter side of the conductive frame become shorter as the distance from the radiator increases. Can be operated as Therefore, the characteristics of the antenna device can be further improved.

  A fourth feature of the present invention relates to any one of the first to third features of the present invention, wherein each of the waveguide, the radiator, and the reflector includes the conductive frame and the first. The gist of the present invention is that it is constituted by a third conductive partition.

  According to such a configuration, since four loops are formed not only in the director but also in each of the radiator and the reflector, the incoming radio wave can be received more efficiently and the characteristics can be improved. it can. In addition, since the radiator and the reflector can be reduced in size, the entire antenna device can be reduced in size.

  A fifth feature of the present invention is according to the fourth feature of the present invention, and is summarized in that the power feeding unit is connected to the first conductive partition portion of the radiator.

  According to such a structure, the 1st electroconductive partition part of a radiator can be used effectively by providing an electric power feeding part in the 1st electroconductive partition part of a radiator.

  A sixth feature of the present invention relates to the fourth or fifth feature of the present invention, wherein each of the first conductive partition portions of the director, the radiator and the reflector is the antenna support. The main point is that it is attached to a rod.

  According to such a configuration, the first conductive partition portion of each of the director, the radiator, and the reflector is used for attachment to the antenna support rod, so that the director, the radiator, and the reflector are used. Each of the first conductive partition portions can be effectively used to contribute to downsizing of the antenna device.

  A seventh feature of the present invention relates to any one of the first to sixth features of the present invention, wherein the one short side portion, the other short side portion, and the first to third conductive partitions. Each section is arranged along the vertical direction.

  According to such a configuration, five receiving portions corresponding to the vertical direction are configured by one short side portion, the other short side portion, and the first to third conductive partition portions. A wave (V polarized wave) can be received well. Also, radio waves arriving in a state where the polarization plane of vertical polarization is inclined can be received well by the two long side portions arranged along the horizontal direction.

  ADVANTAGE OF THE INVENTION According to this invention, it is an antenna apparatus for UHF bands, Comprising: The antenna apparatus with which the characteristic was improved and size reduction was achieved can be provided.

It is a perspective view of an antenna device concerning this embodiment of the present invention. It is an expansion perspective view of the director concerning this embodiment of the present invention. FIG. 3A is a plan view of the antenna device according to this embodiment of the present invention, and FIG. 3B is a side view of the antenna device according to this embodiment of the present invention. It is a front view of the antenna apparatus which concerns on this embodiment of this invention. It is a figure which shows the directivity pattern in the E surface of the antenna device which concerns on this embodiment of this invention.

  Next, an antenna device according to an embodiment of the present invention will be described with reference to the drawings. In the description of the drawings in the following embodiments, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

  FIG. 1 is a perspective view of an antenna device 100 according to the present embodiment. The antenna device 100 is applied to, for example, a radio relay transmission device (FPU) for television broadcasting. The antenna device 100 receives radio waves in the UHF band, specifically, 800 MHz band (770 MHz to 806 MHz). In the present embodiment, the antenna device 100 is configured to receive vertically polarized waves (V polarized waves).

  As shown in FIG. 1, the antenna device 100 includes a radiator 120 connected to the power feeding unit 170, a plurality of directors 110 (waveguides 110 a to 110 h) shorter than the radiator 120, and the radiator 120. The antenna device 100 for the UHF band in which the long reflector 130 is supported by the antenna support bar 150. Thus, the basic configuration of the antenna device 100 is the same as that of the Yagi type antenna (Yagi-Uda antenna).

  The antenna support rod 150 is formed in a prismatic shape, and is attached to the support column 200 via a non-conductive attachment member 160. Specifically, the antenna device 100 is in a substantially horizontal state, and the director 110 side is directed to the arrival direction D4 of the radio wave.

  The director 110a includes a conductive frame 111 (long side part 111a, long side part 111b, short side part 111c, short side part 111d), first conductive partition part 112, and second conductive partition part 113. And a third conductive partition 114.

  The conductive frame 111 is formed in a rectangular shape, and the opening surface is directed to the arrival direction D4 of the radio wave. The conductive frame 111 includes a long side portion 111a, a long side portion 111b, a short side portion 111c, and a short side portion 111d. The long side portion 111a and the long side portion 111b are arranged in the horizontal direction. The short side portion 111c and the short side portion 111d are arranged in the vertical direction.

  In the following, the horizontal direction along the long side portion 111a and the long side portion 111b is referred to as “width direction D1”, and the horizontal direction along the antenna support bar 150 is referred to as “length direction”. The direction along the short side portion 111c and the short side portion 111d in the vertical direction is referred to as a “height direction D3”.

  The first conductive partition 112 is provided from the center of one long side 111a to the center of the other long side 111b. The first conductive partition 112 is attached to the antenna support bar 150 via a non-conductive attachment member 115.

  The second conductive partition 113 is formed from one long side 111a to the other long side at a position between one short side 111c of the conductive frame 111 and the first conductive partition 112. 111b is provided.

  The third conductive partition 114 is formed from one long side 111a to the other long side at a position between the other short side 111d of the conductive frame 111 and the first conductive partition 112. 111b is provided.

  In this manner, the conductive frame 111 and the first to third conductive partition portions 112 to 114 constitute four loops. Specifically, a first loop is configured by the long side portion 111a, the long side portion 111b, the short side portion 111c, and the second conductive partition portion 113. The long side 111a, the long side 111b, the first conductive partition 112, and the second conductive partition 113 form a second loop. The long side portion 111a, the long side portion 111b, the first conductive partition portion 112, and the third conductive partition portion 114 constitute a third loop. The long side portion 111a, the long side portion 111b, the short side portion 111d, and the third conductive partition portion 114 constitute a fourth loop.

  FIG. 2 is an enlarged perspective view of the director 110a. As shown in FIG. 2, the conductive frame 111 and the first to third conductive partition portions 112 to 114 are formed by bending a plate-shaped conductive material. The long side portion 111a, the short side portion 111c, and the short side portion 111d are integrally formed. The lower ends of the short side portion 111c and the short side portion 111d are connected to the long side portion 111b by screws 116d and 116g.

  The upper end portion of the first conductive partition 112 is connected to the long side portion 111a by a screw 116b, and the lower end portion is connected to the long side portion 111b by a screw (not shown). The upper end portion of the second conductive partition 113 is connected to the long side portion 111a by a screw 116a, and the lower end portion is connected to the long side portion 111b by a screw 116e. The upper end of the third conductive partition 114 is connected to the long side 111a by a screw 116c, and the lower end is connected to the long side 111b by a screw 116f.

  The first conductive partition 112 is attached to the antenna support bar 150 via a non-conductive attachment member 115. Specifically, the attachment member 115 fixed to the first conductive partition 112 is attached to the antenna support bar 150 by a bolt 117 inserted through the antenna support bar 150.

  As shown in FIG. 1, the other directors 110b to 110h are configured in the same manner as the director 110a. Further, the radiator 120 and the reflector 130 are configured in the same manner as each of the directors 110.

  The radiator 120 includes a conductive frame 121 (long side part 121a, long side part 121b, short side part 121c, short side part 121d), a first conductive partition part 122, and a second conductive partition part. 123 and a third conductive partition 124. The conductive frame body 121 and the first to third conductive partition portions 122 to 124 constitute four loops. The first conductive partition 122 of the radiator 120 is connected to the power feeding unit 170.

  The reflector 130 includes a conductive frame 131 (long side part 131a, long side part 131b, short side part 131c, short side part 131d), a first conductive partition part 132, a second conductive partition part 133, And a third conductive partition 134. The conductive frame 131 and the first to third conductive partition portions 132 to 134 constitute four loops.

  FIG. 3A is a plan view of the antenna device 100, and FIG. 3B is a side view of the antenna device 100. FIG. 4 is a front view of the antenna device 100.

  As shown in FIGS. 3A and 3B, the length (D2 direction) of the antenna device 100 is about 1139 mm, and the maximum width (D1 direction) of the antenna device 100 is about 397 mm. As shown in FIG. 4, the maximum thickness (D3 direction) of the antenna device 100 is about 70 mm.

  In the present embodiment, the thickness of the antenna device 100 (that is, the length of the short side portion) is about 0.17λ (about λ / 6). Here, λ means a wavelength corresponding to the radio wave to be received by the antenna device 100.

  The distance between the radiators 110 (D2 direction), the distance between the radiators 110 and 120 (D2 direction), and the distance between the radiators 120 and the reflector 130 (D2 direction) are about λ / 4.

  Further, as shown in FIG. 3A, the width (D1 direction) of each loop is about 0.13 to 0.15λ. In the present embodiment, as shown in FIG. 3, in the waveguide 110a, the interval W11 between the one short side portion 111c and the second conductive partition portion 113 is the first conductive partition portion 112 and the second conductive partition portion 113. It is narrower than the interval W12 of the conductive partition 113. The interval W13 between the other short side portion 111d and the third conductive partition portion 114 is narrower than the interval W14 between the first conductive partition portion 112 and the third conductive partition portion 114.

  The width (D1 direction) of each of the director 110, the radiator 120, and the reflector 130 is designed on the basis of 1λ. The lengths of the intervals W11 and W13 and the lengths of the intervals W12 and W14 are based on 1/6 to 1 / 10λ.

  As shown in FIGS. 3 and 4, the longer the short side portion and the short side portion of the conductive frame 111 are, the shorter the wave guide 110 is from the radiator 120, that is, the direction of arrival of the radio wave is. Composed.

  FIG. 5 is a diagram illustrating a directivity pattern on the E plane of the antenna device 100. In the present embodiment, the half-value angle is set wider than that of a normal Yagi antenna so as to be able to cope with the case where the arrival direction of the radio wave varies due to the influence of a reflected wave or the like.

  As described above, according to the present embodiment, the conductive frame body 111 and the first to third conductive partition portions 112 to 114 constitute four loops, so that incoming radio waves can be efficiently transmitted. It can be received and the characteristics can be improved. Further, the interval between the four loops can be minimized, and the antenna device 100 can be downsized.

  In the present embodiment, four loops are formed not only in the director 110 but also in each of the radiator 120 and the radiator 130, so that incoming radio waves can be received more efficiently and characteristics can be improved. it can. In addition, since the radiator 120 and the radiator 130 can be reduced in size, the entire antenna device 100 can be reduced in size.

  In particular, the antenna device 100 according to the present embodiment has a bit error rate at the time of demodulation and decoding (even when the received power of radio waves fluctuates, the inclination of the polarization plane is large, or the received power is small compared to the existing antenna. BER) can be improved.

  In the present embodiment, each of the director 110, the radiator 120, and the radiator 130 includes five reception portions in the vertical direction, so that the vertical polarization (V polarization) can be received well. Further, since each of the waveguide 110, the radiator 120, and the radiator 130 includes two horizontal receiving portions, it is satisfactory even when the polarization plane of vertical polarization arrives in an inclined state. Can be received.

  As mentioned above, although this invention was described by embodiment, it should not be understood that the description and drawing which form a part of this indication limit this invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the above-described embodiment, the antenna device 100 has been described as receiving radio waves in the 800 MHz band (770 MHz to 806 MHz), but can be applied to other UHF bands such as 460 MHz.

  In the embodiment described above, each of the director 110, the radiator 120, and the radiator 130 constitutes four loops, but only the director 110 may constitute four loops. Since the proportion of the size occupied by the waveguide 110 is large in the overall size of the antenna device 100, if the size of the waveguide 110 is reduced, the size of the entire antenna device 100 can be significantly reduced.

  Note that the antenna device according to the present invention is not limited to being used exclusively for reception, but may be used for transmission.

  Thus, it should be understood that the present invention includes various embodiments and the like not described herein. Therefore, the present invention is limited only by the invention specifying matters in the scope of claims reasonable from this disclosure.

  DESCRIPTION OF SYMBOLS 100 ... Antenna apparatus, 110 ... Waveguide, 111 ... Conductive frame, 111a, 111b ... Long side part, 111c, 111d ... Short side part, 112 ... 1st electroconductive partition part, 113 ... 2nd electroconductivity , 114 ... third conductive partition part, 115 ... mounting member, 116 ... screw, 117 ... bolt, 120 ... radiator, 121 ... conductive frame, 121a, 121b ... long side part, 121c, 121d ... short side part 122 ... first conductive partition part 123 ... second conductive partition part 124 ... third conductive partition part 130 ... reflector 130 ... radiator 131 ... conductivity Frame body, 131a, 131b ... long side portion, 131c, 131d ... short side portion, 132 ... first conductive partition portion, 133 ... second conductive partition portion, 134 ... third conductive partition portion, 150 ... Antenna support rod, 160 ... Mounting member 170 ... feeding unit, 200 ... posts

Claims (7)

An antenna device for a UHF band in which a radiator connected to a power feeding unit, a plurality of waveguides shorter than the radiator, and a reflector longer than the radiator are supported by an antenna support rod, Of the director, the radiator, and the reflector, at least the director is:
A conductive frame that is formed in a rectangular shape and whose opening face is directed in the direction of arrival of radio waves;
A first conductive partition provided from the center of one long side of the conductive frame to the center of the other long side;
Second conductivity provided from the one long side portion to the other long side portion at a position between one short side portion of the conductive frame and the first conductive partition portion. Sex partition,
Third conductive provided from the one long side to the other long side at a position between the other short side of the conductive frame and the first conductive partition. A sex partition,
An antenna device, wherein four loops are configured by the conductive frame and the first to third conductive partitions. An interval between the one short side portion and the second conductive partition portion is narrower than an interval between the first conductive partition portion and the second conductive partition portion,
The distance between the other short side portion and the third conductive partition portion is narrower than the distance between the first conductive partition portion and the third conductive partition portion. The antenna device described.   The antenna device according to claim 1, wherein the director is configured such that a long side portion and a short side portion of the conductive frame are shortened as the distance from the radiator increases.   Each of the said director, the said radiator, and the said reflector is comprised by the said electroconductive frame and the said 1st-3rd electroconductive partition part, The any one of Claims 1-3 characterized by the above-mentioned. An antenna device according to claim 1.   The antenna apparatus according to claim 4, wherein the power feeding unit is connected to the first conductive partition of the radiator.   6. The antenna device according to claim 4, wherein the first conductive partition portion of each of the director, the radiator, and the reflector is attached to the antenna support rod. Each of the one short side part, the other short side part, and the first to third conductive partition parts are arranged along a vertical direction,
Each of said one long side part and said other long side part is arrange | positioned along a horizontal direction, The antenna device as described in any one of Claims 1-6 characterized by the above-mentioned.

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