JPH07273531A - Television antenna in common use for uhf and vhf - Google Patents

Abstract

PURPOSE:To obtain the UHF, VHF common use television antenna whose size is made small with excellent performance. CONSTITUTION:The television antenna has a waveguide unit 1 and a reflector 2, a support shaft 6 is stood upright to an antenna base 5, a board 7 is provided on the support shaft 6 in a free horizontal rotation, support shafts 8, 9 are stood upright on the board 7, a middle part of a UHF dipole 31 is fitted to the support shaft 8 and a middle part of a VHF dipole 32 is fitted to the support shaft 9 respectively. Then plural LC circuits are provided opposite to the UHF dipole 3, and the VHF dipole 3, a matching device 10 is provided on the board 7 and the matching device 10 and the LC circuits are connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a UHF / VHF common antenna.

[0002]

2. Description of the Related Art Since the start of television broadcasting, television antennas have been installed on the roof to receive radio waves.

The Yagi method, which is composed of a director, a receiver, and a reflector, is the main method, and the reception efficiency increases as the number of elements increases, and it is used to respond to the radio wave conditions in the area. However, since it is large in size and it is mainly mounted on the roof, the construction is troublesome, and there are various problems such as damage and corrosion due to wind, rain and snow. Also, because the UHF and VHF antennas are separate, it was necessary to attach two booms to one pole and set each boom at the transmitting station or relay station. UV-sharing products are also commercially available, but when the UHF and VHF transmitting stations were in different directions, there were many cases where their performance could not be fully exhibited due to the directivity.

In the present invention, a television antenna is miniaturized by arranging a plurality of LC circuits on a dipole, the direction of the dipole is made variable, and a director / reflector is incorporated in the upper, lower, and rear parts thereof to form an antenna. UHF, VHF
It is a technical issue to provide a shared television antenna.

[0005]

The gist of the present invention will be described with reference to the accompanying drawings.

A television antenna having a director 1 and a reflector 2 is related to a UHF / VHF television antenna in which a plurality of LC circuits 4 are provided opposite to a dipole 3.

Further, in a television antenna having a director 1 and a reflector 2, a pivot shaft 6 is erected on an antenna base 5,
A substrate 7 is horizontally rotatably provided on the pivot shaft 6, and support shafts 8 and 9 are erected on the substrate 7, and the UHF dipole 3 is mounted on the support shaft 8.
₁ of the central portion, the central portion of the VHF dipole 3 ₂ respectively pivotally fastened to the support shaft 9, a plurality of LC circuit 4 to the respective UHF dipole 3 _1, VHF dipole 3 ₂ contraposed Then, the matching device 10 is provided on the substrate 7, and the matching device 10 and the LC circuit 4 are connected to each other, that is, UHF and VH.
This relates to the F shared TV antenna.

[0008]

The operation of claim 1 will be described with reference to FIG.

Six LC circuits 4 of a, b, c, d, e, and f are provided opposite to the dipole 3.

In the high UHF channel, the D and E parts operate similarly to the tri-band doublet antenna.

LC circuit a between C and D and between E and F,
Since b resonates in parallel in a high UHF channel, it exhibits high impedance at that wavelength, and A, B, C,
The F, G, and H parts are electrically disconnected in the high UHF channel.

Next, in the channel of low UHF, C and D
And the E and F parts operate similarly to the tri-band doublet. L between B and C and between F and G
Since the C circuits c and d resonate in parallel in the low UHF channel, they show high impedance at that frequency.
The portions B and G and G and H are electrically separated.

At this time, the LC circuits a and b between C and D and between E and F exhibit inductive properties, and serve as a loading coil in a channel having a low UHF, and have the same function as a loading dipole antenna. .

In the high VHF channel, the four inner LC circuits a, b, c and d all exhibit inductive properties and play the role of loading coils. The B, C and D parts and the G and F parts. The portion E operates in the same way as the tri-band doublet antenna. L between A and B and G and H
Since the C circuits e and f resonate in parallel in a channel having a high VHF, they show high impedance at that frequency, and
The portions H and H are electrically isolated in the channel with high VHF.

Further, in the channel having a low VHF, a,
All six LC circuits b, c, d, e and f are inductive and play the role of a loading coil. The parts A, B, C and D and the parts H, G, F and E are tried. Works the same as a band doublet antenna.

The operation of claim 2 will be described with reference to FIGS.

FIG. 3 is a plan view showing the configuration of the invention according to claim 2, and FIG. 4 is a side view of the same.

A pivot shaft 6 is erected on the antenna base 5, a substrate 7 is provided on the pivot shaft 6 so as to be horizontally rotatable, and support shafts 8 and 9 are erected on the base plate 7. The central portion of the UHF dipole 3 ₁ is axially attached and fixed, and LC circuits 4 of a ₁ and b ₁ are provided opposite to both ends of the dipole 3 ₁ , and the center of the VHF dipole 3 ₂ is provided on the support shaft 9. The parts are axially attached and fixed, LC circuits 4 of c ₁ and d ₁ are provided opposite to both ends of the dipole 3 ₂ , a matching device 10 is provided on a substrate 7, and the matching device 10 is provided with the LC circuit. 4 a ₁ , b ₁ , c ₁ , d ₁ are connected.

In the high UHF channel, the LC circuit a ₁
Portion of the coupling portion B ₁ between connecting portion A ₁ and the LC circuit b ₁ and matching device 10 between the matching unit 10 and operates in the same way as a tri-band doublet antenna. Since the LC circuit 4 of a ₁ and b ₁ resonates in parallel in a high UHF channel, it exhibits a high impedance at that frequency, and the portion C ₁ on the dipole 3 ₁ between a ₁ and b ₁ has a high UHF channel. , Electrically disconnected.

A ₁ , B ₁ , C in the low UHF channel
The part ₁ operates as a held dipole antenna.

In the high VHF channel, the LC circuit c
₁ a connecting portion D ₁ and the LC circuit d ₁ and part of the connecting portion E ₁ between matching device 10 between the matching unit 10 operates in the same way as a tri-band doublet. Since the LC circuit 4 of c ₁ and d ₁ resonates in parallel in a channel having a high VHF, it exhibits a high impedance at that frequency, and the portion F ₁ on the dipole 3 ₂ between c ₁ and d ₁ has a channel of a high VHF. Then it will be electrically disconnected.

For low VHF channels, D ₁ , F ₁ ,
The portion E ₁ operates as a held dipole antenna.

This antenna is mounted on the roof or on the wall surface of the house, and the substrate 7 is rotated around the pivot shaft 7 to be fixed to the UHF.
The dipole 3 ₁ and VHF _{2 2} are pivotally adjusted about the support shafts 8 and 9 and fixed in a direction in which the image receiver has a good image.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The attached drawings show a preferred embodiment of the present invention. FIGS. 1 and 2 are explanatory views showing the structure of the invention according to claim 1, and FIGS. 7A, 7B, 7C, 7D, 7E, 7F, 7G, 7E, 7G, 7E, 7G, 7E, 7G, 7E, 7G, 7E, 7G, 7E, 7G, 7E, 7G, 7E, and 7C are views showing an embodiment of the invention.

An embodiment according to claim 1 will be described.

FIG. 1 is an explanatory view showing the configuration of the invention described in claim 1, and since this description has been described in detail in the section of the operation described in claim 1, it will be omitted. A, b, c, d, e, f on the dipole 2
By installing the six LC circuits 4 of
In addition to being able to be used as a TV antenna for VHF, the length of the dipole 3 can be made as compact as about 70 cm because the LC circuit 4 functions as a loading coil. Further, by increasing the number of LC circuits 4, a higher performance dipole can be obtained, so that an antenna incorporating the dipole 2 suitable for it can be selected depending on the number of channels in the area.

FIG. 2 is an explanatory diagram showing another structure of claim 1, in which six LCs are provided in the held type dipole antenna 3 _3.
The circuits a ₂ , b ₂ , c ₂ , d ₂ , e ₂ and f ₂ are attached.

In the high UHF channel, the A ₂ and G ₂ portions operate similarly to the doublet antenna. Since the LC circuit 4 of a ₂ and b ₂ resonates in parallel in the channel of high UHF, it exhibits a high impedance at that frequency, and
The portions of ₂ , C ₂ , D ₂ , E ₂ , and F ₂ are electrically disconnected in the high UHF channel.

In the low UHF channel, the A ₂ and B ₂ portions and the G ₂ and F ₂ portions operate in the same manner as the doublet antenna. Since the LC circuit 4 of c ₂ and d ₂ resonates in parallel in the low UHF channel, it exhibits a high impedance at that frequency, and the C ₂ , D ₂ and E ₂ portions are electrically separated in the low UHF channel. It will be in a state of being broken.

For channels with high VHF, C ₂ , B ₂ and A
The portion _{2 and} the portions E ₂ , F ₂ and G ₂ operate in the same manner as the doublet antenna. The LC circuit 4 of e ₂ and f ₂ is VH
Since it resonates in parallel in the high F channel, it exhibits high impedance at that frequency, and the portion D ₂ becomes electrically disconnected in the high VHF channel.

For channels with low VHF, A ₂ , B ₂ ,
_{C 2, D 2, E 2} , F 2, G 2 parts operate as formate dead dipole antenna.

An embodiment of claim 2 will be described.

FIGS. 3 and 4 are explanatory views showing the configuration of the invention described in claim 2, and this description is omitted because it has been described in detail in the section of the operation described in claim 2. When the directions of UHF and VHF are different, two dipoles with two LC circuits 4 attached are attached to one board 7, and each LC circuit 4 is connected to the matching box 10 with a coaxial cable. Moreover, the direction of the dipole can be changed.

FIG. 5 is a modification of the one described with reference to FIGS. 3 and 4, and when UHF and VHF have the same orientation, a ₃ , d ₃ , and b ₃ are placed in a state of facing one dipole 3 to the left and right. ，
The four LC circuits 4 of c ₃ are provided and are connected to the matching device 10 from both ends of the dipole 3 by the coaxial cables D ₃ and G ₃ , and b
The LC circuit ends of ₃ and c ₃ are connected to the matching box 10 by the coaxial cables A ₃ and B ₃
It is explanatory drawing which shows the case where it connects with.

Similar to the above, in the high UHF channel, the portions A ₃ and B ₃ operate in the same manner as the doublet antenna. Since the LC circuit 4 of b ₃ and c ₃ resonates in parallel in the high UHF channel, it exhibits a high impedance at that frequency, and the C ₃ portion is electrically disconnected in the high UHF channel.

A ₃ , B ₃ , C in the low UHF channel
Part ₃ operates as a held antenna.

In the high VHF channel, the portions D ₃ and G ₃ operate similarly to the doublet antenna. a ₃
Since the LC circuit 4 of d ₃ and d ₃ resonates in parallel in the channel with high VHF, it exhibits a high impedance at that frequency, and the portions E ₃ , C ₃ , F ₃ are electrically isolated in the channel with high VHF. It is in.

For channels with low VHF, D ₃ , E ₃ , C
The portions ₃ , ₃ , F ₃ and G ₃ operate as a held dipole antenna.

FIG. 6 is a combination of three of FIG. 4, in which three dipoles 3 are axially attached and fixed at the center, and two LC circuits 4 are provided on each of the dipoles 3 on the left and right sides. Matching devices are connected by connecting both ends of the dipole 3 facing each other.
Each of the LC circuits 4 connected to the shaft mounting portion 10 is connected to each other and the connection ends thereof are connected to the matching device 10. The directivity is wide, and the operation is the same as in FIG.

FIGS. 7, 8, 9 and 10 show one embodiment of the present invention, in which a pivot shaft 6 is erected in the center of the antenna base 5, and the pivot shaft 6 is mounted on a substrate 7. The base plate 7 is provided so as to be horizontally rotatable with respect to the pivot shaft 6 by inserting the pivot hole provided and tightening with a nut, and the base of the locking piece is fixed to the pivot shaft 6 above the nut. The other end is projected rearward, and a UHF dipole 3 ₁ is laterally mounted on this protruding end, and a support shaft 9 is erected on a substrate 7 behind the pivot shaft 6, and a VHF dipole is supported on the support shaft 9. 3 ₂ dipoles for UHF and pivotally attached to the central portion 3 _1, the UHF dipole 3 ₂ provided horizontally angularly movable on the substrate 7.

Hollow tube 12 forward from the antenna base 5
Then, three to five UHF waveguides 1 ₁ are installed in the hollow tube 12. The illustrated embodiment shows a case in which three UHF waveguides 1 ₁ are installed, and the UHF waveguides 1 ₁ are normally required to have an interval of (wavelength × 1/4). , Considering almost all channels for UHF, it will be about 8 cm to 10 cm. Further, a UHF reflector 2 ₁ is attached to the rear part.

A plurality of VHF waveguides 1 ₂ are provided on the upper diagonal front side and the lower diagonal front side of the VHF dipole 3 ₂ (in the embodiment, _two waveguides and a diagonal front lower portion are arranged at an interval of about 20 cm on the diagonal front upper side. Is attached to the VHF dipole 3 ₂ and a VHF reflector 2 ₂ is provided behind the VHF dipole 3 ₂ .

LC circuits 4 of a ₁ and b ₁ are attached to both ends of the UHF dipole 3 ₁ as shown in FIGS.
Similarly, LC circuits 4 of c ₁ and d ₁ are attached to both ends of the dipole 3 ₂ for use as shown in FIGS. 7 and 8, and the coaxial cables A ₁ and B ₁ are attached to the respective LC circuits and the matching box 10 provided on the substrate 7. , C ₁ and D ₁
Connect with.

Since this embodiment is constructed as described above, U
When the orientations of HF and VHF are different, the substrate 7 is rotated around the pivot shaft 6 to adjust the position of the UHF dipole 3 ₁ , and then the VHF dipole 3 ₂ is moved around the support shaft 9. Adjust the rotation to fix it in the place with the best image.

Regarding the director 1 and the reflector 2, the number of elements is manufactured in various types at the manufacturing stage, and the demand is answered depending on the radio wave condition.

Further, the idea of claim 1 may be incorporated into the director 1 and the reflector 2, and the LC circuit 4 may be incorporated to further reduce the size.

When UHF and VHF come from almost the same direction, a corner reflector antenna 13 is attached as the reflector 2 as shown by the chain double-dashed line in FIG. 7 to improve the gain and FB ratio. In this case, the UHF and VHF reflectors 2 ₁ and 2 ₂ are unnecessary.

Since the embodiment is constructed as described above, the LC
By using the dipole 3 incorporating the circuit and changing the dipole 3, the performance of the antenna is improved, and reception is possible even if the antenna is attached to the wall surface of the house.

Further, by attaching to the wall surface of the house, there is little damage and corrosion due to wind and rain or snow, and there is an economic advantage. Attaching the wall surface of the house requires a mounting angle 14 as shown in FIG. 9, but the construction cost is lower than mounting on the roof. Also, when attaching the antenna to the mounting angle 14, the direction of the antenna body can be adjusted,
Adjustment of the dipole 3 is also reduced.

Further, as shown in FIG. 9, the antenna is housed in an acrylic or plastic antenna box 15 framed by an aluminum plate to further reduce damage and corrosion due to wind and snow, and improve the aesthetic aspect.

[0051]

As described above, according to the present invention, a plurality of LC circuits are paired with a dipole as described above, and the respective LC circuits facing each other are provided so as to resonate at different specific frequencies to obtain a high impedance. , By using the LC circuit as a loading coil by making the LC circuit on the dipole inside the LC circuit inductive, the dipole is provided so as to operate as a loading dipole antenna and a dry band tablet antenna, so that performance is improved. Of the UHF and VH that can receive UHF and VHF with a single dipole.
It becomes an F-shared TV antenna.

A UHF having a plurality of LC circuits arranged in pairs
Dipole for VHF and dipole for VHF are installed horizontally on the board.
Since each dipole and the board are provided so as to be rotatable in the horizontal direction, it is possible to adjust the rotation of each dipole in the respective directions of UHF and VHF, and the LC circuit improves the performance of the antenna, resulting in an averaged reflection. It is a compact and excellent UHF / VHF antenna that can be attached to the wall of a house.

[Brief description of drawings]

FIG. 1 is an explanatory plan view showing the structure of claim 1.

FIG. 2 is a plan view for explaining another configuration of claim 1;

FIG. 3 is an explanatory plan view showing the structure of claim 2.

FIG. 4 is a side view of the above.

FIG. 5 is an explanatory plan view showing another configuration of claim 2.

FIG. 6 is an explanatory plan view showing another configuration of claim 2.

FIG. 7 is a perspective view showing an embodiment of the present invention.

FIG. 8 is a plan view for explaining the above.

FIG. 9 is a side view in which the above part is cut away.

FIG. 10 is an explanatory diagram of an LC circuit.

[Explanation of symbols]

1 Waveguide 2 Reflector 3 Dipole 3 ₁ UHF dipole 3 ₂ VHF dipole 4 LC circuit 5 Antenna stand 6 Pivot axis 7 Substrate 8 Spindle 9 Spindle 10 Matcher

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display part H01Q 23/00

Claims (2)

[Claims] 1. A television antenna having a director and a reflector, wherein the dipole is provided with a plurality of LC circuits as a pair, and the television antenna for both UHF and VHF is provided. 2. A television antenna having a director and a reflector, wherein a pivot shaft is erected on the antenna base, and a substrate is horizontally rotatably provided on the pivot shaft, and a pivot shaft is provided on the substrate. Upright,
The center of the UHF dipole is attached to the support shaft, and the center of the VHF dipole is attached to the support shaft.
A UHF or VHF, wherein a plurality of LC circuits are provided in pairs for the F dipole and the VHF dipole, a matching unit is provided on the substrate, and the matching unit and the LC circuit are connected to each other.
Shared TV antenna.