CN2572569Y - Antenna capable of receiving all direction all-channel television signal - Google Patents

Abstract

The utility model relates to an antenna device capable of receiving omnidirectional all channel television signal, which is formed by that two pairs of VHF-UHF frequency band compatible wide frequency band feeding points of active vibrators are arranged in a purpose-made cross plastic case in a eudipleural orthogonal combination way. The utility model is formed by that the two pairs of the feeding vibrators are orthogonal in water level so as to realize the omnidirectional reception of frequency signals of scores of television channels of VHF-UHF frequency bands. The utility model can be used for families which live in mountainous areas, hilly areas, countryside, cities, and suburbs, can increase the resolution of a television image and accompanying sound, and can obviously increase received channels.

Description

Can receive the antenna assembly of full channel tv signal from all directions

The utility model relates to a kind of antenna assembly of full channel tv signal from all directions that receives, and it belongs to technical field of radio.

At present, because a large amount of heads of China TV station, transposer station build, no matter be that city or rural area mostly are in effective coverage from each different directions TV station, transposer station, for solving this special reception, need to adopt the omni-directional television antenna.And the omni-directional antenna in the past prior art is bulky owing to existing, and the electronic circuit decay is big, easily introduces interference signal, particularly receives reasons such as the strong and weak difference of VHF～uhf band signal level is obvious, and is influential for the quality of user's received television signal.Install interchange and direct current machine additional though some guides antenna into, rotate the direction that changes antenna by motor, this not only bothers, and increases cost, and particularly the motor rotation just had interference for antenna originally, and was also usually fragile.Main shortcoming is that antenna is gyrated, and when receiving the TV signal of a certain direction, regrets and has lost TV signal from other direction, and can't realize comprehensively watching simultaneously.

The purpose of this utility model is that a kind of antenna assembly of full channel tv signal from all directions that receives will be provided.It is to adopt broadband active dipole L1 and L2 symmetrical Orthogonal Composite in horizontal plane of two VHF～uhf band compatibilities to form.Folded dipole conductor (1) and the mutual left-right symmetric of basic wave oscillator conductor (2) that two arms of each active dipole disconnect by a mid point, keep at a certain distance away, parallel placement constitutes, the feed end of active dipole is fixed in the special cross plastic casing, is connected to its custom-designed electronic circuit special electronic device at distributing point.It can receive for carry out omni-directional from VHF1～12 channels, UHF13～57 channel TV signals from all directions.

The purpose of this utility model is achieved in that its active dipole L1 and L2 cut according to certain design length with metal tube (copper, aluminium, iron pipe all can), as the conductor (1) and the conductor (2) of active dipole, being about 1/3rd places in conductor (1) length needs to amount to processing with bending machine respectively.Active dipole conductor (1) and conductor (2) space certain distance, parallel placement is fixed on feed end left-right symmetric Orthogonal Composite in the special cross plastic casing.Plastic casing is to be fixedly installed to the vertical rod upper end that a plastic tube or metal tube are made., on distributing point, install again and connect electronic circuit special electronic device with after distributing point between the conductor (2) is connected at active dipole L1 and L2 conductor (1), use 75 Ω coaxial-cable feeder that signal is imported into the TV set aerial jack and get final product.

The television receiving antenna device that the utility model becomes from all directions all-channel to the active dipole L1 of VHF～uhf band compatibility and L2 Orthogonal Composite, its working band width has surpassed common commercially available antenna.Particularly it has overcome the active dipole of some antennas commonly used when low channel designs, the high channel of working can make and produce reverse current on the oscillator, cause antenna pattern to produce distortion, make impedance mismatching, when high channel designs, the low channel of working also can cause the antenna electrical length to reduce, and antenna radiation resistance and input resistance are reduced, the shortcoming that receiving efficiency descends.Use this device can receive from the TV programme signal of VHF～UHF all-channel from all directions, the TV programme signal that many commercially available antennas commonly used receive bad or the super high band that do not receive for a long time also receives finely, is suitable for nearly tens on the television channel that receives.Clear picture is stable, and sound accompaniment and color are satisfied, and it is less, rational in infrastructure also to have volume simultaneously, handling ease, and cost is low, the characteristics that omnidirectional's performance is good.

The concrete structure of utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is according to the broadband active dipole L1 of the VHF of the antenna assembly of full channel tv signal～uhf band compatibility and the structural representation of L2 from all directions of receiving that the utility model proposes.

Fig. 2 and Fig. 3 are according to the two kinds of pictorial diagram of the antenna assembly of full channel tv signal from all directions that receive that the utility model proposes.

Describe details and working condition in detail below in conjunction with Fig. 1, Fig. 2, Fig. 3 according to the concrete device that the utility model proposes.

Be the concrete structure shape of the broadband active dipole L1 and the L2 of this device VHF～uhf band compatibility shown in Fig. 1.Its composition comprises the folded dipole conductor (1) and the basic half-wave dipole conductor (2) of uhf band symmetry of VHF frequency range mid point open circuit, all is to make of metal tube (copper pipe or aluminum pipe).The length of VHF frequency range folded dipole conductor (1) can be by 1-12 channel geometric average half-wave length design, can be Φ that the metal tube of 10～20mm is amounted at about 1/3rd places of the length of oscillator with bending machine.Basic half-wave dipole conductor (2) length of uhf band symmetry is got half or geometric average Design of length of the centre wavelength of 32 channels usually, certainly, also can design its length by frequency-division section, then with pipe cutting machine intercepting pipe material.

In Fig. 2 and two kinds of material objects shown in Fig. 3, difference is that the plastic casing (4) among Fig. 2 used two, and the plastic casing among Fig. 3 (4) be one integrally-built.VHF frequency range folded dipole conductor (1) and the basic half-wave dipole conductor of uhf band (2) parallel interval certain distance are placed, the feed end left-right symmetric of active dipole conductor (1) and conductor (2) is fixed in the special plastic casing (4).Combination between VHF and uhf band active dipole conductor (1) and the conductor (2) utilizes banded coupler (3), and it is that thick with 1mm, that 5mm is wide copper sheet or aluminium flake bend and form (can certainly connect with lead).It is distributing point that a, a ' locate, and this antenna feed impedance is about 300 Ω, both can use 300 Europe ribbon feeders, and also available 75 Europe coaxial cables are made feeder line.The conductor (1) of the active dipole L1 of said structure and L2, conductor (2), Orthogonal Composite is installed in the special cross plastic casing (4) in horizontal plane respectively, uses from the merit screw and fixes, and at the end of conductor (1) and conductor (2) plastic cap (8) is installed.Plastic casing (4) is fixed on the upper end of vertical rod (5), and vertical rod (5) available metal pipe or ABS plastic pipe are made, and about its length 60～80cm, Φ 2cm is advisable.For high efficiency receives the omni-directional TV signal, for this antenna assembly specialized designs a kind of electronic circuit and electronics dedicated devices, (do not draw among the figure for regent.) can certainly install the feeder line (6) and the plug (7) that connect a broadband line transformer and one 75 Europe characteristic impedance additional the distributing point in the plastic casing (4) with the parallel connection of quarter-wave ribbon feeder, import signal into the TV set aerial jack.Look signal for distance reception light current, can use VHF～UHF wide-band amplifier.In order to improve gain again, also the orthogonal dipole antenna of above-mentioned individual layer can be made the combined antenna battle array (not drawing among the figure) of two layers or four layers.

Should be erected at outdoor application to the said antenna device of making, and should avoid blocking of high-lager building, be selected in spacious place.Can be fixed on vertical rod (5) in other vertical rod, to increase height.

Claims (2)

1, a kind of antenna assembly of full channel tv signal from all directions that receives, belong to technical field of radio, its composition comprises the active dipole L1 and the L2 of two VHF～uhf band compatibility, banded coupler, the cross plastic casing, vertical rod, 75 Ω coaxial cable and plugs, it is characterized in that: the active dipole (L1) of two VHF～uhf band compatibilities and two arms (L2), by left-right symmetric, folded dipole conductor (1) that the mid point of parallel interval certain distance disconnects and basic half-wave dipole conductor (2) constitute, feed end Orthogonal Composite in horizontal plane of folded dipole conductor (1) and basic half-wave dipole conductor (2) is fixed in the cross plastic casing (4).

2, the antenna assembly of full channel tv signal from all directions that receives according to claim 1 is characterized in that: the upper end that plastic casing (4) is fixed on vertical rod (5).

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