CN1075575A - The decameter wave dipole reaches by its rotable antenna that constitutes - Google Patents

Abstract

A kind of dipole that is used for the decameter wave antenna dipole array.This is a kind of full-wave doublet of rigidity.It comprises the dipole body, and the dipole body is made up of two half dipoles, and they are placed in extension each other; Also have an end stake, it guarantees that the dipole body has suitable input impedance and need not insulator and the metal structure of dipole body and antenna can be linked together.This kind dipole can be applied to decameter-wave antenna, especially rotable antenna.

Description

The decameter wave dipole reaches by its rotable antenna that constitutes

The present invention relates to a kind of antenna that is used for the dipole of decameter wave and uses this dipole formation, present invention is specifically related to the rotable antenna that the decameter wave dipole constitutes.And, in seeking to improve the process of rotable antenna, produced design just about dipole of the present invention.

Decameter wave dipole submatrix or dipole screen antenna are that a kind of height reaches tens of rice, width reaches tens of meters antenna.The height of some antenna, width reach more than hundred meters.In all these antennas, all dipoles on the same battle array are all in the same plane, and this just means that we can not use the formulation of dipole submatrix or dipole screen with making any distinction between.Existing antenna has the orthogonal array of rectangle, and these arrays are made of the dipole on the row and column that is evenly distributed on overlapping, and the antenna dipoles battle array mostly adopts rectangle or square.This battle array is always with a reflector, and it is made up of parallel lead usually, and reflector itself is also taked rectangle or square, and its size is generally all greater than the size of antenna array, and parallels with this dipole submatrix.After the given size of decameter-wave antenna, it will be very difficult and very expensive wanting to make this antenna to have appropriate rigidity.And if can not guarantee this rigidity, serious variation can take place in the matching properties of this kind antenna under wind effect so.This variation means that the radiation characteristic of antenna degenerates so that can not work at all.

For rotable antenna, the windproof problem especially is difficult to solve, and can not quilt be stretched tight between two pillars as some fixed antenna because those constitute the lead grid of reflectors and lead dipole submatrix.Rotable antenna has only a pillar perpendicular to the center of antenna position, and the beam of level is fixed on this root pillar, and all these horizontal beams are all in the same plane, and the insulator of metal arm and cable and each grid of support is housed on these horizontal beams simultaneously.

In order to make this dipole submatrix firmer, once the someone advised replacing all-wave lead dipole with folding ripple rigidity dipole.This half-wave dipole has a zero-potential point, thereby can directly be fixed on the horizontal beam by metal arm.So this dipole submatrix is to be made of the lead grid no longer just, so its distortion in fact also just is limited to pillar-horizontal beam department of assembly.Unfortunately, at original half-wave conductor dipole place, its physical length is 0.75 times of operation wavelength, so must replace it with two end to end half-wave rigidity dipoles.The length that these two rigidity dipoles add together is equivalent to a central task wavelength.Concerning a battle array, this causes its gross area to increase about 20%.

Purpose of the present invention is for providing a kind of decameter wave dipole and by its antenna that constitutes, to improve the rigidity of antenna, reducing the weight and the windage of antenna.

The method that realizes is to replace all-wave lead dipole with the rigidity full-wave doublet, and this rigidity full-wave doublet aims at the decameter wave pattern and designs, and it directly is fixed on the metal structure of antenna without any need for insulator.

According to the present invention, provide a kind of full-wave doublet of decametric range.This rigidity full-wave doublet that can be fixed on the support is made up of a dipole body and an end stake; The dipole body is made up of two half dipoles, they are placed in extension each other, each half dipole has first end freely, its second end is relative with second end of second half dipole, the end stake is made up of two booms parallel to each other and the short-circuiting device between this two boom, first end of each boom joins respectively at second end with each dipole body, their second end then is designed to be fixed on the support, each half dipole shape is as a cage that has elongated, and girth member wherein guarantees the rigidity of this cage.

The present invention also provides a kind of decameter wave rotable antenna of having equipped above-mentioned dipole.

Other characteristic of the present invention further specifies by following description and accompanying drawing.Wherein:

Fig. 1 represents according to a kind of dipole of the present invention.

Fig. 2 and Fig. 3 represent the rotable antenna of the formation according to the present invention.

In different accompanying drawings, corresponding parts illustrate by same mark.

Fig. 1 represents a rigidity full-wave doublet, and the average operation wavelength λ of the design of this dipole is 35.44 meters, and correspondent frequency is about 8.5MHz.This full-wave doublet (E1) has a dipole body (D1) and an end stake (S1).This assembly is fixed on the horizontal beam (P1), and horizontal beam itself is then not shown with the center pole M(of rotable antenna with the one end) link to each other, this point can be described by Fig. 2.

End stake S1 is that short-circuiting device is made with two parallel metal rods by two parallel booms (Sa and Sb) and the short-circuiting device I formation that is connected boom.Identical 0.25 λ that is of the length of two booms, wherein arbor distance is 1.5 meters; Its first end by bolt on horizontal beam P1.Two rods of short-circuiting device I are positioned at apart from boom second end 0.13 λ place, and the latter is the fixing point of dipole body D1.Regulating this distance can be so that the input impedance of dipole body D1 reaches coupling in whole working frequency range is the scope of 6-11MHz, thereby the standing-wave ratio that makes the dipole body is less than 2.

The total length of dipole body D1 is 0.76 λ; It is made of two half dipole Da and Db, and the shape of each half dipole guarantees rigidity as the cage of an elongation by girth member T, and girth member T is divided into T1 and the two-part pipe of T2 and two lining dish A, B by one and forms.Two parts of T1 and T2 are positioned over extension each other.The T1 of first is welded on the corresponding boom Sb, and its diameter is 20 centimetres, and the diameter of second portion T2 is 10 centimetres.Two the lining dish A of girth member T and the diameter of B are 1.2 meters, are positioned near the termination of T1 and T2 pipe.The stake of each dipole cage is 12 leads of 6 millimeters by diameter and constitutes, and the termination of these leads all is fixed on the termination of T1-T2 pipe; These leads are evenly distributed on the edge of the lining dish that they rely on.Will make the dipole body have suitable electric diameter in the present embodiment has enough impedances and bandwidth to guarantee it, and its two half dipole Da and Db stretch out to both sides, and weight is light and windage is lower.

Must be pointed out that above-mentioned dipole is directly grounded by boom Sa and Sb, horizontal beam P1 and antenna support.

The dipole of Fig. 1 can also can come feed by coaxial cable by the two-conductor line feed as full-wave doublet and half-wave dipole, and present embodiment promptly adopts the latter.It need not be provided with the transformer (balun) between the balanced-unbalanced circuit between the coaxial cable output line of transmitter and dipole.Moreover, in this example, the feed coaxial cable of dipole D1 passes boom Sb and its outer conductor directly is fixed on the boom Sb.Certainly, also can utilize boom Sb to serve as coaxial cable conductor, at this moment, inner wire must by means of insulator with guarantee in whole boom by the time do not touch mutually with boom.If the angle of boom can not form enough little mesh with the abundant electric wave obstacle on the operating frequency that is formed in this dipole, then boom must be topped with lead.

Fig. 2 and Fig. 3 show a dual rotary decameter-wave antenna, it highly is 82 meters, width is 64 meters, comprises a support and two antenna bodies: one is the low-frequency antenna that is operated in 6 to 11 megahertz wave bands, and one is the high frequency antenna that works in 11 to 21 megahertzes.

Support comprises a hole formula pedestal, and this pedestal is by brick one-tenth, and Space L wherein is used to place transmitter.A mechanical device has the ring rail C that a driving shaft drives the pedestal top rotatably.The lower end of this ring rail and plumb post M is fixed together, and the horizontal beam P1 to P4 that is on the same vertical plane is housed on the pillar.Hold stake S ' 1 to S ' 8 and s1 to s12 to be fixed on these horizontal beams for 20.As dagger, the rigid rod of (as J) and distance bar (as K) is contained on the corresponding termination of horizontal beam and is positioned on the plane at horizontal beam place.Guy rope (as H) is tiltedly linked horizontal beam on the pillar.Pillar comprises three parts: a circular cross-section column is vertically basic, and a scalariform longitudinal beam is housed on it, and two rods are housed again on this longeron, and their end separately is welded to one another the acute angle that together forms a point upward.

Low-frequency antenna is a HR4/4/0.5 type antenna, and in other words, it has a horizontal dipole screen and reflector, whenever shows four full-wave doublets.The height off the ground of the first row dipole is 0.5 times of the average operation wavelength of this antenna.The dipole screen of this low-frequency antenna is made of 8 dipole D1 to D8 that are fixed in the end stake by as shown in Figure 1 mode.These dipoles all are positioned on the vertical plane that parallels with the horizontal beam vertical plane.Low-frequency antenna comprises a reflector Rb, and it is parallel to the vertical plane that is made of dipole D1 to D8, and relies near on horizontal beam P1 to the P8 surface on dipole D1 to D8 plane.In fact, this reflector Rb is made of the horizontal wire aperture plate.The horizontal wire of reflector Rb is by supporting through the free-ended edge cable of pillar M top and dagger (as J).Spacing between the horizontal wire guarantees that by several vertical cable (not shown)s all horizontal wires of reflector Rb all are fixed on the well-regulated interval location.The reflector Rb of low-frequency antenna does not have picture complete in Fig. 2, in order that can provide the diagrammatic sketch that is positioned at high frequency antenna thereafter.In Fig. 3, this reflector is represented its profile on this figure by a dotted line.

High frequency antenna is the HR4/6/0.75 type, that is to say, it has a horizontal dipole screen and reflector, and every row has two, whenever shows six full-wave doublets in the screen, and the height off the ground of the first row dipole is 0.75 times of the average operation wavelength of this antenna.The screen of this high frequency antenna is made of 12 dipole d1 to d12 that as shown in Figure 1 mode is fixed in the end stake.These dipoles are positioned on the same vertical plane, and this vertical plane parallels with the horizontal beam vertical plane.High frequency antenna comprises a reflector Rh, and it is made of the horizontal wire vertical gate, is positioned at the plane that parallels with reflector Rb, is in the other one side of horizontal beam P1 to P8; The horizontal wire of this reflector Rh is fixed on the framework of being located by horizontal beam P7, P8 by the limit cable, the lower end of this limit cable is fixed on down on horizontal beam P1 and the P2 by two struts, interval between the horizontal wire guarantees that by several vertical cable (not shown)s all horizontal wires are all fixed with well-regulated interval location.Rb is similar with reflector, and reflector Rh does not draw complete in Fig. 2 yet, so that award the view of the high frequency antenna dipole screen that is positioned at thereafter, in Fig. 3, it is shown in dotted line its profile on this figure with one.

Corresponding antenna has as shown in Figures 2 and 3 had, and only it is made of the rigidity half-wave dipole.It highly still is 82 meters, and width is then bigger significantly, no longer is 64 meters of forming with dipole shown in Figure 1 but is increased to 76 meters.Therefore, the windage of above-mentioned antenna obviously reduces, if under same wind-force effect, its structure can realize by lower one-tenth originally.

The present invention is not limited to described example.Therefore, all-wave half dipole cage can be made with the metal ladder-shaper structure.In like manner, also available other method of girth member T constitutes, and especially can constitute with one or more rod on the cage.

It must be noted that also though dipole of the present invention is particularly useful for the decameter wave rotable antenna, it also can be used to the various uses of decametric range, for example the direct single-column fixed antenna fixed thereon of dipole; Or the fixed antenna of the formation of the horizontal beam between multicolumn and the multicolumn, dipole directly is fixed on these pillars or is fixed on the horizontal beam.

Claims (6)

1, a kind of full-wave doublet that is used for decametric range, for body is fixed on rigidity full-wave doublet on the support, this kind dipole comprises dipole body and an end stake, the dipole body is made up of two half dipoles, these two half dipoles are placed in extension each other, each half dipole has first end freely, its second end is relative with second end of second half dipole, end stake is made up of the short-circuiting device between two parallel booms and one two boom, first end of each boom and each dipole body second end join respectively, its second end is designed to be fixed on the support, the shape of each half dipole such as the same cage that has extended, and have girth member to guarantee the rigidity of this cage.

2, according to a kind of full-wave doublet of claim 1, the girth member on it comprises a pipe and two lining dishes, and it is big that want in the cross section of the section ratio pipe of lining dish, and they are separately fixed near two terminations of pipe.

3, according to a kind of full-wave doublet of claim 2, its cage structure comprises one group of parallel wire, and these leads are tightened up between two lining dishes.

4, according to a kind of full-wave doublet of one of aforesaid right requirement, this dipole is by coaxial cable feed.

5, according to a kind of full-wave doublet of claim 4, one of two booms wherein become the outer conductor of coaxial cable on total length.

6, according in above all claims at least one, a kind of decameter wave rotable antenna of equipping described dipole.

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