CN1110011A - Antenna assembly - Google Patents

Abstract

A mast-type antenna assembly for earth mobile stations which communicate via a geostationary satellite. The antenna assembly incorporates an evelation regulating device mounted antenna radiate lobe, which permits selective adjustment of the elevation angle of the antenna's radiation lobe for optimum gain from any geographic location. According to the invention, the assembly comprises a bifilar helix arranged within a radome whose end co-operates with screw tracks in a tubular base member such that by twisting the radome the helix is deformed and the pitch of the helix is changed, thereby changing the elevation angle of the radiation lobe radiating from the antenna.

Description

Antenna assembly

The present invention relates to a kind of antenna that adopts synchronous satellite as the mobile communication system of the link between a plurality of mobile earth stations, particularly a kind of electromagnetic antenna pattern is orientated selectively to obtain the antenna assembly of optimum gain.

In above-mentioned the sort of communication system, the antenna of each ground mobile radio station requires to adopt the circular polarization omnidirectional flapole antenna of high-gain, so that can work under all azimuths.Owing to require high-gain, thereby require the elevation direction figure of antenna to have the directivity of height.Therefore synchronous satellite can appear at the sky, horizon of the ground mobile radio station that is distributed in diverse geographic location, and for the antenna that makes the ground mobile radio station reaches maximum gain, the primary radiation lobe of earth station antenna should be adjusted on the accurate elevation angle facing to synchronous satellite.In general, the synchronous satellite elevation angle that the Australian Satellite communication system adopts at present is east longitude 160 degree, be 50 degree at the suitable elevation angle in for example Sydney when the antenna of relevant ground station will obtain best gain, and in Perth, the elevation angle that antenna is suitable is 30 degree.

Some known antenna assembly adopts the elevation angle of array phasing method with the method control antenna radiation lobe of electronics, but this method was both complicated, spent bigger again.In addition, the satellite communication antena device that some is known, for example quadruple screw forms antenna, and the wave beam of its elevation angle lobe directions figure is wide, and it is low to gain, thereby is out of favour.

The purpose of this invention is to provide a kind of simple, gain elevation angle higher, its radiation lobe and regulate simple antenna assembly.

The antenna module that is used for receiving and dispatching the setted wavelength radiofrequency signal provided by the invention has a metal feedback pipe fitting, is covered with the conductor with the pipe fitting coaxial line in this feedback pipe fitting, a termination radio-frequency signal source of conductor; Be surrounded with the lead helix tube of two predetermined lengths, diameter and pitch around the feedback pipe fitting with the form coaxial line of two-wire, an end of each helix tube is coupled to the other end of inner wire usually, and the other end of each helix tube is respectively fixed on first annular support member.First annular support member is made by dielectric material, slidably around described feedback pipe fitting configuration.Described antenna module also has the adjusting device of a band scale, in order to move described first annular support member a certain at least on axially selectively, thereby make the described pitch of the helix tube that respectively waves keep predetermined spacing at least, and then change on the elevation location corresponding with selected scale from the elevation angle of described antenna module with the electromagnetic wave omni-directional pattern of described given wavelength radiation.

In order easily the present invention to be put into practice present accompanying drawings one embodiment of the present of invention.In the accompanying drawing:

Fig. 1 shows the bifilar helix shape antenna element of antenna module of the present invention;

Fig. 2 shows the top section of Fig. 1 antenna element;

Fig. 3 shows the base section of Fig. 1 antenna element;

Fig. 4 shows the radome assembly that Fig. 1 antenna element is equipped with in the inside;

Fig. 5 shows the cutaway view of antenna module regulating element details;

Fig. 6 for example understands the diameter of Fig. 1 antenna element and the relation between the pitch;

Fig. 6 a shows the typical directional diagram of Fig. 1 antenna element.

Referring to accompanying drawing.Antenna element has a copper feedback pipe 1, has the inner wire 2 of a coaxial line to be surrounded by dielectric material 3 in the pipe.Feedback pipe 1 is fixedly attached on the base element 4, and radiofrequency signal promptly is fed in the inner wire 3 by base element 4.

Be formed with the helix tube 5 and 6 that two beryllium copper leads are made around the feedback pipe 1, form the bifilar helix pipe.One end of each helix tube 5,6 is fixedly attached on the annular support member 7 of bottom, and strutting piece 7 is made by dielectric material, slidably around 1 configuration of feedback pipe.The other end of each helix tube terminates on electric and is located on the top annular strutting piece 10 that dielectric material makes on the corresponding contact zone 8 and 9.Top support 10 fixedly is attached on the feedback pipe 1 around feedback pipe 1.The distal end of inner wire 2 is connected on the contact zone 9.Contact zone 8 and the 9 cable balancing transducers 11 by predetermined length are coupled together.

Radome assembly shown in the Figure 4 and 5 comprises the tubular member 12 that a dielectric material that can be penetrated by radio frequency is made.Best and the solenoidal equal diameters of two-wire of the internal diameter of tubular member 12.Tubular member 12 coaxial lines are inserted in tubular base slidably to be regulated in the guide 13.The radome assembly also comprises a locking circle 14, with the screw thread (not shown) cooperating of base adjusting guide 13 ends.

Be carved with predetermined scale 15 on the outer surface of tubular member 12, for the usefulness of setting up the desired radiation lobe elevation angle.The inner surface 16 of tubular base adjusting guide 13 is provided with the parallel channel 17 of two preset space lengths, for using with two adjusting guide finger cooperatings respectively, can see among the figure that one of them guide finger 18 stretches out from bottom support 7 surfaces, stretch in the tubular member 12, embed in the corresponding raceway groove 17.

During the assembling antenna, antenna element shown in Figure 1 is put into the radome assembly, base element 4 coaxial lines of antenna module are fixed in the end sections of tubular base adjusting guide 13.Regulate guide finger 18 respectively with threaded passage 17 engage, thereby reverse when tubular member 12 centers on its rotational and impel bottom support 7 to move axially and rotate, thereby change the pitch of each helix tube, keep the diameter of each helix tube constant substantially and equal the internal diameter of tubular member 12 simultaneously, move to avoid helix tube.

Referring to Fig. 6 and Fig. 6 a, show the diameter of bifilar helix shape antenna element and the relation between the pitch with curve among the figure.This relation can be represented by the formula:

$\mathrm{D\; =}\frac{1}{\Pi }\sqrt{\lambda }{\mathrm{(\lambda \; -\; 2\; P\; S\; i\; n\; \phi \; )-<figure-callout\; id="2"\; label="P"\; filenames="941130002\_DRIMG2.png,941130002\_DRIMG3.png"\; state="\{\{state\}\}">P</figure-callout>}}^2\mathrm{<figure-callout\; id="2"\; label="COS"\; filenames="941130002\_DRIMG2.png,941130002\_DRIMG3.png"\; state="\{\{state\}\}">COS</figure-callout>}{}^2\phi$

The diameter of D=helix tube (rice) wherein

Pitch (rice) between each circle of the same helix tube of P=

Wavelength under λ=radiation frequency (rice)

Φ=elevation angle (degree)

As can be seen from the above equation, diameter and the pitch that changes given bifilar helix pipe can be regulated elevation angle Φ fully continuously.The way of controlling in the reality is to keep the diameter of helix tube constant basically in radome.

In actual applications, using the people of the mobile earth station be equipped with antenna assembly of the present invention can reverse tubular member 12 in case of necessity makes it align with the scale of being scheduled to 15 to regulate the elevation angle of radiation lobe.Scale can mark geographical sign, for example the city title.After the radiation lobe elevation angle of antenna regulates, tighten locking ring 14, with tubular member 12 lockings.

Claims (10)

1, a kind of antenna module that is used for receiving and dispatching the setted wavelength radiofrequency signal, described assembly comprises a metal feedback pipe fitting, be covered with conductor in the feedback pipe fitting with the pipe fitting coaxial line, one termination radio-frequency signal source of conductor, be surrounded with the lead helix tube of two predetermined lengths, diameter and pitch around the feedback pipe fitting with the form coaxial line of two-wire, one end of each helix tube is coupled to the end in addition of inner wire usually, the end in addition of each helix tube is respectively fixed on first annular support member, first annular element is made by dielectric material, slidably around described feedback pipe fitting configuration; Wherein said antenna module also comprises the adjusting device of a band scale, in order at least one is axial, to move described first annular support member selectively, thereby make the described pitch of the helix tube that respectively waves keep predetermined spacing at least, and then change on the elevation location corresponding with selected scale from the elevation angle of described antenna module with the electromagnetic wave omni-directional pattern of described given wavelength radiation.

2, antenna module as claimed in claim 1, it is characterized in that, the adjusting device of described band scale also makes described strutting piece partly rotate by predetermined direction around described metal feedback pipe fitting, thereby makes the diameter of each helix tube constant basically except that making described first annular support member moves axially.

3, antenna module as claimed in claim 3, it is characterized in that, the adjusting device of described band scale comprises tubular shell spare and tubular base element that a dielectric material that can be penetrated by radio frequency is made, one end of described tubular shell spare is inserted in the described tubular base element slidably, described two helix tubes, described tubular shell spare and described tubular base element coaxial line, described two helix tubes are contained in the described tubular shell spare, and described first annular support member is attached on the described tubular shell spare, the inner surface of wherein said tubular base element has two parallel threaded passage and outwardly directed two the pin member cooperatings of part that are seated in from described tubular shell spare the described tubular base element, make described first annular support member partly rotate and do axial motion when thereby part is rotated described tubular shell spare selectively, and then make the pitch of described helix tube change preset distance, and the diameter of described helix tube remains unchanged basically.

4, as the described antenna module of above arbitrary claim, comprise second annular support member that is fixed on the described metal feedback tube end part, this second annular support member comprises a contact device, a described end of each helix tube is connected to the described end in addition of described inner wire.

5, antenna module as claimed in claim 4, wherein said contact device comprises two contact zones, each contact zone is connected with a described end of helix tube respectively, a described contact zone also is connected with the end in addition of described inner wire, and described contact zone all uses the balance conversion cable device of a predetermined length to couple together.

6, as the described antenna module of 3 to 5 arbitrary claims, comprise the device that is carved with scale on the wherein said tubular shell spare.

7, antenna module as claimed in claim 6, the device of wherein said band scale comprises the mark of representing the geographical position.

8, as the described antenna module of 3 to 7 arbitrary claims, comprise a locking device, for described tubular shell spare is locked onto on the described tubular base element liftedly.

9, as the described antenna module of above arbitrary claim, wherein said lead helix tube is made by the beryllium copper lead.

10, a kind of antenna assembly as Figure of description 1 to 6a explanation.

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