CN102208716A - Wide-angle irradiation feed source device with parasitic matched media and microwave antenna - Google Patents

Abstract

The invention relates to a wide-angle irradiation feed source device with parasitic matched media and a microwave antenna. The wide-angle irradiation feed source device with the parasitic matched media comprises components such as guided wave media, the parasitic matched media, metal reflecting surfaces, reflective matching steps and the like. The parasitic matched media are arranged on the lateral surfaces of the guided wave media. The metal reflecting surfaces are formed on the upper surfaces of the guided wave media. The reflective matching steps are positioned at the bottom ends of the metal reflecting surfaces. Primary reflecting regions are positioned between the guided wave media and the parasitic matched media. Secondary reflecting regions are positioned outside the parasitic matched media, and are parallel to the primary reflecting regions. One end of each circular waveguide is inserted between the corresponding guided wave medium and the corresponding parasitic matched medium. The microwave antenna comprises a paraboloid and the wide-angle irradiation feed source device with the parasitic matched media. One end of the wide-angle irradiation feed source device with the parasitic matched media is fixed at the top end of the paraboloid. The feed source device provided by the invention is in fit with the short-focus paraboloid to realize the high-performance and low-profile microwave antenna, and the manufacturing cost is effectively reduced.

Description

A kind of wide-angle irradiation feed source device and microwave antenna with parasitic coupling medium

[technical field]

The present invention relates to field of antenna, particularly a kind of wide-angle irradiation feed source device and microwave antenna with parasitic coupling medium.

[background technology]

Continuous development along with mechanics of communication, antenna is more and more wider in the application of communication field, and the kind of antenna is also more and more, such as being useful on the antenna for base station that honeycomb covers, be useful on the terminal antenna of various hand-held and mobile devices, also be useful on the earth station antenna of synchronous satellite communication.Microwave antenna also is a kind of typical application form of antenna, and along with the microwave communication transmission system constantly is used widely in every field such as national economy such as communication, electric power, traffic and national defense construction, microwave antenna has also been obtained significant progress.

But, constantly intensive along with communication network, website is more and more intensive, and the channeling degree also comes high more.Every performance requirement to antenna is also more and more stricter, and particularly to the requirement of antenna radiation pattern envelope, this index has directly reflected the antijamming capability of antenna.And more from now on user will select ETSI-C3 (a kind of European communication standard) antenna.In addition, along with increasingly competitive, each tame manufacturer is all in the method for seeking to reduce the antenna manufacturing cost, and except appropriate design and means such as strengthen management, having only looks for another way technically could solve contradiction between performance and the cost.

The most forward-feed type parabolic antennas that adopt of traditional microwave antenna, as shown in Figure 1, it is parabola between 60 °～80 ° that the microwave antenna of this version has determined it must adopt the irradiation half angle, be commonly called as shallow parabola, but in order effectively to reduce antenna sidelobe, must increase the metal surrounding edge that anti-leak-stopping is penetrated at this antenna periphery, and be used to absorb the microwave absorbing material of stray radiation in a large number in laid inside, its feed source device also must be guided to the antenna rear portion with connector by copper or aluminum waveguide, these designs have all significantly increased the consumption of microwave antenna to copper material and aluminium, and processing technology complexity, take time and effort, make that the manufacturing cost of microwave antenna is high.

[summary of the invention]

Microwave antenna the invention provides a kind of wide-angle irradiation feed source device and microwave antenna with parasitic coupling medium to the technical problem that consumption is big, manufacturing cost is high of copper material and aluminium in the prior art in order to solve.

The present invention solves the technical scheme that the prior art problem adopted: a kind of wide-angle irradiation feed source device with parasitic coupling medium is provided, described wide-angle irradiation feed source device with parasitic coupling medium comprises the guided wave medium, parasitic coupling medium, metallic reflection face, reflection coupling step, the unirefringence district, the birefringence district, circular waveguide and change mould matching section, parasitic coupling medium is on the side surface of guided wave medium, metallic reflection face is on the upper surface of guided wave medium, reflection coupling step is positioned at the bottom of metallic reflection face, the unirefringence district is positioned between guided wave medium and the parasitic coupling medium, the birefringence district is positioned at the outside of parasitic coupling medium and parallel with the unirefringence district, one end of circular waveguide is inserted between guided wave medium and the parasitic coupling medium, becomes the mould matching section and is positioned on the central axis of guided wave medium.

The optimal technical scheme that wide-angle with parasitic coupling medium according to the present invention shines feed source device: described wide-angle irradiation feed source device with parasitic coupling medium further comprises choke groove, and described choke groove is fixed on the top of metallic reflection face and is positioned at the top that step is mated in reflection.

According to an optimal technical scheme with wide-angle irradiation feed source device of parasitic coupling medium according to the present invention: described parasitic coupling medium is bonded on the side surface of guided wave medium by adhesive or sedimentation is attached on the side surface of guided wave medium.

According to an optimal technical scheme with wide-angle irradiation feed source device of parasitic coupling medium according to the present invention: described metallic reflection face is electroplated on the upper surface of guided wave medium or is bonded in by adhesive on the upper surface of guided wave medium by the metal ion sputtering method.

The optimal technical scheme that wide-angle with parasitic coupling medium according to the present invention shines feed source device: the dielectric constant of described parasitic coupling medium is less than the dielectric constant of guided wave medium.

The optimal technical scheme that wide-angle with parasitic coupling medium according to the present invention shines feed source device: the cross sectional shape of described metallic reflection face is a V-arrangement.

The optimal technical scheme that wide-angle with parasitic coupling medium according to the present invention shines feed source device: described circular waveguide is the aluminum circular waveguide.

The optimal technical scheme that wide-angle with parasitic coupling medium according to the present invention shines feed source device: the thickness of described parasitic coupling medium is the quarter-wave of operating frequency in parasitism coupling medium of microwave antenna.

The present invention also provides a kind of microwave antenna, the wide-angle irradiation feed source device that described microwave antenna comprises parabola and has parasitic coupling medium, a described end with wide-angle irradiation feed source device of parasitic coupling medium is fixed on described paraboloidal top, and described wide-angle irradiation feed source device with parasitic coupling medium adopts above-mentioned wide-angle irradiation feed source device with parasitic coupling medium.

An optimal technical scheme according to microwave antenna of the present invention: described wide-angle irradiation feed source device with parasitic coupling medium shines described parabola with illumination angle.

An optimal technical scheme according to microwave antenna of the present invention: described paraboloidal irradiation half angle is 100 °～120 °.

Beneficial effect of the present invention is: the present invention has realized the feed illumination angle of broad and good standing wave performance.Adopt feed source device of the present invention can cooperate short focal length parabola to realize the microwave antenna of high-performance and low profile, and effectively reduce manufacturing cost, solved the contradiction between performance and the manufacturing cost technically.

[description of drawings]

Fig. 1 is the structural representation of existing forward-feed type parabolic antenna.

The internal structure schematic diagram of the wide-angle irradiation feed source device of Fig. 2 parasitic coupling medium for the present invention has.

The external structure schematic diagram of the wide-angle irradiation feed source device of Fig. 3 parasitic coupling medium for the present invention has.

Fig. 4 is the structural representation of microwave antenna of the present invention.

The oscillogram of the microwave antenna standing wave when Fig. 5 A mates medium for not adding parasitism.

The oscillogram of the microwave antenna standing wave when Fig. 5 B mates medium for increasing parasitism.

The feed directional diagram of the microwave antenna when Fig. 6 A mates medium for not adding parasitism.

The feed directional diagram of the microwave antenna when Fig. 6 B mates medium for increasing parasitism.

The directional diagram of the microwave antenna when Fig. 7 mates medium for increasing parasitism.

[embodiment]

Below in conjunction with accompanying drawing technical solution of the present invention is elaborated.

The wide-angle that utilization of the present invention has parasitic coupling medium shines the microwave antenna that feed source device can be realized high-performance and low profile, the application band of microwave antenna can be contained most frequency ranges (5GHz～40GHz) of microwave current relay, the design that realizes lacking surrounding edge even do not have surrounding edge, thereby reduce raw-material use greatly, realize best balance between the Cost And Performance, this in addition microwave antenna also has higher gain and lower appearance profile.

As shown in Figures 2 and 3, the wide-angle irradiationfeed source device 10 that the present invention has parasitic coupling medium comprises guided wave medium 1,parasitic coupling medium 2, metallic reflection face 3,reflection coupling step 4, unirefringence district 5, birefringencedistrict 6,circular waveguide 7, become mould matchingsection 8 and choke groove 9,parasitic coupling medium 2 is on the side surface of guided wave medium 1, metallic reflection face 3 is on the upper surface of guided wave medium 1, the cross sectional shape of metallic reflection face 3 is a V-arrangement,reflection coupling step 4 is positioned at the bottom of metallic reflection face 3, unirefringence district 5 is between guided wave medium 1 andparasitic coupling medium 2, birefringencedistrict 6 is positioned at the outside ofparasitic coupling medium 2 and parallel with unirefringence district 5, whereincircular waveguide 7 can be the aluminum circular waveguide, one end ofcircular waveguide 7 is inserted between guided wave medium 1 and theparasitic coupling medium 2, become mould matchingsection 8 and be positioned on the central axis of guided wave medium 1, choke groove 9 is fixed on the top of metallic reflection face 3 and is positioned at the top of reflection coupling step 4.Wherein,parasitic coupling medium 2 can be bonded on the side surface of guided wave medium 1 or sedimentation is attached on the side surface of guided wave medium 1 by adhesive.Metallic reflection face 3 can be electroplated on the upper surface of guided wave medium 1 or is bonded in by adhesive on the upper surface of guided wave medium 1 by the metal ion sputtering method.Reflection coupling step 4 is used to cooperate change mould matchingsection 8 to improve the standing wave of feed source device jointly.The effect of choke groove 9 be prevent as far as possible energy diffraction to feed source device dorsad, and concentration of energy shone on the parabola.

According to Theory of Electromagnetic Field and microwave principle, the main pattern of transmission is the TE11 pattern in thecircular waveguide 7, but voltinism such as the electric field of this mode radiation and magnetic field can be relatively poor, in general direction of an electric field figure can be narrower than magnetic direction figure, particularly in the wide-angle zone, this difference can cause paraboloidal radiation inhomogeneous, also causes parabolic mouthful face utilance to descend, and directly influences the efficient of microwave antenna.The present invention has used change mould matchingsection 8, and a part of TE11 mode switch in thecircular waveguide 7 is become the TM11 pattern, then TE11 pattern and TM11 pattern is formed a kind of mixed radiation pattern, and the ratio of two kinds of patterns is called the mould ratio.Utilize the length and the stepped change that become mould matchingsection 8 to realize certain mould ratio and phase place, realize that at the irradiation area of broad Energy distribution is even thereby make from electric field and magnetic field thatcircular waveguide 7 oral areas radiate.In addition, become mould matchingsection 8 and also played the effect of impedance matching, thereby effectively reduce the reflection of energy, optimized the standing-wave ratio of feed source device.The determining ofcircular waveguide 7 internal diameters is to determine that according to the higher mode excitation radius by radius and high frequency of low frequency the formula (1) of the general span ofcircular waveguide 7 internal diameter R is as follows:

Wherein, fmin is for using the low-limit frequency of frequency range, and fmax is for using the highest frequency of frequency range.

When energy (electromagnetic wave) enters guided wave medium 1, energy will be propagated along it.Theoretical according to refraction, refraction effect can take place when entering another kind of medium by a kind of medium in electromagnetic wave.Under certain conditions, when the medium by high-k enters the medium of low-k total reflection phenomenon can take place, the present invention has utilized this principle just, rationally chooses the dielectric constant (ε of guided wave medium 1_R1) and second angle B (angle betweenparasitic coupling medium 2 and the change mould matching section 8), make energy before arriving metallic reflection face 3, from guided wave medium 1, reveal away as few as possible, the energy of a transmission part is directly shone to metallic reflection face 3 incircular waveguide 7, and another part is then by projecting on the metallic reflection face 3 after 5 total reflections of unirefringence district again.The energy of the metallic reflection face of projecting 3 is through diffusing to after reflecting in theparasitic coupling medium 2, should illustrate, the bus in the bus of metallic reflection face 3 and unirefringence district 5 all should be complicated transcendental equation curve in theory, these two curves should be determined according to law of conservation of energy, reflection equation, refraction equation, required parameters such as antenna aperture illumination (function), but consider the difficulty of processing in later stage, can pass through the dielectric constant (ε of choose reasonable first angle A (angle between metallic reflection face 3 and the change mould matching section 8), second angle B and guided wave medium 1_R1) approximate method reaches purpose of design, emulation and experimental result show that this approximate method is very effective, bus is that scheme and the bus of curve is the scheme of straight line, unanimity almost on radiation efficiency and directional diagram parameter.

Parasitic coupling medium 2 roles are very crucial in the present invention, it both can make energy reflect once more, strengthen effective illumination angle, and can between guided wave medium 1 and air, play transitional function, reduce reflection, optimization system standing wave, Fig. 5 A and Fig. 5 B have compared the standing wave of microwave antenna (frequency is 15GHz) when having or not parasitism coupling medium, and Fig. 6 A and Fig. 6 B have compared the feed directional diagram of microwave antenna (frequency is 15GHz) when having or not parasitism coupling medium.Fig. 5 A represents not have the standing wave of parasitic coupling medium, and Fig. 5 B represents to have the standing wave of parasitic coupling medium; Fig. 6 A represents not have the feed directional diagram of parasitic coupling medium, and Fig. 6 B represents to have the feed directional diagram of parasitic coupling medium.For achieving the above object the dielectric constant (ε of parasitic coupling medium 2_R2) choose very crucially, the dielectric constant ofparasitic coupling medium 2 is less than the dielectric constant of guided wave medium 1, general choosing method is:

The thickness size ofparasitic coupling medium 2 is the quarter-wave of operating frequency inparasitism coupling medium 2 of microwave antenna, for example: in frequency is in the microwave antenna of 15GHz, when the dielectric constant of choosingparasitic coupling medium 2 was 1.6, the thickness ofparasitic coupling medium 2 was about 4.5mm.

To sum up, the wide-angle irradiation feed source device that the present invention has a parasitic coupling medium has been realized being diffused on the short focal length parabola of energy even that circular waveguide is radiated by reflection and refraction are theoretical, has realized comparatively ideal actinal surface field distribution, has reduced feed and has blocked.When improving the microwave antenna performance, greatly reduce the profile of microwave antenna, saved manufacturing cost.

As shown in Figure 4, developing a kind of bore according to above-mentioned principle is 0.6 meter, frequency is the microwave antenna of 15GHz, this microwave antenna comprises the wide-angle irradiationfeed source device 10 with parasitic coupling medium,parabola 11 andmetal surrounding edge 12, parabolic 11 irradiation half angle is 100 °～120 °, the focal length of microwave antenna is 100mm, end with wide-angle irradiationfeed source device 10 of parasitic coupling medium is fixed on parabolic 11 top, wide-angle irradiationfeed source device 10 with parasitic coupling medium is with illumination angle irradiation parabolic 11,metal surrounding edge 12 is located at parabolic 11 edge, the height ofmetal surrounding edge 12 has only 50mm, thismetal surrounding edge 12 can further improve the radiance of microwave antenna and improve the front and back ratio, but thismetal surrounding edge 12 is short more a lot of than the metal surrounding edge of the forward-feed type parabolic antenna of effect same.Test by reality, the standing wave of microwave antenna (shown in Fig. 5 B), gain, cross polarization resolution and radiance satisfy system requirements, particularly its directional diagram (as shown in Figure 7) and front and back ratio reach the requirement of European pressure standard (ETSI-R2-C3) fully.

Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these execution modes.Therefore, protection scope of the present invention is limited by appended claims.

Claims (10)

1. the wide-angle with parasitic coupling medium shines feed source device, it is characterized in that, described wide-angle irradiation feed source device (10) with parasitic coupling medium comprises guided wave medium (1), parasitic coupling medium (2), metallic reflection face (3), reflection coupling step (4), unirefringence district (5), birefringence district (6), circular waveguide (7) and change mould matching section (8), parasitic coupling medium (2) is on the side surface of guided wave medium (1), metallic reflection face (3) is on the upper surface of guided wave medium (1), reflection coupling step (4) is positioned at the bottom of metallic reflection face (3), unirefringence district (5) is positioned between guided wave medium (1) and the parasitic coupling medium (2), birefringence district (6) is positioned at the outside of parasitic coupling medium (2) and parallel with unirefringence district (5), one end of circular waveguide (7) is inserted between guided wave medium (1) and the parasitic coupling medium (2), becomes mould matching section (8) and is positioned on the central axis of guided wave medium (1).

2. the wide-angle irradiation feed source device with parasitic coupling medium according to claim 1, it is characterized in that, described wide-angle irradiation feed source device (10) with parasitic coupling medium further comprises choke groove (9), and described choke groove (9) is fixed on the top of metallic reflection face (3) and is positioned at the top of reflection coupling step (4).

3. the wide-angle irradiation feed source device with parasitic coupling medium according to claim 1, it is characterized in that described parasitic coupling medium (2) is bonded on the side surface of guided wave medium (1) by adhesive or sedimentation is attached on the side surface of guided wave medium (1).

4. the wide-angle irradiation feed source device with parasitic coupling medium according to claim 1, it is characterized in that described metallic reflection face (3) is electroplated on the upper surface of guided wave medium (1) or is bonded in by adhesive on the upper surface of guided wave medium (1) by the metal ion sputtering method.

5. the wide-angle irradiation feed source device with parasitic coupling medium according to claim 1 is characterized in that the dielectric constant of described parasitic coupling medium (2) is less than the dielectric constant of guided wave medium (1).

6. the wide-angle irradiation feed source device with parasitic coupling medium as claimed in claim 1 is characterized in that the cross sectional shape of described metallic reflection face (3) is a V-arrangement.

7. the wide-angle irradiation feed source device with parasitic coupling medium according to claim 1 is characterized in that described circular waveguide (7) is the aluminum circular waveguide.

8. the wide-angle irradiation feed source device with parasitic coupling medium according to claim 1 is characterized in that, the thickness of described parasitic coupling medium (2) is that the operating frequency of microwave antenna is mated quarter-wave in the medium (2) at parasitism.

9. microwave antenna, it is characterized in that, the wide-angle irradiation feed source device (10) that described microwave antenna comprises parabola (11) and has parasitic coupling medium, a described end with wide-angle irradiation feed source device (10) of parasitic coupling medium is fixed on the top of described parabola (11), and described wide-angle irradiation feed source device (10) with parasitic coupling medium adopts each described wide-angle irradiation feed source device with parasitic coupling medium of claim 1-8.

10. microwave antenna according to claim 9 is characterized in that, described wide-angle irradiation feed source device (10) with parasitic coupling medium shines described parabola (11) with illumination angle.

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