CN102800960A

CN102800960A - Antenna cover for reducing transmission loss and inserting phase displacement

Info

Publication number: CN102800960A
Application number: CN2012102557415A
Authority: CN
Inventors: 高劲松; 王岩松; 陈新; 徐念喜
Original assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Current assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Priority date: 2012-07-23
Filing date: 2012-07-23
Publication date: 2012-11-28

Abstract

The invention provides an antenna cover for reducing transmission loss and inserting phase displacement, belonging to the technical field of electric properties of a radar antenna cover. With the adoption of the antenna cover, the first-order influence on an antenna system is reduced, and the guidance precision of an aircraft is improved. The antenna cover is additionally provided with a metal conduction screen and a dielectric layer on an ordinary antenna cover technology; the dielectric layer is manufactured on the ordinary antenna cover; and the metal conduction screen is manufactured on the dielectric layer. When the metal conduction screen is loaded on the antenna cover, a directional diagram of a radar antenna can be improved, so that even if the antenna grain consumption and the antenna beam drift can be reduced, the guidance precision of the aircraft can be improved. With the adoption of the antenna cover provided by the invention, not only can the transmission property of the antenna cover with the existing type be optimized, but also the novel antenna cover can be developed, so that no resistance increase and no weight increase can be realized. Furthermore, the antenna cover has the technical characteristics of being thin, light, wide and strong.

Description

A kind of loss and radome that inserts phase shift of reducing

Technical field

The invention belongs to the technical field of radome electrical property, be specifically related to a kind of loss and radome that inserts phase shift of reducing.

Background technology

Radome (Radome) is by covering natural or that artificial dielectric's material is processed, or the electromagnetism window of the special shape that is made up of the dielectric housing of truss support.Radome cover wall cross-sectional configuration can be divided into even individual layer, thickening degree individual layer, A-interlayer, B-interlayer, C-interlayer and sandwich construction etc.Upon request higher carry-on radome generally adopts the half-wavelength wall construction.Radome can be divided into single order influence and second order influence to the influence of any antenna system.Wherein, single order influence depend primarily on transmitance that radome changes with incidence angle with insert phase shift (Insertion phase delay, IPD).They mainly influence, and directional diagram changes in the antenna paraxial region, comprising the decline of antenna gain, the skew of beam position, the change of lobe width and the increase of sidelobe level.For precise guidance type radome, the decline of antenna gain and the skew of beam position will have a strong impact on the tactical qualities of weapon.Therefore, the loss and the IPD that how to reduce radome are the research focuses in the weaponry field.

At present, the technology of the loss of (≤60 °) reduction radome and IPD mainly is to adopt the radome cover wall of power transformation degree in wide angular region.When plane wave incides on the radome cover wall of arbitrary shape, the corresponding different incidence angles degree of cover wall surface zones of different, as shown in Figure 1.The loss that reduces radome when the cover wall that adopts power transformation thickness is during with IPD, and we need be directed against in 20 °, 40 ° and the 60 ° of sweep limitss, optimize different electric thickness.

The shortcoming of this method is: the surface of (1) radome forms a kind of discontinuous structure, and transitional region causes antenna pattern distortion to occur easily; (2) method of power transformation thickness has not only increased radome electrical property optimal design difficulty, and has increased the technology difficulty of preparation radome.

Summary of the invention

In order to solve the problem that exists in the prior art, the invention provides a kind of loss and radome that inserts phase shift of reducing, this radome has reduced the single order influence to antenna system, improves the guidance precision of aircraft.

The technical scheme that technical solution problem of the present invention is adopted is following:

A kind of loss and radome that inserts phase shift of reducing comprises the radome body, on the radome body, is provided with dielectric layer, on dielectric layer, is provided with the metallic conduction screen.

The invention has the beneficial effects as follows: behind radome metal-loaded conducting screen, can improve the directional diagram of radar antenna, promptly reduce the antenna gain loss and reduce the antenna beam skew, thereby improve the guidance precision of aircraft.The present invention has the transmission characteristic of original model radome, can also develop the new antenna cover, does not increase resistance, does not increase weight, and possessed thin, light, wide and strong technical characterictic.

Description of drawings

When Fig. 1 prior art midplane ripple incided on the arbitrary shape radome, the surface of radome was divided into different scanning angle The corresponding area sketch mapes.

A kind of front view that reduces loss and the radome that inserts phase shift of Fig. 2 the present invention.

A kind of vertical view that reduces loss and the radome that inserts phase shift of Fig. 3 the present invention.

Fig. 4 loss of radome of the present invention and common radome in 0 ° of-60 ° of scan angle scope concerns comparison diagram.

Fig. 5 insertion phase shift of radome of the present invention and common radome in 0 ° of-60 ° of scan angle scope concerns comparison diagram.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is explained further details.

A kind of loss and radome that inserts phase shift of reducing; As shown in Figure 2; This radome is the technical increase metallic conduction screen 1 and dielectric layer 2 at common radome, and dielectric layer 2 is produced on the common radome, and metallic conduction screen 1 is produced on the dielectric layer 2.As shown in Figure 3, metallic conduction screen is to constitute by falling " Y " shape slot element, and the metallic conduction screen is gone up unit, even distribution Y groove part crack, and the center angle of unit, adjacent three Y groove part cracks is 60 °, and ring length is W outside the top, unit, Y groove part crack _Out, interior ring length is W _In, the outer shroud top is L to the length at center _Out, interior ring top is L to the length at center _In, establishing dielectric layer 2 effective relative dielectric constants is ε _Reff, operation wavelength is λ ₀Metallic conduction screen satisfies:

the unit cycle, metallic conduction screen 1 had higher and stable Q value during less than half wavelength.But the transmission characteristic of metallic conduction screen 1 is by the decision of infinite a plurality of not Lip rivers cover mold formula, comprises holotype and higher order mode.Wherein, high-rder mode belongs to evanescent mode, and it will influence the transmission of holotype.Therefore, under the situation that does not influence main mould transmission, dielectric layer 2 can be decayed higher order mode, thereby main mould is separated with high-rder mode.When the opposite side at dielectric layer 2 loaded the dielectric of arbitrary structures, in wide scan angle scope, metallic conduction screen 1 all had higher and stable Q value.Utilize this characteristic; When optimizing current version radome or development new antenna cover; After we make up metallic conduction screen 1 and dielectric layer 2 and common radome successively, utilize the higher and stable Q value of metallic conduction screen 1, in wide scan angle scope; As shown in Figure 4, the transmision loss of radome among the present invention is compared obvious decline with common radome.Moreover, utilize the flat effective dielectric constant of support metal conduction, radome of the present invention is lower than the insertion phase shift of generic media radome, and is as shown in Figure 5.

In the present embodiment, it is following with the manufacture method of the radome that inserts phase shift to reduce loss: the rolled copper foil of 35 micron thick that in the preparation of metallic conduction screen, Japanese Feitian company generated and the polyimide film Kpaton layer of 25 micron thick of du pont company generation close.Then, utilize the printed wire plate technique, the shape shown in the metallic conduction screen 1 among corrosion preparation Fig. 2, " Y " shape slit precision is controlled in 10 microns.The thick foam of 2mm that dielectric layer 2 employing Beijing aircraft industry groups 625 are generated, relative dielectric constant is 1.03, loss tangent value is 0.001.When the radome profile is extensible quadratic surface, utilize existing radome preparation technology, according to common radome → foam → metallic conduction screen order, layer closes prepares the new antenna cover that contains the metallic conduction screen.When the radome profile was not deployable quadratic surface, need prepare the metallic conduction screen by burst this moment on the anode membrane of autoclave, closes foam and common radome at layer successively then.

Claims

1. A radome for reducing transmission loss and insertion phase displacement, comprising a radome body, characterized in that a dielectric layer is provided on the radome body, and a metal conductive screen is provided on the dielectric layer.

2. A kind of radome that reduces transmission loss and insertion phase shift as claimed in claim 1, is characterized in that, Y-shaped slot units are evenly distributed on the metal conductive screen, and the center clips of three adjacent Y-shaped slot units The angle is 60°, and the material of the dielectric layer is a low dielectric constant dielectric.

3 . The radome with reduced transmission loss and insertion phase shift as claimed in claim 2 , wherein the slot of the inverted Y-shaped slot unit is within 10 nm. 4 .

4. The radome with reduced transmission loss and insertion phase shift according to claim 1, wherein the material of the dielectric layer is foam or honeycomb material.