CN106785472A - A kind of individual layer folding line circular polarisation selector - Google Patents

Abstract

The present invention discloses a kind of individual layer folding line circular polarisation selector, and the circular polarisation selector includes：Medium substrate；Circular polarisation selects layer, is repeated to connect and compose by the multiple minimum units on the medium substrate；Described each minimum unit includes first input end, the second input, the first output end and the second output end；Metal wire is bent between the first input end and the first output end by spill to connect, the convex being centrosymmetric with the center is formed centered on the right endpoint of concave bottom and bends metal wire, the left end point of the convex bending metal wire is the second input, right endpoint is the second output end, the present invention realizes the transmission of circularly polarised wave using the selection surface of single layer structure, processing and assembly difficulty are reduced, it is achievable isostructural with radome conformal, with stronger practical value.

Description

A kind of individual layer folding line circular polarisation selector

Technical field

The present invention relates to circularly polarised wave selection field.More particularly, to a kind of individual layer folding line circular polarisation selector.

Background technology

Circularly polarised wave can be decomposed into the equal line polarization wave of amplitude all mutually orthogonal in two spaces and on the time, appoint One elliptically polarised wave of meaning can also be decomposed into two oppositely oriented circularly polarised waves, i.e., left-handed and right-handed circular polarization ripple.Entelechy Changing ripple has rotation direction orthogonality, i.e. left-hand circular polarization antenna and right-handed circular polarization antenna compatible, and left-hand circular polarization antenna is only Left-hand circular polarization ripple can be received, when some circularly polarised wave incides the target surfaces such as plane and sphere, its electromagnetism for reflecting Ripple rotation direction can be inverted.Using its rotation direction orthogonality and rotation direction reverse speed characterisstic, circularly polarised wave can suppress misty rain to be disturbed and many Footpath is disturbed, therefore important application is obtained in satellite communication and global positioning system.Additionally, in polarimetric synthetic aperture radar In, under different transmitting-receiving polarization combinations (such as vertical-horizontal polarization combination or left-handed-right-handed circular polarization combination), dielectric constant, The target properties such as physical characteristic, geometry have differential reflection.Thus polarization measurement can greatly improve imaging radar To the acquisition capability of the various information of target.

Producing the antenna of circularly polarised wave has a lot, and for example equiangular spiral antenna, Archimedian spiral antenna, orthogonal feed shake Sub-antenna, circular polarization microstrip antenna etc..Except antenna directly produces circularly polarised wave, can also be loaded on the basis of linear polarized antenna Circular polarizer or circular polarisation selection surface (Circular Polarization Selective Surface, CPSS).CPSS has There is Polarization selection function, line polarization wave is realized decomposing on CPSS surfaces, and the unwanted polarization point of reflection is acted on by Polarization selection Amount, and allow required circular polarisation component by CPSS, realize the generation of circular polarisation in exit surface.Common circular polarizer There are 4~7 Rotating fields as folding line circular polarizer, need to be filled using advanced low-k materials between each layer, its Thickness is higher, is not suitable for strict to volumetric constraint or needs conformal application scenarios.

Accordingly, it is desirable to provide a kind of individual layer folding line circular polarisation selector, to realize using the selection surface of single layer structure The transmission of circularly polarised wave is carried out, and is applicable conformal with the isometric exclusive structure of radome.

The content of the invention

The invention solves the problems that a technical problem be to provide a kind of individual layer folding line circular polarisation selector, use individual layer knot The transmission of circularly polarised wave is realized on the selection surface of structure, reduces processing and assembly difficulty, is capable of achieving isostructural with radome common Shape, with stronger practical value.

In order to solve the above technical problems, the present invention uses following technical proposals：

A kind of individual layer folding line circular polarisation selector, it is characterised in that the circular polarisation selector includes：

Medium substrate；

Circular polarisation selects layer, is repeated to connect and compose by the multiple minimum units on the medium substrate；

Described each minimum unit includes first input end, the second input, the first output end and the second output end；

Metal wire is bent between the first input end and the first output end by spill to connect, with the right-hand member of concave bottom The convex being centrosymmetric with the center is formed centered on point and bends metal wire, the left end point of the convex bending metal wire is Second input, right endpoint is the second output end.

Preferably, the circular polarisation selection layer is single layer structure.

Preferably, the condition of the circular polarisation selection layer transmission criteria circular polarisation is

δ=∠ E_x ^out-∠E_y ^out=n pi/2s n=1,3,5...

Wherein, E_x ^outIt is the horizontal component of outgoing electric field, E_y ^outIt is the vertical component of outgoing electric field.

Beneficial effects of the present invention are as follows：

The invention discloses a kind of individual layer folding line circular polarisation selector, entelechy is realized using the selection surface of single layer structure Change the transmission of ripple, reduce processing and assembly difficulty, it is achievable conformal with the isometric exclusive structure of radome, have Stronger practical value.

Brief description of the drawings

Specific embodiment of the invention is described in further detail below in conjunction with the accompanying drawings.

Fig. 1 shows a kind of schematic diagram of individual layer folding line circular polarisation selector of the invention.

Fig. 2 shows a kind of schematic diagram of individual layer folding line circular polarisation selector minimum unit of the invention.

Fig. 3 shows the electric current point of circular polarisation selection layer in a kind of individual layer folding line circular polarisation selector embodiment of the invention Cloth.

Fig. 4 shows the circular polarisation test result in a kind of individual layer folding line circular polarisation selector embodiment of the invention.

Specific embodiment

In order to illustrate more clearly of the present invention, the present invention is done further with reference to preferred embodiments and drawings It is bright.Similar part is indicated with identical reference in accompanying drawing.It will be appreciated by those skilled in the art that institute is specific below The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.

As shown in figure 1, the invention discloses a kind of individual layer folding line circular polarisation selector, the circular polarisation selector bag Include：Medium substrate and circular polarisation selection layer.Wherein, the circular polarisation selects layer by the multiple minimum units on the medium substrate Repetition is connected and composed.The circular polarisation selection layer is preferably single layer structure.

The circular polarisation selection layer can be made up of the metal periodically bending loop wire being printed on medium substrate.Wherein, institute Stating each minimum unit includes first input end, the second input, the first output end and the second output end；The first input end And first bend metal wire between output end and connect by spill, formed centered on the right endpoint of concave bottom and the center The convex bending metal wire being centrosymmetric, the left end point of convex bending metal wire is the second input, and right endpoint is the Two output ends.As shown in Fig. 2 gray area is a minimum unit, the first input end of the n-th minimum unitWith Second inputWith the N-1 the first output end of minimum unitWith the second output endConnect respectively, institute State the first output end of n-th minimum unitWith the second output endWith the N+1 first input end of minimum unitWith the second inputConnect respectively, N is natural number.

Plane of incidence line polarization wave electric field E can both horizontally and vertically be decomposed into E_xAnd E_yTwo components, by institute Stating the electric field of circular polarisation selection layer outgoing can both horizontally and vertically be decomposed into the horizontal component E of outgoing electric field_x ^outWith The vertical component E of outgoing electric field_y ^out.The circular polarisation Production conditions of circular polarisation selection layer transmission are

δ=∠ E_x ^out-∠E_y ^out=n pi/2s n=1,3,5...

Wherein, E_x ^outIt is the horizontal component of outgoing electric field, E_y ^outIt is the vertical component of outgoing electric field.

As shown in figure 3, selecting the CURRENT DISTRIBUTION of layer for the circular polarisation under TM under Floquent patterns and the excitation of TE single modes.When During TM mode excitations, mainly along two propagateds, for minimum unit each described, the first paths are along-x to surface current Direction of principal axis is propagated by bending metal wire from the first output end to first input end, and the second paths are edge-x-axis direction from second Output end is propagated by bending metal wire to the second input, forms two bending paths side by side staggeredly, and two paths exist Center crosses.When TE mode excitations, the surface current direction of propagation is parallel with-y-axis direction, wherein, the first paths be along- First input end of the y-axis direction from n-th minimum unitIt is minimum to n-th by the N-1 central transmission of minimum unit Second input of unitSecond paths are first input end of the edge-y-axis direction from n-th minimum unitBy The central transmission of n-th minimum unit to n-th minimum unit the second inputTwo paths are in n-th minimum unit First input endWith the second inputPlace crosses.It can be seen that circular polarisation selects layer to level, vertical polarization side To line polarization wave there are different responses, constantly allocating the key parameter of the minimum unit structure by experiment makes by circle The electric field of polarization selector reaches or close to circular polarisation Production conditions, you can form entelechy in the exit surface of circular polarisation selection layer Change ripple.The key parameter of the minimum unit structure is the width W of each minimum unit, and height L, first input end is defeated with second Enter the vertical range d of the/the first output end of end and the second output end, the line width of metal folding line is s and concave metal folding line Two horizontal ends length W_sAnd W_L。

As shown in figure 4, in the present embodiment, being operated in the circular polarisation selection of 18GHz~29GHz (relative bandwidth is 46.8%) Layer, by experiment simulation, obtains key parameter value and is respectively, W=2mm, W_s=0.5mm, W_L=1mm, d=2.3mm, L= 3.5mm, s=0.1mm, AR≤3dB frequency bands of measurement at least cover 18GHz~29GHz (relative bandwidth is 46.8%).Measurement knot Fruit shows, in 18GHz~29GHz frequency in-band insertion loss between 2.5dB~3dB.

In sum, the present invention constitutes circular polarisation using the circular polarisation selection layer comprising multiple minimum units with medium substrate Selector, realizes transmiting to form circular polarisation electric field by incident line polarization wave electric field, and by checking, the present invention justifies only with individual layer Polarization selection layer is to be capable of achieving to realize the transmission of circularly polarised wave, reduces processing and the assembly difficulty of circular polarisation selector, is applicable It is isostructural with radome conformal in volumetric spaces requirement equipment higher, can also realize, with stronger practical value.

Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not right The restriction of embodiments of the present invention, for those of ordinary skill in the field, may be used also on the basis of the above description To make other changes in different forms, all of implementation method cannot be exhaustive here, it is every to belong to this hair Obvious change that bright technical scheme is extended out changes row still in protection scope of the present invention.

Claims (3)

1. a kind of individual layer folding line circular polarisation selector, it is characterised in that the circular polarisation selector includes：

Medium substrate；

Circular polarisation selects layer, is repeated to connect and compose by the multiple minimum units on the medium substrate；

Described each minimum unit includes first input end, the second input, the first output end and the second output end；

Metal wire is bent between the first input end and the first output end by spill to connect, the right endpoint with concave bottom is It is centrally formed the convex being centrosymmetric with the center and bends metal wire, the left end point of the convex bending metal wire is second Input, right endpoint is the second output end.

2. circular polarisation selector according to claim 1, it is characterised in that the circular polarisation selection layer is single layer structure.

3. circular polarisation selector according to claim 1, it is characterised in that the circular polarisation selects layer transmission criteria entelechy The condition of change is

$\mathrm{\β}=\frac{\left|{E_x}^{out}\right|}{\left|{E_y}^{out}\right|}=1$

δ=∠ E_x ^out-∠E_y ^out=n pi/2s n=1,3,5...

Wherein, E_x ^outIt is the horizontal component of outgoing electric field, E_y ^outIt is the vertical component of outgoing electric field.