CN204947091U - A kind of circularly-polarizedhorn horn antenna based on C-band - Google Patents

Abstract

The utility model discloses a kind of circularly-polarizedhorn horn antenna based on C-band, is made up of waveguide coaxial converter, circular polarizer, antenna aperture and chirality Meta Materials coating.Antenna aperture is the pyramidal horn body of a up/down perforation.Waveguide coaxial converter comprises coaxial line joint and rectangular waveguide.Circular polarizer comprises metal partion (metp) and rectangular waveguide.Chirality Meta Materials coating is positioned at directly over antenna aperture, and and there is certain interval between antenna aperture.This chirality Meta Materials coating comprises the frequency-selective surfaces unit group that medium substrate and at least one group of being printed on medium substrate turn round zigzag mutually.The utility model can, under limited longitudinal length and aperture area prerequisite, make antenna obtain higher gain and better circular polarization characteristics.

Description

A kind of circularly-polarizedhorn horn antenna based on C-band

Technical field

The utility model relates to a kind of horn antenna, is specifically related to a kind of circularly-polarizedhorn horn antenna based on C-band.

Background technology

Horn antenna is early known, and its version, size and purposes are different.Such as in microwave remote measurement or remote control system, tracking detection can be carried out by circularly-polarizedhorn horn antenna to the changing target of athletic posture.Circularly-polarizedhorn horn antenna is generally made up of feeder equipment, circular polarizer and flaring antenna aperture.The coaxial inner conductor of feeder equipment extends to form an oscillator in its wave-guide cavity wave, and in order to excite electromagnetic wave, this electromagnetic wave forms circular polarization electromagnetic wave along waveguide through circular polarizer, is finally radiated in free space through antenna aperture.

Because the radiance of circularly-polarizedhorn horn antenna and horn antenna caliber size and shape have direct relation, the volume of horn antenna will inevitably be caused to increase so antenna will be made to obtain high-gain.But, the circularly-polarizedhorn horn antenna that volume is larger does not meet again communication system densification and light-weighted growth requirement, therefore will consider circularly-polarizedhorn horn antenna how under limited longitudinal length and aperture area prerequisite when designing, making antenna obtain higher gain, better circular polarization characteristics is one of required key technology solved at present.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of circularly-polarizedhorn horn antenna based on C-band, and it can, under limited longitudinal length and aperture area prerequisite, make antenna obtain higher gain and better circular polarization characteristics.

For solving the problem, the utility model is achieved through the following technical solutions:

Based on a circularly-polarizedhorn horn antenna for C-band, be made up of waveguide coaxial converter, circular polarizer, antenna aperture and chirality Meta Materials coating.Wherein said antenna aperture is the pyramidal horn body of a up/down perforation.Described waveguide coaxial converter comprises coaxial line joint and rectangular waveguide.Rectangular waveguide is an airtight rectangular cavities.The complete opening of upper surface of rectangular waveguide.The lower surface of rectangular waveguide is formed and transforms waveguide short end.Coaxial line jiont treatment is on the left side wall of rectangular waveguide.Described circular polarizer comprises metal partion (metp) and rectangular waveguide.Rectangular waveguide is an airtight square cavity.The complete opening of upper surface of rectangular waveguide, this opening is connected with the under shed of antenna aperture.The right half part opening of the lower surface of rectangular waveguide, the opening in communication of the rectangular waveguide of this opening and waveguide coaxial converter.The left-half of the lower surface of rectangular waveguide forms poled waveguide short-circuit end.Metal partion (metp) is forward stairstepping.Metal partion (metp) is vertically set on the middle of rectangular waveguide, and the inner chamber of rectangular waveguide is divided into the cavity of 2 rectangles in left and right.Described chirality Meta Materials coating is positioned at directly over antenna aperture, and and there is certain interval between antenna aperture.This chirality Meta Materials coating comprises the frequency-selective surfaces unit group that medium substrate and at least one group of being printed on medium substrate turn round zigzag mutually.Often organize the frequency-selective surfaces unit that the upper strata frequency selection unit that the frequency-selective surfaces unit group of turning round zigzag is mutually printed on medium substrate upper surface by symmetry and the lower floor being printed on medium substrate lower surface turn round zigzag mutually to form.Upper strata frequency selection unit and underlying frequency selected cell are respectively combined by the bonding jumper of 3 identical zigzags, the middle part of the bonding jumper of these 3 zigzags is joined together to form a common center, and the bonding jumper of 3 zigzags common about this in be formed centrally Central Symmetry distribution.Upper strata frequency selection unit and underlying frequency selected cell with structure and size completely the same.The center of upper strata frequency selection unit and underlying frequency selected cell is just right, but the rotation direction of bonding jumper is contrary.

In such scheme, described coaxial line joint is sub-miniature A connector.

In such scheme, described waveguide coaxial converter also includes adjustable screw.This adjustable screw is arranged on the right side wall of rectangular waveguide, and to be placed in rectangular waveguide cavity on the axis of middle.Adjustable screw screws in rectangular waveguide cavity.

In such scheme, described metal partion (metp) is equal with the distance of right side wall with the left side wall of rectangular waveguide, and now the inner chamber of rectangular waveguide is divided into the cavity of the identical rectangle of 2, left and right size.

In such scheme, described metal partion (metp) is positioned at directly over the left side wall of waveguide coaxial converter, and both are on same vertical plane, and now the cross-sectional area of the cavity of rectangular waveguide is identical with the cross-sectional area of the right part cavity of rectangular waveguide.

In such scheme, the ladder of described metal partion (metp) is 5 grades.

In such scheme, described rectangular waveguide and rectangular waveguide are by being integrally processed to form overall prismatoid structure.

In such scheme, the frequency-selective surfaces unit group turning round zigzag mutually that described chirality Meta Materials coating is printed is multiple, and these turn round frequency-selective surfaces unit group arrangement in matrix on medium substrate of zigzag mutually.

In such scheme, described upper strata frequency selection unit and underlying frequency selected cell stagger certain angle in a circumferential direction.

In such scheme, rectangular waveguide, rectangular waveguide, metal partion (metp) and antenna aperture are aluminum.

Compared with prior art, the utility model has following characteristics:

1, SF single feed is carried out by the mode of waveguide terminal short circuit.This feeding classification is compared to the complicated duplex feeding mode of tradition, and its performance is more stable, and can avoid ensureing that driving source is the defect of constant amplitude so that affects the situation of polarization performance.This feeding classification is compared to the list feedback mode adding reflection back of the body chamber, and its structure is simpler, and volume reduces further, saves equipment space, and is easier to install.

2, adopt the impedance matching between adjustable screw adjustment coaxial feed and waveguide, depth during adjustment standing wave in main adjustment screw screw-in cavity and position, and then realize good impedance operator, and expand bandwidth, and be easier to manipulation.

3, achieve the miniaturization of feed part, meet communicator miniaturization, light-weighted growth requirement, have a extensive future.

What 4, polarizer adopted is stage shape metal dividing plate, and its machining is simple, debugging difficulty is little.

5, shorten the longitudinal length of antenna aperture, and higher gain can be realized under limited dimensional conditions, there is good impedance matching and circular polarization characteristics simultaneously.

6, above horn antenna, add supported chiral Meta Materials coating, chirality Meta Materials coating can produce nearly zero refracting characteristic to circularly polarised wave, makes antenna in working frequency range, obtain high-gain, low axial ratio characteristic.

What 7, chirality Meta Materials coating adopted is turn round zigzag frequency-selective surfaces mutually, and cost is low, machining is simple.

Accompanying drawing explanation

Fig. 1 is a kind of perspective view of the circularly-polarizedhorn horn antenna based on C-band.

Fig. 2 is the front view of Fig. 1.

Fig. 3 is the end view of Fig. 1.

Fig. 4 is the three-dimensional enlarged diagram of a cellular construction of chirality Meta Materials coating.

Fig. 5 is the return loss plot figure of the novel circularly-polarizedhorn horn antenna of the utility model.

Fig. 6 is the axial ratio curve chart of the novel circularly-polarizedhorn horn antenna of the utility model.

Fig. 7 is the antenna pattern of the novel circularly-polarizedhorn horn antenna of the utility model.

Number in the figure: 1, waveguide coaxial converter; 1-1, coaxial line joint; 1-2, rectangular waveguide; 1-3, adjustable screw; 2, circular polarizer; 2-1, metal partion (metp); 2-2, rectangular waveguide; 3, antenna aperture; 4, chirality Meta Materials coating; 4-1, medium substrate; 4-2, frequency-selective surfaces unit group.

Embodiment

Below in conjunction with the drawings and the specific embodiments, the utility model is described in further details.

Based on a circularly-polarizedhorn horn antenna for C-band, as Figure 1-3, it forms primarily of waveguide coaxial converter 1, circular polarizer 2, antenna aperture 3 and chirality Meta Materials coating 4.Waveguide coaxial converter 1 is transitioned into circular polarizer 2, and circular polarizer 2 is transitioned into antenna aperture 3, and antenna aperture 3 face adds supported chiral Meta Materials coating 4.

Described antenna aperture 3 is the pyramidal horn body of a up/down perforation.

Described waveguide coaxial converter 1 comprises coaxial line joint 1-1, rectangular waveguide 1-2 and adjustable screw 1-3.Rectangular waveguide 1-2 is an airtight rectangular cavities.The complete opening of upper surface of rectangular waveguide 1-2.The lower surface of rectangular waveguide 1-2 is formed and transforms waveguide short end.Coaxial line joint 1-1 is arranged on the left side wall of rectangular waveguide 1-2, and the position of conversion waveguide short end about 1/4 wavelength of distance left side wall.In the present embodiment, described coaxial line joint 1-1 is sub-miniature A connector.Adjustable screw 1-3 is arranged on the right side wall of rectangular waveguide 1-2, and is placed in rectangular waveguide 1-2 cavity on the axis of middle, and namely in the longitudinal direction, the front side wall of adjustable screw 1-3 distance rectangular waveguide 1-2 is equal with the distance of rear wall.Adjustable screw 1-3 perpendicular to the right side wall of rectangular waveguide 1-2, and screws in rectangular waveguide 1-2 cavity.Adjustable screw 1-3 has certain distance with conversion waveguide short end and upper wide wall.

Described circular polarizer 2 comprises metal partion (metp) 2-1 and rectangular waveguide 2-2.Rectangular waveguide 2-2 is an airtight square cavity.The complete opening of upper surface of rectangular waveguide 2-2, this opening is equal with the sectional area of the under shed of antenna aperture 3 and be interconnected.The right half part opening of the lower surface of rectangular waveguide 2-2, this opening is equal with the sectional area of the rectangular waveguide 1-2 opening of waveguide coaxial converter 1 and be interconnected.Can realize being communicated with by ring flange between the under shed of rectangular waveguide 2-2 and the upper shed of rectangular waveguide 1-2, also can by being integrally processed to form overall prismatoid structure.The left-half of the lower surface of rectangular waveguide 2-2 forms poled waveguide short-circuit end.Metal partion (metp) 2-1 is forward stairstepping, and namely the width of front and back from top to bottom of metal partion (metp) 2-1 broadens gradually.In the present embodiment, the ladder of described metal partion (metp) 2-1 is 5 grades.Metal partion (metp) 2-1 is vertically set on the middle of rectangular waveguide 2-2, and parallel with right side wall with the left side wall of rectangular waveguide 2-2, and apart from equal.The bottom of metal partion (metp) 2-1, front portion and rear portion respectively with the lower wall of rectangular waveguide 2-2 inside, be affixed inside front side wall and inside rear wall, the inner chamber of rectangular waveguide 2-2 is divided into the cavity of 2 the identical rectangles of size in left and right by metal partion (metp) 2-1.Described metal partion (metp) 2-1 is positioned at directly over the left side wall of waveguide coaxial converter 1, and both are on same vertical plane, and now the cavity cross-sectional area of rectangular waveguide 1-2 is identical with the cross-sectional area of the right part cavity of rectangular waveguide 2-2.

In the present embodiment, rectangular waveguide 1-2, rectangular waveguide 2-2, metal partion (metp) 2-1 and antenna aperture 3 are aluminum.

Described chirality Meta Materials coating 4 is positioned at directly over antenna aperture 3, and and there is certain interval between antenna aperture 3.In the present embodiment, the size of chirality Meta Materials coating 4 slightly larger than horn mouth diametric plane, and is positioned at distance horn mouth diametric plane and is about half-wave strong point.This chirality Meta Materials coating 4 as shown in Figure 4, comprises the frequency-selective surfaces unit group 4-2 that medium substrate 4-1 and at least one group of being printed on medium substrate 4-1 turn round zigzag mutually.In the present embodiment, the frequency-selective surfaces unit group 4-2 turning round zigzag mutually that described chirality Meta Materials coating 4 is printed is multiple, and these turn round frequency-selective surfaces unit group 4-2 arrangement in matrix on medium substrate 4-1 of zigzag mutually.Often organize the frequency-selective surfaces unit group 4-2 turning round zigzag is mutually printed on medium substrate 4-1 upper surface upper strata frequency selection unit by symmetry to become with the frequency-selective surfaces unit group 4-2 that the lower floor being printed on medium substrate 4-1 lower surface turns round zigzag mutually.Upper strata frequency selection unit and underlying frequency selected cell are respectively combined by the bonding jumper of 3 identical zigzags, the middle part of the bonding jumper of these 3 zigzags is joined together to form a common center, and the bonding jumper of 3 zigzags common about this in be formed centrally Central Symmetry distribution.Angle theta between the bonding jumper of every 2 zigzags in the present embodiment ₁it is 60 °.Upper strata frequency selection unit and underlying frequency selected cell with structure and size completely the same.The center of upper strata frequency selection unit and underlying frequency selected cell is just right, but the rotation direction of bonding jumper is contrary, and the certain angle that staggers in a circumferential direction.In the present embodiment, offset angular (the i.e. mutual torsional angle degree) θ between upper strata frequency selection unit and underlying frequency selected cell ₂it is 30 °.

In the present embodiment, the long 25mm of waveguide coaxial converter 1 inner chamber, rectangular waveguide 1-239.7mm × 18.85mm, sub-miniature A connector centre-to-centre spacing waveguide short end distance is 11.5mm, adjustable screw 1-3 is 24mm apart from waveguide short end distance, screw diameter is 2.5mm, the height that screw screws in cavity is 2.5mm, the rectangular waveguide 2-2 of polarizer is 39.7mm × 39.7mm, the length of polarizer is 90mm, the thickness of metal partion (metp) 2-1 is 2mm, the ladder height on the first rank and length are 39.7mm × 3mm, height and length from second-order ladder to the 5th rank ladder are respectively: 28.3mm × 6.5mm, 17.9mm × 16.1mm, 11.6mm × 16.2mm, 5.2mm × 15.5mm, adopt the method for rounding in waveguide right angle for the ease of integration processing, the radius of rounding is 4mm, the thickness of cavity wall is 2mm.

Based on said structure, Finite Element is first utilized to carry out numerical analysis to described zigzag frequency-selective surfaces of turning round mutually.Medium substrate 4-1 adopts dielectric constant to be 4.5, and loss angle tangent is 0.009, and thickness is the RogersTMM4 of 1.2mm, and turning round zigzag frequency-selective surfaces metal thickness is mutually 35 μm.In simulation process, in order to reduce amount of calculation, utilize periodic boundary condition emulation individual unit can replace the performance of integral unit structure.Wherein, only consider normal incidence, electromagnetic wave edge+Z axis is incident, and electric field is the line polarization wave along X or Y-axis, utilizes two Floquet ports to monitor electromagnetic transmittance and reflectance coefficient.By finding the numerical analysis of cellular construction: no matter electric field is along X or the incidence of Y-axis linear polarization, the all equal and phase 90 ° of the modulus value of transmittance and reflectance coefficient, illustrate that described chirality Meta Materials frequency option table mask has Rotational Symmetry characteristic and outgoing wave has identical circular polarization characteristics, therefore the incident wave of this frequency-selective surfaces to polarization arbitrarily can give off right-handed circular polarization ripple.Antenna can be made to obtain high-gain according to nearly zero refracting characteristic of described chirality Meta Materials coating 4.

Formula involved is above as follows:

T _xx＝T _yy,T _xy＝-T _yx

$T_{cp}=\left(\begin{array}{cc}{T}_{++}& T_{+-}\\ T_{-+}& T_{--}\end{array}\right)=\frac{1}{2}\left(\begin{array}{cc}\left(T_{xx}+T_{yy}\right)+i\left(T_{xy}-T_{yx}\right)& \left(T_{xx}-T_{yy}\right)-i\left(T_{xy}+T_{yx}\right)\\ \left(T_{xx}-T_{yy}\right)+i\left(T_{xy}+T_{yx}\right)& \left(T_{xx}+T_{yy}\right)-i\left(T_{xy}-T_{yx}\right)\end{array}\right)$

$\left(\begin{array}{c}{E}_x^t\\ E_y^t\end{array}\right)=\left(\begin{array}{cc}{T}_{xx}& T_{xy}\\ T_{yx}& T_{yy}\end{array}\right)\left(\begin{array}{c}{E}_x^i\\ E_y^i\end{array}\right),\left(\begin{array}{c}{E}_{+}^t\\ E_{-}^t\end{array}\right)=\left(\begin{array}{cc}{T}_{++}& T_{+-}\\ T_{-+}& T_{--}\end{array}\right)\left(\begin{array}{c}{E}_{+}^i\\ E_{-}^i\end{array}\right)$

${\▿}^2\stackrel{\→}{E}+2\mathrm{\ω}\mathrm{\μ}\mathrm{\κ}\▿\×\stackrel{\→}{E}+{\mathrm{\ω}}^2\mathrm{\μ}\mathrm{\ϵ}\stackrel{\→}{E}=0$

$k_R=\mathrm{\ω}\mathrm{\μ}\mathrm{\κ}+\mathrm{\ω}\sqrt{\mathrm{\μ}\mathrm{\ϵ}+{\mathrm{\μ}}^2{\mathrm{\κ}}^2}$

$k_L=-\mathrm{\ω}\mathrm{\μ}\mathrm{\κ}+\mathrm{\ω}\sqrt{\mathrm{\μ}\mathrm{\ϵ}+{\mathrm{\μ}}^2{\mathrm{\κ}}^2}$

n _±＝n±κ

Wherein, T _xx, T _xy, T _yx, T _yyrepresent linear polarization transmission coefficient, T ₊₊, T _+-, T _-+, T _--represent circular polarization transmission coefficient, its first subscript representative transmission field polarization, second subscript represents incident field polarization; k _r, k _lrepresent dextrorotation and left-hand circular polarization wave number; n _±represent dextrorotation and left-handed refractive index; κ represents the chirality parameter of described chirality Meta Materials coating 4.

As shown in Figure 1, the chirality Meta Materials coating 4 be made up of 11 × 10 periodic units is loaded into apart from circular polarization rectangular horn bore half-wave strong point.Circular polarization horn caliber size is 119mm × 142mm, and the right-handed circular polarization ripple that it gives off remains unchanged through the polarization characteristic of coating aft antenna, and according to nearly zero refracting characteristic of this coating, antenna gain is improved in working band.

Fig. 5 shows, based on the return loss simulation curve of the circularly-polarizedhorn horn antenna of chirality Meta Materials coating 4.As can be seen from Figure, there are two resonance points at 4.6GHz and 4.8GHz, and obtain good coupling in 4.4GHz to 5GHz working band.

Fig. 6 shows, based on the axial ratio simulation curve of the circularly-polarizedhorn horn antenna of chirality Meta Materials coating 4.As can be seen from Figure, in the axial ratio of whole working frequency range internal antenna all within 2.5dB, AR<1.5dB in 4.55GHz to 5GHz band limits, obtaining minimum at 4.7GHz place antenna axial ratio is 0.76dB, and therefore antenna has good circular polarization characteristics.

Fig. 7 shows, based on the directional diagram of circularly-polarizedhorn horn antenna when 4.6GHz of chirality Meta Materials coating 4.As can be seen from Figure, the gain of antenna can reach 12.9dBi, and nearly zero refracting characteristic describing chirality Meta Materials coating 4 can make antenna obtain high-gain.

Claims (10)

1. based on a circularly-polarizedhorn horn antenna for C-band, it is characterized in that: be made up of waveguide coaxial converter (1), circular polarizer (2), antenna aperture (3) and chirality Meta Materials coating (4); Wherein

Described antenna aperture (3) is the pyramidal horn body of a up/down perforation;

Described waveguide coaxial converter (1) comprises coaxial line joint (1-1) and rectangular waveguide (1-2); Rectangular waveguide (1-2) is an airtight rectangular cavities; The complete opening of upper surface of rectangular waveguide (1-2); The lower surface of rectangular waveguide (1-2) is formed and transforms waveguide short end; Coaxial line joint (1-1) is arranged on the left side wall of rectangular waveguide (1-2);

Described circular polarizer (2) comprises metal partion (metp) (2-1) and rectangular waveguide (2-2); Rectangular waveguide (2-2) is an airtight square cavity; The complete opening of upper surface of rectangular waveguide (2-2), this opening is connected with the under shed of antenna aperture (3); The right half part opening of the lower surface of rectangular waveguide (2-2), the opening in communication of the rectangular waveguide (1-2) of this opening and waveguide coaxial converter (1); The left-half of the lower surface of rectangular waveguide (2-2) forms poled waveguide short-circuit end; Metal partion (metp) (2-1) is in forward stairstepping; Metal partion (metp) (2-1) is vertically set on the middle of rectangular waveguide (2-2), and the inner chamber of rectangular waveguide (2-2) is divided into the cavity of 2 rectangles in left and right;

Described chirality Meta Materials coating (4) is positioned at directly over antenna aperture (3), and and there is certain interval between antenna aperture (3); This chirality Meta Materials coating (4) comprises the frequency-selective surfaces unit group (4-2) that medium substrate (4-1) and at least one group of being printed on medium substrate (4-1) turn round zigzag mutually; Often organize the frequency-selective surfaces unit group (4-2) turning round zigzag is mutually printed on medium substrate (4-1) upper surface upper strata frequency selection unit by symmetry to become with the frequency-selective surfaces unit group (4-2) that the lower floor being printed on medium substrate (4-1) lower surface turns round zigzag mutually; Upper strata frequency selection unit and underlying frequency selected cell are respectively combined by the bonding jumper of 3 identical zigzags, the middle part of the bonding jumper of these 3 zigzags is joined together to form a common center, and the bonding jumper of 3 zigzags common about this in be formed centrally Central Symmetry distribution; Upper strata frequency selection unit and underlying frequency selected cell with structure and size completely the same; The center of upper strata frequency selection unit and underlying frequency selected cell is just right, but the rotation direction of bonding jumper is contrary.

2. a kind of circularly-polarizedhorn horn antenna based on C-band according to claim 1, is characterized in that: described coaxial line joint (1-1) is sub-miniature A connector.

3. a kind of circularly-polarizedhorn horn antenna based on C-band according to claim 1, is characterized in that: described waveguide coaxial converter (1) also includes adjustable screw (1-3); This adjustable screw (1-3) is arranged on the right side wall of rectangular waveguide (1-2), and to be placed in rectangular waveguide (1-2) cavity on the axis of middle; Adjustable screw (1-3) screws in rectangular waveguide (1-2) cavity.

4. a kind of circularly-polarizedhorn horn antenna based on C-band according to claim 1, it is characterized in that: described metal partion (metp) (2-1) is equal with the distance of right side wall with the left side wall of rectangular waveguide (2-2), now the inner chamber of rectangular waveguide (2-2) is divided into the cavity of the identical rectangle of 2, left and right size.

5. a kind of circularly-polarizedhorn horn antenna based on C-band according to claim 1 or 4, it is characterized in that: described metal partion (metp) (2-1) is positioned at directly over the left side wall of waveguide coaxial converter (1), and both are on same vertical plane, now the cross-sectional area of the cavity of rectangular waveguide (1-2) is identical with the cross-sectional area of the right part cavity of rectangular waveguide (2-2).

6. a kind of circularly-polarizedhorn horn antenna based on C-band according to claim 1, is characterized in that: the ladder of described metal partion (metp) (2-1) is 5 grades.

7. a kind of circularly-polarizedhorn horn antenna based on C-band according to claim 1 or 3, is characterized in that: described rectangular waveguide (1-2) and rectangular waveguide (2-2) are by being integrally processed to form overall prismatoid structure.

8. a kind of circularly-polarizedhorn horn antenna based on C-band according to claim 1 or 3, it is characterized in that: the upper frequency-selective surfaces unit group (4-2) turning round zigzag mutually printed of described chirality Meta Materials coating (4) is for multiple, and these frequency-selective surfaces unit groups (4-2) turning round zigzag are mutually in the upper arrangement in matrix of medium substrate (4-1).

9. a kind of circularly-polarizedhorn horn antenna based on C-band according to claim 1 or 3, is characterized in that: described upper strata frequency selection unit and underlying frequency selected cell stagger certain angle in a circumferential direction.

10. a kind of circularly-polarizedhorn horn antenna based on C-band according to claim 1 or 3, is characterized in that: rectangular waveguide (1-2), rectangular waveguide (2-2), metal partion (metp) (2-1) and antenna aperture (3) are aluminum.