CN204407491U - Antenna, antenna system and communication equipment - Google Patents

Abstract

The utility model provides a kind of antenna, antenna system and communication equipment.This antenna comprises first substrate, second substrate, first radiation fin and the second radiation fin, this first radiation fin is arranged on this first substrate, this second substrate is arranged on this first radiation fin, this second radiation fin is arranged on this second substrate, this first radiation fin is provided with in this second radiation fin and slots and have the first current feed department, and another in this first radiation fin and this second radiation fin has the second current feed department and the 3rd current feed department, and in this second current feed department and the 3rd current feed department horizontal symmetry axis that lays respectively at place radiation fin and vertical axis of symmetry.Described antenna system comprises above-mentioned antenna, and described communication equipment comprises above-mentioned antenna system.

Description

Antennas, antenna systems and communication equipment

technical field

The utility model relates to the field of wireless communication, in particular to an antenna, an antenna system and communication equipment using the antenna.

Background technique

An antenna is an electronic device used to emit or receive electromagnetic waves. Antennas are used in systems such as radio and television, point-to-point radio communications, radar, and space exploration. With the rapid development of wireless communication technology, the fields involved in antenna technology are becoming more and more extensive. In many special applications, the requirements for antenna performance are getting higher and higher. In modern communications, with the improvement of the integration of communication systems, the antennas used are required to have the characteristics of high gain, broadband or multi-band, circular polarization, miniaturization, and wide coverage.

However, in the current prior art, when multi-band (for example, dual-band) antennas or multi-band circularly polarized antennas are required, different frequency bands are usually implemented through multiple feed ports and multiple antennas. In this case, usually the output of a feed port needs to be processed by a subsequent set of signal processing devices, and multiple antennas are required to respond to antenna signals of different frequency bands. In this way, if multi-band, high-frequency Gain and circular polarization will inevitably increase the number of antennas, but if the number of antennas is increased, the mutual interference between multiple antennas will be enhanced, which will affect the performance of circular polarization, and will also lead to structural design between multiple antennas Therefore, how to make the antenna have the advantages of multi-band, circular polarization, miniaturization, and wide coverage has always been an urgent problem in the industry.

Utility model content

A brief summary of one or more aspects is presented below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all contemplated aspects and is intended to neither identify key or critical elements of all aspects nor attempt to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

According to one aspect of the present invention, an antenna is provided, including a first substrate, a second substrate, a first radiation sheet and a second radiation sheet, the first radiation sheet is arranged on the first substrate, and the second substrate disposed on the first radiating sheet, the second radiating sheet is arranged on the second substrate, one of the first radiating sheet and the second radiating sheet is provided with a slot and has a first feeding part, and the The other of the first radiating sheet and the second radiating sheet has a second feeding part and a third feeding part, and the second feeding part and the third feeding part are respectively located on the horizontal symmetry axis of the radiating sheet and on the vertical axis of symmetry.

In an example, the first radiation sheet is circular, and the second radiation sheet is rectangular.

In an example, the second radiating sheet is provided with a slot and has the first feeding part, and the first feeding part is located on the horizontal symmetry axis or the vertical symmetry axis of the second radiating sheet, and the first The radiation sheet has the second feeding part and the third feeding part.

In an example, the slot on the second radiation sheet is located on a diagonal of a rectangle, and the center of the slot coincides with the center of the rectangle.

In an example, the first radiating sheet is provided with a slot and has the first feeding part, and the first feeding part is located on the horizontal axis of symmetry or the vertical axis of symmetry of the first radiating sheet, and the second The radiation sheet has the second feeding part and the third feeding part.

In an example, the center of the slot on the first radiation sheet coincides with the center of the circle.

In an example, the projection of the slot on the first radiating sheet on the second radiating sheet falls on a rectangular diagonal of the second radiating sheet.

In an example, the size of the second radiation sheet is smaller than the size of the second substrate, the size of the first radiation sheet is smaller than the size of the first substrate, and the size of the first radiation sheet is larger than that of the second radiation sheet size.

In an example, the first power feeding part, the second power feeding part and the third power feeding part are coaxial power feeding parts.

In one example, each power feeder is electrically insulated.

In an example, the first substrate, the second substrate, the first radiating sheet and the second radiating sheet are all planar.

In one example, the projection of the center point of the second radiation sheet on the first radiation sheet coincides with the center point of the first radiation sheet, and the horizontal axis of symmetry and the vertical axis of symmetry of the second radiation sheet are on the first radiation sheet The projections on the radiation sheet coincide with the horizontal symmetry axis and the vertical symmetry axis of the first radiation sheet respectively.

In an example, the first substrate, the second substrate, the first radiating sheet and the second radiating sheet are all convex, or the first substrate, the second substrate, the first radiating sheet and the second radiating sheet are all concave shape.

In an example, the curvatures of the first substrate, the second substrate, the first radiating sheet and the second radiating sheet are all the same.

In one example, both the first substrate and the second substrate are rectangular.

In one example, artificial microstructures are placed horizontally or vertically inside the first substrate.

In one example, artificial microstructures are placed horizontally or vertically inside the second substrate.

In an example, the shape of the artificial microstructure includes an I-shape, or a cross shape, or a snowflake shape, or a cut-off cross-shape.

According to another aspect of the present utility model, an antenna system is provided, including a feed port, an antenna, a combiner, and a power splitter, the antenna is the above-mentioned antenna, and the first end of the combiner is connected to the feeder electrical port, the second end of the combiner is connected to the first end of the power divider, the third end of the combiner is connected to the first feeder, and the second end of the power divider is connected to the second feeder The electric part, and the third end of the power divider are connected to the third power feeding part through a 90° phase shifter.

In an example, the 90° phase shifter realizes the 90° phase shift by adjusting the length of the transmission line.

According to still another aspect of the present utility model, a communication device including the above-mentioned antenna system is provided.

The antenna of the utility model adopts the laminated first radiation sheet and the second radiation sheet, which can reduce the volume and size of the antenna. In the antenna of the present invention, by designing a slot at the center of one of the radiation pieces and designing the proper position of the slot, the radiation piece can achieve circular polarization alone without the cooperation of other radiation pieces. The antenna of the present utility model designs different feeding parts on the horizontal symmetry axis and the vertical symmetry axis of the other radiation sheet respectively, and then connects the two feeding parts through a power divider and a 90° phase shifter, which can This enables the other radiation sheet to realize circular polarization alone. This single antenna of the utility model can realize the technical scheme of circular polarization. Compared with the prior art that requires multiple antennas to cooperate together to realize circular polarization, it obviously has the advantage of low cost, and the structure The design is simple and does not require complicated structural design of multiple antennas. At the same time, the utility model can realize multi-band, circular polarization, miniaturization, wide coverage, etc. by combining various technical means such as slotting, phase shifter, and power divider.

Description of drawings

After reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings, the above-mentioned features and advantages of the present utility model can be better understood. In the drawings, components are not necessarily drawn to scale, and components with similar related properties or characteristics may have the same or similar reference numerals.

Fig. 1 shows a schematic plan view of an antenna according to an embodiment of the present invention;

Fig. 2 shows a schematic top view of an antenna according to an embodiment of the present invention;

Fig. 3 shows a schematic diagram of the feeding part of the antenna of an embodiment of the present invention;

FIG. 4 shows a schematic structural diagram of an antenna system according to an embodiment of the present invention;

Fig. 5 shows the voltage standing wave ratio curve diagram of the antenna of the utility model embodiment;

Fig. 6a, 6b show the gain graph of the antenna of the utility model embodiment;

7a and 7b show the axial ratio curves of the antenna of the embodiment of the present invention.

For clarity, a brief description of the reference numbers is given below:

10: Antenna 10a, 10b: Radiator

11: First Substrate 12: Second Substrate 13: First Radiator 14: Second Radiator

15: slotting 16, 17a, 17b: power feeding part

20: combiner 30: feed port 40: power divider

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in detail. Note that the aspects described below in conjunction with the drawings and specific embodiments are only exemplary, and should not be construed as any limitation on the protection scope of the present utility model.

Fig. 1 shows a schematic plan view of an antenna according to an embodiment of the present invention. Fig. 2 shows a schematic top view of an antenna according to an embodiment of the present invention. Referring to FIG. 1 and FIG. 2 , the antenna 10 of this embodiment may include a first substrate 11 , a second substrate 12 , a first radiation piece 13 and a second radiation piece 14 . The first radiation sheet 13 is arranged on the first substrate 11. The second radiation sheet 14 is disposed on the second substrate 12 . The first substrate 11 and the second substrate 12 are made of a dielectric base material. The first radiation sheet 13 and the second radiation sheet 14 are made of conductive material, such as metal. The radiating sheet can be in the form of a patch, or it can be a plating layer etched by photolithography. The combined unit of each radiating sheet and its corresponding substrate constitutes a receive and transmit path. In this embodiment, the two combination units are further combined into an antenna in a stacked manner. In other words, the second substrate 12 is disposed on the first radiation sheet 13 . The antenna of the utility model adopts the laminated first radiation sheet and the second radiation sheet, which can reduce the volume and size of the antenna.

In this embodiment, in order to realize the circular polarization of the antenna, on the one hand, the method of geometric perturbation is adopted, and the degenerate mode separation element is used to generate two orthogonally polarized degenerate modes with a phase difference of 90°. On the one hand, in order to realize the circular polarization of the antenna, the multi-feed method is also adopted, that is, the antenna is fed through multiple feed points. The two branches feed power to the radiation sheet to excite two orthogonal working modes to achieve circular polarization working conditions.

According to an embodiment of the present invention, a combination of the geometric perturbation method and the double-feed method is adopted, that is, any one of the first radiating sheet 13 and the second radiating sheet 14 adopts the geometric perturbation method, while the other adopts the double-feed method. Feeding method. For example, the first radiator 13 adopts the geometric perturbation method, and the second radiator 14 adopts the double-feed method; or the first radiator 13 adopts the double-feed method, and the second radiator 14 adopts the geometric perturbation method.

In the embodiments shown in FIGS. 1, 2, and 3, the first radiating sheet 13 adopts a double-feed method, so that there are feeding parts 17a, 17b respectively located on the horizontal axis of symmetry and the vertical axis of symmetry of the first radiating sheet, The second radiating sheet 14 adopts the geometric perturbation method, so that there is only a single feeder 16, but it is provided with a slot 15 to play the role of perturbation.

In terms of shape design, the first substrate 11 and the second substrate 12 are preferably rectangular, of course, they may also be in other shapes. The first radiation piece 13 is preferably circular, and the second radiation piece 14 is preferably rectangular with a slot 15 . Of course, it can be understood that the first radiation sheet 13 and the second radiation sheet 14 may also have other shapes. Preferably, the size of the first radiation sheet 13 is smaller than the size of the first substrate 11 , and the size of the second radiation sheet 14 is smaller than that of the second substrate 12 . The size of the first radiating sheet 13 is preferably larger than that of the second radiating sheet 14, so as to ensure that the signal radiated by the first radiating sheet 13 is not blocked by the second radiating sheet 14 on it, as shown in the figure.

Further, the first substrate 11 and the second substrate 12 may have artificial microstructures, such as conductive microstructures. The artificial microstructure in the substrate can be a planar or three-dimensional structure with a certain geometry, and can be placed horizontally and/or vertically in the substrate, also known as a metamaterial microstructure. By providing artificial microstructures in the substrate, the dielectric constant of the substrate can be changed, so that it is suitable to provide substrates with different dielectric constants. As specific examples, the shape of the artificial microstructures may include an I-shape, a cross, a snowflake, or a broken-out sigma. In size, the thickness of the first substrate 11 may be smaller than the thickness of the second substrate 12 .

In this example, preferably, the slot 15 may be a slot located on the diagonal of the rectangle of the second radiating sheet 14 , and its center is located at the center of the second radiating sheet 14 , ie coincides with the center of the rectangle.

Fig. 3 shows a schematic diagram of a feeding part of an antenna according to an embodiment of the present invention. Referring to FIG. 3 , the first radiating sheet 13 has two feeding portions 17 a , 17 b , while the second radiating sheet 14 has a single feeding portion 16 . The power feeding units 17a, 17b and the power feeding unit 16 can respectively input a signal to be transmitted, or output and receive a received signal.

As shown in the figure, the first radiation sheet 13 has a horizontal axis of symmetry X1 and a vertical axis of symmetry Y1, and the second radiation sheet 14 has a horizontal axis of symmetry X2 and a vertical axis of symmetry Y2. Referring to FIG. 3 , as a specific example, the horizontal symmetry axes X1 , X2 are on the same straight line, and the vertical symmetry axes Y1 , Y2 are on the same straight line. In other words, the projection of the center point of the second radiation sheet 14 on the first radiation sheet 13 coincides with the center point of the first radiation sheet 13, and the horizontal axis of symmetry and the vertical axis of symmetry of the second radiation sheet 14 are on the first radiation sheet 13. The projections on are respectively coincident with the horizontal axis of symmetry and the vertical axis of symmetry of the first radiation sheet 13 . For the second radiation sheet 14, its feeder 16 needs to be located on the horizontal axis of symmetry X2 or the vertical axis of symmetry Y2. As shown in FIG. 3 , the feeder 16 is located on the vertical axis of symmetry Y2, but may also be located on the horizontal axis of symmetry X2. For the first radiating piece 13 , one of its two feeding parts 17 a , 17 b needs to be located on the horizontal axis of symmetry X1 , while the other is located on the vertical axis of symmetry Y1 , as shown in FIG. 3 . In addition, the embodiment of the present utility model does not limit the relative positions of the feeder 16 and the feeders 17a, 17b shown in FIG. 3 on the horizontal plane (paper surface in FIG. 3 ), as long as the feeder 16 and the power feeders 17a, 17b can each lead out a transmission line (not shown in the figure).

As mentioned above, the figure only shows an embodiment in which the first radiating sheet 13 adopts the doubly-fed method, while the second radiating sheet 14 adopts the geometric perturbation method. However, in another embodiment not shown in the figure, it is also possible that the first radiating sheet 13 adopts the geometric perturbation method, while the second radiating sheet 14 adopts the double-feed method. In this example, the first radiating sheet 13 has a slot. At this time, the center of the slot can coincide with the center of the first radiating sheet 13. Further, the slot on the first radiating sheet 13 is in the second radiating sheet. The projection on 14 may fall on the rectangular diagonal of the second radiating sheet 14 .

The antenna of this embodiment is designed to have dual-frequency transmission and reception capabilities. For this reason, each power feeder is electrically insulated, so as to respectively input the frequency band signal to be transmitted into the respective unit, or output the received signal from the respective unit.

Preferably, the feeder 16 is a coaxial feeder. Similarly, the feeders 17a, 17b are preferably coaxial feeders. The coaxial feeding mode is adopted to reduce the interference of the feeding structure.

In this embodiment, the first substrate 11 , the second substrate 12 , the first radiation sheet 13 and the second radiation sheet 14 may all be planes. However, the present invention is not limited thereto. In other embodiments, the first substrate 11, the second substrate 12, the first radiating sheet 13 and the second radiating sheet 14 can all be curved surfaces, such as concave or convex shapes . The first substrate 11 , the second substrate 12 , the first radiating sheet 13 and the second radiating sheet 14 may have the same curvature, so that these structural layers 11 - 14 are bonded due to their similar three-dimensional shapes. In this embodiment, the first substrate 11, the second substrate 12, the first radiation piece 13 and the second radiation piece 14 can be in a conformal concave shape or a convex shape, so that the antenna design can be made more compact , reduce the size of the plane, and the conformal design of this curved surface can also increase the radiation area of the antenna, concentrate the radiation energy, and then improve the gain of the antenna and expand the coverage.

FIG. 5 shows a graph of the voltage standing wave ratio of the antenna in FIG. 1 . Figures 6a, 6b show gain curves for the antenna in Figure 1 . Figures 7a and 7b show the axial ratio curves of the antenna in Figure 1. Referring to Figures 7a and 7b, the antenna of the embodiment of the present invention can achieve an axial ratio of less than or equal to 6 within the range of ±50°. Combining FIG. 5 to FIG. 7a, 7b, it can be known that the antenna in the present invention can generate two circularly polarized frequency bands.

In the prior art, it is necessary to use two antennas or even more antennas to form a dual-band or multi-band circularly polarized antenna. Therefore, in the back-end signal processing, two or even more sets of signal processing devices are usually required to Signal processing is performed separately, which obviously increases the size, weight and cost of the equipment.

However, according to the antenna design of the present invention and the actual effect diagrams of Fig. 5 to Fig. 7a and 7b, a single radiation piece can achieve circular polarization effect, and also has dual frequency bands, high gain and good axial ratio performance advantage.

Fig. 4 shows a schematic structural diagram of an antenna system according to an embodiment of the present invention. Referring to FIG. 4, the antenna system of this embodiment includes the antenna 10, the combiner 20, the feeding port 30, and the power splitter 40 of the embodiment shown in FIG. The first end of the combiner 20 is connected to the feeding port 30 , the second end of the combiner 20 is connected to the first end of the power divider 40 , and the third end of the combiner 20 is connected to the feeding part 16 of the radiation sheet 10 b. The second end of the power divider 40 is connected to the feeding part 17a of the radiation piece 10a, and the third end of the power divider 40 is connected to the feeding part 17b of the radiation piece 10a through a 90° phase shifter 50 .

In the embodiment shown in Figures 1-3, the first radiating piece 13 has two feeders 17a, 17b, at this time, the radiating piece 10a in Figure 4 corresponds to the first radiating piece 13, and the radiating piece 10b corresponds to the second Radiation sheet 14. However, in the embodiment where the first radiating piece 13 adopts the geometric perturbation method and the second radiating piece 14 adopts the double-feed method, the second radiating piece 14 has two feeding parts. At this time, the radiating piece 10a in FIG. 4 corresponds to The second radiation sheet 14 , the radiation sheet 10 b corresponds to the first radiation sheet 13 .

On the one hand, the combiner 20 divides the input excitation signal into signals of multiple frequency bands, which are respectively output to the corresponding radiation pieces of the antenna. At this time, the combiner can also be called a splitter. Correspondingly, the antenna system is in the state of transmitting signals. On the other hand, the combiner 20 combines the received signals of multiple frequency bands to one feeding port, and the antenna system is in the state of receiving signals at this time. For example, in this embodiment, the combiner 20 is responsible for outputting the first frequency band of the excitation signal provided by the feed port 30 to the radiation piece 10a of the antenna 10, and outputting the second frequency band of the excitation signal to the radiation of the antenna 10. Sheet 10b. On the other hand, the combiner 20 is responsible for combining signals of various frequency bands from the radiation pieces 10 a and 10 b respectively, and outputting them to the feeding port 30 . For example, the frequency of the second frequency band may be higher than that of the first frequency band, forming a combination of high frequency and low frequency.

The power splitter 40 is a device that divides one input signal energy into two or multiple output signal energies, and can also conversely synthesize multiple signal energies into one output. For example, in this embodiment, the power splitter 40 is responsible for dividing the excitation signal of the first frequency band split from the combiner 20 into two paths and outputting it to the radiation piece 10a of the antenna 10 under the antenna transmitting state. On the one hand, it is responsible for combining the signals from the respective radiation pieces 10 a and 10 b together and outputting them to the combiner 20 in the receiving state of the antenna.

In particular, the two signals output by the power divider 40 pass through the 90° phase shifter, so that there is a 90° phase difference between the signals input to the two feeders 17a, 17b of the radiator 10a, thereby exciting two quadrature Working mode, to achieve circular polarization working conditions. The 90° phase shifter can be realized by any suitable means. In one example, this can be achieved simply by adjusting the length of the transmission line. For example, by using different lengths of the transmission lines between the second and third ends of the power splitter 40 and the feeds 17a, 17b, a 90° phase shift of the excitation signal can be achieved.

During transmission work, the excitation signal enters the first end of the combiner 20 from a feed port 30 (it is the input end at this moment), and after the combiner 20, it is divided into two paths of signals, wherein one path of signals passes through the second end ( At this time, it is the output end) and the transmission line are provided to the first end of the power divider 40 (it is the input end at this time), and the other signal is provided to the antenna 10 through the third end (it is the output end at this time) and the transmission line. The power feeding part 16 of the radiation sheet 10b. The second end of the power divider 40 (which is the output end at this time) is connected to the feeder 17a of the radiation sheet 10a, and the third end of the power divider 40 (which is the output end at this time) is connected through a 90° phase shifter. The power feeding part 17b of the radiation sheet 10a.

During receiving operation, the two signals from the radiation piece 10a pass through the power divider 40 and the signals from the radiation piece 10b pass through the combiner 20 to form a final received signal, which is processed by the subsequent receiving circuit.

Therefore, the utility model only needs one feed port output, and only one set of signal processing device can be used, which greatly simplifies the structure of the antenna and reduces the cost.

The circularly polarized antenna and the antenna system of the above embodiments of the present invention can be combined in communication equipment.

Due to the advantages of low profile, light weight, small size, easy conformality and mass production, antennas can be widely used in various fields of measurement and communication. The application range of the circularly polarized antenna in the embodiment of the utility model is wider, and can be applied to fields such as mobile communication and satellite navigation. The main advantages of circularly polarized antennas in practical applications are:

1) Any polarized electromagnetic wave can be decomposed into two circularly polarized waves with opposite hand direction. For example, for linearly polarized waves, it can be decomposed into two circularly polarized waves with opposite and equal amplitudes. Therefore, electromagnetic waves of any polarization can be received by circularly polarized antennas, and electromagnetic waves emitted by circularly polarized antennas can be received by antennas of arbitrary polarization, so circularly polarized antennas are commonly used in electronic reconnaissance and jamming;

2) The rotation orthogonality of circularly polarized antennas is widely used in applications such as communications, radar polarization diversity, and electronic countermeasures;

3) When the circularly polarized wave is incident on a symmetrical target (such as a plane, a spherical surface, etc.), the direction of rotation is reversed, so the circularly polarized antenna suppresses rain and fog interference and resists multipath reflection in the fields of mobile communication and satellite navigation.

The previous description of the present disclosure is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the present disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (21)

1. an antenna, it is characterized in that, comprise first substrate, second substrate, first radiation fin and the second radiation fin, described first radiation fin is arranged on described first substrate, described second substrate is arranged on described first radiation fin, described second radiation fin is arranged on described second substrate, one in described first radiation fin and described second radiation fin is provided with and slots and have the first current feed department, and another in described first radiation fin and described second radiation fin has the second current feed department and the 3rd current feed department, and in described second current feed department and the described 3rd current feed department horizontal symmetry axis that lays respectively at place radiation fin and vertical axis of symmetry.

2. antenna as claimed in claim 1, is characterized in that, described first radiation fin is circular, and described second radiation fin is rectangle.

3. antenna as claimed in claim 2, it is characterized in that, described second radiation fin is provided with slots and has described first current feed department, and in the described first current feed department horizontal symmetry axis that is positioned at described second radiation fin or vertical axis of symmetry, and described first radiation fin has described second current feed department and described 3rd current feed department.

4. antenna as claimed in claim 3, it is characterized in that, the described fluting on described second radiation fin is positioned on rectangle diagonal, and the center superposition of the center of described fluting and described rectangle.

5. antenna as claimed in claim 2, it is characterized in that, described first radiation fin is provided with slots and has described first current feed department, and in the described first current feed department horizontal symmetry axis that is positioned at described first radiation fin or vertical axis of symmetry, and described second radiation fin has described second current feed department and described 3rd current feed department.

6. antenna as claimed in claim 5, it is characterized in that, the center of the described fluting on described first radiation fin overlaps with the center of circle of described circle.

7. antenna as claimed in claim 6, it is characterized in that, the projection be recessed on described second radiation fin described on described first radiation fin drops on the rectangle diagonal of described second radiation fin.

8. antenna as claimed in claim 1, it is characterized in that, the size of described second radiation fin is less than the size of described second substrate, and the size of described first radiation fin is less than the size of described first substrate, and the size of described first radiation fin is greater than the size of described second radiation fin.

9. antenna as claimed in claim 1, it is characterized in that, described first current feed department, described second current feed department and described 3rd current feed department are coaxial feed portion.

10. antenna as claimed in claim 1, it is characterized in that, each current feed department is electrically insulated.

11. antennas as claimed in claim 1, it is characterized in that, described first substrate, second substrate, the first radiation fin and the second radiation fin are flat shape.

12. antennas as claimed in claim 1, it is characterized in that, the projection of central point on described first radiation fin of described second radiation fin and the point coincides of described first radiation fin, and the horizontal symmetry axis of described second radiation fin and the projection of vertical axis of symmetry on described first radiation fin overlap with the horizontal symmetry axis of described first radiation fin and vertical axis of symmetry respectively.

13. antennas as claimed in claim 1, it is characterized in that, described first substrate, second substrate, the first radiation fin and the second radiation fin are convex shape, or described first substrate, second substrate, the first radiation fin and the second radiation fin are concave.

14. antennas as claimed in claim 13, is characterized in that, described first substrate, second substrate, the first radiation fin are all identical with the curvature of the second radiation fin.

15. antennas as claimed in claim 1, it is characterized in that, described first substrate and described second substrate are rectangle.

16. antennas as claimed in claim 1, is characterized in that, be placed with man-made microstructure in the inner horizontal direction of described first substrate or vertical direction.

17. antennas as claimed in claim 1, is characterized in that, be placed with man-made microstructure in the inner horizontal direction of described second substrate or vertical direction.

18. antennas as described in claim 16 or 17, is characterized in that, the hollow that the shape of described man-made microstructure comprises I-shaped or cross or snowflake shape or disconnects.

19. 1 kinds of antenna systems, it is characterized in that, comprise feed port, antenna, mixer and power splitter, described antenna is the antenna according to any one of claim 1 to 18, the first end of described mixer connects described feed port, second end of described mixer connects the first end of described power splitter, first current feed department described in the three-terminal link of described mixer, second end of described power splitter connects described second current feed department, and the 3rd end of described power splitter connects described 3rd current feed department by 90 ° of phase shifters.

20. antenna systems as claimed in claim 19, is characterized in that, described 90 ° of phase shifters realize 90 ° of phase shifts by regulating the length of transmission line.

21. 1 kinds of communication equipments, is characterized in that, comprise the antenna system according to any one of claim 19 to 20.