CN204407501U - Communication antenna, antenna system and communication apparatus - Google Patents

Abstract

The utility model relates to a communication antenna, an antenna system and communication equipment. The communication antenna may include a first radiator, wherein the first radiator includes a first substrate and a first radiation sheet disposed on the first substrate, the first radiation sheet has a first feeding part and a cut corner, and the first radiation sheet The radiating surface is a convex surface; and the second radiating body, wherein the second radiating body includes a second substrate and a second radiating sheet disposed on the second substrate, the second radiating sheet has a second feeding portion and a cut corner, and the second radiating sheet The radiating surface of the second radiating sheet is convex, wherein the second substrate of the second radiating body is stacked on the first radiating sheet of the first radiating body.

Description

Communication antenna, antenna system and communication equipment

technical field

The utility model relates to an antenna, in particular to a communication antenna, an antenna system with the communication antenna, and a communication device using the communication antenna or the antenna system.

Background technique

An antenna is an electronic device used to transmit and/or receive electromagnetic waves wirelessly and is widely deployed in systems such as radio and television, 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 specific applications, the requirements for antenna performance are getting higher and higher, so there are different types of antennas to meet the different needs of various applications, such as microstrip antennas, loop antennas, horn antennas, planar antennas, etc. 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, or wide coverage.

In the prior art, when a multi-band (for example, dual-band) antenna or a multi-band circularly polarized antenna needs to be used, different frequency bands are usually realized respectively by using multiple ports and multiple antennas. In this case, usually multiple sets of signal processing devices are required to process different antenna signals, or a set of signal processing devices is used to process multiple sets of signals in a time-division multiplexed manner. Therefore, the multi-band antenna in the prior art has disadvantages such as a large number of antennas, a complex structure, a large size, poor polarization and gain performance, and the like.

Utility model content

The technical problem to be solved by the utility model is to provide a communication antenna, especially a dual-band communication antenna, and further provide a circularly polarized dual-band antenna system and communication equipment using such a communication antenna or antenna system.

In order to solve the above-mentioned technical problems, the utility model provides a communication antenna, comprising: a first radiator, wherein the first radiator includes a first substrate and a first radiation sheet arranged on the first substrate, the first radiation sheet has The first feeding part and the chamfer, and the radiating surface of the first radiating sheet is a convex surface; and the second radiating body, wherein the second radiating body includes a second substrate and a second radiating sheet arranged on the second substrate, the second The radiating sheet has a second feeding portion and a cut corner, and the radiating surface of the second radiating sheet is convex, wherein the second substrate of the second radiating body is stacked on the first radiating sheet of the first radiating body.

Preferably, the first radiator and the second radiator implement dual-band linear polarization respectively.

Preferably, the first radiator and the second radiator work in the same dual frequency band.

Preferably, the first radiator and the second radiator implement different linear polarization directions.

Preferably, each of the first radiation sheet and the second radiation sheet is a rectangle with cut corners.

Preferably, the first radiation sheet has two cut corners on the first diagonal, and the second radiation sheet has two cut corners on the second diagonal.

Preferably, the first diagonal of the first radiating sheet forms an angle with the second diagonal of the second radiating sheet.

Preferably, the first diagonal of the first radiation sheet is perpendicular to the second diagonal of the second radiation sheet.

Preferably, geometric centers of the first radiating sheet and the second radiating sheet are aligned with each other.

Preferably, the first feeder and the second feeder are coaxial feeders.

Preferably, the first feeding part is arranged on the first symmetry axis of the first radiating sheet, the second feeding part is arranged on the second symmetry axis of the second radiating sheet, and the first A symmetry axis is in a different direction from the second symmetry axis.

Preferably, the first axis of symmetry is orthogonal to the second axis of symmetry.

Preferably, the size of the first radiation sheet is larger than the size of the second radiation sheet.

Preferably, the dielectric constant of the second substrate is greater than that of the first substrate.

Preferably, the first radiator and the second radiator are placed in a cavity, wherein the cavity opens in a radiation direction of the communication antenna.

Preferably, the cavity is a circular or square cavity.

Preferably, there is a filling material between the first radiator and the second radiator and the cavity.

Preferably, the first substrate and the second substrate are each rectangular.

Preferably, the first substrate and/or the second substrate are made of a dielectric substrate doped with conductive microstructures.

Preferably, the first radiator and the second radiator are electrically insulated from each other.

Preferably, the communication antenna further includes: a frequency-selective radome, and the frequency-selective radome is arranged in a radiation direction of the communication antenna.

In another embodiment, the utility model provides an antenna system, comprising: a feed port; a power divider, the first end of which is connected to the feed port; the above-mentioned communication antenna , wherein the second end of the power divider is connected to the first feeder via a first feeder line, and the third end of the power divider is connected to the second feeder via a second feeder line The electrical part, wherein the signal on the first feeder line and the signal on the second feeder line are phase-shifted from each other.

Preferably, there is a phase shifter on the first feeder line or the second feeder line.

Preferably, the phase shifter is a 90° phase shifter.

Preferably, the lengths of the first feeder line and the second feeder line differ by 1/4 wavelength.

In a further embodiment, the present invention provides a communication device, comprising the above-mentioned communication antenna or the above-mentioned antenna system.

Due to the adoption of the above technical scheme, the utility model has the following significant advantages compared with the prior art:

The communication antenna of the utility model adopts the laminated first radiator and the second radiator, which can reduce the volume and size of the communication antenna. By making each radiator of the antenna have a convex radiation surface, it is beneficial to improve the radiation efficiency, and further meet the miniaturization and conformal design requirements of the special application environment. For example, in the case where the radiating surfaces of the first radiating sheet and the second radiating sheet are convex, the first radiating body and the second radiating body (and optionally the bottom of the cavity) may be a conformal convex structure, such that The communication antenna can be more compact.

The communication antenna in the utility model can make each radiation sheet realize dual-band linear polarization by cutting the angle of the radiation sheet. Furthermore, the first radiator and the second radiator can work in the same dual frequency band. By setting the linear polarization directions of the first radiating sheet and the second radiating sheet, one communication antenna can be used to realize dual linear polarization and dual frequency bands.

Furthermore, in the antenna system of the present invention, by shifting the phase of the input signal entering one of the radiators, the laminated first radiator and the second radiator can form circularly polarized or elliptically polarized radiation signals. Compared with the prior art that requires two sets of signal processing devices to realize dual-band circular polarization, or uses one set of signal processing devices to process two sets of signals in time-division multiplexing, the utility model reduces the volume, weight and cost.

To sum up, the communication antenna of the present invention has the advantages of low profile, light weight, small volume, easy conformal shape and mass production, etc., can realize dual-band linear polarization or even further realize dual-band circular polarization, and can be widely used in measurement and communication fields.

Description of drawings

In order to make the above-mentioned purposes, features and advantages of the present utility model more understandable, the specific implementation of the present utility model will be described in detail below in conjunction with the accompanying drawings, wherein:

FIG. 1 shows a schematic diagram of a three-dimensional structure of a communication antenna according to an embodiment of the present invention;

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

Figure 3a shows an exploded schematic diagram of a communication antenna with an exemplary cavity and a radome according to an embodiment of the present invention;

Fig. 3b shows a schematic plan view of an exemplary communication antenna placed in a square cavity according to an embodiment of the present invention;

Fig. 3c shows a schematic plan view of an exemplary communication antenna placed in a circular cavity according to 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 a shows the voltage standing wave ratio curve diagram of the communication antenna according to the embodiment of the present invention;

Fig. 5b shows the voltage standing wave ratio curve diagram of the antenna system according to the embodiment of the present invention;

FIG. 6 shows a gain curve diagram of an antenna system according to an embodiment of the present invention;

Fig. 7 shows an axial ratio graph of an antenna system according to an embodiment of the present invention.

Detailed ways

The utility model will be further described below in conjunction with specific embodiments and accompanying drawings, and more details have been set forth in the following description so as to fully understand the utility model, but the utility model can obviously be in many other ways different from this description To implement, those skilled in the art can make similar promotion and deduction according to the actual application situation without violating the connotation of the utility model, so the content of this specific embodiment should not limit the protection scope of the utility model.

FIG. 1 shows a schematic perspective view of a communication antenna 100 according to an embodiment of the present invention. FIG. 2 shows a schematic plan view of a communication antenna 100 according to an embodiment of the present invention. 1 and 2, the communication antenna 100 may include a first radiator 10 and a second radiator 20 stacked, wherein the first radiator 10 includes a first substrate 11 and a second radiator disposed on the first substrate 11. A radiation sheet 12 , and the second radiator 20 includes a second substrate 21 and the second radiation sheet 22 disposed on the second substrate 21 . The second substrate 21 of the second radiator 20 is stacked on the first radiator 12 of the first radiator 10 .

The first radiation sheet 12 and the second radiation sheet 22 are made of conductive material (such as metal). The first radiating sheet 12 and the second radiating sheet 22 may be patches on the first substrate 11 and the second substrate 21 respectively, or may be plating layers etched by photolithography on the first substrate 11 and the second substrate 21 respectively. . The radiator composed of each radiator and the corresponding substrate constitutes a sending/receiving unit. In one embodiment, the radiation surface (upper surface in FIG. 1 ) of the first radiation sheet 12 is convex. Similarly, the radiation surface (upper surface in FIG. 1 ) of the second radiation sheet 22 is convex. The first substrate 11 may conform to the first radiation sheet 12 in a convex shape, and the second substrate 21 may conform to the second radiation sheet 22 in a convex shape. In other embodiments, the first substrate 11 and the second substrate 21 may also each have a flat structure or other shapes.

It is shown in FIG. 1 that the first substrate 11, the first radiating sheet 12, the second substrate 21 and the second radiating sheet 22 are each rectangular, but in other alternative embodiments, other shapes may be used respectively, and they may be the same as/ similar or different. For example, the first radiation sheet 12 and the second radiation sheet 22 may have the same shape. Preferably, the size of the first radiating sheet 12 may be larger than that of the second radiating sheet 22 , for example, so that the edge of the first radiating sheet 12 is not blocked by the second radiating sheet 22 (or the second radiating body 20 ). In one embodiment, the geometric centers of the first radiating sheet 12 and the second radiating sheet 22 may be aligned with each other. The first substrate 11 and the second substrate 21 can be made of a dielectric substrate, so that when the first radiator 10 and the second radiator 20 are stacked, the second substrate 21 makes the first radiator 10 and the second radiator 20 mutually electrical insulation. Meanwhile, the first substrate 11 can isolate the communication antenna 100 from other structural components.

Further, the first substrate 11 and the second substrate 21 may have conductive (for example, metal) microstructures therein. The conductive microstructure in the substrate has a certain geometrical planar or three-dimensional structure, and can be placed horizontally and/or vertically in the substrate, also known as a metamaterial microstructure. By providing conductive 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. In one embodiment, the dielectric constant of the second substrate 21 may be greater than that of the first substrate 11 .

As shown in FIGS. 1 and 2 , the first radiating sheet 12 and the second radiating sheet 22 may each have a cut corner, that is, a certain/certain corner or part of the material of the radiating sheet is cut off. By controlling the geometry of the cut angle (size, position, cut angle, etc.) of the cut angle, the first radiating sheet 12 and the second radiating sheet 22 can each realize dual-band linear polarization, and can control the frequency band position of the dual-band. In one embodiment, the first radiating sheet 12 and the second radiating sheet 22 are rectangular radiating sheets, each of which has a hexagonal shape after two diagonal corners on a diagonal line are cut off. For example, the first radiating sheet 12 may have two cut corners 15a and 15b on the first diagonal A, and the second radiating sheet 22 may have two cut corners 25a and 25b on the second diagonal B. In one embodiment, the first diagonal A of the first radiating sheet 12 forms an angle with the second diagonal B of the second radiating sheet 22 . Preferably, the first diagonal line A of the first radiation sheet 12 and the second diagonal line B of the second radiation sheet 22 are perpendicular to each other. It can be understood that, in other embodiments of the present invention, the two cut corners of the first radiating sheet 12 and the second radiating sheet 22 may not be on the diagonal. By controlling the cut angles of the first radiator 12 and the second radiator 22, the first radiator 10 and the second radiator 20 can each transmit/receive dual-band linearly polarized signals, and the first radiator 10 and the second radiator Body 20 can operate in the same dual band. Since the first diagonal line A and the second diagonal line B form a certain angle, the linearly polarized signals of the first radiator 10 and the second radiator 20 can form circular polarization or elliptical polarization when there is a phase shift with each other. chemical radiation signal. Especially when the diagonals A and B where the cut corners are located are vertical, the two linear polarizations can be in a state perpendicular to each other, that is, one is horizontal polarization and the other is vertical polarization, so that one of the line polarizations When the signal has a phase shift of 90 degrees, it forms a good circularly polarized radiation signal with another route polarized signal.

The cut corners can have various shapes, such as size, position, cut angle (ie, angle with the edge of the radiation sheet) and so on. Preferably, the angle of each chamfer 15a, 15b, 25a and 25b is selected between 35 degrees and 55 degrees. More preferably, the angle of each chamfer 15a, 15b, 25a and 25b is 45 degrees. It can be understood that the cut angle can also be other angles. Preferably, the respective chamfers 15a, 15b, 25a and 25b have the same shape.

Figures 1 and 2 also show that the first radiating sheet 12 has a first feeder 16 (not shown in Figure 1, shown in a dotted circle in Figure 2, indicating that it is located on the first radiating sheet 12 below), the second The radiation sheet 22 has a second feeder 26 . The first feeder 16 and the second feeder 26 can respectively receive input signals from feed sources to radiate out through the first radiating sheet 12 and the second radiating sheet 22 , or will be radiated by the first radiating sheet 12 and the second radiating sheet 22 The received signal is output to the processing unit. In one embodiment, the first feeding part 16 may be located on the horizontal axis of symmetry of the first radiation piece 12 , and the second feeding part 26 may be located on the vertical axis of symmetry of the second radiation piece 22 . Alternatively, the first feeding part 16 may be located on the vertical axis of symmetry of the first radiation piece 12 , and the second feeding part 26 may be located on the horizontal axis of symmetry of the second radiation piece 22 . Wherein, the first feeding part 16 and the second feeding part 26 can move on the symmetry axis where they are located, so as to adjust the impedance matching of the corresponding radiation pieces. Preferably, the first feeder 16 is a coaxial feeder. Similarly, the second power feeder 26 is preferably a coaxial power feeder. The coaxial feeding mode is adopted to reduce the interference of the feeding structure.

The communication antenna 100 described above has a compact structure, and each radiation sheet and substrate can have a conformal structure, which reduces the size of the communication antenna and improves the integration. On the other hand, by setting cut angles on the first radiating sheet 12 and the second radiating sheet 22, each radiating sheet can realize dual-band linear polarization, and the first radiating sheet 12 and the second radiating sheet 22 can be controlled as required. working frequency band and linear polarization direction, so that one communication antenna 100 can be used to realize dual linear polarization and dual frequency bands.

Figure 3a shows an exploded schematic view of a communication antenna with an exemplary cavity 300 and optional radome 310 according to an embodiment of the present invention. The communication antenna 100 shown in FIG. 1 may be placed in a cavity 300 , wherein the cavity 300 is opened in the radiation direction of the communication antenna 100 . The cavity 300 may have various suitable shapes, such as a square or circular cavity. As an example and not a limitation, Fig. 3b shows a schematic plan view of an exemplary communication antenna 100 placed in a square cavity 300b according to an embodiment of the present invention, and Fig. 3c shows an exemplary communication antenna according to an embodiment of the present invention 100 is a schematic plan view of being placed in a circular cavity 300c.

The functions of the cavity 300 include but are not limited to: support the communication antenna 100, and protect the communication antenna 100 from the influence of the surrounding environment and the influence of human operation. The material of the cavity 300 is not limited, and it is usually metal, but it can also be a non-metallic material suitable for implementation requirements. When the cavity 300 is made of conductive material, the microstrip antenna 100 preferably does not contact the sidewall of the cavity 300 . As an optional solution, a filling material may be appropriately disposed between the cavity 300 and the communication antenna 100 to better fix, damp and/or support. For example, a foam filling material can be placed in the cavity 300 to fill the gap between the communication antenna 100 and the cavity 300 to prevent the communication antenna 100 from being unstable in air pressure during use. In one embodiment, the first radiator 10 and the second radiator 20 of the communication antenna 100 and the bottom of the cavity 300 may be a conformal convex structure, so that the communication antenna may be more compact.

In an optional embodiment, a radome 310 may be provided in the radiation direction of the communication antenna 100 . The radome 310 may be fixed to the substrate of the communication antenna 100 , or may be fixed to the cavity 300 so as to cover the opening of the cavity 300 in the case of the cavity 300 . The radome 310 can be configured to be conformal (eg, convex) with the communication antenna 100 and/or the cavity 300 , so as to fully meet the requirement of miniaturization. The radome 310 may also have other shapes, such as flat plate. The radome 310 can provide protection for the communication antenna 100 , and preferably has good wave-transmitting performance, so as not to affect the signal radiation/reception of the communication antenna 100 .

In a further embodiment, the radome 310 may be a frequency-selective radome 310 , which has good wave-transmitting performance and can generate a desired electromagnetic response, thereby controlling the propagation of electromagnetic waves.

Fig. 4 shows a schematic diagram of an antenna system according to an embodiment of the present invention. The antenna system shown in FIG. 4 includes a front-end feeding port 410 , a power divider 420 , a first feeding line 430 a and a second feeding line 430 b , and the communication antenna 100 described in FIGS. 1 and 2 . In one embodiment, the power splitter 420 may be a 1/2 power splitter. The feeding port 410, the power divider 420, the first feeding line 430a and the second feeding line 430b constitute the feeding network of the antenna system, wherein the first feeding line 430a and the second feeding line 430b are respectively connected to the first The first feeding part 16 of the radiator 10 and the second feeding part 26 of the second radiator 20 . For example, the first end of the power divider 420 is connected to the feed port 410, the second end of the power divider 420 is connected to the first feeder 16 via the first feed line 430a, and the third end of the power divider 420 It is connected to the second power feeding part 26 via the second power feeding line 430b. The power splitter 420 can split the excitation signal from the feed port 410 into multiple (for example, two) excitation signals to be delivered to the first feed line 430a and the second feed line 430b, or to transmit The received signals from the electric line 430 a and the second feeding line 430 b from multiple antenna radiators are combined into one receiving signal and sent to the feeding port 410 . The power divider 420 can adopt a 3dB power divider in a microstrip line power division mode, so as to save space and effectively reduce the weight of the system. Furthermore, the 3dB power divider can remove the isolation resistor.

In one embodiment, the signal on the first feed line 430a and the signal on the second feed line 430b are phase shifted from each other. In one embodiment, as in the antenna system depicted in FIG. 4, at least one of the first feed line 430a and the second feed line 430b may have a phase shifter 440 (eg, a 90° phase shifter) , so that the excitation signals fed into the first radiator 10 and the second radiator 20 are out of phase with each other by 90°, so that the circular polarization working mode of the communication antenna 100 can be realized. In another embodiment (not shown), the lengths of the first feeding line 430a and the second feeding line 430b may differ by 1/4 wavelength, so as to achieve a 90° phase shift. As mentioned above, the communication antenna 100 can realize dual linear polarization and dual frequency bands through the laminated first radiator 10 and second radiator 20 . By shifting the phase of the input signal entering one of the radiators by 90°, the linearly polarized dual-band signal of the first radiator 10 and the linearly polarized dual-band signal of the second radiator 20 with a phase shift of 90° can be superimposed to form a circle Polarized or elliptically polarized radiated signals. That is, the antenna system of the present invention can finally realize single-port dual-band circular polarization.

When carrying out the transmitting work, one road excitation signal enters the first end of the power divider 420 (it is the input end at this moment) from the feed port 410, is divided into two road signals through the power splitter 420, wherein one road signal passes through the second end ( At this time, it is the output end) and the first feeder line 430a are provided to the first feeder 16 of the first radiator 10 in the communication antenna 100, and another signal passes through the third end (it is the output end at this time) and The second feeding line 430 b (and the phase shifter 440 ) are provided to the second feeding part 26 of the second radiator 20 of the communication antenna 100 . When receiving work, the two received signals received by the first radiator 10 and the second radiator 20 are respectively transmitted from the first feeder 16 and the second feeder 26 through the first feeder 430a and the second feeder 430a. The electric line 430b (and the phase shifter 440) are transmitted to the second end (which is the input end) and the third end (which is the input end) of the power divider 420 at this time, and are combined into a signal through the power divider 420 , and then output to the feed port 410 from the first terminal (which is the output terminal at this time), and be processed by the subsequent receiving circuit. Those skilled in the art can understand that the phase shifter 440 can be located on the first feeding line 430a, and the working principle is the same.

Therefore, only one set of signal processing devices can be used to realize dual-band circular polarization, which greatly simplifies the structure of the antenna and reduces the cost. The communication antenna or antenna system of the above-mentioned embodiments of the present invention can be combined in a communication device, so as to send/receive signals for the communication device.

Fig. 5a shows a radiation voltage standing wave ratio graph of the communication antenna 100 according to an embodiment of the present invention, wherein the horizontal axis is frequency, and the vertical axis is the real part of voltage standing wave ratio (VSWR). The voltage standing wave ratio shown in FIG. 5a shows that the communication antenna 100 (or one of the radiators 20 or 30) as shown in FIG. Good VSWR in both frequency bands.

Fig. 5b shows a graph of the received voltage standing wave ratio of the antenna system according to an embodiment of the present invention, wherein the horizontal axis is the frequency, and the vertical axis is the real part of the voltage standing wave ratio (VSWR). The voltage standing wave ratio shown in FIG. 5b shows the signal received by the communication antenna 100 (comprising two antenna radiators) of the antenna system shown in FIG. signal, which has a good VSWR over the entire operating frequency band.

Fig. 6 shows the gain curve graph of the antenna system according to an embodiment of the present invention, wherein the horizontal axis is the pitch angle (degree), and the vertical axis is the far-field gain, which has achieved good in the range of ±50° pitch angle gain.

Fig. 7 shows an axial ratio graph of the antenna system according to an embodiment of the present invention, wherein the horizontal axis is the azimuth angle (degrees), and the vertical axis is the far field axial ratio. It can be seen that the antenna system of the embodiment of the present invention can achieve an axial ratio of less than or equal to 5 within the azimuth angle range of ±50°, achieving good circular polarization performance.

Combining the performance curves in Fig. 5 to Fig. 7, it can be known that the communication antenna in the present invention can make each radiating sheet realize dual-band linear polarization by cutting the angle of the radiating sheet. Furthermore, the first radiator and the second radiator can work in the same dual frequency band. Furthermore, in the antenna system of the present invention, by shifting the phase of the input signal entering one of the radiators by 90°, the laminated first radiator and second radiator can form circularly polarized or elliptically polarized radiation signals. Compared with the prior art that requires two sets of signal processing devices to realize dual-band circular polarization, or uses one set of signal processing devices to process two sets of signals in time-division multiplexing, the utility model reduces the volume, weight and cost.

The communication antenna of the utility model can be widely used in various fields of measurement and communication due to its advantages of low profile, light weight, small volume, easy conformal shape and mass production. The application range of the antenna system realizing the circular polarization performance in the embodiment of the utility model is wider, and can be applied to fields such as mobile communication and satellite navigation.

Although the utility model has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the utility model, without departing from the spirit of the utility model Various equivalent changes or substitutions can also be made, therefore, as long as the changes and modifications to the above embodiments are within the spirit of the present utility model, they will all fall within the scope of the claims of the present application.

Claims (26)

1. a communication antenna, is characterized in that, comprising:

First radiant body, wherein the first radiant body comprises first substrate and setting the first radiation fin on the first substrate, and the first radiation fin has the first current feed department and corner cut, and the radiating surface of the first radiation fin is convex surface; And

Second radiant body, wherein the second radiant body comprises second substrate and is arranged on the second radiation fin on second substrate, and the second radiation fin has the second current feed department and corner cut, and the radiating surface of the second radiation fin is convex surface,

Wherein the second substrate of the second radiant body is placed on the first radiation fin of the first radiant body stackedly.

2. communication antenna as claimed in claim 1, it is characterized in that, described first radiant body and described second radiant body realize two-band linear polarization respectively.

3. communication antenna as claimed in claim 2, it is characterized in that, described first radiant body and described second radiant body are operated in identical two-band.

4. communication antenna as claimed in claim 2, it is characterized in that, described first radiant body realizes different linear polarization directions from described second radiant body.

5. communication antenna as claimed in claim 1, it is characterized in that, described first radiation fin and described second radiation fin are separately for having the rectangle of corner cut.

6. communication antenna as claimed in claim 5, it is characterized in that, described first radiation fin has two corner cuts on the first diagonal, and described second radiation fin has two corner cuts on the second diagonal.

7. communication antenna as claimed in claim 6, it is characterized in that, described first diagonal of described first radiation fin and described second diagonal of described second radiation fin are at angle.

8. communication antenna as claimed in claim 7, it is characterized in that, described first diagonal of described first radiation fin is mutually vertical with described second diagonal of described second radiation fin.

9. communication antenna as claimed in claim 1, it is characterized in that, the geometric center of described first radiation fin and described second radiation fin is aligned with each other.

10. communication antenna as claimed in claim 1, it is characterized in that, described first current feed department and the second current feed department are coaxial feed portions.

11. communication antennas as claimed in claim 1, it is characterized in that, described first current feed department is arranged on the first symmetry axis of described first radiation fin, and described second current feed department is arranged on the second symmetry axis of described second radiation fin, and described first symmetry axis is different with described second symmetry axis direction.

12. communication antennas as claimed in claim 11, is characterized in that, described first symmetry axis and described second symmetry axis orthogonal.

13. communication antennas as claimed in claim 1, is characterized in that, the size of described first radiation fin is greater than the size of described second radiation fin.

14. communication antennas as claimed in claim 13, it is characterized in that, the dielectric constant of described second substrate is greater than the dielectric constant of described first substrate.

15. communication antennas as claimed in claim 1, it is characterized in that, described first radiant body and the second radiant body are placed in cavity, and wherein said cavity is in the radiation direction upper shed of described communication antenna.

16. communication antennas as claimed in claim 15, is characterized in that, described cavity is circular or square cavity.

17. communication antennas as claimed in claim 15, is characterized in that, described first radiant body and have packing material between the second radiant body and described cavity.

18. communication antennas as claimed in claim 1, is characterized in that, described first substrate and second substrate are rectangle separately.

19. communication antennas as claimed in claim 1, it is characterized in that, described first substrate and/or second substrate are made up of the dielectric substrate doped with conductive micro structures.

20. communication antennas as claimed in claim 1, is characterized in that, described first radiant body and described second radiant body are electrically insulated from each other.

21. communication antennas as claimed in claim 1, is characterized in that, also comprise:

Frequently select radome, described frequency selects radome to be arranged in the radiation direction of described communication antenna.

22. 1 kinds of antenna systems, is characterized in that, comprising:

Feed port;

Power splitter, the first end of described power splitter is connected to described feed port;

Communication antenna according to any one of claim 1 to 21, second end of wherein said power splitter is connected to described first current feed department via the first feeder line, and the 3rd end of described power splitter is connected to described second current feed department via the second feeder line, between the signal on the signal on wherein said first feeder line and described second feeder line, there is phase shift each other.

23. antenna systems as claimed in claim 22, is characterized in that, described first feeder line or described second feeder line have phase shifter.

24. antenna systems as claimed in claim 23, is characterized in that, described phase shifter is 90 ° of phase shifters.

25. antenna systems as claimed in claim 22, it is characterized in that, the length of described first feeder line and described second feeder line differs 1/4 wavelength.

26. 1 kinds of communication apparatus, is characterized in that, comprise the communication antenna according to any one of claim 1 to 21 or the antenna system according to any one of claim 22 to 25.