WO2016119714A1

WO2016119714A1 - Communication antenna, antenna system and communication device

Info

Publication number: WO2016119714A1
Application number: PCT/CN2016/072510
Authority: WO
Inventors: 刘若鹏; 陈江波
Original assignee: 深圳光启高等理工研究院
Priority date: 2015-01-30
Filing date: 2016-01-28
Publication date: 2016-08-04

Abstract

The present invention relates to a communication antenna, an antenna system containing the antenna, and a communication device containing the antenna. The communication antenna comprises: a first radiator, the first radiator comprising a first substrate and a first radiation sheet disposed on the first substrate, and the first radiation sheet having a first feed portion and a third feed portion; and a second radiator, the second radiator comprising a second substrate and a second radiation sheet disposed on the second substrate, and the second radiation sheet having a second feed portion and a fourth feed portion, wherein a radiation surface of the first radiation sheet and a radiation surface of the second radiation sheet are both curved surfaces, the first radiation sheet and the second radiation sheet each have a tangent angle, and the second radiator and the first radiator are stacked.

Description

Specification Name of Invention: Communication Antenna, Antenna System and Communication Equipment Technical Field

[0001] The present invention relates to an antenna, and more particularly to a communication antenna, and an antenna system and a communication device using the same.

Background technique

[0002] Antennas are an integral part of wireless communication systems for transmitting and receiving 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 field of antenna technology is becoming more and more extensive. In many special applications, the requirements for antenna performance are also increasing. In modern communications, as the integration of communication systems increases, the required antennas are characterized by high gain, wide band or multi-band, circular polarization, miniaturization, and wide coverage. technical problem

[0003] In the prior art, when a multi-band (for example, dual-band) antenna or a multi-band circularly polarized antenna is required, different frequency bands are usually implemented by using multiple ports and multiple antennas. In this case, multiple sets of signal processing devices are typically required to process different antenna signals, or multiple sets of signals can be processed in a multiplexed manner using a set of signal processing devices. Therefore, the multi-band antenna in the prior art has disadvantages such as a large number of antennas, a complicated structure, a large size, and poor polarization and gain performance.

[0004] In addition, in some application scenarios, it is desirable for the antenna to have improved axial ratio and pattern performance due to poor large-angle axial ratio and laterality of the antenna in a large-area metal environment.

Problem solution

Technical solution

The technical problem to be solved by the present invention is to provide a dual band communication antenna, and further to provide a circularly polarized dual band antenna system.

To this end, the present invention provides a communication antenna, an antenna system including the antenna, and a communication device including the antenna.

The communication antenna provided by the present invention includes: a first radiator, wherein the first radiator includes a first substrate and a first radiation piece disposed on the first substrate, the first radiation piece has a first power feeding portion and Third feeding portion; And a second radiator, wherein the second radiator includes a second substrate and a second radiation sheet disposed on the second substrate, the second radiation sheet having a second power feeding portion and a fourth power feeding portion, wherein the first radiation portion The radiating surface of the sheet and the radiating surface of the second radiating sheet are both convex surfaces, and the first radiating sheet and the second radiating sheet each have a chamfered corner, and the second radiating body is placed in a laminated manner with the first radiating body.

According to an aspect of the invention, the first radiator and the second radiator respectively achieve dual band line polarization.

According to an aspect of the invention, the first radiator and the second radiator operate in the same dual band

[0010] According to an aspect of the invention, the first radiator and the second radiator achieve different linear polarization directions.

[0011] According to an aspect of the invention, the first radiator is coincident with a geometric center of the second radiator.

[0012] According to an aspect of the invention, the first radiation piece and the second radiation piece are each a rectangular shape having a chamfered angle

[0013] According to an aspect of the invention, the first radiating sheet has two chamfers on a first diagonal and the second radiating strip has two chamfers on a second diagonal.

[0014] According to an aspect of the invention, the first diagonal of the first radiating sheet is at an angle to the second diagonal of the second radiating sheet.

[0015] According to an aspect of the invention, the first diagonal of the first radiating sheet and the second diagonal of the second radiating sheet are perpendicular to each other.

[0016] According to an aspect of the invention, the first power feeding unit, the second power feeding unit, the third power feeding unit, and the fourth power feeding unit are coaxial power feeding units.

[0017] According to an aspect of the invention, the size of the first radiating sheet is larger than the size of the second radiating sheet.

[0018] According to an aspect of the invention, the dielectric constant of the second substrate is greater than the dielectric constant of the first substrate.

[0019] According to an aspect of the invention, the first radiator and the second radiator are placed in a cavity.

[0020] According to an aspect of the invention, the cavity is a circular cavity or a rectangular cavity.

[0021] According to an aspect of the invention, a filling material is provided between the first radiator and the second radiator and the cavity.

[0022] According to an aspect of the invention, the first substrate and the second substrate are each rectangular. [0023] According to an aspect of the invention, the first substrate and the second substrate are made of a dielectric substrate having a conductive microstructure.

[0024] According to an aspect of the invention, the first radiator and the second radiator are electrically insulated from each other.

[0025] According to an aspect of the invention, the first power feeding portion and the third power feeding portion are disposed on a first symmetry axis of the first radiation piece, and the second power feeding portion and the The third feeding portion is disposed on a second symmetry axis of the second radiation piece, and the first symmetry axis and the second symmetry axis are perpendicular.

[0026] According to an aspect of the invention, the first power feeding portion and the third power feeding portion are located on a horizontal symmetry axis of the first radiation piece and are centrally symmetrical, and the second power feeding portion and the The fourth feeding portion is located on a vertical symmetry axis of the second radiation piece and is centrally symmetrical.

[0027] According to an aspect of the invention, the first radiation sheet is disposed on the first substrate, the second radiation sheet is disposed on the second substrate, and the second substrate is disposed on the On the first radiation sheet.

[0028] According to an aspect of the invention, there is further provided a frequency selective radome, the frequency selective radome being disposed in a radiation direction of the communication antenna.

[0029] The antenna system provided by the present invention includes: a power feeding port; a power splitter, a first input end of the power splitter being connected to the power feeding port; and the method according to any one of claims 1 to 21 The communication antenna, wherein the power splitter is a four-power splitter, and the first output end of the power splitter is connected to the second power feeder through a first feed line, the power split The second output of the device is connected to the first feed through a second feed line, the third output of the splitter is connected to the fourth feed through a third feed line, and a fourth output end of the power splitter is connected to the third power feeding portion via a fourth power feeding line, wherein the first power feeding line, the second power feeding line, the third power feeding line, and the There is a phase shift between the fourth feed lines.

[0030] According to an aspect of the invention, a phase shifter is further disposed between the power splitter and the communication antenna, and the phase shifter makes the second feed line, the third feed line, and the The four feed lines are phase shifted by 90°, 180°, and 270° with respect to the first feed line, respectively.

[0031] According to an aspect of the invention, the lengths of the second feed line, the third feed line, and the fourth feed line are respectively different from the length of the first feed line 1/4, 1/2, 3/4 wavelength.

[0032] The communication device provided by the present invention includes the communication antenna as described above or the antenna system as described above.

[0033] The present invention has the following significant advantages as compared with the prior art due to the adoption of the above technical solutions: [0034] The communication antenna of the present invention employs two radiators disposed in different planes in a stacked manner, and the size and size of the communication antenna can be reduced. By providing each radiator of the antenna with a curved surface, the radiation efficiency can be improved, and the miniaturization and conformal design requirements of the special application environment can be further satisfied. For example, in the case where the radiating surfaces of the first radiating sheet and the second radiating sheet are convex, the first radiator and the second radiator (and optionally the bottom of the cavity) may be conformal convex structures, such that The communication antenna can be more compact. For example, in the case where the radiating surfaces of the first radiating sheet and the second radiating sheet are concave, the first radiator and the second radiator (and optionally the bottom of the cavity) may be conformal concave structures, such that the communication The antenna can be more compact.

[0035] The communication antenna of the present invention can achieve dual-band linear polarization for each of the radiation sheets by chamfering the radiation sheets. Furthermore, the first radiator and the second radiator can operate in the same dual frequency band. By setting the linear polarization directions of the first radiation piece and the second radiation piece, a communication antenna can be used to realize the dual-line polarization dual frequency band.

[0036] Further, the antenna system of the present invention stacks the first radiator by setting the relative positions of the two radiators and the phase shift between the excitation signals fed to the four feeding portions disposed on the two radiators. And the second radiator is capable of forming a circularly or elliptically polarized radiation signal. Compared with the prior art, two sets of signal processing devices are required to realize dual-band circular polarization, or a set of signal processing devices are used to process two sets of signals in a multiplexed manner, the invention reduces the size, weight and antenna system of the antenna system. cost. In addition, by the four feeds provided on the two radiators, it is also possible to optimize the large-angle axial ratio of the antenna and improve the out-of-roundness of the pattern. Advantageous effects of the invention

Beneficial effect

[0037] In summary, the communication antenna of the present invention has the advantages of low profile, light weight, small size, easy conformalization, and mass production, and can realize dual-band linear polarization or even further realize dual-band circular polarization. Optimizing the antenna's large-angle axial ratio and improving the non-circularity of the pattern can be widely used in various fields of measurement and communication.

Brief description of the drawing

DRAWINGS

The above described objects, features, and advantages of the present invention will become more apparent from the aspects of the invention. 1A is a schematic perspective structural view of a communication antenna according to an embodiment of the invention; [0039] FIG.

1B is a schematic perspective structural view of a communication antenna according to another embodiment of the present invention;

2 shows a plan view of an exemplary communication antenna structure in accordance with an embodiment of the present invention;

3A shows a plan view of an exemplary communication antenna structure with an optional cavity and frequency selective radome, in accordance with an embodiment of the present invention;

3B shows a plan view of another exemplary communication antenna structure with an optional cavity and frequency selective radome in accordance with an embodiment of the present invention; [0043] FIG.

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

5A is a graph showing a voltage standing wave ratio of a communication antenna according to an embodiment of the present invention; [0045] FIG.

5B is a graph showing a voltage standing wave ratio of an antenna system according to an embodiment of the present invention; [0046] FIG.

6A is a diagram showing a gain curve of an antenna system according to an embodiment of the present invention; [0047] FIG.

6B is a graph showing a gain curve of an antenna system according to another embodiment of the present invention; [0048] FIG.

7A is a graph showing an axial ratio of an antenna system according to an embodiment of the present invention; [0049] FIG.

7B is a graph showing an axial ratio of an antenna system according to another embodiment of the present invention.

Embodiments of the invention

The invention will be further described in conjunction with the specific embodiments and the accompanying drawings, in which FIG. For the implementation, a person skilled in the art can make similar promotion and deduction according to the actual application without departing from the connotation of the present invention. Therefore, the scope of the present invention should not be limited by the content of the specific embodiment.

1A and 1B are schematic perspective structural views showing a schematic diagram of a microstrip communication antenna according to a preferred embodiment of the present invention. 2 shows a plan view of an exemplary communication antenna structure in accordance with an embodiment of the present invention. Referring to FIG. 1A, FIG. 1B and FIG. 2, the communication antenna 200 of the present embodiment is composed of a first radiator 201 and a second radiator 202, wherein the first radiator 201 includes a first substrate 21 and a first radiation sheet 22. The second radiator includes a second substrate 23 and a second radiation sheet 24. The first radiator 201 and the second radiator 202 are disposed on different mounting surfaces. For example, the first radiator 201 and the second radiator 202 may be placed in a stacked manner. Specifically, the first radiation sheet 22 may be disposed on the first substrate 21, and the second radiation sheet 24 may be disposed on the second substrate 23. And the second substrate 23 is disposed on the first radiation sheet 22, in such a manner as to form a laminated structure. Preferably, the first radiator 201 coincides with the geometric center of the second radiator 202. The laminated structure makes it possible to streamline the design structure, simplify the manufacturing process and save space, and achieve further miniaturization.

[0053] The substrate is made of a dielectric substrate that is miscellaneous with a conductive microstructure. The radiation sheet is made of a conductive material, for example, made of metal. The radiation sheet may be in the form of a patch or a photolithographically etched coating. The geometry of the first radiating sheet 24 is not limited, and is exemplified as a square in the present embodiment, and may alternatively be a rectangle or other shape. The geometry of the second radiating sheet 24 is also not limited, but is generally selected to be identical to the first radiating sheet 22 (including the same and symmetric conditions).

[0054] The first radiation sheet 22 has a first power feeding portion 25 and a third power feeding portion 27, and the second radiation sheet 24 has a second power feeding portion 26 and a fourth power feeding portion 28. The first power feeding unit 25, the third power feeding unit 27, the second power feeding unit 26, and the fourth power feeding unit 28 may respectively input signals to be transmitted or output received signals. Preferably, the first power feeding unit 25, the third power feeding unit 27, the second power feeding unit 26, and the fourth power feeding unit 28 may be coaxial power feeding units. The coaxial feed mode reduces the interference of the feed structure. The first power feeding portion 25 and the third power feeding portion 27 are disposed on a first symmetry axis of the first radiation piece, and the second power feeding portion 26 and the fourth power feeding portion 28 are disposed on a second symmetry axis of the second radiation piece Upper, the first axis of symmetry and the second axis of symmetry are perpendicular. For example, the first power feeding portion 25 and the third power feeding portion 27 are located on the horizontal symmetry axis XI or the vertical symmetry axis Y1 of the first radiation piece 22. The second power feeding portion 26 and the fourth power feeding portion 28 are located on the horizontal symmetry axis X2 or the vertical symmetry axis Y2 of the second radiation piece 24. Referring to FIG. 2, for the sake of simplicity, the first power feeding portion 25 and the third power feeding portion 27 are located on the horizontal symmetry axis XI of the first radiation piece 22 and are centrally symmetrical, and the second power feeding portion 26 and the fourth power feeding portion The electric portion 28 is located on the vertical symmetry axis Y2 of the second radiating sheet 24 and is centrally symmetrical. It should be noted that the positions of the four power feeding portions 25, 26, 27, and 28 shown in the drawing are schematic, and the embodiment of the present invention does not limit the first power feeding portion 25 and the third power feeding portion 27 and The relative positions of the two feeding portions 26 and the fourth feeding portion 28 on the horizontal plane (the paper surface in FIG. 2) are as long as the first feeding portion 25, the third feeding portion 27, and the second feeding portion are engineeringly The 26 and fourth power feeders 28 can each draw a transmission line (not shown). Further, the embodiment of the present invention does not limit the first power feeding portion 25 and the third power feeding portion 27 and the second power feeding portion 26 and the fourth power feeding portion 28 in the first radiation sheet 22 and the second radiation sheet 24, respectively. Central location. The present invention also contemplates that the mutual positional relationship of the first power feeding portion 25 and the third power feeding portion 27 and the second power feeding portion 26 and the fourth power feeding portion 28 on the radiation sheet thereof may be changed, that is, the first power feeding portion The line connecting the portion 25 and the third feeding portion 27 may be offset from the center of the first radiation piece 22, and the second feed The line connecting the electric portion 26 to the fourth feeding portion 28 may be offset from the center of the second radiating sheet 24. In addition, the present invention also contemplates that the four feeders are not in relative position but can be offset overall.

As shown in FIGS. 1A, 1B, and 2, preferably, the size of the first radiation sheet 22 is larger than the size of the second radiation sheet 24. 2 shows an example in which the size of the first radiation piece 22 is larger than the size of the second radiation piece 24 so that the second radiation piece 24 does not block the first radiation piece 22. Further, preferably, the material of the second substrate 23 has a dielectric constant greater than that of the first substrate 21. The size of the first radiating sheet 22 is made larger than that of the second radiating sheet 24 and the dielectric constant of the second substrate 23 is larger than the dielectric constant of the first substrate 21.

[0056] Each of the first radiating sheet 22 and the second radiating sheet 24 may have a chamfer angle, i.e., cut off some/some of the corners or portions of the material of the radiating sheet. By controlling the geometry of the chamfer (the size of the chamfer, the position, the angle of resection, etc.), the first radiating strip and the second radiating strip are each dual-band linearly polarized, and the frequency band position of the dual band can be controlled. In one embodiment, the first radiating sheet 22 and the second radiating sheet 24 are rectangular radiating sheets each having a hexagonal shape after cutting off two diagonals on one diagonal. For example, the first radiating sheet 22 has chamfers 22a and 22b on both sides of the first diagonal A. Similarly, the second radiating sheet 24 has cut corners 24a and 24b on both sides of the second diagonal B. In a preferred embodiment, preferably, the angles of the respective chamfers 22a, 22b, 24a and 24b are selected between 35 and 55 degrees. More preferably, the angles of the respective chamfers 22a, 22b, 24a and 24b are 45 degrees. It can be understood that the chamfer angle can also be other angles. Preferably, all of the chamfers 22a, 22b, 24a and 24b have the same shape.

[0057] When the excitation enthalpy is applied through the feed port, each of the first radiator 201 and the second radiator 202 operates as a linearly polarized ray element. According to an embodiment of the invention, the first radiator 201 and the second radiator 202 are placed such that the first diagonal A and the second diagonal B are at an angle. Preferably, the first radiator 201 and the second radiator 202 are placed such that the first diagonal A and the second diagonal B are orthogonal to each other. It will be understood that in other embodiments of the invention, the two chamfers of each of the first radiating sheet 22 and the second radiating sheet 24 may not be on the diagonal. By controlling the chamfer angles of the first radiating sheet 22 and the second radiating sheet 24, each of the first radiator 201 and the second radiator 202 can transmit/receive a dual-band linearly polarized signal, and the first radiator 201 and the second radiation Body 202 can operate in the same dual band. Since the first diagonal A and the second diagonal B are at an angle, the linearly polarized signals of the first radiator 201 and the second radiator 202 can form an elliptical polarization or a circular pole in a phase shift with each other. Radiation signal. In particular, when the first diagonal A and the second B perpendicular to the chamfer are perpendicular, the two linear polarizations can be made perpendicular to each other, that is, one is horizontally polarized and one is vertically polarized. , thereby forming a good circularly polarized radiation signal.

[0058] Further, through the feed network, there is a 90° phase shift between the four excitation signals fed to the four feeds. For example, the excitation signal of the second power feeding portion 26 fed to the second radiator 202 is a reference 0° phase, and the first power feeding portion 25 has a phase shift of 90° with respect to the second power feeding portion 26, and fourth. The power feeding unit 28 has 180 with respect to the second power feeding unit 26. With the phase shift, the third power feeder 27 has 270 with respect to the second power feeder 26. Phase shift. When the excitation enthalpy is applied through the feeding portion, each of the first radiator 201 and the second radiator 202 operates as a linearly polarized ray element. In order to implement a circularly polarized communication antenna, the first radiator 201 and the second radiator 202 are placed such that the first diagonal A and the second diagonal B are orthogonal to each other, in accordance with an embodiment of the present invention. Such an arrangement is such that the linearly polarized waves emitted by the first radiator 201 and the second radiator 202 are orthogonal to each other, for example, the first radiator 201 emits a horizontally polarized wave, and the second radiator 202 emits a vertically polarized wave, and vice versa. Also. Further, by the feed network, there is a phase shift of 90° or 270° between the excitation signal fed to the first radiator 201 and the excitation signal fed to the second radiator 202, which causes the first radiator 201 and the first The linearly polarized waves emitted by the two radiators 202 are out of phase with each other by 90°. The first radiator 201 and the second radiator 202 emit equal amplitudes and phase differences of 90°, and linearly polarized waves which are spatially orthogonal to each other are combined into circularly polarized waves.

[0059] In the exemplary embodiment of FIGS. 1A, 1B, and 2, the first radiator 201 and the second radiator are realized in a manner in which the first diagonal A and the second diagonal B are orthogonal to each other. The linearly polarized waves of 202 are orthogonal to each other. However, it will be understood by those skilled in the art that depending on the specific geometry of the radiation sheets 22 and 24, different placements may be employed as long as the first radiator 201 and the second radiator 202 can emit spatially orthogonal lines. Polarized waves can be used.

[0060] In order to further increase the radiation efficiency and meet the miniaturization and conformal design requirements of a particular application environment, the first radiator 201 and the second radiator 202 may be made to have a curved surface. The embodiment of the present invention shown in FIG. 1A can make the first radiator 201 and the second radiator 202 have a convex surface. For example, the first substrate 21 and the second substrate 23 are formed to have a convex surface, and then coplanar radiation sheets 22 and 24 are disposed thereon. These structural layers are bonded together due to their similar three-dimensional shape. The embodiment of the present invention shown in FIG. 1B can make the first radiator 201 and the second radiator 202 have a concave surface. For example, the first substrate 21 and the second substrate 23 are formed to have a concave surface, and then the coplanar radiation sheets 22 and 24 are disposed thereon. These structural layers are bonded together due to their similar three-dimensional shape. Of course, in addition to the convex or concave surface, other curved shapes may be used, which may be determined according to specific application scenarios. The communication antenna 200 as described above is compact in structure, and each of the radiation sheets and the substrate can have a conformal structure, which reduces the size of the communication antenna and improves the integration. On the other hand, by providing a chamfer on the first radiating sheet 22 and the second radiating sheet 24, each radiating sheet can realize dual-band linear polarization, and the first radiating sheet 22 and the second radiating sheet 24 can be controlled as needed. The working frequency band and the linear polarization direction, so that a communication antenna 200 can be used to realize the dual-line polarization dual frequency band. In addition, by the four feeds provided on the two radiators, it is possible to optimize the large-angle axial ratio of the antenna and improve the out-of-roundness of the pattern.

3A and 3B show plan views of an exemplary communication antenna structure with an optional cavity 300 and a frequency selective radome 310, in accordance with a preferred embodiment of the present invention. As shown in FIG. 3, the communication antenna 200 described in connection with FIG. 1A or FIG. 1B can be placed in the cavity 300. The cavity 300 is gargle in the radiation direction of the communication antenna 100. The functions of the cavity 300 include, but are not limited to, supporting the communication antenna 200, protecting the communication antenna from the surrounding environment, and the effects of human operations. The shape of the cavity 300 is not limited and may be rectangular, square, or circular. The shape of the cavity 300 may or may not correspond to the shape of the first radiator and the second radiator. For example, the first radiator and the second radiator may be rectangular, and the cavity 300 is also rectangular. As another example, the first radiator and the second radiator may be rectangular, and the cavity 300 may be circular. The material of the cavity 300 is not limited, and is usually metal, but may also be a non-metallic material suitable for the implementation. In the case where the cavity 300 is a conductive material, the microstrip antenna 200 preferably does not contact the sidewall of the cavity 300. As an alternative, a filler material may be suitably disposed between the cavity 300 and the communication antenna 200 to better function as a fixing, shock absorbing, and/or supporting. For example, a foam fill material may be placed within 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 use. In one embodiment, the first radiator 201 and the second radiator 202 of the communication antenna 200 and the bottom of the cavity 300 may be conformal convex structures, so that the communication antenna can be more compact.

[0063] In an alternative embodiment, the radome 310 may be disposed in the radiation direction of the communication antenna 200. The radome 310 may be fixed to the substrate of the communication antenna 200 or, in the case of having the cavity 300, may be fixed to the cavity 300 to cover the mouth of the cavity 300. The radome 310 can be configured to conform to the communication antenna 100 and/or the cavity 300 (e.g., convex or concave) to adequately meet the requirements for miniaturization. The radome 310 can also have other shapes, such as a flat shape. The radome 310 can provide protection for the communication antenna 200 and preferably has good wave transmission performance without affecting signal radiation/reception of the communication antenna 200.

[0064] In a further embodiment, the radome 310 can be a frequency selective radome 310. Frequency selective radome 310 has Good wave transmission performance and can produce the expected electromagnetic response to control the propagation of electromagnetic waves.

4 shows a schematic diagram of an antenna system in accordance with an embodiment of the present invention. The antenna system shown in FIG. 4 includes a feed port 410 at the front end, a four-way splitter 420, a first feed line 430a, a second feed line 430b, a third feed line 430c, and a fourth feed line 430d. And the communication antenna 200 described in FIG. The feed network of the antenna system includes: a feed port 410, a split four power splitter 420, a first feed line 430a, a second feed line 430b, a third feed line 430c and a fourth feed line 430d. The first feed line 430a and the third feed line 430c are respectively fed into the second feed portion 26 and the fourth feed portion 28, and the second feed line 430b and the fourth feed line 430d are respectively fed into the first The power feeding unit 25 and the third power feeding unit 27. There is a phase shift between the first feed line 430a, the second feed line 430b, the third feed line 430c and the fourth feed line 430d.

[0066] In one embodiment, the second feed line 430b, the third feed line 430c, and the fourth feed may be made by a phase shifter (not shown) disposed in the power splitter 420 and the communication antenna 200. The line 430d is phase-shifted by 90°, 180°, and 270° with respect to the first feed line 430a, respectively. By feeding the first feed portion 25 fed to the first radiator 201 with the phase of the excitation signal of the third feed portion 27 by 180°, feeding the second feed portion 26 and the fourth feed to the second radiator 202 The phase of the excitation signal of the electric portion 28 is 180° different, and the circular polarization operation mode of the antenna is realized. In summary, the communication antenna 200 can realize the dual-line polarization dual band by the stacked first radiator 201 and the second radiator 202. The phases of the excitation signals are respectively 90 different by feeding the second power feeding portion 26, the first power feeding portion 25, the fourth power feeding portion 28, and the third power feeding portion 27. A circularly polarized radiation signal can be formed. Therefore, the antenna system of the present invention is capable of achieving dual-band circular polarization. Furthermore, the present invention improves the large angle axis ratio and improves the pattern performance by employing four feed portions as compared with providing only one feed portion on each of the radiation sheets.

[0067] In one embodiment, the lengths of the second feed line, the third feed line, and the fourth feed line may be different from the length of the first feed line by 1/4, 1/, respectively. 2, 3/4 wavelength, the phase of the signal after transmission through these feeder lines is different.

In addition, the power splitter 420 can adopt a microstrip line power division method to save space and effectively reduce the weight of the system.

[0069] Thus, dual-band circular polarization can be realized by only one set of signal processing devices, which greatly simplifies the structure of the antenna and reduces the cost. The communication antenna or antenna system of the above embodiment of the present invention can be incorporated in a communication device to transmit/receive signals for the communication device. 5A is a graph showing a radiation voltage standing wave ratio of a communication antenna according to an embodiment of the present invention, wherein the horizontal axis is the frequency and the vertical axis is the voltage standing wave ratio (VSWR) real part. The voltage standing wave ratio shown in FIG. 5A shows that the communication antenna 200 (or one of the radiators 201 or 202) as shown in FIG. 1 can realize linear polarization dual-band radiation when receiving an excitation signal, It has a good voltage standing wave ratio in both frequency bands

5B is a graph showing a received voltage standing wave ratio of an antenna system in which the horizontal axis is the frequency and the vertical axis is the real part of the voltage standing wave ratio (VSWR), in accordance with an embodiment of the present invention. The voltage standing wave ratio shown in FIG. 5B shows the output of the communication antenna 200 (including the two antenna radiators) of the antenna system shown in FIG. 4 at the feed port 410 after the signals received by the power divider 420 are merged. The signal has a good voltage standing wave ratio over the entire operating frequency band.

6A shows a gain graph of an antenna system employing the communication antenna shown in FIG. 1A according to an embodiment of the present invention, wherein the horizontal axis is the pitch angle (degrees) and the vertical axis is the far field gain. As shown, the communication antenna achieves good gain over a range of ±50° pitch angles in accordance with an exemplary embodiment of the present invention.

6B shows a gain graph of an antenna system employing the communication antenna shown in FIG. 1B according to an embodiment of the present invention, wherein the horizontal axis is the pitch angle (degrees) and the vertical axis is the far field gain. As shown, the communication antenna achieves good gain over a range of ±75° pitch angles in accordance with an exemplary embodiment of the present invention.

7A is a graph showing an axial ratio of an antenna system employing the communication antenna shown in FIG. 1A 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 axis ratio. The axial ratio characterizes the degree of circular polarization of the antenna. As shown, the communication antenna according to an exemplary embodiment of the present invention achieves a good circular polarization performance by achieving an axial ratio of 5 or less within an azimuth angle of ±50°.

7B is a graph showing an axial ratio of an antenna system employing the communication antenna shown in FIG. 1B 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 axis ratio. The axial ratio characterizes the degree of circular polarization of the antenna. As shown, the communication antenna according to an exemplary embodiment of the present invention achieves a good circular polarization performance by achieving an axial ratio of 5 or less in an azimuth angle of ±75°.

[0076] With reference to the performance curves of FIGS. 5A to 7B, it can be seen that the communication antenna in the present invention can achieve dual-band line polarization for each of the radiation sheets by chamfering the radiation sheets. Furthermore, the first radiator and the second radiator can operate in the same dual frequency band. Further, the antenna system of the present invention can laminate the first radiator and the second radiator by shifting the excitation signals fed to the four feeding portions disposed on the two radiators by 90° to each other. It is sufficient to form a circularly polarized or elliptically polarized radiation signal. Compared with the prior art, two sets of signal processing devices are required to realize dual-band circular polarization, or a set of signal processing devices are used to process two sets of signals in a multiplexed manner, the invention reduces the size, weight and antenna system of the antenna system. cost. Furthermore, the present invention can improve the large angle axis ratio and improve the pattern performance by employing four feeders.

The communication antenna and/or antenna system of the above-described embodiments of the present invention may be incorporated in a communication device.

[0078] The communication antenna of the present invention can be widely used in various fields of measurement and communication because of its low profile, light weight, small size, easy conformalization, and mass production advantages. The communication antenna of the embodiment of the invention has a wider application range and can be applied to the fields of mobile communication, satellite navigation and the like.

The antenna provided by the present invention includes two radiators disposed in different planes in a stacked manner, and circular polarization can be realized by setting the relative positions of the two radiators and the phase shift between the four feeder lines. And dual-band, and can optimize the antenna's large-angle axial ratio and improve the non-circularity of the pattern. In addition, by providing each of the radiators with a curved shape (concave or convex), the radiation efficiency can be improved, and the miniaturization and conformal design requirements of the special application environment can be further satisfied. The laminated structure makes it possible to streamline the design structure, simplify the production process and save space for further miniaturization.

[0080] While the invention has been described with respect to the embodiments of the present invention, it will be understood by those skilled in the art It is also possible to make various equivalent changes or substitutions within the scope of the claims of the present application, as long as the changes and modifications of the above-described embodiments are within the scope of the spirit of the invention.

Claims

Claim

[Claim 1] A communication antenna, comprising:

a first radiator, wherein the first radiator includes a first substrate and a first radiation piece disposed on the first substrate, the first radiation piece has a first power feeding portion and a third power feeding portion; and a second radiator The second radiator includes a second substrate and a second radiation piece disposed on the second substrate, and the second radiation piece has a second power feeding portion and a fourth power feeding portion.

The radiation surface of the first radiation piece and the radiation surface of the second radiation piece are both curved surfaces, and the first radiation piece and the second radiation piece each have a chamfer angle, and the second radiation body and the first radiation body are stacked

[Claim 2] The communication antenna according to claim 1, wherein the radiation surface of the first radiation sheet and the radiation surface of the second radiation sheet are both convex.

[Claim 3] The communication antenna according to claim 1, wherein the radiation surface of the first radiation sheet and the radiation surface of the second radiation sheet are both concave surfaces.

[Claim 4] The communication antenna according to any one of claims 1 to 3, wherein the first radiator and the second radiator respectively achieve dual-band linear polarization.

[Claim 5] The communication antenna according to claim 4, wherein the first radiator and the second radiator operate in the same dual frequency band.

[Claim 6] The communication antenna according to claim 4, wherein the first radiator and the second radiator realize different linear polarization directions.

[Claim 7] The communication antenna according to claim 1, wherein the first radiator coincides with a geometric center of the second radiator.

[Claim 8] The communication antenna according to claim 1, wherein the first radiation piece and the second radiation piece each have a rectangular shape with a chamfered corner.

[Claim 9] The communication antenna according to claim 8, wherein the first radiating piece has two chamfers on a first diagonal, and the second radiating piece is in a second diagonal There are two chamfers on the line.

[Claim 10] The communication antenna according to claim 9, wherein the first diagonal of the first radiating piece is at an angle to the second diagonal of the second radiating piece .

[Claim 11] The communication antenna according to claim 10, wherein the first diagonal of the first radiating piece and the second diagonal of the second radiating piece are perpendicular to each other .

The microstrip communication antenna according to claim 1, wherein the first power feeding unit, the second power feeding unit, the third power feeding unit, and the fourth power feeding unit Electric part is coaxial feed

[Claim 13] The communication antenna according to claim 1, wherein the size of the first radiating piece is larger than the size of the second radiating piece.

[Claim 14] The communication antenna according to claim 13, wherein a dielectric constant of the second substrate is larger than a dielectric constant of the first substrate.

[Claim 15] The communication antenna according to claim 1, wherein the first radiator and the second radiator are placed in a cavity.

[Claim 16] The communication antenna according to claim 1, wherein the cavity is a circular cavity or a rectangular cavity.

[Claim 17] The communication antenna according to claim 16, wherein a filler material is provided between the first radiator and the second radiator and the cavity.

[Claim 18] The communication antenna according to claim 1, wherein each of the first substrate and the second substrate is rectangular.

[Claim 19] The communication antenna according to claim 1, wherein the first substrate and the second substrate are made of a dielectric substrate having a conductive microstructure.

[Claim 20] The communication antenna according to claim 1, wherein the first radiator and the second radiator are electrically insulated from each other.

[Claim 21] The communication antenna according to claim 1, wherein the first power feeding portion and the third power feeding portion are disposed on a first symmetry axis of the first radiation piece And the second feeding portion and the third feeding portion are disposed on a second symmetry axis of the second radiation piece, and the first symmetry axis and the second symmetry axis are perpendicular.

[Claim 22] The communication antenna according to claim 1, wherein the first power feeding portion and the third power feeding portion are located on a horizontal symmetry axis of the first radiation piece and are centered Symmetrically, the second feeding portion and the fourth feeding portion are located in a vertical symmetry of the second radiation piece On the axis and center symmetrical.

The communication antenna according to claim 1, wherein said first radiating sheet is disposed on said first substrate, said second radiating sheet is disposed on said second substrate, and said second substrate Provided on the first radiation sheet.

The communication antenna according to claim 1, further comprising a frequency selective radome, wherein said frequency selective radome is disposed in a radiation direction of said communication antenna.

An antenna system, comprising:

Feed port

a power splitter, the first input of the power splitter being connected to the feed port; and the communication antenna according to any one of claims 1 to 24,

Wherein, the power splitter is a four-power splitter, and the first output end of the power splitter is connected to the second power feeding part through a first feeding line, and the second output of the power splitter The end is connected to the first power feeding portion through a second feeding line, the third output end of the power splitter is connected to the fourth power feeding portion through a third feeding line, and the power splitter is fourth The output terminal is connected to the third power feeding portion through a fourth feeding line, wherein the first feeding line, the second feeding line, the third feeding line, and the fourth feeding line There is a phase shift between them. The antenna system according to claim 25, wherein a phase shifter is further disposed between the power splitter and the communication antenna, and the phase shifter causes the second feed line and the third feed The electrical line and the fourth feed line are phase shifted by 90°, 180°, and 2 70° with respect to the first feed line, respectively.

The antenna system according to claim 25, wherein a length of said second feed line, said third feed line, and said fourth feed line is longer than a length of said first feed line The difference is 1/4, 1/2, 3/4 wavelength respectively.

A communication device, comprising the communication antenna according to any one of claims 1 to 24, or the antenna system according to any one of claims 25 to 27.