A new multi-frequency circularly polarized antenna

Abstract

The present invention belongs to the field of radio communications, and specifically relates to a novel multi-frequency circularly polarized antenna, comprising: an antenna and several pairs of probes, the antenna having several feed points for extracting radio signals, a first antenna radiating surface formed above one end of the probe, and an antenna reflecting surface formed below the other end of the probe, the angle of phase difference between the first phase angle and the second phase angle being 180 degrees, and two feed points corresponding to the first phase angle and the second phase angle forming the 180-degree phase difference being diagonally arranged. This invention has the advantage of reducing the use of bridges and lowering antenna phase shift loss while also ensuring the efficiency and bandwidth of the circularly polarized antenna.

Description

Technical Field

[0001] The present invention belongs to the field of radio communications, and in particular relates to a novel multi-frequency circularly polarized antenna. Background Art

[0002] At present, in the field of multi-satellite multi-frequency high-precision positioning antennas, double-layer four-feed point antennas (with a total of eight feed points) achieve circular polarization through six 3dB bridges and two 90-degree phase-shifting networks, and single-layer four-feed antennas achieve circular polarization through three 3dB bridges and one 90-degree phase-shifting network. The antenna cost is relatively high. The present invention reduces costs while improving performance, providing technological innovation for further miniaturization of the entire equipment. Summary of the Invention

[0003] The object of the present invention is to address the deficiencies of the prior art and provide a method for reducing the use of bridges and lowering antenna phase shift losses while ensuring the efficiency and bandwidth of a circularly polarized antenna.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A novel multi-frequency circularly polarized antenna comprises: an antenna and several pairs of probes, wherein the antenna is formed with several feeding points for leading out radio signals, the probes are electrically connected to the feeding points, and the number and position of the probes correspond to the position and number of the feeding points, a first antenna radiation surface is formed above one end of the probe, and an antenna reflection surface is formed below the other end of the probe, at least one pair of probes is connected to the antenna radiation surface to form a first phase angle, and at least one pair of probes is connected to the antenna reflection surface to form a second phase angle, the first phase angle and the second phase angle are 180 degrees out of phase, and the two feeding points corresponding to the first phase angle and the second phase angle with a phase difference of 180 degrees are diagonally arranged, and the antenna is also connected to a phase shifting network capable of phase-shifting the phase difference angle between the first phase angle and the second phase angle and outputting the phase.

[0006] Furthermore, the number of the probes is set to two pairs, wherein one pair of probes is connected to the antenna radiation surface, and the other pair of probes is connected to the antenna reflection surface.

[0007] Furthermore, a second antenna radiating surface is provided between the first antenna radiating surface and the antenna reflecting surface, the first antenna radiating surface is parallel to the second antenna radiating surface, and the number of the probes is set to 4 pairs, of which two pairs of probes are connected to the second antenna radiating surface, one pair is connected to the first antenna radiating surface, and the other pair is connected to the antenna reflecting surface.

[0008] Furthermore, the phase shift network can perform a 90-degree phase shift on each feeding probe in a clockwise or counterclockwise direction.

[0009] Furthermore, the probe is connected to the first antenna radiation surface, the second antenna radiation surface or the antenna reflection surface by direct connection or coupling.

[0010] Furthermore, the probe feeding mode is a reciprocal design, where one group of probes is fed from top to bottom, and the opposite probe is fed from bottom to top.

[0011] Furthermore, the phase shift network has a combiner that performs equal-phase combining and outputting the phase difference angle between the first phase angle and the second phase angle, and a 90-degree phase shift network that can perform phase shift combining and outputting the equal-phase combined output signal.

[0012] Furthermore, the phase shift network first performs a 90-degree phase shift on the two groups of feeds and then combines them for output.

[0013] Furthermore, the feeding probe forms an anti-phase by changing the feeding mode.

[0014] Furthermore, the number of the feeding probes can be adjusted according to the structure, and the number is an integer multiple of 2.

[0015] Furthermore, the feeding radiation surface can be increased according to the number of frequency points and is not limited by the feeding method.

[0016] Beneficial effects of the present invention:

[0017] By setting the positional and connection relationship between the probe and the first antenna radiating surface and the antenna reflecting surface, a reverse feeding design is adopted to form a 180-degree phase reversal compared to the traditional single-layer four-feed point antenna, thereby saving the bridge. At the same time, by utilizing the 180-degree phase difference between the first antenna radiator and the antenna reflecting surface, a wider bandwidth is achieved, the antenna phase shift loss is reduced, and the efficiency and bandwidth of the circularly polarized antenna are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attachment Figure 1 This is a schematic side view of a single-layer four-feed point structure of the present invention;

[0019] Attachment Figure 2 This is a simplified diagram of the first phase-shift network diagram of a single-layer four-feed point system of the present invention;

[0020] Attachment Figure 3 Schematic diagram of the feeding point positions of a single-layer four-feed system of the present invention;

[0021] Attachment Figure 4 This is a schematic side view of the single-layer four-feed point coupled feeding system of the present invention;

[0022] Attachment Figure 5 This is a schematic side view of a single-layer four-feed-point semi-coupled feeder according to the present invention;

[0023] Attachment Figure 6 This is a schematic side view of the double-layer four-feed point system of the present invention;

[0024] Attachment Figure 7 This is a simplified side view of a traditional single-layer four-feed point system;

[0025] Attachment Figure 8 A schematic side view of the combined feeder of the present invention;

[0026] Attachment Figure 9 This is a simplified diagram of the second phase-shifting network diagram of the single-layer four-feed point system of the present invention.

[0027] Markings in the figure: 100 - first antenna radiation surface; 200 - antenna reflection surface; 300 - probe; 401 - first feeding point, 402 - second feeding point, 403 - third feeding point, 404 - fourth feeding point, 405 - fifth feeding point, 406 - sixth feeding point, 407 - seventh feeding point, 408 - eighth feeding point; 500 - second antenna radiation surface; 601 - first reference point, 602 - second reference point. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0031] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] refer to Figures 1 to 3 According to an embodiment of the present application, a novel multi-frequency circularly polarized antenna is provided, comprising: an antenna and several pairs of probes 300, The antenna is formed with several feeding points for leading out radio signals. The probes 300 are electrically connected to the feeding points, and the number and position of the probes 300 correspond to the position and number of the feeding points. A first antenna radiation surface 100 is formed above one end of the probe 300, and an antenna reflection surface 200 is formed below the other end of the probe 300. At least one pair of probes 300 is connected to the antenna radiation surface to form a first phase angle, and at least one pair of probes 300 is connected to the antenna reflection surface 200 to form a second phase angle. The first phase angle and the second phase angle are 180 degrees out of phase, and the two feeding points corresponding to the first phase angle and the second phase angle that are 180 degrees out of phase are arranged diagonally. The antenna is also connected to a combiner that can output the phase difference angle between the first phase angle and the second phase angle in equal phase. The antenna is also connected to a phase shift network that can phase-shift and output the output signal of the equal phase combination. The phase shift network can phase-shift each feeding probe 90 degrees clockwise or counterclockwise.

[0033] As an embodiment of the present application, the number of probes 300 is set to two pairs, wherein one pair of probes 300 is connected to the antenna radiation surface, and the other pair of probes 300 is connected to the antenna reflection surface 200. For ease of understanding, in this embodiment, the feeding points corresponding to the probes 300 connected to the first antenna radiation surface 100 are defined from left to right as the first feeding point 401 and the second feeding point 402, and the feeding points corresponding to the probes 300 connected to the antenna reflection surface 200 are defined from left to right as the third feeding point 403 and the fourth feeding point 404.

[0034] The working principle of the above embodiment is as follows: before connection, the second feeding point 402 and the third feeding point 403 have a phase difference of 180 degrees, and the second feeding point 402 and the third feeding point 403 are arranged diagonally, the first feeding point 401 and the fourth feeding point 404 have a phase difference of 180 degrees, and the first feeding point 401 and the fourth feeding point 404 are arranged diagonally, at this time, the second feeding point 402 and the third feeding point 403 are first phase-combined and output to form the second reference point 602, the first feeding point 401 and the fourth feeding point 404 are then combined and output to form the second reference point 602. The four feed points 404 are combined and outputted in equal phase to form a first reference point 601. The first reference point 601 and the second reference point 602 are then phase-shifted and combined and outputted through a 90-degree phase shift network. At this point, the phases of the first reference point 601 and the second reference point 602 differ by 90 degrees. A clockwise or counterclockwise phase difference of 90 degrees is formed between the four feed points, namely the first feed point 401, the second feed point 402, the third feed point 403, and the fourth feed point 404, forming the necessary conditions for a circularly polarized antenna.

[0035] refer to Figure 6 As a second embodiment of the present application, a second antenna radiating surface 500 is further provided between the first antenna radiating surface 100 and the antenna reflecting surface 200. The first antenna radiating surface 100 and the second antenna radiating surface 500 are parallel to each other, and the number of probes 300 is set to 4 pairs, of which two pairs of probes 300 are connected to the second antenna radiating surface 500, one pair is connected to the first antenna radiating surface 100, and the other pair is connected to the antenna reflecting surface 200. For ease of understanding, in this embodiment, the feeding points corresponding to the probes 300 connected to the first antenna radiating surface 100 are defined as the first feeding point 401 and the second feeding point 402 from left to right, the feeding points corresponding to the probes 300 connected to the second antenna radiating surface 500 are defined as the third feeding point 403, the fourth feeding point 404, the fifth feeding point 405 and the sixth feeding point 406 from left to right, and the feeding points corresponding to the probes 300 connected to the antenna reflecting surface 200 are defined as the seventh feeding point 407 and the eighth feeding point 408 from left to right.

[0036] The working principle of the second embodiment is as follows: before connection, the first feeding point 401 and the sixth feeding point 406 have a phase difference of 180 degrees, and the first feeding point 401 and the sixth feeding point 406 are arranged diagonally; the second feeding point 402 and the fifth feeding point 405 have a phase difference of 180 degrees, and the second feeding point 402 and the fifth feeding point 405 are arranged diagonally; the third feeding point 403 and the eighth feeding point 408 have a phase difference of 180 degrees, and the third feeding point 403 and the eighth feeding point 408 are arranged diagonally. The eight feeding points 408 are arranged diagonally; the fourth feeding point 404 and the seventh feeding point 407 are 180 degrees out of phase, and the fourth feeding point 404 and the seventh feeding point 407 are arranged diagonally. At this time, the first feeding point 401 and the fifth feeding point 405 are output by the same phase combination to form a first reference point 601, the second feeding point 402 and the sixth feeding point 406 are output by the same phase combination to form a second reference point 602, and the third feeding point 403 and the eighth feeding point 408 are output by the same phase combination to form a second reference point 603. The third output is formed by phase-combining the fourth feed point 404 and the seventh feed point 407 to form a fourth output. The first reference point 601 and the second reference point 602 are then phase-shifted and combined through a 90-degree phase-shift network for output. The third output and the fourth output are then phase-shifted and combined through a 90-degree phase-shift network for output. At this time, the phases of the first reference point 601 and the second reference point 602 differ by 90 degrees, and the phases of the third output and the fourth output differ by 90 degrees. A clockwise or counterclockwise phase difference of 90 degrees is formed between the eight feed points: the first feed point 401, the second feed point 402, the third feed point 403, the fourth feed point 404, the fifth feed point 405, the sixth feed point 406, the seventh feed point 407, and the eighth feed point 408, meeting the necessary conditions for a circularly polarized antenna. For embodiments other than the present invention, the radiating surface may be provided with more layers, and the corresponding feed point arrangement also changes with the number of layers provided.

[0037] In the above-mentioned embodiment of the present application, the 90-degree phase-shift network is a 3dB bridge coupler. In other implementations other than this embodiment, it may also be other equivalent discrete circuits.

[0038] refer to Figure 4 and Figure 5 For the above-mentioned embodiments of the present application, the connection method between the probe 300 and the first antenna radiating surface 100, the second antenna radiating surface 500 or the antenna reflecting surface 200 is direct connection or coupling. The connection method between the probe 300 and the first antenna radiating surface 100, the second antenna radiating surface 500 or the antenna reflecting surface 200 can be set to only direct connection, only coupling, or a combination of direct connection and coupling.

[0039] In the above-mentioned embodiment of the present application, the probe feeding method is designed to be reciprocal, where one set of probes 300 is fed from top to bottom, and the opposite probe 300 is fed from bottom to top.

[0040] For the above-mentioned embodiments of the present application, the phase shift network, the combiner for performing equal-phase combining output on the phase difference angle between the first phase angle and the second phase angle, and the 90-degree phase shift network for performing phase shift combining output on the equal-phase combined output signals.

[0041] In the above-mentioned embodiment of the present application, the phase shifting network first performs a 90-degree phase shift on the two groups of feeds and then combines them for output.

[0042] In the above-mentioned embodiment of the present application, the feeding probes form an anti-phase by changing the feeding mode, and the number of feeding probes can be adjusted according to the structure, and the number is an integer multiple of 2.

[0043] For the above-mentioned embodiments of the present application, the feeding radiation surface can be increased according to the number of frequencies and is not limited by the feeding method.

[0044] like Figure 9 As shown, the phase shifting network of the present invention can also be configured such that the first feeding point 401 and the second feeding point 402 are first phase-shifted by 90 degrees through a 3dB bridge to output a third reference point 603. The third feeding point 403 and the fourth feeding point 404 are first phase-shifted by 90 degrees through a 3dB bridge to output a fourth reference point 604. The third reference point 603 and the fourth reference point 604 are then combined with equal amplitude and equal phase to output the result. This also forms a phase shifting network in which each feeding point sequentially generates a 90-degree phase difference.

[0045] The embodiment described above is only one of the more preferred specific embodiments of the present invention. Any common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel multi-frequency circularly polarized antenna, characterized in that: include: An antenna and several pairs of probes, wherein the antenna is formed with several feeding points for leading out radio signals, the probes are electrically connected to the feeding points, and the number and position of the probes correspond to the number and position of the feeding points, a first antenna radiating surface is formed above one end of the probe, and an antenna reflecting surface is formed below the other end of the probe, at least one pair of probes is connected to the first antenna radiating surface to form a first phase angle, and at least one pair of probes is connected to the antenna reflecting surface to form a second phase angle, the first phase angle and the second phase angle are 180 degrees out of phase, and the two feeding points corresponding to the first phase angle and the second phase angle with a phase difference of 180 degrees are diagonally arranged, and the antenna is also connected to a phase shifting network capable of phase-shifting and outputting the phase difference angle between the first phase angle and the second phase angle; The number of the probes is set to two pairs, one pair of probes is connected to the radiation surface of the first antenna, and the other pair of probes is connected to the reflection surface of the antenna; The phase shift network can perform 90-degree phase shift on each probe in a clockwise or counterclockwise direction.

2. The novel multi-frequency circularly polarized antenna according to claim 1, characterized in that: A second antenna radiating surface is further provided between the first antenna radiating surface and the antenna reflecting surface. The first antenna radiating surface is parallel to the second antenna radiating surface and is opposite to the second antenna radiating surface. The number of the probes is set to 4 pairs, two pairs of probes are connected to the second antenna radiating surface, one pair is connected to the first antenna radiating surface, and the other pair is connected to the antenna reflecting surface.

3. A novel multi-frequency circularly polarized antenna according to claim 1 or 2, characterized in that: The probe is connected to the first antenna radiation surface, the second antenna radiation surface or the antenna reflection surface by direct connection or coupling.

4. The novel multi-frequency circularly polarized antenna according to claim 1, characterized in that: The probe feeding mode is a reciprocal design, wherein a pair of probes is fed from top to bottom, and the opposite probe is fed from bottom to top.

5. The novel multi-frequency circularly polarized antenna according to claim 1, characterized in that: The phase shift network is a combiner that performs equal phase combining and outputting of the phase difference angle between the first phase angle and the second phase angle, and a 90-degree phase shift network that can perform phase shift combining and outputting of the equal phase combined output signals.

6. The novel multi-frequency circularly polarized antenna according to claim 1, characterized in that: The phase shift network first performs a 90-degree phase shift on the two groups of feeds and then combines them for output.

7. The novel multi-frequency circularly polarized antenna according to claim 1, characterized in that: The probe forms an anti-phase by changing the feeding mode.

8. The novel multi-frequency circularly polarized antenna according to claim 1, characterized in that: The number of the probes can be adjusted according to the structure, and the number is an integer multiple of 2.

9. The novel multi-frequency circularly polarized antenna according to claim 1, characterized in that: The radiation surface can be increased according to the number of frequency points and is not limited by the feeding method.

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