Dual-frequency wide-beam circularly polarized antenna

Abstract

The utility model provides a double-frequency wide-beam circularly polarized antenna, which belongs to the technical field of signal transmission and comprises a reflecting plate and an antenna assembly arranged on the outer wall of the reflecting plate. The antenna assembly comprises four first mounting columns, eight countersunk bolts, four low-frequency antennas, four high-frequency antennas, eight contact rings, eight feed probes, four second mounting columns, four mounting bolts, four arrangement holes, four countersunk holes and four mounting holes, wherein the four arrangement holes are formed in the bottom of the outer wall of the reflecting plate. The antenna assembly remarkably realizes low profile, high bandwidth and high performance, adopts the planar inverted-F antenna units and inner and outer annular compact arrangement, combines a low mounting column and a countersunk head fixing structure, greatly reduces the vertical height, widens the application scene, and has the core of four-feed network design, realizes accurate 90-degree phase difference feed, and has the advantages of high bandwidth and high performance. Circularly polarized waves are effectively generated, and the circularly polarized axial ratio bandwidth and the standing wave bandwidth are significantly widened.

Description

Technical Field

[0001] The utility model belongs to the technical field of signal transmission, and in particular relates to a dual-bandwidth beam circularly polarized antenna. Background Art

[0002] The four-arm helical structure antenna and the common-aperture multi-band antenna in the existing technology have the defect of being too high in profile. The former has a large overall height due to its helical structure. Although the latter reduces part of the profile through integrated design, the overall height is still relatively high, which makes it difficult to meet the application scenarios with restricted height (such as portable devices and miniaturized terminals). The working bandwidth is insufficient. The four-arm helical antenna has a narrow working frequency band and cannot cover multi-band communication needs. The parasitic circular ring microstrip antenna has a narrow circular polarization axial ratio bandwidth due to the parasitic unit band limitation, which affects the signal stability. The standing wave bandwidth and axial ratio bandwidth of traditional microstrip structure antennas are both narrow, which restricts the antenna performance, structural complexity and process difficulty. The common-aperture multi-band antenna adopts a multi-layer integrated design (metal back cavity, coupling patch, etc.), which is difficult to process and assemble, resulting in increased production costs and challenges in structural reliability. The existing solutions are difficult to take into account key indicators such as low profile, wide bandwidth, and high reliability, and cannot meet the comprehensive requirements of satellite terminals for wide beam (to ensure low elevation angle communication), multi-band, and miniaturization. Utility Model Content

[0003] The purpose of the present invention is to provide a dual-bandwidth beam circularly polarized antenna, aiming to solve the problems raised by the background technology.

[0004] A dual-bandwidth circularly polarized antenna, comprising:

[0005] reflective panels;

[0006] An antenna assembly is arranged on the outer wall of the reflector, wherein: the antenna assembly includes a low-frequency antenna, a high-frequency antenna and a feeding probe, four low-frequency antennas and four high-frequency antennas are provided, and are evenly arranged on the surface of the reflector, the low-frequency antenna is arranged outside the high-frequency antenna, one end of the low-frequency antenna is connected to the reflector through a grounding column, and the other end is connected to the reflector through a first mounting column, one end of the high-frequency antenna is connected to the reflector through a grounding column, and the other end is connected to the reflector through a second mounting column, corresponding to each low-frequency antenna and high-frequency antenna. A contact ring is provided on the reflector, and each low-frequency antenna and high-frequency antenna is respectively connected to the contact ring through a feeding probe.

[0007] Furthermore, the four low-frequency antennas are arranged in a rectangular shape.

[0008] Furthermore, the four high-frequency antennas are arranged in a circle.

[0009] Furthermore, the outer wall of the reflective plate is wrapped with a protective cover.

[0010] Furthermore, the four high-frequency antennas are arc-shaped.

[0011] Furthermore, the four low-frequency antennas are in an inverted "F" shape.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] This antenna assembly effectively addresses the high profile issue of existing multi-band, wide-beam, circularly polarized antennas. By employing a planar inverted-F antenna as the basic radiating element and utilizing an inner and outer ring arrangement, the low-frequency and high-frequency antennas are tightly and securely integrated onto the reflector. This compact layout results in a very low vertical profile for the entire antenna assembly, significantly reducing installation height requirements and broadening its application scenarios. The assembly significantly extends the antenna's operating bandwidth. Key to this is its use of a four-feed network design. Through carefully arranged contact rings and feed probes, the four radiating elements are provided with excitation signals of equal amplitude and sequentially shifted 90 degrees in phase. This feeding method effectively generates circularly polarized waves and is particularly advantageous for achieving a wider circular polarization axial ratio bandwidth. Furthermore, the planar inverted-F antenna structure inherently offers excellent impedance matching, which together contribute to a wider standing wave bandwidth within the target frequency band. This wider bandwidth results in more stable antenna performance, enabling it to adapt to a wider frequency range. The antenna assembly boasts a simple, reliable structure, making it easy to manufacture and apply. The use of metal structures and standard fasteners to achieve precise positioning and secure installation of low-frequency and high-frequency antennas not only ensures the structural strength of the antennas in environments such as vibration, but also reduces the complexity and cost of production and assembly. The use of protective covers further enhances the environmental adaptability and durability of the antennas. Its miniaturization, lightweight, and high strength make it very suitable for integration into various small and medium-sized satellite communication terminal devices with limited space. The low-frequency antenna adopts a rectangular combination layout, while the high-frequency antenna adopts a circular combination layout. This inner and outer ring arrangement strategy not only optimizes space utilization and helps achieve a low profile, but also facilitates precise control of the phase of each radiating unit, ensuring the realization of wide-beam circularly polarized radiation performance, effectively meeting the needs of terminals for stable communication with low-elevation satellites. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 This is a three-dimensional diagram of the utility model after the protective cover is installed;

[0017] Figure 3 It is a partial cross-sectional view of the utility model;

[0018] Figure 4 This is a schematic diagram of the bottom structure of the utility model;

[0019] Figure 5 This is a schematic diagram of the front three-dimensional structure of the utility model;

[0020] Figure 6 is the gain pattern of the medium and high frequency antenna of the utility model;

[0021] Figure 7 This is the gain pattern of the low- and medium-frequency antenna of the utility model.

[0022] In the figure: 1. Reflector; 2. First mounting post; 3. Countersunk bolt; 4. Low-frequency antenna; 5. High-frequency antenna; 6. Contact ring; 7. Feed probe; 8. Second mounting post; 9. Mounting bolt; 101. Protective cover; 102. Layout hole; 401. Countersunk hole; 501. Mounting hole. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0026] See also Figure 1-Figure 7 , the technical solutions provided in this embodiment are as follows:

[0027] A dual-bandwidth circularly polarized antenna, comprising:

[0028] Reflector 1;

[0029] The antenna assembly is arranged on the outer wall of the reflector 1, wherein: the antenna assembly includes four first mounting posts 2, four low-frequency antennas 4, four high-frequency antennas 5, eight contact rings 6, eight feeding probes 7, four second mounting posts 8, four mounting bolts 9, four arrangement holes 102, four countersunk holes 401 and four mounting holes 501, the four arrangement holes 102 are opened at the bottom of the outer wall of the reflector 1, the bottom ends of the four first mounting posts 2 are respectively inserted into the inner walls of the arrangement holes 102, the bottom ends of the four first mounting posts 2 are connected to the reflector 1 through the arrangement holes 102 by countersunk bolts 3, and the four countersunk holes 401 are respectively opened on one side of the outer wall of the four low-frequency antennas 4 The top ends of the four first mounting columns 2 are connected to the low-frequency antenna 4 through countersunk bolts 3 passing through the countersunk holes 401. Four mounting holes 501 are respectively opened on one side of the outer wall of the high-frequency antenna 5. The four second mounting columns 8 are fixedly set at the top of the outer wall of the reflector 1. Four mounting bolts 9 respectively pass through the mounting holes 501 and are threadedly connected to the outer wall of the top ends of the second mounting columns 8. Eight contact rings 6 are embedded in the top of the outer wall of the reflector 1. One ends of the eight feeding probes 7 are respectively electrically connected to the corresponding contact rings 6. The four low-frequency antennas 4 are respectively electrically connected to the other ends of four of the feeding probes 7, and the four high-frequency antennas 5 are respectively electrically connected to the other ends of the remaining four feeding probes 7.

[0030] In a specific embodiment of the present invention, the low-frequency antenna 4 and the high-frequency antenna 5 are both composed of planar inverted F antennas. The first mounting column 2 and the second mounting column 8 are deployed to the reflector 1, and the low-frequency antenna 4 and the high-frequency antenna 5 can be preliminarily positioned. The countersunk bolts and the mounting bolts 9 are then used to complete the fixation, which can facilitate the subsequent continuous operation of the antenna. Subsequently, the contact ring 6 and the feeding probe 7 are used to complete the layout of the four-feed feeding network. The antenna arrangement adopts inner and outer rings, and the overall verticality of the antenna and the network is low, with a low-profile characteristic. The low-frequency antenna 4 and the high-frequency antenna 5 form a radiator, and under the action of the excitation port and the connector, the four radiators successively obtain the same amplitude and the phase difference is 90°.

[0031] Specifically, the four low-frequency antennas 4 are arranged in a rectangular shape.

[0032] In a specific embodiment of the present invention, the four low-frequency antennas 4 are combined into a rectangular shape, which can facilitate phase control.

[0033] Specifically, the four high-frequency antennas 5 are arranged in a circle.

[0034] In a specific embodiment of the present invention, the four high-frequency antennas 5 are combined into a circular shape, which can ensure working stability.

[0035] Specifically, the outer wall of the reflector 1 is wrapped with a protective cover 101 .

[0036] In a specific embodiment of the present invention, the outer wall of the reflector 1 is wrapped with a protective cover 101 to protect the low-frequency antenna 4 and the high-frequency antenna 5 .

[0037] Specifically, the four high-frequency antennas 5 are arranged with a raised center.

[0038] In a specific embodiment of the present invention, the four high-frequency antennas 5 are provided with a central protrusion, which can ensure staggered arrangement.

[0039] Specifically, the cross-sections of the four low-frequency antennas 4 are L-shaped, and the cross-sections of one ends of the four high-frequency antennas 5 are arc-shaped.

[0040] In a specific embodiment of the present invention, the cross-section of one end of the four high-frequency antennas 5 is arc-shaped, which can be easily and quickly deployed.

[0041] Working principle:

[0042] This antenna is mainly composed of a high-frequency antenna, a high-frequency antenna, and a feed network. The low-frequency antenna 4 and the high-frequency antenna 5 are both composed of planar inverted F antennas. The first mounting post 2 and the second mounting post 8 are deployed on the reflector 1 to initially position the low-frequency antenna 4 and the high-frequency antenna 5. The countersunk bolts and mounting bolts 9 are then used to fix them, which can facilitate the subsequent continuous operation of the antenna. The contact ring 6 and the feed probe 7 are then used to complete the layout of the four-feed feed network. The antenna arrangement adopts an inner and outer ring shape. The overall verticality of the antenna and the network is low, and it has a low profile. The low-frequency antenna 4 and the high-frequency antenna 5 form a radiator, and under the action of the excitation port and the connector, the four radiators successively obtain the same amplitude and a phase difference of 90°. The feed network using four feeds has a wider circular polarization axis ratio bandwidth.

[0043] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dual-bandwidth circularly polarized antenna, characterized in that: include, Reflector (1); An antenna assembly is provided on the outer wall of a reflector (1), wherein the antenna assembly comprises a low-frequency antenna (4), a high-frequency antenna (5) and a feeding probe (7), four low-frequency antennas (4) and four high-frequency antennas (5) are provided and are evenly arranged on the surface of the reflector (1), the low-frequency antenna (4) is provided outside the high-frequency antenna (5), one end of the low-frequency antenna (4) is connected to the reflector (1) through a grounding column, and the other end is connected to the reflector (1) through a first mounting column (2), the high-frequency antenna (5) is connected to the reflector (1) through a grounding column, and the other end is connected to the reflector (1) through a second mounting column (8), and a contact ring (6) is provided on the reflector (1) corresponding to each low-frequency antenna (4) and high-frequency antenna (5), and each low-frequency antenna (4) and high-frequency antenna (5) is connected to the contact ring (6) through a feeding probe (7).

2. The dual-bandwidth circularly polarized antenna according to claim 1, wherein: The four low-frequency antennas (4) are arranged in a rectangular shape.

3. The dual-bandwidth circularly polarized antenna according to claim 2, wherein: The four high-frequency antennas (5) are arranged in a circle.

4. The dual-bandwidth circularly polarized antenna according to claim 3, wherein: The outer wall of the reflective plate (1) is wrapped with a protective cover (101).

5. The dual-bandwidth circularly polarized antenna according to claim 4, wherein: The four high-frequency antennas (5) are arc-shaped.

6. The dual-bandwidth circularly polarized antenna according to claim 5, characterized in that: The four low-frequency antennas (4) are in an inverted "F" shape.

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