Ultra-wideband linear polarization feed source antenna

Abstract

The invention provides an ultra-wideband linear polarization feed source antenna. The ultra-wideband linear polarization feed source antenna comprises a bottom plate and an antenna assembly arranged above the bottom plate, wherein the antenna assembly comprises a feed coaxial line and two log-periodic antennas, and the two log-periodic antennas are arranged on the two sides of the feed coaxial line respectively; and the two log-periodic antennas are connected in parallel through the feed coaxial line. The problems that in an existing UWB wireless communication system, the impedance coefficient and the gain value of an ultra wide band antenna are unstable, and the beam width of the H face and the beam width of the E face are greatly different can be solved.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and more specifically, to an ultra-wideband linearly polarized feed antenna. Background Technology

[0002] With the continuous development of wireless communication technology in positioning systems in military and other fields, increasingly higher requirements have been placed on the timeliness and efficiency of information transmission and reception in communication systems. As a result, ultra-wideband technology has emerged.

[0003] In terms of transmission rate and channel capacity, UWB (Ultra Wide-Band) wireless communication systems can maintain a bandwidth of several or even tens of GHz, thereby achieving data transmission rates of hundreds or even thousands of gigabits per second. Ultra Wide-Band antennas, as a key component of UWB wireless communication systems, have wide applications in satellite communication, deep space exploration, radar, RCS (Radar Cross Section) testing, EMC (Electromagnetic Compatibility) testing, navigation, and other fields.

[0004] However, the design of existing ultra-wideband antennas still faces various challenging problems. For example, UWB wireless communication systems require ultra-wideband antennas to maintain relatively stable impedance coefficients and gain values ​​over an extremely wide operating frequency band, and to possess stable radiation patterns. Existing ultra-wideband antennas still cannot meet these requirements. Furthermore, existing ultra-wideband antennas generally use linearly polarized antennas. However, the H-plane (magnetic field radiating plane, referring to the plane containing the antenna's maximum radiation direction and magnetic field vector) of a linearly polarized antenna has a wide beamwidth, while the E-plane (electric field radiating plane, referring to the plane containing the antenna's maximum radiation direction and electric field vector) has a narrower beamwidth. The significant difference between the beamwidths of the E-plane and H-plane can easily lead to a large difference in the beamwidths of the parabolic antenna when used as a feed for a parabolic antenna. The efficiency of a parabolic antenna is affected by the energy incident on the parabolic surface by the feed antenna. When the beamwidths of the two radiating planes (E-plane and H-plane) of the feed antenna are different, it will affect the efficiency of the parabolic antenna, and consequently, the communication performance of the UWB wireless communication system.

[0005] Based on the aforementioned technical issues, there is an urgent need for an ultra-wideband antenna with stable impedance coefficient and gain value that can effectively balance the beamwidth of the E-plane and H-plane. Summary of the Invention

[0006] In view of the above problems, the purpose of this invention is to provide an ultra-wideband linearly polarized feed antenna to solve the problems of unstable impedance coefficient and gain value of ultra-wideband antennas in existing UWB wireless communication systems, as well as the large difference between the beamwidth of the H-plane and the E-plane.

[0007] The ultra-wideband linearly polarized feed antenna provided by the present invention includes a base plate and an antenna assembly disposed above the base plate; wherein, the antenna assembly includes a feed coaxial line and two log-periodic antennas, the two log-periodic antennas being disposed on both sides of the feed coaxial line; and, the two log-periodic antennas are connected in parallel through the feed coaxial line.

[0008] Alternatively, the two log-periodic antennas can be symmetrically distributed above the base plate with the feed coaxial line as the axis of symmetry.

[0009] Alternatively, the spacing between the two log-periodic antennas can decrease sequentially from bottom to top; and, The vertical cross-sections of the two log-periodic antennas and the vertical cross-section of the base plate are collectively an isosceles triangle.

[0010] Alternatively, the log-periodic antenna may include an outer arm assembly, an inner arm assembly, and a short-circuit junction; wherein, The outer arm assembly and the inner arm assembly are symmetrically distributed; and... The bottom of the outer arm assembly is connected to the inner arm assembly via the short-circuit junction.

[0011] Alternatively, the outer arm assembly may include a first gathering line and a first oscillator disposed outside the first gathering line, and the inner arm assembly may include a second gathering line and a second oscillator disposed inside the second gathering line.

[0012] Alternatively, at least two of the first oscillators are disposed outside the first connecting line, and at least two of the second oscillators are disposed inside the second connecting line; and, The number of the first oscillator and the second oscillator are the same, and they correspond one-to-one.

[0013] Alternatively, a first downward bend may be provided at the end of at least one of the first oscillators on the lowermost side of the first assembly line, and a second downward bend may be provided at the end of at least one of the second oscillators on the lowermost side of the second assembly line.

[0014] Alternatively, the coaxial cable may include a coaxial core wire and a coaxial sheath wire; wherein, The inner arm assemblies of both log-periodic antennas are electrically connected to the coaxial cable sheath wire, and the outer arm assemblies of both log-periodic antennas are electrically connected to the coaxial cable core wire.

[0015] Alternatively, a power supply connector can be provided at the top of the power supply coaxial line; wherein, The middle part of the feed connector is electrically connected to the coaxial core wire, and the two ends of the feed connector are electrically connected to the outer arm assemblies of the two log-periodic antennas, respectively.

[0016] Alternatively, the base plate can be a metal plate; and / or, A wave-absorbing material layer is provided on the upper side of the base plate.

[0017] Compared with the prior art, the ultra-wideband linearly polarized feed antenna provided by the present invention has the following advantages: by setting a feed coaxial line and log-periodic antennas on both sides of the feed coaxial line, and connecting the two log-periodic antennas in parallel using the same feed coaxial line, and cooperating with components such as a metal base plate and absorbing materials, the radiation bandwidth of the entire ultra-wideband linearly polarized feed antenna can reach 18:1; and the impedance matching in each frequency band from 1GHz to 18GHz is maintained well, and the radiation characteristics are also maintained well; in addition, the beamwidth of the E-plane and H-plane of the ultra-wideband linearly polarized feed antenna provided by the present invention is basically the same, so the efficiency of the parabolic antenna will not be affected by the energy of the feed antenna entering the parabola.

[0018] To achieve the foregoing and related objectives, one or more aspects of the invention include the features which will be described in detail below and specifically pointed out in the claims. The following description and accompanying drawings illustrate certain exemplary aspects of the invention. However, these aspects indicate only a few of the various ways in which the principles of the invention can be used. Furthermore, the invention is intended to include all such aspects and their equivalents. Attached Figure Description

[0019] Other objects and results of the invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings and the contents of the claims, and with a more complete understanding of the invention. In the drawings: Figure 1 A perspective view of an ultra-wideband linearly polarized feed antenna according to an embodiment of the present invention; Figure 2 This is a partial enlarged view of the top of an ultra-wideband linearly polarized feed antenna provided according to an embodiment of the present invention; Figure 3 This is a structural diagram of a log-periodic antenna provided according to an embodiment of the present invention; Figure 4 The simulation curve of VSWR (voltage standing wave ratio) of the ultra-wideband linearly polarized feed antenna provided according to the embodiment of the present invention in the range of 1 GHz to 3 GHz; Figure 5 The VSWR simulation curve of the ultra-wideband linearly polarized feed antenna provided according to the embodiment of the present invention in the range of 3 GHz to 9 GHz; Figure 6 The VSWR simulation curve of the ultra-wideband linearly polarized feed antenna provided according to the embodiment of the present invention in the range of 9 GHz to 18 GHz; Figure 7 This is a schematic diagram of the E-plane and H-plane directions of an ultra-wideband linearly polarized feed antenna at 18 GHz, provided according to an embodiment of the present invention.

[0020] Reference numerals: 1. Base plate; 2. Absorbing material layer; 3. Short-circuit junction; 4. First connecting line; 5. First oscillator; 6. Second oscillator; 7. Feeding coaxial line; 71. Coaxial line core wire; 72. Coaxial line sheath wire; 8. Second connecting line; 9. Feeding connector; 10. Second downward bend. Detailed Implementation

[0021] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate structural component; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0024] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be readily apparent to those skilled in the art. This application specification and embodiments are merely exemplary.

[0025] To facilitate understanding of the principle of the ultra-wideband linearly polarized feed antenna provided by this invention, before detailing the specific structure of the ultra-wideband linearly polarized feed antenna provided by this invention, a brief introduction to existing linearly polarized ultra-wideband directional antennas will be given. Currently, commonly used linearly polarized ultra-wideband directional antennas on the market include Vivaldi antennas (conical slot antennas), ridge horn antennas, log-periodic antennas, etc. However, the beamwidth of the H-plane of these linearly polarized ultra-wideband directional antennas is relatively wide, while the beamwidth of the E-plane is relatively narrow. For UWB wireless communication systems, when using these linearly polarized ultra-wideband directional antennas as feed antennas, existing solutions usually achieve cross-polarization of multiple antennas through some methods, and then form circular polarization; it is basically difficult to solve the above-mentioned technical problems using only one or two antennas.

[0026] To address this, the present invention pre-defines a method for balancing beamwidth, namely, assembling two linearly polarized antennas in the H-plane direction. However, while this method can balance the beamwidth in the H-plane and E-plane, it occupies a large space and requires separate feeding of the two antennas before merging them, resulting in significant insertion loss. Based on this, the present invention further optimizes the design by providing an ultra-wideband linearly polarized feed antenna. This scheme uses a single feed to connect two log-periodic antennas in parallel, which can both balance the beamwidth in the H-plane and E-plane and solve the problem of multiple feeds.

[0027] The specific structure of the ultra-wideband linearly polarized feed antenna provided by this invention is described in detail below.

[0028] Figure 1 The three-dimensional structure of an ultra-wideband linearly polarized feed antenna according to an embodiment of the present invention is shown. Figure 2 This diagram shows a partially enlarged top structure of an ultra-wideband linearly polarized feed antenna according to an embodiment of the present invention. Figure 3 The structure of a log-periodic antenna according to an embodiment of the present invention is shown.

[0029] Combination Figures 1 to 3As shown in the figure, the ultra-wideband linearly polarized feed antenna provided by the present invention includes a circular (preferably made of metal) base plate 1 and an antenna assembly (not shown in the figure) disposed (e.g., fixed) above the base plate 1; wherein, the antenna assembly is vertically arranged, and the antenna assembly includes a feed coaxial line 7 and two log-periodic antennas (both the feed coaxial line 7 and the log-periodic antennas are vertically arranged), the two log-periodic antennas (not shown in the figure) have identical structures and are symmetrical to each other, the two log-periodic antennas are respectively disposed on both sides of the feed coaxial line 7, and the two log-periodic antennas are arranged axially symmetrically above the base plate 1 with the feed coaxial line 7 as the axis of symmetry; and the two log-periodic antennas are connected in parallel through the feed coaxial line 7.

[0030] It should be noted that the ultra-wideband linearly polarized feed antenna provided by this invention, by using a single feeding coaxial line 7 to connect two log-periodic antennas in parallel, can achieve a radiation bandwidth of 18:1 for the entire ultra-wideband linearly polarized feed antenna using only a single feed method; and can ensure good impedance matching within the radiation bandwidth, and the beamwidths of the E-plane and H-plane of the parabolic antenna are basically the same, so that the efficiency of the parabolic antenna is not affected by the energy of the feed antenna entering the parabolic surface.

[0031] Furthermore, it should be noted that the spacing between the two log-periodic antennas in the ultra-wideband linearly polarized feed antenna provided by this invention gradually decreases from bottom to top (from the side closest to the base plate 1 from bottom to top) (i.e., the top spacing is the smallest and the bottom spacing is the largest). Through this design, the vertical cross-sections of the two log-periodic antennas and the vertical cross-section of the base plate 1 together form an isosceles triangle structure. The isosceles triangle structure has naturally strong stability, and the support points are usually very firm, thereby further improving the stability of the entire ultra-wideband linearly polarized feed antenna.

[0032] In one specific embodiment of the present invention, such as Figure 1 As shown, each log-periodic antenna can be configured to include three parts: an outer arm assembly (not marked in the figure), an inner arm assembly (not marked in the figure), and a short-circuit junction 3. The outer arm assembly and the inner arm assembly have basically the same structure and are both vertically arranged. Furthermore, the outer arm assembly and the inner arm assembly are symmetrically distributed from left to right. In order to realize the signal transmission and signal reception performance of the log-periodic antenna, the bottom (i.e., the end) of the outer arm assembly needs to be connected to the bottom (i.e., the end) of the inner arm assembly through the short-circuit junction 3 (electrical connection) to meet the electrical signal transmission required inside the log-periodic antenna.

[0033] Furthermore, such as Figure 1As shown, to realize the fabrication of the outer arm assembly, the outer arm assembly may include a first connecting line 4 and a first vibrator 5 disposed on the outer side of the first connecting line 4 (the side away from the feed coaxial line 7), and the inner arm assembly includes a second connecting line 8 and a second vibrator 6 disposed on the inner side of the second connecting line 8 (the side close to the feed coaxial line 7); wherein, the first vibrator 5 and the second vibrator 6 are both used to complete the ultra-wideband frequency radiation of the ultra-wideband linearly polarized feed antenna provided by the present invention; and, the first connecting line 4 and the second connecting line 8 are both vertically disposed above the base plate 1 and correspond to each other; the bottom (i.e., the end) of the first connecting line 4 is electrically connected to the bottom (i.e., the end) of the second connecting line 8 through the short-circuit junction 3.

[0034] It should be noted that the oscillator (e.g., the first oscillator 5 and the second oscillator 6) is the core component of the antenna. It generates electromagnetic wave radiation through alternating current, realizing the conversion between guided waves and space waves. Its typical structure includes half-wave symmetrical oscillators and dipole oscillators (selected according to actual needs). The physical dimensions of the oscillator are closely related to the operating wavelength. For example, a quarter-wavelength or half-wavelength design can improve radiation efficiency. Furthermore, the oscillator is usually made of metal, which results in problems such as heavy weight and high cost.

[0035] In actual manufacturing, to improve the ultra-wideband frequency radiation effect of the entire ultra-wideband linearly polarized feed antenna, the first element 5 is typically arranged in multiple (at least two) configurations outside the first connecting line 4. Figure 1 As shown, there are 27 of them), and the second oscillator 6 is provided with multiple (at least two, such as) inside the second collection line 8. Figure 1 As shown, there are 27 of them); and for the same log-periodic antenna, the number of the first element 5 on the first collection line 4 and the number of the second element 6 on the second collection line 8 are the same, corresponding one-to-one, and symmetrical from left to right.

[0036] In a preferred embodiment of the invention, at least one (e.g., on the lowermost side of the first set line 4) Figure 1 As shown, the ends of the three lowest-side first oscillators 5 are provided with a first downward bend (not marked in the figure), and at least one of them on the lowest side of the second convergence line 8 (such as...) Figure 1 As shown, the ends of the three lowest pairs of second oscillators 6 are provided with second downward bending portions 10; by folding the ends of the first few pairs (such as the three lowest pairs) of oscillators (including the first oscillator 5 and the second oscillator 6) to form downward bending portions (including the first downward bending portion and the second downward bending portion 10), the overall size of the ultra-wideband linearly polarized feed antenna provided by the present invention can be effectively reduced without affecting the radiation frequency, thereby improving the integration of the ultra-wideband linearly polarized feed antenna provided by the present invention.

[0037] In one specific embodiment of the present invention, such as Figure 2 As shown, the feed coaxial line 7 extends downward from the top of the ultra-wideband linearly polarized feed antenna to the base plate 1. The feed coaxial line 7 includes a coaxial core wire 71 and a coaxial drop wire 72, which serve as two signal transmission paths for the feed coaxial line 7. The coaxial core wire 71 is located in the middle of the feed coaxial line 7 and is vertically arranged. The coaxial drop wire 72 covers the outside of the coaxial core wire 71 and is vertically arranged. In the actual connection process, at the top of the entire ultra-wideband linearly polarized feed antenna, the inner arm assemblies (preferably the second connecting line 8 in the inner arm assembly) of the two log-periodic antennas are electrically connected to the coaxial cable 72 (e.g., by lap welding to achieve electrical signal transmission), and the outer arm assemblies (preferably the first connecting line 4 in the outer arm assembly) of the two log-periodic antennas are electrically connected to the coaxial cable core line 71. Through this connection method, the inner arm assemblies and outer arm assemblies of the two log-periodic antennas can be electrically connected to the same feed coaxial cable, thereby realizing the parallel connection of the two log-periodic antennas through the same feed coaxial cable 7.

[0038] Furthermore, in order to achieve electrical connection between the outer arm assemblies (i.e., the first connecting line 4) of the two log-periodic antennas and the core line 71 of the coaxial line, a feed connector 9 can be provided at the top of the feed coaxial line 7, and the middle part (e.g., the center position) of the feed connector 9 can be electrically connected (e.g., welded) to the core line 71 of the coaxial line, and the two ends of the feed connector 9 can be electrically connected to the outer arm assemblies (preferably the first connecting line 4 in the outer arm assembly) of the two log-periodic antennas respectively.

[0039] It should be noted that, in order to achieve the ultra-wideband frequency radiation effect of the ultra-wideband linearly polarized feed antenna provided by the present invention, the base plate 1 is preferably a circular metal base plate 1, which facilitates the structural installation of the entire ultra-wideband linearly polarized feed antenna (such as subsequent welding).

[0040] Furthermore, it should be noted that the metal base plate 1 at the bottom may reflect the electromagnetic waves radiated downwards by the two log-periodic antennas back, thereby affecting the radiation pattern of the entire ultra-wideband linearly polarized feed antenna and causing antenna pattern distortion. To address this, in one specific embodiment of the present invention, at least one layer (e.g., 10 mm thick) of absorbing material 2 can be laid on the antenna metal base plate 1 to absorb the electromagnetic waves radiated downwards by the two log-periodic antennas and the electromagnetic waves reflected back by the metal base plate 1.

[0041] It should be emphasized here that the absorbing material in the absorbing material layer 2 refers to a type of material that can absorb or significantly reduce the electromagnetic wave energy received on its surface, thereby reducing electromagnetic wave interference. The absorbing material layer 2 provided by this invention uses a material that can effectively absorb electromagnetic waves in the 1-18GHz frequency band. The specific material can be flexibly selected according to the application scenario and requirements, as long as it can absorb or significantly reduce the electromagnetic wave energy received on its surface, thereby reducing electromagnetic wave interference.

[0042] The ultra-wideband linearly polarized feed antenna provided in the embodiments of the present invention, through the above structural design, enables the radiation bandwidth of the entire ultra-wideband linearly polarized feed antenna to reach 18:1; and, within the radiation bandwidth, the impedance matching is good, the voltage standing wave ratio can be <2, and the beamwidth of the radiation patterns of the E-plane and H-plane of the antenna is approximately equal and basically consistent, so that the efficiency of the parabolic antenna will not be affected by the energy of the feed antenna entering the parabolic surface.

[0043] To further demonstrate that the ultra-wideband linearly polarized feed antenna provided by this invention has good radiation characteristics and impedance matching in all frequency bands; Figure 4 The simulated VSWR (Voltage Standing Wave Ratio) curves of the ultra-wideband linearly polarized feed antenna provided according to an embodiment of the present invention are shown in the range of 1 GHz to 3 GHz. Figure 5 The simulated VSWR curves of the ultra-wideband linearly polarized feed antenna provided according to an embodiment of the present invention are shown in the range of 3 GHz to 9 GHz. Figure 6 The simulated VSWR curves of the ultra-wideband linearly polarized feed antenna provided according to an embodiment of the present invention are shown in the range of 9 GHz to 18 GHz. Figure 7 The diagram illustrates the E-plane and H-plane orientations of the ultra-wideband linearly polarized feed antenna provided according to an embodiment of the present invention at a frequency of 18 GHz.

[0044] Combination Figures 4 to 6 The simulation results of the antenna voltage standing wave ratio show that the ultra-wideband linearly polarized feed antenna provided in this embodiment of the invention maintains good impedance matching and good radiation characteristics in all frequency bands from 1 GHz to 18 GHz; furthermore, from Figure 7 As can be seen from the 18GHz E-plane and H-plane radiation patterns, the main lobes of both radiation patterns of the ultra-wideband linearly polarized feed antenna provided in this embodiment of the invention are full, the 3dB beamwidth is basically the same, the radiation characteristics are good, and the efficiency of the parabolic antenna will not be affected by the energy of the feed antenna entering the parabolic surface.

[0045] As can be seen from the above specific embodiments, the ultra-wideband linearly polarized feed antenna provided by the present invention has at least the following advantages: 1. By setting up a feed coaxial line and log-periodic antennas on both sides of the feed coaxial line, and connecting the two log-periodic antennas in parallel using the same feed coaxial line, along with components such as a metal base plate and absorbing materials, the radiation bandwidth of the entire ultra-wideband linearly polarized feed antenna can reach 18:1. 2. The ultra-wideband linearly polarized feed antenna provided by this invention maintains good impedance matching and good radiation characteristics in all frequency bands from 1 GHz to 18 GHz. 3. The beamwidths of the E-plane and H-plane of the ultra-wideband linearly polarized feed antenna provided by this invention are basically the same, so that the efficiency of the parabolic antenna will not be affected by the energy of the feed antenna entering the parabolic surface. 4. By setting up a layer of absorbing material, the electromagnetic waves radiated downwards by the two log-periodic antennas and the electromagnetic waves reflected back by the metal base plate can be absorbed, thereby effectively avoiding antenna pattern distortion. 5. By using a circular metal base plate, not only can the ultra-wideband frequency radiation effect of the ultra-wideband linearly polarized feed antenna provided by this invention be achieved, but the structural installation of the entire ultra-wideband linearly polarized feed antenna is also facilitated. 6. By using a single feed coaxial line to connect two log-periodic antennas in parallel, the radiation bandwidth of the entire ultra-wideband linearly polarized feed antenna can reach 18:1 using only a single feed, avoiding large insertion losses.

[0046] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, apparatus, article, or method. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, apparatus, article, or method that includes that element.

[0047] As per the above reference Figures 1 to 7 An ultra-wideband linearly polarized feed antenna according to the present invention is described by way of example. However, those skilled in the art will understand that various modifications can be made to the ultra-wideband linearly polarized feed antenna proposed in the present invention without departing from the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the contents of the appended claims.

Claims

1. An ultra-wideband linearly polarized feed antenna, characterized in that, The device includes a base plate and an antenna assembly disposed above the base plate; wherein the antenna assembly includes a feed coaxial line and two log-periodic antennas, the two log-periodic antennas being disposed on both sides of the feed coaxial line; and the two log-periodic antennas being connected in parallel through the feed coaxial line.

2. The ultra-wideband linearly polarized feed antenna as described in claim 1, characterized in that, The two log-periodic antennas are symmetrically distributed above the base plate with the feed coaxial line as the axis of symmetry.

3. The ultra-wideband linearly polarized feed antenna as described in claim 2, characterized in that, The spacing between the two log-periodic antennas decreases sequentially from bottom to top; and, The vertical cross-sections of the two log-periodic antennas and the vertical cross-section of the base plate are collectively an isosceles triangle.

4. The ultra-wideband linearly polarized feed antenna as described in claim 3, characterized in that, The log-periodic antenna includes an outer arm assembly, an inner arm assembly, and a short-circuit junction; wherein... The outer arm assembly and the inner arm assembly are symmetrically distributed; and... The bottom of the outer arm assembly is connected to the inner arm assembly via the short-circuit junction.

5. The ultra-wideband linearly polarized feed antenna as described in claim 4, characterized in that, The outer arm assembly includes a first connecting line and a first oscillator disposed outside the first connecting line, and the inner arm assembly includes a second connecting line and a second oscillator disposed inside the second connecting line.

6. The ultra-wideband linearly polarized feed antenna as described in claim 5, characterized in that, At least two first oscillators are disposed outside the first convergence line, and at least two second oscillators are disposed inside the second convergence line; and... The number of the first oscillator and the second oscillator are the same, and they correspond one-to-one.

7. The ultra-wideband linearly polarized feed antenna as described in claim 6, characterized in that, A first downward bend is provided at the end of at least one first oscillator located at the lowest side of the first assembly line, and a second downward bend is provided at the end of at least one second oscillator located at the lowest side of the second assembly line.

8. The ultra-wideband linearly polarized feed antenna as described in claim 7, characterized in that, The power supply coaxial cable includes a coaxial cable core wire and a coaxial cable sheath wire; wherein... The inner arm assemblies of both log-periodic antennas are electrically connected to the coaxial cable sheath wire, and the outer arm assemblies of both log-periodic antennas are electrically connected to the coaxial cable core wire.

9. The ultra-wideband linearly polarized feed antenna as described in claim 8, characterized in that, A power supply connector is provided at the top of the power supply coaxial line; wherein, The middle part of the feed connector is electrically connected to the coaxial core wire, and the two ends of the feed connector are electrically connected to the outer arm assemblies of the two log-periodic antennas, respectively.

10. The ultra-wideband linearly polarized feed antenna as described in any one of claims 1 to 9, characterized in that, The base plate is a metal plate; and / or, A wave-absorbing material layer is provided on the upper side of the base plate.

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