Novel short-wave antenna

Abstract

The invention relates to the technical field of medium and long distance short-wave wireless communication, and discloses a novel short-wave antenna in order to solve the problems that an existing short-wave antenna is large in erection occupied area and is in directional communication. According to the novel short-wave antenna, a log-periodic antenna is adopted, the whole antenna curtain is composed of 12 oscillators and an assembly line, and the length and the distance between every two adjacent oscillators are selected according to a log-periodic structure; the last oscillator is a reflector and is connected with the assembly line through a section of insulating tube; the penultimate oscillator is an annular oscillator and is connected with the assembly line; except the last oscillator, the other oscillators are alternately connected with the assembly line. The novel short-wave antenna has the advantages of wide frequency band, small occupied area, high gain and omnidirectional communication.

Description

Technical Field

[0001] The present application relates to the technical field of medium- and long-distance shortwave wireless communications, and more specifically, to a novel shortwave antenna. Background Art

[0002] Shortwave communication is an important means of military communication. It is widely used in long-distance communication and target detection because it can achieve long-distance transmission through ionospheric reflection. However, shortwave antenna propagation is seriously affected by ionospheric changes and multipath transmission and is extremely unstable.

[0003] Existing shortwave antennas such as fishbone antennas, diamond antennas, and fixed logarithmic periodic antennas are often used as medium- and long-distance shortwave radio systems, but they have the disadvantages of occupying a large area for installation and directional communication. In addition, the length of a symmetrical oscillator is usually half a wavelength, and the length of a monopole is 1 / 4 wavelength. When the frequency is very low, the length of the oscillator antenna is bound to be very long, which makes the installation of the antenna difficult. Therefore, the miniaturization of the antenna is very important. Summary of the invention

[0004] In order to solve the problem that the existing shortwave antenna takes up a large area and has directional communication, the present invention provides a new shortwave antenna with the advantages of wide frequency band, small area, high gain and omnidirectional communication.

[0005] To achieve the above object, according to a first aspect of the present invention, a novel shortwave antenna is provided, comprising:

[0006] Using logarithmic periodic antenna, the entire antenna curtain consists of 12 oscillators and a collection line. The length and spacing of adjacent oscillators are selected according to the logarithmic periodic structure.

[0007] The last oscillator is a reflector, which is connected to the collection line through a section of insulating tube;

[0008] The second to last oscillator is a ring oscillator, connected to the collection line;

[0009] Except for the last oscillator, the remaining oscillators are connected to the collection line alternately.

[0010] Furthermore, the second to last, third to last and fourth to last vibrators are loaded with inductance.

[0011] Furthermore, the vibrator and the collective line are both aluminum tubes.

[0012] Furthermore, the operating frequency range of the novel shortwave antenna is not less than 10 MHz and not more than 30 MHz.

[0013] Furthermore, the voltage standing wave ratio of the new shortwave antenna is not greater than 2.5.

[0014] Furthermore, the gain of the new shortwave antenna is not less than 9dBi.

[0015] Furthermore, the horizontal beam width of the new shortwave antenna is not less than 70°.

[0016] Furthermore, the antenna curtain size of the new shortwave antenna is not greater than 10m×8m.

[0017] Furthermore, the novel shortwave antenna is adapted to the shortwave transmitter.

[0018] Furthermore, the new shortwave antenna is equipped with a rotating mechanism to achieve 360° omnidirectional communication.

[0019] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0020] (1) The present invention provides a novel shortwave antenna which can effectively fill a limited space area by adopting a folded oscillator, thereby increasing the electrical length of the antenna and reducing the size of the antenna.

[0021] (2) The present invention provides a novel shortwave antenna, which can increase the electrical length of the antenna by inductively loading the second to last, third to last, and fourth to last oscillators. Compared with the method of miniaturizing the antenna by sacrificing antenna gain through resistive loading, the antenna not only reduces the size of the antenna curtain, but also has a higher antenna gain.

[0022] (3) The novel shortwave antenna provided by the present invention is a shortwave antenna with wide frequency band, small footprint and high gain. Its main performance indicators include an operating frequency range of 10 to 30 MHz; voltage standing wave ratio ≤ 2.5; gain ≥ 9 dBi; beam width (3 dB) ≥ 70°; antenna curtain size ≤ 10 m × 8 m (the spacing from the first vibrator to the last vibrator ≤ 10 m, and the length from the first vibrator to the last vibrator ≤ 8 m).

[0023] (4) The present invention provides a novel shortwave antenna that can be adapted to a shortwave transmitter to efficiently transmit shortwave radio frequency signals, and can be rotated by cooperating with a rotating mechanism, capable of omnidirectional communication, that is, 360° full range coverage, and can achieve medium and long distance communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1A schematic diagram of the structure of a novel shortwave antenna provided in an embodiment of the present application;

[0026] Figure 2 It is the schematic diagram of the logarithmic periodic dipole antenna;

[0027] Figure 3 A schematic diagram of an electrical performance simulation model of a novel shortwave antenna provided in an embodiment of the present application;

[0028] Figure 4 A voltage standing wave ratio simulation curve of a new shortwave antenna in the frequency range of 10 to 30 MHz provided in an embodiment of the present application;

[0029] Figure 5A The horizontal plane directional pattern simulation result of a novel shortwave antenna provided in an embodiment of the present application at a frequency of 10 MHz;

[0030] Figure 5B The simulation result of the vertical plane pattern of a novel shortwave antenna provided in an embodiment of the present application at a frequency of 10 MHz;

[0031] Fig. 6A The horizontal plane directional pattern simulation result of a novel shortwave antenna provided in an embodiment of the present application at a frequency of 15 MHz;

[0032] Figure 6B The simulation result of the vertical plane pattern of a novel shortwave antenna provided in an embodiment of the present application at a frequency of 15 MHz;

[0033] Fig. 7A The horizontal plane directional pattern simulation result of a novel shortwave antenna provided in an embodiment of the present application at a frequency of 20 MHz;

[0034] Figure 7B The simulation result of the vertical plane pattern of a novel shortwave antenna provided in the embodiment of the present application at a frequency of 20 MHz;

[0035] Fig. 8A The horizontal plane directional pattern simulation result of a novel shortwave antenna provided in an embodiment of the present application at a frequency of 25 MHz;

[0036] Figure 8B The simulation result of the vertical plane pattern of a novel shortwave antenna provided in the embodiment of the present application at a frequency of 25 MHz;

[0037] Fig. 9 A gain simulation curve of a new shortwave antenna in the frequency range of 10 to 30 MHz provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] like Figure 1 As shown, a new shortwave antenna is provided. The main structure of the antenna radiator adopts a logarithmic periodic antenna. The entire antenna curtain consists of 12 oscillators ( Figure 1 A short vertical line) and a collection line ( Figure 1 The vibrator and the collective line are both made of aluminum tubes.

[0040] Those skilled in the art will understand that Figure 1 The structure shown in the figure is only a block diagram of a partial structure related to the new shortwave antenna provided by the present application scheme, and does not constitute a limitation of the new shortwave antenna provided by the present application scheme. The specific new shortwave antenna may include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0041] The length and spacing of adjacent oscillators are selected according to the logarithmic periodic structure.

[0042] Logarithmic periodic antennas exist in many forms, including tooth-shaped, tooth-line and dipole types. Logarithmic periodic dipole antenna (LPDA) is the simplest, most widely used and excellent type of logarithmic periodic antenna. It is widely used in various fields such as television and communication in UHF, VHF and HF bands. Taking the dipole logarithmic periodic antenna as an example, the principle of logarithmic periodic antenna is introduced. Figure 2 As shown, the logarithmic periodic dipole antenna is composed of N+1 parallel symmetrical oscillators.

[0043] The length of the symmetrical oscillator increases along the line, while keeping the angle with the vertex constant, that is:

[0044]

[0045] Among them, α is the angle between the symmetric oscillator and the vertex, l n is the length of the nth symmetric oscillator, l n+1 is the length of the n+1th symmetrical oscillator, r n is the distance from the nth symmetric oscillator to the vertex, r n+1 is the distance from the n+1th symmetric oscillator to the vertex.

[0046] That is to say, the ratio of the length of each symmetric oscillator to the distance from the symmetric oscillator to the vertex is a constant:

[0047]

[0048] The geometric factor is defined as the ratio of the lengths of adjacent symmetric oscillators or the ratio of the distances from adjacent symmetric oscillators to the vertex:

[0049]

[0050] Because the distance d between adjacent symmetrical oscillators n =r n -r n+1 =r n (1-τ) and:

[0051]

[0052] but

[0053] In one embodiment, the last oscillator ( Figure 1 The leftmost oscillator is a reflector, which is connected to the aggregate line through a section of insulating tube as a reflector; the second to last oscillator is a ring oscillator, also called a folded oscillator, which is connected to the aggregate line; except the last oscillator, the remaining oscillators (i.e. the second to last oscillator, the third to last, the fourth to last, the eighth from the positive number, the seventh from the positive number, the sixth from the positive number, the fifth from the positive number, the fourth from the positive number, the third from the positive number, the second from the positive number, and the first from the positive number) are alternately connected to the aggregate line.

[0054] The novel shortwave antenna provided in this embodiment can effectively fill a limited space area by adopting a folded vibrator, thereby increasing the electrical length of the antenna and reducing the size of the antenna.

[0055] In one embodiment, the second to last, third to last, and fourth to last vibrators are loaded with inductance.

[0056] The new shortwave antenna provided in this embodiment can increase the electrical length of the antenna by inductively loading the second-to-last, third-to-last, and fourth-to-last oscillators. Compared with the method of using resistive loading to achieve antenna miniaturization by sacrificing antenna gain, it not only reduces the size of the antenna curtain but also has a higher antenna gain.

[0057] After testing, the main performance indicators of the new shortwave antenna are as follows:

[0058] (1) Operating frequency range: 10~30MHz;

[0059] (2) Voltage standing wave ratio ≤ 2.5;

[0060] (3) Gain ≥ 9dBi;

[0061] (4) Beam width (3dB) ≥ 70°;

[0062] (5) The size of the antenna curtain is ≤10m×8m (the distance between the first vibrator and the last vibrator is ≤10m, and the length between the first vibrator and the last vibrator is ≤8m).

[0063] The electrical performance simulation model of the new shortwave antenna was established using FEKO simulation software based on the moment method. Figure 3 As shown. The FEKO simulation software is used to simulate the electrical characteristics of the new shortwave antenna in the frequency range of 10 to 30 MHz, such as voltage standing wave ratio, radiation pattern, and gain. The simulation results show that the new shortwave antenna has a good voltage standing wave ratio and a high gain within the operating frequency range. Therefore, it can be used for medium and long-distance shortwave wireless communications. The specific simulation results are as follows.

[0064] 1. Voltage Standing Wave Ratio

[0065] The FEKO simulation software is used to simulate the voltage standing wave ratio of the new shortwave antenna in the frequency range of 10 to 30 MHz. The simulation results are as follows: Figure 4 As shown. Figure 4 It can be seen that within the frequency range of 10 to 30 MHz, the voltage standing wave ratio of the novel shortwave antenna is less than 2.5. Therefore, the novel shortwave antenna has a good voltage standing wave ratio.

[0066] 2. Direction diagram

[0067] The FEKO simulation software is used to simulate the radiation pattern of the new shortwave antenna in the frequency range of 10 to 30 MHz. The simulation results are as follows Figures 5A-8B As shown. Among them, Figure 5A , Figure 5B The horizontal and vertical plane directional pattern simulation results of the new shortwave antenna at a frequency of 10MHz are shown below. Fig. 6A , Figure 6B The horizontal and vertical directional pattern simulation results of the new shortwave antenna at a frequency of 15MHz are shown below. Fig. 7A , Figure 7B The horizontal and vertical plane directional pattern simulation results of the new shortwave antenna at a frequency of 20MHz are shown below. Fig. 8A , Figure 8B These are the simulation results of the horizontal and vertical radiation patterns of the new shortwave antenna at a frequency of 25MHz.

[0068] It can be seen from the simulation results that in the frequency range of 10 to 30 MHz, the horizontal beam width of the new shortwave antenna is not less than 70°.

[0069] 3. Gain

[0070] The gain of the new shortwave antenna in the frequency range of 10 to 30 MHz is simulated by FEKO simulation software. The simulation results are as follows: Fig. 9 As shown. Fig. 9 It can be seen that within the frequency range of 10 to 30 MHz, the gain of the new shortwave antenna is not less than 9 dBi. Therefore, the new shortwave antenna has a relatively high gain.

[0071] The new shortwave antenna optimizes the antenna structure parameters by folding the oscillator, inductive loading and reflector coupling to achieve the "miniaturization, broadband and high gain" of the antenna. Compared with the method of using resistive loading to sacrifice antenna gain to achieve antenna miniaturization, it not only reduces the size of the antenna curtain, but also has a higher antenna gain.

[0072] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0073] The above is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure cannot be limited thereto. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure here, those skilled in the art will easily think of the implementation scheme of the present disclosure. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are only regarded as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

[0074] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new shortwave antenna, characterized in that: include: Using logarithmic periodic antenna, the entire antenna curtain consists of 12 oscillators and a collection line. The length and spacing of adjacent oscillators are selected according to the logarithmic periodic structure. The last oscillator is a reflector, which is connected to the collective line through a section of insulating tube; The penultimate oscillator is a ring oscillator connected to the collective line; Except for the last vibrator, the remaining vibrators are connected to the collective line alternately.

2. The novel shortwave antenna as claimed in claim 1, characterized in that: The second to last, third to last, and fourth to last vibrators are loaded with inductance.

3. The novel shortwave antenna as claimed in claim 1, characterized in that: The vibrator and the collective line are both aluminum tubes.

4. The novel shortwave antenna as claimed in claim 1, characterized in that: The operating frequency range of the novel shortwave antenna is not less than 10 MHz and not more than 30 MHz.

5. The novel shortwave antenna as claimed in claim 1, characterized in that: The voltage standing wave ratio of the novel shortwave antenna is not greater than 2.

5.

6. The novel shortwave antenna as claimed in claim 1, characterized in that: The gain of the novel shortwave antenna is not less than 9dBi.

7. The novel shortwave antenna as claimed in claim 1, characterized in that: The horizontal plane beam width of the novel shortwave antenna is not less than 70°.

8. The novel shortwave antenna as claimed in claim 1, characterized in that: The antenna curtain size of the novel shortwave antenna is no larger than 10m×8m.

9. The novel shortwave antenna as claimed in claim 1, characterized in that: The novel shortwave antenna is adapted to a shortwave transmitter.

10. The novel shortwave antenna as claimed in claim 1, characterized in that: The novel shortwave antenna cooperates with a rotating mechanism to achieve 360° omnidirectional communication.

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