High-performance log-periodic antenna

Abstract

The utility model discloses a high-performance log-periodic antenna, which relates to the field of electronic communication and comprises a radiation oscillator. The radiation assemblies are symmetrically arranged on the two sides of the radiation oscillator, each radiation assembly comprises multiple groups of radiation arm units which are arranged at intervals in the axial direction of the radiation oscillator, and each radiation arm comprises a first radiation arm which is vertically connected with the radiation oscillator and a second radiation arm which is located at the far end of the first radiation arm and is bent towards the radiation end of the radiation oscillator; the radiation end of the radiation oscillator is provided with an array coupling end. By designing the bent second radiation arm on the radiation oscillator, the distortion of an antenna radiation pattern caused by a conformal equipment metal shell plate is greatly reduced, and meanwhile, the second radiation arm is beneficial to improving the equivalent radiation electric size of the antenna, the low-frequency working bandwidth of the antenna can be expanded, and the size miniaturization of the antenna is realized.

Description

Technical Field

[0001] The utility model relates to the field of electronic communications, in particular to a high-performance logarithmic periodic antenna. Background Art

[0002] The Log-Periodic Antenna (LPA) is a type of antenna widely used in the field of wireless communications. Its design is based on a log-periodic structure and can maintain relatively stable performance over a wide frequency range. It has a simple structure and low cost, and its performance indicators are highly consistent when produced in large quantities. Therefore, it is widely used in various electronic signal detection and wireless signal directional transmission and reception systems.

[0003] However, when the log-periodic antenna is used conformally with a communication device, the metal casing of the communication device may interfere with the radiation characteristics of the antenna, causing the antenna radiation pattern to be distorted and resulting in a decrease in the overall antenna transmission and reception performance. Utility Model Content

[0004] The present application provides a high-performance log-periodic antenna that can solve the technical problem in the prior art that when the log-periodic antenna is used conformally with the communication equipment, the metal casing of the communication equipment may interfere with the radiation characteristics of the antenna, causing the antenna radiation pattern to be distorted, resulting in a decrease in the overall antenna receiving and transmitting performance.

[0005] The present invention provides a high-performance log-periodic antenna, comprising:

[0006] Radiating oscillators; and

[0007] The radiation components are symmetrically arranged on both sides of the radiation oscillator, and the radiation components include multiple groups of radiation arm units arranged at intervals along the axial direction of the radiation oscillator. The radiation arms include a first radiation arm vertically connected to the radiation oscillator and a second radiation arm located at the far end of the first radiation arm and bent toward the radiation end of the radiation oscillator. The radiation end of the radiation oscillator is provided with an array coupling end.

[0008] In one embodiment, a plurality of groups of the radiation arm units are equidistantly arranged along the axial direction of the radiation oscillator.

[0009] In one embodiment, the lengths of the plurality of groups of radiation arm units decrease in sequence along a direction approaching the radiation end of the radiation oscillator.

[0010] In one embodiment, the second radiating arm includes at least one folded arm.

[0011] In one embodiment, when the second radiating arm includes a folded arm, an angle is formed between the second radiating arm and the first radiating arm.

[0012] In one embodiment, when the second radiating arm includes multiple folded arms, the lengths of the multiple folded arms decrease in sequence along a direction away from the first radiating arm.

[0013] In one embodiment, the included angles formed between any two adjacent folding arms are equal.

[0014] In one embodiment, the array coupling end includes a metallized through hole opened at the radiating end of the radiating element for connecting to a coupling antenna.

[0015] In one embodiment, the number of the metallized through hole is at least one.

[0016] In one embodiment, when there are multiple metallized through holes, the multiple metallized through holes are equidistantly arranged along the axial direction of the radiating element.

[0017] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0018] 1. By designing a curved second radiating arm on the radiating element, the antenna radiation pattern distortion caused by the metal shell of the equipment is greatly reduced. At the same time, the second radiating arm helps to increase the equivalent radiation electrical size of the antenna, expand the low-frequency operating bandwidth of the antenna, and achieve miniaturization of the antenna.

[0019] 2. By designing an array coupling end on the top of the radiating end of the radiating oscillator, the electromagnetic distortion and scattering in the high-frequency band is reduced at the feed point, the impedance matching performance of the antenna in the high-frequency band is improved, and the working efficiency of the antenna in the high-frequency band is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0021] Figure 1 A schematic diagram of a high-performance log-periodic antenna structure provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of a radiating arm unit and an array coupling end in a high-performance log-periodic antenna provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of parameters of a high-performance log-periodic antenna provided in an embodiment of the present application.

[0024] In the figure: 1, radiating oscillator; 2, radiating arm unit; 3, first radiating arm; 4, second radiating arm; 5, array coupling end; 501, metallized through hole. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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 creative work are within the scope of protection of this application.

[0026] First, some technical terms in this application are explained to facilitate those skilled in the art to understand this application.

[0027] Radiating element 1: A device that effectively radiates electromagnetic waves in a specific direction in space or effectively receives electromagnetic waves from a specific direction in space. Its basic structure is a center-fed linear cylindrical antenna and can be a half-wave, full-wave, or 3 / 2 wavelength linear antenna.

[0028] Radiating end: This usually refers to the part of the oscillator responsible for radiating electromagnetic waves. This part is usually a conductor of a specific length and shape. When an alternating current is carried in the conductor, it generates changing electric and magnetic fields around it, which in turn form electromagnetic waves and radiate them.

[0029] Equivalent radiated electrical size refers to the effective size of an antenna relative to the operating wavelength when radiating or receiving electromagnetic waves. It is a comprehensive reflection of the antenna's physical dimensions and its equivalent radiation or reception capabilities under the influence of electromagnetic waves. The electrical size directly affects key antenna performance indicators such as radiation efficiency, gain, and directivity.

[0030] An embodiment of the present application provides a high-performance log-periodic antenna, which can solve the technical problem in the prior art that when the log-periodic antenna is used conformally with a communication device, the metal casing of the communication device may interfere with the radiation characteristics of the antenna, causing the antenna radiation pattern to be distorted, resulting in a decrease in the overall antenna receiving and transmitting performance.

[0031] Specifically, Figure 1 A schematic diagram of a high-performance log-periodic antenna structure provided in an embodiment of the present application, Figure 2 This is a structural diagram of the radiating arm unit 2 and the array coupling end 5 in a high-performance logarithmic periodic antenna provided in an embodiment of the present application, as shown in FIG. Figure 1 、 Figure 2As shown, the log-periodic antenna in the present application includes a radiating vibrator 1 and radiating components symmetrically arranged on both sides of the radiating vibrator 1. The radiating vibrator 1 is mainly used to receive electromagnetic waves from a specific direction in space. In the present application, the radiating vibrator 1 can be threaded or linear, and there is no specific restriction in the present application. The radiating component is mainly used to effectively radiate electromagnetic waves into space or receive electromagnetic waves from space and then transmit them to the radiating vibrator 1.

[0032] Among them, the radiation component includes multiple groups of radiation arm units 2 arranged axially at intervals along the radiation vibrator 1 to form a directional radiation pattern, which helps to concentrate the electromagnetic waves in a specific direction, thereby improving the directivity of the antenna. At the same time, the symmetrically arranged radiation components can reduce the side lobes and back lobes in the antenna radiation pattern, making the main lobe more prominent and concentrated, which helps to improve the gain of the antenna and reduce interference.

[0033] Furthermore, the radiation arm unit 2 includes a first radiation arm 3 vertically connected to the radiation vibrator 1 and a second radiation arm 4 located at the far end of the first radiation arm 3 and bent toward the radiation end of the radiation vibrator 1. The radiation arm unit 2 is bent as a whole and the bending direction is toward the radiation end of the radiation vibrator 1. Through this setting, the distortion of the antenna radiation pattern caused by the metal shell of the conformal device can be greatly reduced. At the same time, the design of the bent radiation arm unit 2 also helps to enhance the directionality of the radiation vibrator 1, so that the radiation vibrator 1 can form a more obvious beam in a specific direction, thereby improving the coverage capability and anti-interference capability of the target area.

[0034] Furthermore, the radiating end of the radiating oscillator 1 is provided with an array coupling end 5. In actual operation, when a high-frequency electromagnetic signal is transmitted through the antenna, due to the high signal frequency, distortion and scattering may occur at the feed point, which will reduce the performance of the antenna. In the present application, the array coupling end 5 can form a coupled resonance with other antenna units, which can reduce signal distortion and scattering, allowing more energy to be effectively transmitted, thereby improving the antenna's operating efficiency in the high-frequency band. At the same time, the design of the array coupling end 5 can optimize the antenna's impedance matching performance in the high-frequency band, allowing the antenna to better receive and transmit high-frequency electromagnetic waves.

[0035] The logarithmic periodic antenna in this application has a port standing wave ratio of less than 2 in the frequency band of 0.53GHz to 6.5GHz, which meets the requirements of sub6G communication systems; the antenna full-band gain is greater than 6dBi, and as the frequency band increases, the antenna gain gradually increases, reaching a maximum value of 11.7dBi at 6.46GHz. Compared with conventional logarithmic periodic antennas of the same type, the antenna size is reduced by about 11%, and the bandwidth is expanded by about 10%. At the same time, when the logarithmic periodic antenna in this application is mounted on a roof with a large area of ​​metal material, it is affected by the roof shell and the main lobe of the antenna radiation is 10.2° higher than the horizontal plane, while the conventional logarithmic periodic antenna of the same type mounted on the roof has an upward angle of 23.7°; due to the reduced upward angle, the logarithmic periodic antenna in this utility model has a gain increase of about 3dB in the horizontal plane direction.

[0036] Furthermore, multiple groups of radiation arm units 2 are equidistantly arranged along the axial direction of the radiation oscillator 1, and the lengths of the radiation arm units 2 decrease in sequence along the direction close to the radiation end of the radiation oscillator 1. As the lengths of the radiation arm units 2 decrease, the radiation oscillator 1 forms a more concentrated radiation field in the direction close to the radiation end. This design helps to enhance the directional radiation capability of the radiation oscillator 1, thereby improving the gain of the radiation oscillator 1 in a specific direction. At the same time, the radiation arms that are evenly distributed and gradually change in length help to reduce the scattering and distortion of high-frequency signals at the feed point, thereby improving the signal quality component, and can also make the radiation characteristics of the linear radiation oscillator at different frequencies smoother and more stable, which helps to expand the bandwidth of the linear radiation oscillator, so that the linear radiation oscillator can maintain stable performance in a wider frequency range.

[0037] As an optional embodiment, Figure 3 A high-performance log-periodic antenna parameter diagram provided in an embodiment of the present application is shown in FIG. Figure 3 As shown in the figure, the longest and shortest lengths of the radiating arm unit 2 in the log-periodic dipole antenna are determined by the lowest and highest operating frequencies, respectively. At the same time, the basic structure of the log-periodic antenna can be determined by the scale factor τ, the spacing factor σ and the virtual vertex angle 2 α Decision, specifically:

[0038]

[0039] Among them, L i Indicates the length of the longest radiating arm unit 2, L i-1 is the length of the second longest radiation arm unit 2 adjacent to the longest radiation arm unit 2, and so on, d i The distance between the longest radiation arm unit 2 and the second longest radiation arm unit 2, d i-1 is the distance between the second longest radiation arm unit 2 and the third longest radiation arm unit 2, and so on, R iR is the distance from the longest radiating arm unit 2 to the radiating end of the radiating oscillator 1, i-1 It represents the distance from the second longest radiation arm unit 2 to the radiation end of the radiation oscillator 1, and so on.

[0040] Furthermore, the second radiating arm 4 includes at least one folded arm. When the second radiating arm 4 includes one folded arm, an angle is formed between the second radiating arm 4 and the first radiating arm 3. The number of second radiating arms 4 can be increased as appropriate according to actual usage, but is at least one section. The folded arm is integrated with the first radiating arm 3 and forms an obtuse angle.

[0041] Furthermore, when the second radiating arm 4 comprises multiple folded arms, the lengths of the folded arms decrease in descending order as they move away from the first radiating arm 3. Radiating arms of different lengths can support different resonant frequencies. Longer radiating arms are suitable for lower frequencies, while shorter radiating arms are suitable for higher frequencies. By properly arranging radiating arms of different lengths, operation in multiple frequency bands can be achieved within a single linear radiating element design.

[0042] Furthermore, the angles formed between any two adjacent folded arms are equal, and multiple folded arms are connected end to end to form a multi-bend second radiation arm 4. When the angles formed between any two adjacent folded arms are equal, the current distribution on the radiation arm will be more uniform, which helps to reduce signal distortion during propagation and improve signal quality.

[0043] Furthermore, the array coupling end 5 includes a metallized through-hole 501 opened at the radiating end of the radiating oscillator 1 for connecting to the coupling antenna. The number of the metallized through-hole 501 is at least one. When the number of the metallized through-hole 501 is multiple, the multiple metallized through-holes 501 are equidistantly arranged along the axial direction of the radiating oscillator 1. The metallized through-hole 501 can be used as a coupling point to control the degree of coupling between each oscillator through the size and position of the hole to form array coupling, thereby achieving better impedance matching and frequency response. The number of metallized through-holes 501 depends on many factors, including but not limited to the design goals of the antenna, the operating frequency range, the desired impedance matching characteristics, and the desired radiation pattern, etc., and is not specifically limited in this application.

[0044] As an optional embodiment, the length h of the coupled single metalized through-hole via 501 is 4.2 mm, which is less than one-tenth of the wavelength corresponding to the upper operating frequency limit of the log-periodic antenna. The center-to-center spacing between adjacent metalized through-hole vias 501 is preferably 8 mm, which is less than one-quarter of the wavelength corresponding to the upper operating frequency limit of the log-periodic antenna.

[0045] The logarithmic periodic antenna of the present invention has the advantages of small size, high gain, good resistance to environmental interference, and wide operating frequency band. For conventional logarithmic periodic antennas, there are problems such as large low-frequency size and susceptibility to the influence of the working environment. At the same time, since the feed point is located at the top of the antenna's working high frequency, it is easy to cause scattering of high-frequency electromagnetic signals due to impedance mismatch, resulting in a problem of reduced high-frequency working efficiency of the antenna. The present invention designs a bent second radiating arm 4 on the radiating vibrator 1, which greatly reduces the distortion of the antenna radiation pattern caused by the metal shell of the conformal device; at the same time, the second radiating arm 4 helps to improve the equivalent radiation electrical size of the antenna, can expand the low-frequency working bandwidth of the antenna, and realize the miniaturization of the antenna size. On the other hand, by designing the array coupling end 5 at the top of the radiating end of the radiating vibrator 1, the high-frequency electromagnetic distortion and scattering are reduced at the feed point, the impedance matching performance of the antenna working high-frequency band is improved, and the working efficiency of the antenna in the high-frequency band is improved.

[0046] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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 a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be 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 elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0048] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A high-performance log-periodic antenna, characterized in that: include: Radiating oscillator (1); as well as A radiation component is symmetrically arranged on both sides of the radiation vibrator (1), the radiation component comprises a plurality of radiation arm units (2) arranged at intervals along the axial direction of the radiation vibrator (1), the radiation arm comprises a first radiation arm (3) vertically connected to the radiation vibrator (1) and a second radiation arm (4) located at the far end of the first radiation arm (3) and bent toward the radiation end of the radiation vibrator (1), and the radiation end of the radiation vibrator (1) is provided with an array coupling end (5).

2. A high performance log-periodic antenna according to claim 1, characterized in that: A plurality of groups of the radiation arm units (2) are equidistantly arranged along the axial direction of the radiation oscillator (1).

3. A high performance log-periodic antenna according to claim 2, characterized in that: The lengths of the plurality of groups of radiation arm units (2) decrease in sequence along a direction approaching the radiation end of the radiation oscillator (1).

4. The high-performance log-periodic antenna according to claim 1, wherein: The second radiating arm (4) comprises at least one folded arm.

5. A high performance log-periodic antenna according to claim 4, characterized in that: When the second radiating arm (4) includes a folded arm, an angle is formed between the second radiating arm (4) and the first radiating arm (3).

6. A high performance log-periodic antenna according to claim 4, characterized in that: When the second radiating arm (4) comprises a plurality of folded arms, the lengths of the plurality of folded arms decrease in sequence along a direction away from the first radiating arm (3).

7. A high performance log-periodic antenna according to claim 6, characterized in that: The included angles formed between any two adjacent folding arms are equal.

8. The high-performance log-periodic antenna according to claim 1, wherein: The array coupling end (5) comprises a metallized through hole (501) opened at the radiation end of the radiation oscillator (1) for connecting to a coupling antenna.

9. The high-performance log-periodic antenna according to claim 8, characterized in that: The number of the metallized through hole (501) is at least one.

10. The high-performance log-periodic antenna according to claim 9, characterized in that: When there are multiple metallized through holes (501), the multiple metallized through holes (501) are equidistantly arranged along the axial direction of the radiation oscillator (1).

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