Design method and device of log-periodic dipole antenna, medium and antenna

Abstract

The invention relates to a log-periodic dipole antenna design method and device, a medium and an antenna. The design method of the log-periodic dipole antenna comprises the following steps: determining the longest oscillator length and the shortest oscillator length of each frequency band; determining a geometric factor and a spacing factor corresponding to the current frequency band according to a gain requirement based on the type of the frequency band as a working frequency band; or, taking the first geometric factor and the first spacing factor as the geometric factor and the spacing factor corresponding to the frequency band based on the fact that the type of the frequency band is a non-working frequency band; according to the longest oscillator length, the shortest oscillator length, the geometric factor and the spacing factor of the frequency band, determining the number of oscillators of the frequency band, the length of each oscillator and the spacing between adjacent oscillators; wherein the first geometric factor is smaller than the geometric factor corresponding to the adjacent working frequency band; the first spacing factor is smaller than the spacing factor corresponding to the adjacent working frequency band. According to the invention, the longitudinal size of the antenna is reduced, and the requirement for miniaturization of the antenna is met.

Description

Technical Field

[0001] The present disclosure relates to the field of antenna technology, and in particular to a design method, device, medium and antenna for a log-periodic dipole antenna. Background Art

[0002] A log-periodic antenna is a frequency-invariant antenna (the antenna's electrical characteristics, such as impedance, radiation pattern, gain, and standing wave ratio, vary periodically with the logarithm of the frequency, essentially remaining constant over a wide frequency band). To achieve these characteristics, log-periodic antennas often have a periodic structure, meaning they are scaled up or down according to an inherent scaling factor, resulting in a discrete, self-similar structure.

[0003] Log-periodic antennas have various structural forms, among which the most widely used is the log-periodic dipole antenna, which consists of symmetrical oscillators of different lengths and a collection line connecting the oscillators. The antenna is fed from one side of the shortest oscillator, and the collection line cross-feeds between adjacent oscillators. The length of adjacent oscillators and the distance between adjacent oscillators increase proportionally along the collection line.

[0004] Log-periodic dipole antennas are widely used in communications, radar, and other fields. Their performance is closely related to parameters such as the geometry factor τ and the spacing factor σ. Traditional log-periodic dipole antenna designs often use a uniform geometry factor τ and spacing factor σ, resulting in a long longitudinal distance and large overall size. Summary of the Invention

[0005] In order to solve the above technical problems, the present disclosure provides a design method, device, medium and antenna for a log-periodic dipole antenna.

[0006] In a first aspect, the present disclosure provides a design method for a log-periodic dipole antenna, comprising:

[0007] Determine the longest and shortest oscillator lengths for each frequency band;

[0008] Based on the type of the frequency band being an operating frequency band, determining a geometric factor and a spacing factor corresponding to the current frequency band according to the gain requirement; or, based on the type of the frequency band being a non-operating frequency band, using the first geometric factor and the first spacing factor as the geometric factor and spacing factor corresponding to the frequency band;

[0009] Determine the number of oscillators in the frequency band, the length of each oscillator, and the distance between adjacent oscillators based on the longest oscillator length, the shortest oscillator length, the geometric factor, and the spacing factor of the frequency band;

[0010] The first geometric factor is smaller than the geometric factor corresponding to the adjacent working frequency band; and the first spacing factor is smaller than the spacing factor corresponding to the adjacent working frequency band.

[0011] Optionally, determining the longest oscillator length and the shortest oscillator length of each frequency band includes:

[0012] Starting from the lowest frequency, the longest oscillator length of the first frequency band is determined according to the lowest operating frequency of the first frequency band, and the shortest oscillator length of the first frequency band is determined according to the highest operating frequency of the first frequency band;

[0013] The shortest oscillator length of the previous frequency band is used as the longest oscillator length of the next frequency band, and the shortest oscillator length of the next frequency band is determined according to the highest operating frequency of the next frequency band.

[0014] Optionally, determining the longest oscillator length and the shortest oscillator length of each frequency band includes:

[0015] Starting from the highest frequency, the longest oscillator length of the first frequency band is determined according to the lowest operating frequency of the first frequency band, and the shortest oscillator length of the first frequency band is determined according to the highest operating frequency of the first frequency band;

[0016] The longest oscillator length of the previous frequency band is used as the shortest oscillator length of the next frequency band, and the longest oscillator length of the next frequency band is determined according to the lowest operating frequency of the next frequency band.

[0017] Optionally, determining the number of oscillators in the frequency band, the length of each oscillator, and the spacing between adjacent oscillators based on the longest oscillator length, the shortest oscillator length, the geometric factor, and the spacing factor in the frequency band includes:

[0018] The following formula is used to determine the number of oscillators in the frequency band, the length of each oscillator, and the distance between adjacent oscillators:

[0019]

[0020] L i (n) = L i (n-1)·τ;

[0021] D i (n-1)=L i (n-2)·2σ;

[0022] Among them, N i represents the number of oscillators in the i-th frequency band, Indicates rounding up, L min (i) represents the shortest oscillator length in the i-th frequency band, L max (i) represents the longest oscillator length of the i-th frequency band, τ represents the geometric factor of the i-th frequency band; σ represents the spacing factor of the i-th frequency band, L i (n) represents the length of the nth oscillator in the i-th frequency band, L i (n-1) represents the length of the n-1th oscillator in the i-th frequency band, D i (n-1) represents L i (n) and Li (n-1) The distance between the oscillators; L i (n-2) represents the length of the n-2th oscillator in the i-th frequency band.

[0023] Optionally, if there are multiple non-working frequency bands, the higher the frequency of the non-working frequency band, the smaller the geometric factor and spacing factor corresponding to the non-working frequency band.

[0024] Optionally, it also includes:

[0025] The design of the oscillator parameters for each frequency band is completed, and the collective line parameters of the log-periodic dipole antenna are determined by simulation.

[0026] In a second aspect, the present disclosure provides a design device for a log-periodic dipole antenna, comprising:

[0027] The oscillator length determination module is used to determine the longest oscillator length and the shortest oscillator length of each frequency band;

[0028] a factor determination module for determining a geometric factor and a spacing factor corresponding to the current frequency band according to a gain requirement based on the frequency band type being an operating frequency band; or, based on the frequency band type being a non-operating frequency band, using the first geometric factor and the first spacing factor as the geometric factor and spacing factor corresponding to the frequency band;

[0029] The oscillator design module is used to determine the number of oscillators in the frequency band, the length of each oscillator, and the distance between adjacent oscillators based on the longest oscillator length, the shortest oscillator length, the geometric factor, and the spacing factor in the frequency band;

[0030] The first geometric factor is smaller than the geometric factor corresponding to the adjacent working frequency band; and the first spacing factor is smaller than the spacing factor corresponding to the adjacent working frequency band.

[0031] In a third aspect, the present disclosure provides a processor-readable storage medium, wherein the processor-readable storage medium stores a program for causing a processor to execute the method in the first aspect.

[0032] In a fourth aspect, the present disclosure provides a log-periodic dipole antenna, comprising:

[0033] Includes multiple frequency bands;

[0034] The geometric factor and spacing factor corresponding to the working frequency band are determined according to the gain requirements; the non-working frequency band corresponds to the first geometric factor and the first spacing factor;

[0035] The number of oscillators in the oscillator group of each frequency band, the length of each oscillator and the distance between adjacent oscillators are determined by the longest oscillator length, the shortest oscillator length, the geometric factor and the spacing factor of the frequency band;

[0036] The first geometric factor is smaller than the geometric factor corresponding to the adjacent working frequency band; the first spacing factor is smaller than the spacing factor corresponding to the adjacent working frequency band.

[0037] Optionally, starting from the lowest frequency, the longest vibrator length of the first frequency band is determined based on the lowest operating frequency of the frequency band, and the shortest vibrator length is determined based on the highest operating frequency of the frequency band; the longest vibrator length of the next frequency band is equal to the shortest vibrator length of the previous frequency band, and the shortest vibrator length is determined based on the highest operating frequency of the next frequency band;

[0038] Alternatively, starting from the highest frequency, the shortest oscillator length of the first frequency band is determined based on the highest operating frequency of the frequency band, and the longest oscillator length is determined based on the lowest operating frequency of the frequency band; the shortest oscillator length of the next frequency band is equal to the longest oscillator length of the previous frequency band, and the longest oscillator length is determined based on the lowest operating frequency of the next frequency band.

[0039] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0040] Existing mobile communication frequency bands are discrete and discontinuous. For example, my country's indoor mobile communication frequency bands are 806MHz-960MHz, 1710MHz-2690MHz, and 3300MHz-3700MHz, among which there are multiple non-operating frequency bands (such as 960MHz-1710MHz and 2690MHz-3710MHz). Traditional methods typically use a single geometry factor and spacing factor to cover the entire frequency band, resulting in unnecessary dimensional redundancy in non-operating frequency bands. The present invention, however, uses parameter differentiation design to determine the geometry factor and spacing factor in the operating frequency band based on the required gain performance and the frequency range of the operating frequency band. In non-operating frequency bands, since high performance is not required and some performance degradation is acceptable, smaller geometry factors and spacing factors are selected. A smaller geometry factor means a smaller ratio of adjacent dipole lengths, meaning that the dipole lengths change more quickly. A smaller spacing factor directly reduces the distance between adjacent dipoles, thereby increasing the antenna angle (the angle formed by the extended lines of adjacent dipoles). Increasing the antenna angle can shorten the longitudinal dimension of the antenna because a larger angle allows for a more compact arrangement of the dipoles in the longitudinal direction. Through the above-mentioned differentiated parameter design, the present invention specifically compresses the non-working frequency band without affecting the performance of the working frequency band, thereby reducing the overall length of the antenna and meeting the demand for antenna miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0042] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 A schematic diagram of a flow chart of a design method for a log-periodic dipole antenna provided in an embodiment of the present disclosure;

[0044] Figure 2 A schematic diagram of a relationship model between gain, geometric factor, and spacing factor provided in an embodiment of the present disclosure;

[0045] Figure 3 A specific example flow chart of a design method for a logarithmic periodic dipole antenna is provided for an embodiment of the present application;

[0046] Figure 4 To design the 960 MHz frequency pattern of the logarithmic periodic dipole antenna according to this method;

[0047] Figure 5 To design the directional pattern of the logarithmic periodic dipole antenna at 2690 MHz according to this method;

[0048] Figure 6 To design the directional pattern of the logarithmic periodic dipole antenna at 3700 MHz according to this method;

[0049] Figure 7 To design the VSWR diagram of the log-periodic dipole antenna according to this method;

[0050] Figure 8 A schematic structural diagram of a design device for a log-periodic dipole antenna provided in an embodiment of the present disclosure;

[0051] Figure 9 A schematic structural diagram of a log-periodic dipole antenna provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0052] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0053] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0054] The present disclosure provides a method for designing a log-periodic dipole antenna. Figure 1 A flow chart of a design method for a logarithmic periodic dipole antenna provided in an embodiment of the present disclosure is shown as follows: Figure 1 As shown in Figure 1, the design method of the log-periodic dipole antenna includes:

[0055] S101: Determine the longest oscillator length and the shortest oscillator length of each frequency band.

[0056] The existing mobile communication frequency bands are discrete and discontinuous. For example, the indoor mobile communication frequency bands in my country are 806MHz-960MHz, 1710MHz-2690MHz, and 3300MHz-3700MHz. There are multiple non-working frequency bands (such as 960MHz-1710MHz, 2690MHz-3710MHz). The disclosed embodiment can clarify the various frequency bands of the antenna, including working frequency bands and non-working frequency bands, according to actual application requirements. In the entire available frequency band, except for the working frequency band, the remaining frequency bands are non-working frequency bands, and then the longest vibrator length and the shortest vibrator length of each frequency band are determined.

[0057] S102: Based on the frequency band type being a working frequency band, determine the geometric factor and spacing factor corresponding to the current frequency band according to the gain requirement; or, based on the frequency band type being a non-working frequency band, use the first geometric factor and the first spacing factor as the geometric factor and spacing factor corresponding to the frequency band.

[0058] The first geometric factor is smaller than the geometric factor corresponding to the adjacent working frequency band; and the first spacing factor is smaller than the spacing factor corresponding to the adjacent working frequency band.

[0059] Traditional methods typically use a single geometry factor and spacing factor to cover the entire frequency band, resulting in unnecessary size redundancy in non-operating frequency bands. However, the disclosed embodiments employ parameter differentiation to design the geometry factor and spacing factor based on gain requirements within the operating frequency band, ensuring optimal performance in critical frequency bands.

[0060] Gain is a key antenna performance metric, and high antenna gain must be maintained within the operating frequency band. Through theoretical analysis and empirical formulas, a model is established to model the relationship between gain, geometric factor, and spacing factor. Generally speaking, within a certain range, increasing the geometric factor improves antenna gain, but this increases the longitudinal distance between antennas. An appropriate spacing factor can optimize the antenna's radiation pattern and increase gain. The range of geometric and spacing factors is determined based on the required gain metric and the operating frequency range. By referencing the design parameters of existing similar antennas or performing preliminary simulations using electromagnetic simulation software, a combination of geometric and spacing factors that meets the gain requirements within the operating frequency band can be determined.

[0061] Figure 2A schematic diagram of a relationship model between gain, geometric factor and spacing factor provided in an embodiment of the present disclosure. Figure 2 The relationship model between gain, geometric factor and spacing factor is used to determine the geometric factor and spacing factor corresponding to the current frequency band based on the gain requirements.

[0062] In the entire available frequency band, except for the operating frequency band, the remaining frequency band is the non-operating frequency band. In the non-operating frequency band, since high performance is not required and some performance degradation is acceptable, smaller geometric factors and spacing factors are selected. A smaller geometric factor means a smaller ratio of adjacent dipole lengths, meaning that dipole lengths change more rapidly, thereby increasing the antenna angle (the angle formed by the extended lines of adjacent dipoles). Based on geometric relationships, the antenna angle is related to the geometric factor and spacing factor. Increasing the antenna angle can shorten the longitudinal dimension of the antenna because a larger angle allows the dipoles to be arranged more compactly in the longitudinal direction. The geometric factor determines the scaling ratio of adjacent dipole lengths; a smaller geometric factor causes dipole lengths to decay more rapidly. The spacing factor determines the spacing between adjacent dipoles; a smaller spacing factor directly shortens the spacing between dipoles. The disclosed embodiments use the first geometric factor and first spacing factor in the non-operating frequency band. Because the first geometric factor is smaller than the geometric factor corresponding to the adjacent operating frequency band, and the first spacing factor is smaller than the spacing factor corresponding to the adjacent operating frequency band, the dipoles in the non-operating frequency band can be denser and shorter, increasing the antenna angle and thus compressing the longitudinal dimension.

[0063] S103 : Determine the number of vibrators in the frequency band, the length of each vibrator, and the distance between adjacent vibrators according to the longest vibrator length, the shortest vibrator length, the geometric factor, and the spacing factor in the frequency band.

[0064] Specifically, after determining the geometric factors and spacing factors of the working frequency band and the non-working frequency band, the number of oscillators in the frequency band, the length of each oscillator, and the spacing between adjacent oscillators are determined based on the longest oscillator length, the shortest oscillator length, the geometric factors, and the spacing factors of each frequency band to complete the design of the logarithmic periodic dipole antenna.

[0065] By designing appropriate geometric factors and spacing factors within the operating frequency band based on gain requirements, the disclosed embodiments ensure that the antenna has good performance indicators such as gain within the operating frequency band, preventing significant degradation of operating frequency band performance due to design in the non-operating frequency band. By using smaller geometric factors and spacing factors (first geometric factors and first spacing factors) in the non-operating frequency band, the antenna angle is increased, effectively shortening the longitudinal distance in the non-operating frequency band, thereby reducing the overall length of the antenna and meeting the demand for antenna miniaturization.

[0066] In some optional implementations, determining the longest vibrator length and the shortest vibrator length in each frequency band may include:

[0067] Starting from the lowest frequency, the longest oscillator length of the first frequency band is determined according to the lowest operating frequency of the first frequency band, and the shortest oscillator length of the first frequency band is determined according to the highest operating frequency of the first frequency band;

[0068] The shortest oscillator length of the previous frequency band is used as the longest oscillator length of the next frequency band, and the shortest oscillator length of the next frequency band is determined according to the highest operating frequency of the next frequency band.

[0069] If the antenna design starts from the lowest frequency, first determine the longest and shortest oscillator lengths of the first frequency band. The first frequency band is the working frequency band. The longest oscillator length of the first frequency band is determined according to the lowest working frequency of the first frequency band, and the shortest oscillator length of the first frequency band is determined according to the highest working frequency of the first frequency band.

[0070] For example, the lowest operating frequency of the first frequency band is f min (1), the highest operating frequency of the first frequency band is f max (1), then the wavelength corresponding to the lowest operating frequency of the first frequency band is λ max (1) The wavelength corresponding to the highest operating frequency of the first frequency band is λ min (1):

[0071] λ max (1) = C / f min (1), λ min (1) = C / f max (1).

[0072] Determine the longest oscillator length L of the first frequency band based on the lowest operating frequency of the first frequency band max (1) Determine the shortest oscillator length L of the first frequency band according to the highest operating frequency of the first frequency band min (1):

[0073] L max (1) = λ max (1) / 2=C / 2f min (1);

[0074] L min (1) = λ min (1) / 2=C / 2f max (1).

[0075] Next, determine the longest and shortest oscillator lengths of the next frequency band in turn. Use the shortest oscillator length of the previous frequency band as the longest oscillator length of the next frequency band, and determine the shortest oscillator length of the next frequency band based on the highest operating frequency of the next frequency band:

[0076] Then L max (i+1)=L i (n), L min(i+1)=λ min (i+1) / 2=C / 2f max (i+1)

[0077] Among them, Li(n) is the length of the nth oscillator in the i-th frequency band (the shortest oscillator length in the previous frequency band), L max (i+1) is the longest oscillator length of the i+1th frequency band (the longest oscillator length of the next frequency band), L min (i+1) is the shortest oscillator length of the i+1th frequency band (the shortest oscillator length of the next frequency band), f max (i+1) is the highest operating frequency of the i+1th frequency band (the highest operating frequency of the next frequency band), λ min (i+1) is the wavelength corresponding to the highest operating frequency in the (i+1)th frequency band. i is a positive integer.

[0078] The longest oscillator length in the next frequency band is directly the same as the shortest oscillator length in the previous frequency band. This design ensures continuous frequency coverage between bands and avoids structural discontinuity caused by sudden changes in oscillator length. If there are more frequency bands, repeat the above steps. The longest oscillator in each frequency band inherits the shortest oscillator length of the previous frequency band, ensuring structural continuity.

[0079] The disclosed embodiment achieves effective compression of the longitudinal dimensions of the non-working frequency band while ensuring the continuity and structural stability of the frequency band connection through the inheritance of the oscillator length between frequency bands (the shortest oscillator length of the previous frequency band serves as the longest oscillator length of the next frequency band) and differentiated parameter design (the working frequency band adopts the geometric factor and spacing factor determined according to the gain requirements, and the non-working frequency band adopts the smaller first geometric factor and first spacing factor).

[0080] In some optional implementations, determining the longest vibrator length and the shortest vibrator length in each frequency band may include:

[0081] Starting from the highest frequency, the longest oscillator length of the first frequency band is determined according to the lowest operating frequency of the first frequency band, and the shortest oscillator length of the first frequency band is determined according to the highest operating frequency of the first frequency band;

[0082] The longest oscillator length of the previous frequency band is used as the shortest oscillator length of the next frequency band, and the longest oscillator length of the next frequency band is determined according to the lowest operating frequency of the next frequency band.

[0083] If the antenna design starts from the highest frequency, first determine the longest oscillator length and the shortest oscillator length of the first frequency band. The first frequency band is the working frequency band. The longest oscillator length of the first frequency band is determined according to the lowest working frequency of the first frequency band, and the shortest oscillator length of the first frequency band is determined according to the highest working frequency of the first frequency band.

[0084] Next, the longest and shortest oscillator lengths of the next frequency band are determined in sequence. The longest oscillator length of the previous frequency band is used as the shortest oscillator length of the next frequency band, and the longest oscillator length of the next frequency band is determined based on the lowest operating frequency of the next frequency band.

[0085] Unlike the above-mentioned embodiment, the disclosed embodiment can start the design from the highest frequency. Similarly, the shortest vibrator length of the next frequency band can be directly adopted from the longest vibrator length of the previous frequency band, ensuring continuous frequency coverage between bands and avoiding structural discontinuity caused by sudden changes in vibrator length. If more frequency bands are present, the above steps are repeated, and the shortest vibrator length of each frequency band inherits the longest vibrator length of the previous frequency band, ensuring structural continuity.

[0086] In some optional implementations, determining the number of vibrators in a frequency band, the length of each vibrator, and the spacing between adjacent vibrators based on the longest vibrator length, the shortest vibrator length, the geometric factor, and the spacing factor in the frequency band includes:

[0087] The following formula is used to determine the number of oscillators in the frequency band, the length of each oscillator, and the distance between adjacent oscillators:

[0088]

[0089] L i (n) = L i (n-1)·τ;

[0090] D i (n-1)=L i (n-2)·2σ;

[0091] Among them, N i represents the number of oscillators in the i-th frequency band, Indicates rounding up, L min (i) represents the shortest oscillator length in the i-th frequency band, L max (i) represents the longest oscillator length of the i-th frequency band, τ represents the geometric factor of the i-th frequency band; σ represents the spacing factor of the i-th frequency band, L i (n) represents the length of the nth oscillator in the i-th frequency band, L i (n-1) represents the length of the n-1th oscillator in the i-th frequency band, D i (n-1) represents L i (n) and L i (n-1) The distance between the oscillators; L i (n-2) represents the length of the n-2th oscillator in the i-th frequency band; i is a positive integer.

[0092] When calculating the number of vibrators, the embodiment of the present disclosure rounds up to ensure that the shortest vibrator length is not less than the theoretical value, avoiding band coverage gaps caused by insufficient number of vibrators, and is particularly suitable for multi-band connection scenarios. The vibrator spacing formula makes the spacing between adjacent vibrators strongly correlated with the vibrator length. Combined with the smaller spacing factor of the non-working frequency band, the vibrator spacing can be significantly reduced, the antenna angle can be increased (, and the longitudinal size compression can be achieved. Each frequency band can independently set the geometric factor and spacing factor, and the vibrator parameters corresponding to each frequency band are calculated by formula. The parameters of the working frequency band and the non-working frequency band are set separately. While ensuring the performance of the working frequency band, the non-working frequency band is allowed to sacrifice performance moderately in exchange for size optimization.

[0093] If there are multiple non-operating frequency bands, the geometry factor and spacing factor for each non-operating frequency band can be set independently. The geometry factors for different non-operating frequency bands can be the same or different, and the spacing factors can be the same or different. This is sufficient as long as each non-operating frequency band has a smaller geometry factor and spacing factor than the adjacent operating frequency band.

[0094] In some optional implementations, the geometric factors and spacing factors of different non-working frequency bands may be adjusted according to the frequency interval of the non-working frequency bands and / or the antenna size compression requirements.

[0095] For example, some non-operating frequency bands may require greater compression, so the geometry factor and spacing factor can be set to a smaller value. Alternatively, non-operating frequency bands with large frequency intervals can use smaller geometry factors and spacing factors to achieve greater compression. That is, the larger the frequency interval between non-operating frequency bands, the smaller the geometry factor and spacing factor corresponding to the non-operating frequency bands.

[0096] In some optional implementations, the design method of the log-periodic dipole antenna may further include: determining that the design of the oscillator parameters of each frequency band is completed, and simulating to determine the collective line parameters of the log-periodic dipole antenna.

[0097] After completing the design of the oscillator parameters for each frequency band, simulation can be used to determine the collective line parameters of the log-periodic dipole antenna, such as the collective line length and width. For example, magnetic simulation software can be used to set parameter sweep optimization, and the optimal collective line length and width can be determined based on gain requirements to complete the overall antenna design.

[0098] Figure 3 A specific example flow chart of a design method for a logarithmic periodic dipole antenna is provided for the embodiment of the present application. Figure 3 As shown in Figure 1, the design method of the log-periodic dipole antenna includes:

[0099] S201 , starting from the lowest frequency, determining the longest oscillator length of the first frequency band according to the lowest operating frequency of the first frequency band, and determining the shortest oscillator length of the first frequency band according to the highest operating frequency of the first frequency band, the first frequency band being the operating frequency band.

[0100] S202: Determine a geometric factor and a spacing factor corresponding to the current frequency band according to a gain requirement.

[0101] S203 : Determine the number of vibrators in the frequency band, the length of each vibrator, and the distance between adjacent vibrators according to the longest vibrator length, the shortest vibrator length, the geometric factor, and the spacing factor in the frequency band.

[0102] S204: Determine whether the next frequency band is a working frequency band.

[0103] If yes, execute S205 and then return to execute S202. If no, execute S206 and then return to execute S203.

[0104] S205: Determine the longest oscillator length and the shortest oscillator length of the next frequency band, and use the next frequency band as the current frequency band.

[0105] S206: Determine the longest oscillator length and the shortest oscillator length of the next frequency band, use the first geometric factor and the first spacing factor as the geometric factor and spacing factor corresponding to the next frequency band, and use the next frequency band as the current frequency band.

[0106] S207 , determining that the design of the oscillator parameters of each frequency band is completed, and determining the collective line parameters of the logarithmic periodic dipole antenna through simulation.

[0107] The embodiment of the present disclosure is designed according to the above design method for indoor mobile communication frequency bands of 806-960MHz, 1710-2690MHz, and 3300-3700MHz, and the following experimental effect diagram is obtained: Figure 4 To design the 960 MHz frequency pattern of the log-periodic dipole antenna according to this method, Figure 5 To design the directional pattern of the log-periodic dipole antenna at 2690 MHz according to this method, Figure 6 The directional pattern of the logarithmic periodic dipole antenna at 3700 MHz is designed according to this method. Figure 7 VSWR diagram of the log-periodic dipole antenna designed according to this method.

[0108] See also Figure 4 The directional pattern of the logarithmic periodic dipole antenna at 960MHz. At 960MHz, the directional pattern of the logarithmic periodic dipole antenna remains stable, and its gain is 9.05dBi. Figure 5The directional pattern of the logarithmic periodic dipole antenna at 2690 MHz. At 2690 MHz, the directional pattern of the logarithmic periodic dipole antenna remains stable, and its gain is 11.68 dBi. Figure 6 The directional pattern of the logarithmic periodic dipole antenna at 3700 MHZ frequency point, at 3700 MHZ frequency point, the directional pattern of the logarithmic periodic dipole antenna remains stable, and its gain is 13.3 dBi. Figure 7 The voltage standing wave ratio (VSWR) graph of the log-periodic dipole antenna shown shows that: in the 806-960MHz frequency band, the VSWR is less than 1.33; in the 1710-2690MHz frequency band, the VSWR is less than 1.36; in the 3300-3700MHz frequency band, the VSWR is less than 1.25.

[0109] Based on the same technical concept, an embodiment of the present disclosure further provides a design device for a log-periodic dipole antenna, which can implement the functions of the design method for a log-periodic dipole antenna in the aforementioned embodiment.

[0110] See also Figure 8 , which is a structural diagram of a design device for a logarithmic periodic dipole antenna provided by an embodiment of the present disclosure, such as Figure 8 As shown, the design device of the logarithmic periodic dipole antenna includes:

[0111] The oscillator length determination module 31 is used to determine the longest oscillator length and the shortest oscillator length of each frequency band;

[0112] a factor determination module 32 configured to determine a geometric factor and a spacing factor corresponding to the current frequency band based on a gain requirement if the frequency band is an operating frequency band; or, based on a non-operating frequency band, to use the first geometric factor and the first spacing factor as the geometric factor and spacing factor corresponding to the frequency band;

[0113] The vibrator design module 33 is used to determine the number of vibrators in the frequency band, the length of each vibrator, and the distance between adjacent vibrators based on the longest vibrator length, the shortest vibrator length, the geometric factor, and the spacing factor of the frequency band;

[0114] The first geometric factor is smaller than the geometric factor corresponding to the adjacent working frequency band; and the first spacing factor is smaller than the spacing factor corresponding to the adjacent working frequency band.

[0115] Optionally, the vibrator length determining module 31 is configured to, starting from the lowest frequency, determine the longest vibrator length of the first frequency band according to the lowest operating frequency of the first frequency band, and determine the shortest vibrator length of the first frequency band according to the highest operating frequency of the first frequency band;

[0116] The shortest oscillator length of the previous frequency band is used as the longest oscillator length of the next frequency band, and the shortest oscillator length of the next frequency band is determined according to the highest operating frequency of the next frequency band.

[0117] Optionally, the vibrator length determining module 31 is configured to determine, starting from the highest frequency, the longest vibrator length of the first frequency band according to the lowest operating frequency of the first frequency band, and determine the shortest vibrator length of the first frequency band according to the highest operating frequency of the first frequency band;

[0118] The longest oscillator length of the previous frequency band is used as the shortest oscillator length of the next frequency band, and the longest oscillator length of the next frequency band is determined according to the lowest operating frequency of the next frequency band.

[0119] Optionally, the vibrator design module 33 is configured to determine the number of vibrators in a frequency band, the length of each vibrator, and the distance between adjacent vibrators using the following formula:

[0120]

[0121] L i (n) = L i (n-1)·τ;

[0122] D i (n-1)=L i (n-2)·2σ;

[0123] Among them, N i represents the number of oscillators in the i-th frequency band, Indicates rounding up, L min (i) represents the shortest oscillator length in the i-th frequency band, L max (i) represents the longest oscillator length of the i-th frequency band, τ represents the geometric factor of the i-th frequency band; σ represents the spacing factor of the i-th frequency band, L i (n) represents the length of the nth oscillator in the i-th frequency band, L i (n-1) represents the length of the n-1th oscillator in the i-th frequency band, D i (n-1) represents L i (n) and L i (n-1) The distance between the oscillators; L i (n-2) represents the length of the n-2th oscillator in the i-th frequency band; i is a positive integer.

[0124] Optionally, if there are multiple non-working frequency bands, the larger the frequency interval of the non-working frequency bands, the smaller the geometric factor and spacing factor corresponding to the non-working frequency bands.

[0125] Optionally, a collective line parameter design module may be included to determine the completion of the design of the oscillator parameters of each frequency band and to determine the collective line parameters of the logarithmic periodic dipole antenna through simulation.

[0126] It should be noted that the design device for the logarithmic periodic dipole antenna provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned method embodiment and can achieve the same technical effects. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0127] The embodiments of the present disclosure also provide a processor-readable storage medium, which stores a program. When the program is processed and executed, it implements the design method of the logarithmic periodic dipole antenna as in any of the above embodiments. Therefore, it has the beneficial effects of the above embodiments, and the embodiments of the present disclosure are not described in detail here. The processor-readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (such as CD, DVD, BD, HVD, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)), etc. The processor-readable storage medium provided in the above embodiments of the present disclosure and the method provided in the embodiments of the present disclosure are based on the same inventive concept and have the same beneficial effects as the method adopted, run or implemented by the application or instructions stored therein.

[0128] The present disclosure also provides a log-periodic dipole antenna, including:

[0129] Multiple frequency bands;

[0130] The geometric factor and spacing factor corresponding to the working frequency band are determined according to the gain requirements; the non-working frequency band corresponds to the first geometric factor and the first spacing factor;

[0131] The number of oscillators in the oscillator group of each frequency band, the length of each oscillator and the distance between adjacent oscillators are determined by the longest oscillator length, the shortest oscillator length, the geometric factor and the spacing factor of the frequency band;

[0132] The first geometric factor is smaller than the geometric factor corresponding to the adjacent working frequency band; and the first spacing factor is smaller than the spacing factor corresponding to the adjacent working frequency band.

[0133] The logarithmic periodic dipole antenna in the embodiment of the present disclosure can be implemented by using the design method of any logarithmic periodic dipole antenna mentioned above. Both adopt the same inventive concept. The logarithmic periodic dipole antenna provided by the embodiment of the present disclosure, the geometric factor and spacing factor corresponding to the working frequency band are determined according to the gain requirement, the non-working frequency band corresponds to the first geometric factor and the first spacing factor, the first geometric factor is smaller than the geometric factor corresponding to the adjacent working frequency band, and the first spacing factor is smaller than the spacing factor corresponding to the adjacent working frequency band. Since the appropriate geometric factor and spacing factor are designed according to the gain requirement within the working frequency band, and the various parameters of the oscillator are determined according to the above-mentioned geometric factor and spacing factor, it is ensured that the antenna has good performance indicators such as gain within the working frequency band, and the performance of the working frequency band will not be greatly reduced due to the design of the non-working frequency band. By using a smaller geometric factor and spacing factor (the first geometric factor and the first spacing factor) in the non-working frequency band, the antenna angle is increased, and the longitudinal distance of the non-working frequency band is effectively shortened, thereby reducing the overall length of the antenna and meeting the demand for miniaturization of the antenna.

[0134] Optionally, starting from the lowest frequency, the longest vibrator length of the first frequency band is determined based on the lowest operating frequency of the frequency band, and the shortest vibrator length is determined based on the highest operating frequency of the frequency band; the longest vibrator length of the next frequency band is equal to the shortest vibrator length of the previous frequency band, and the shortest vibrator length is determined based on the highest operating frequency of the next frequency band;

[0135] Alternatively, starting from the highest frequency, the shortest oscillator length of the first frequency band is determined based on the highest operating frequency of the frequency band, and the longest oscillator length is determined based on the lowest operating frequency of the frequency band; the shortest oscillator length of the next frequency band is equal to the longest oscillator length of the previous frequency band, and the longest oscillator length is determined based on the lowest operating frequency of the next frequency band.

[0136] Figure 9 A schematic diagram of the structure of a logarithmic periodic dipole antenna provided in an embodiment of the present disclosure is shown in FIG. Figure 9 As shown, the first oscillator from the left is 101, and there are 8 oscillators from 201 to 203, corresponding to the 3300-3700MHz frequency band; there are 3 oscillators from 201 to 203, corresponding to the 1710-2690MHz frequency band; there are 4 oscillators from 301 to 304, corresponding to the 806-960MHz frequency band.

[0137] Optionally, if there are multiple non-working frequency bands, the larger the frequency interval of the non-working frequency bands, the smaller the geometric factor and spacing factor corresponding to the non-working frequency bands.

[0138] It should be noted that, in this document, 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 "comprises," "comprising," or any other variations 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 elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0139] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. 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 disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A method for designing a log-periodic dipole antenna, characterized in that: include: Determine the longest and shortest oscillator lengths for each frequency band; Based on the type of the frequency band being a working frequency band, determining the geometric factor and spacing factor corresponding to the current frequency band according to the gain requirement; or, based on the type of the frequency band being a non-working frequency band, using the first geometric factor and the first spacing factor as the geometric factor and spacing factor corresponding to the frequency band; Determine the number of vibrators in the frequency band, the length of each vibrator, and the distance between adjacent vibrators according to the longest vibrator length, the shortest vibrator length, the geometric factor, and the spacing factor in the frequency band; The first geometric factor is smaller than the geometric factor corresponding to the adjacent working frequency band; the first spacing factor is smaller than the spacing factor corresponding to the adjacent working frequency band.

2. The method for designing a log-periodic dipole antenna according to claim 1, wherein: Determining the longest vibrator length and the shortest vibrator length of each frequency band includes: Starting from the lowest frequency, the longest oscillator length of the first frequency band is determined according to the lowest operating frequency of the first frequency band, and the shortest oscillator length of the first frequency band is determined according to the highest operating frequency of the first frequency band; The shortest oscillator length of the previous frequency band is used as the longest oscillator length of the next frequency band, and the shortest oscillator length of the next frequency band is determined according to the highest operating frequency of the next frequency band.

3. The method for designing a log-periodic dipole antenna according to claim 1, wherein: Determining the longest vibrator length and the shortest vibrator length of each frequency band includes: Starting from the highest frequency, the longest oscillator length of the first frequency band is determined according to the lowest operating frequency of the first frequency band, and the shortest oscillator length of the first frequency band is determined according to the highest operating frequency of the first frequency band; The longest oscillator length of the previous frequency band is used as the shortest oscillator length of the next frequency band, and the longest oscillator length of the next frequency band is determined according to the lowest operating frequency of the next frequency band.

4. The method for designing a log-periodic dipole antenna according to claim 1, wherein: Determining the number of vibrators in the frequency band, the length of each vibrator, and the spacing between adjacent vibrators according to the longest vibrator length, the shortest vibrator length, the geometric factor, and the spacing factor in the frequency band includes: The following formula is used to determine the number of oscillators in the frequency band, the length of each oscillator, and the distance between adjacent oscillators: L i (n)=L i (n-1)·t; D i (n-1)=L i (n-2)·2σ; Among them, N i represents the number of oscillators in the i-th frequency band, Indicates rounding up, L min (i) represents the shortest oscillator length in the i-th frequency band, L max (i) represents the longest oscillator length of the i-th frequency band, τ represents the geometric factor of the i-th frequency band; σ represents the spacing factor of the i-th frequency band, L i (n) represents the length of the nth oscillator in the i-th frequency band, L i (n-1) represents the length of the n-1th oscillator in the i-th frequency band, D i (n-1) represents L i (n) and L i (n-2) The distance between the oscillators; L i (n-2) represents the length of the n-2th oscillator in the i-th frequency band; i is a positive integer.

5. The method for designing a log-periodic dipole antenna according to claim 1, wherein: If there are multiple non-working frequency bands, the larger the frequency interval between the non-working frequency bands, the smaller the geometric factor and spacing factor corresponding to the non-working frequency bands.

6. The method for designing a log-periodic dipole antenna according to claim 1, wherein: Also includes: The design of the oscillator parameters for each frequency band is completed, and the collective line parameters of the log-periodic dipole antenna are determined by simulation.

7. A design device for a log-periodic dipole antenna, characterized in that: include The oscillator length determination module is used to determine the longest oscillator length and the shortest oscillator length of each frequency band; a factor determination module, configured to determine, based on the frequency band being a working frequency band and according to the gain requirement, a geometric factor and a spacing factor corresponding to the current frequency band; or, based on the frequency band being a non-working frequency band, use the first geometric factor and the first spacing factor as the geometric factor and spacing factor corresponding to the frequency band; A vibrator design module, configured to determine the number of vibrators in the frequency band, the length of each vibrator, and the spacing between adjacent vibrators based on the longest vibrator length, the shortest vibrator length, the geometric factor, and the spacing factor in the frequency band; The first geometric factor is smaller than the geometric factor corresponding to the adjacent working frequency band; the first spacing factor is smaller than the spacing factor corresponding to the adjacent working frequency band.

8. A processor-readable storage medium, characterized in that: The processor-readable storage medium stores a program, and the program is used to enable the processor to execute the method according to any one of claims 1 to 6.

9. A log-periodic dipole antenna, characterized in that: include: Multiple frequency bands; The geometric factor and spacing factor corresponding to the working frequency band are determined according to the gain requirements; the non-working frequency band corresponds to the first geometric factor and the first spacing factor; The number of oscillators in the oscillator group of each frequency band, the length of each oscillator and the distance between adjacent oscillators are determined by the longest oscillator length, the shortest oscillator length, the geometric factor and the spacing factor of the frequency band; The first geometric factor is smaller than the geometric factor corresponding to the adjacent working frequency band; the first spacing factor is smaller than the spacing factor corresponding to the adjacent working frequency band.

10. The log-periodic dipole antenna according to claim 9, characterized in that: Starting from the lowest frequency, the longest oscillator length of the first frequency band is determined based on the lowest operating frequency of the frequency band, and the shortest oscillator length is determined based on the highest operating frequency of the frequency band; the longest oscillator length of the next frequency band is equal to the shortest oscillator length of the previous frequency band, and the shortest oscillator length is determined based on the highest operating frequency of the next frequency band; Alternatively, starting from the highest frequency, the shortest oscillator length of the first frequency band is determined based on the highest operating frequency of the frequency band, and the longest oscillator length is determined based on the lowest operating frequency of the frequency band; the shortest oscillator length of the next frequency band is equal to the longest oscillator length of the previous frequency band, and the longest oscillator length is determined based on the lowest operating frequency of the next frequency band.

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