Ultra-wideband miniaturized log-periodic antenna with length of 261 mm

Abstract

An ultra-wideband miniaturized log-periodic antenna with the length of 261 mm is characterized by comprising an outer cover, a first log-periodic oscillator, a second log-periodic oscillator, a dipole group, a reflecting plate and a bottom cover, the bottom of the first log-periodic oscillator and the bottom of the second log-periodic oscillator are connected with the reflecting plate, the reflecting plate is arranged in the bottom cover, and the dipole group is arranged on the outer cover. The bottom of the outer cover is connected with the bottom cover, and the first log-periodic oscillator, the second log-periodic oscillator, the dipole group and the reflecting plate are all arranged in the outer cover. By designing the two log periodic oscillators with the size of 261 mm, the size of the antenna is greatly reduced, and by adopting a non-strictly symmetrical tail end loading fractal technology and a tail end opening technology, the antenna can meet the requirements of China Mobile 880-960 MHz amp at the same time; the frequency is 1710-2675 MHz, the standing wave full frequency band is less than or equal to 1.42, and the gain sub-frequency band is greater than or equal to 7.8 amp; 8.8 dBi, and the horizontal plane wave width frequency division band satisfies 100-102 degree amp; the front-to-back ratio is greater than or equal to 16dB in the full frequency band, and the full index meets the requirements of related products of China Mobile.

Description

Technical Field

[0001] The present invention belongs to the technical field of antennas, and in particular relates to an ultra-wideband miniaturized log-periodic antenna with a length of 261 mm. Background Art

[0002] Logarithmic periodic dipole antennas have the advantages of wide working frequency band, high gain, good front-to-back ratio, little influence by the installation platform, easy processing, and low cost, and are widely used in indoor distribution scenarios. Based on the principle of logarithmic periodic antennas, the structural feature of logarithmic periodic antennas is that the ratio of the length and spacing of adjacent oscillators is the same, which is defined as the proportional factor τ. Take the length of a certain dipole section as Ln, and the spacing between it and the next dipole section as dn, and dn / Ln is defined as the spacing factor σ. For traditional logarithmic periodic dipole antennas, the academic community has developed a mature table lookup method, that is, if antennas with different gains and wavelengths are required, you only need to look up the table to find the appropriate combination of proportional factor τ and spacing factor σ. The advantage of this design method is that even engineers and technicians who are not familiar with the principle of logarithmic periodic antennas can quickly design antennas that meet the requirements of the specified directional pattern. The disadvantage is that the design method is single and it is impossible to design a miniaturized and broadband antenna.

[0003] Logarithmic periodic antennas are widely used in the field of indoor distribution. For a long time, for China Mobile's frequency bands, i.e. 880-960MHz & 1710-2675MHz, in order to meet the actual use requirements, the directional pattern indicators usually require the gain of the frequency band to be ≥7.5 & 8.0dBi, the horizontal plane wave width of the whole frequency band to meet 70 ~ 110° & 60-100°, and the front-to-back ratio of the whole frequency band to be ≥13dB.

[0004] To meet the above requirements, sheet metal solutions with a length of 440 to 510 mm are widely used on the market. There are also some smaller solutions on the market, such as CN221102435U, a small broadband log-periodic antenna that is easy to install, with a size of 230*180*40mm and a coverage range of 806-3700MHz, covering the mobile frequency band, but the actual directional pattern indicators cannot meet the mobile requirements. Summary of the invention

[0005] In order to achieve the above-mentioned purpose as described in the background technology, the present invention adopts the following technical solution:

[0006] An ultra-wideband miniaturized log-periodic antenna with a length of 261 mm comprises: an outer cover, a first log-periodic oscillator, a second log-periodic oscillator, a dipole group, a reflector, and a bottom cover, wherein the first log-periodic oscillator and the second log-periodic oscillator are connected to the reflector at their bottoms, the reflector is arranged in the bottom cover, the bottom of the outer cover is connected to the bottom cover, and the first log-periodic oscillator, the second log-periodic oscillator, the dipole group and the reflector are all arranged in the outer cover.

[0007] The dipole groups include a first pair of dipole groups, a second pair of dipole groups, a third pair of dipole groups, a fourth pair of dipole groups, a fifth pair of dipole groups, a sixth pair of dipole groups, a seventh pair of dipole groups, an eighth pair of dipole groups, a ninth pair of dipole groups, a tenth pair of dipole groups, an eleventh pair of dipole groups, and a twelfth pair of dipole groups, wherein one of the dipoles in each pair of the twelve pairs of dipole groups is connected to the first log-periodic antenna, and the other is connected to the second log-periodic antenna.

[0008] Furthermore, the length of the dipole group decreases from bottom to top.

[0009] Furthermore, the first pair of dipole groups are provided with loading members at the upper and lower sides, and the loading member at the lower end is longer than that at the upper end.

[0010] Furthermore, a loading component is disposed upward at the end of the seventh pair of dipole groups, loading components are disposed on upper and lower sides of the ends of the tenth pair of dipole groups and the eleventh pair of dipole groups, and a loading component is disposed downward at the end of the twelfth pair of dipole groups.

[0011] Furthermore, the ends of the second pair of dipole groups, the fifth pair of dipole groups and the sixth pair of dipole groups are provided with openings, and the openings are rectangular.

[0012] Furthermore, a protrusion is provided at the inner end of the third pair of dipole groups.

[0013] Furthermore, an opening is provided on the main line between the fourth pair of dipoles and the fifth pair of dipoles.

[0014] Furthermore, a group of fixing blocks is correspondingly provided on each of the first logarithmic periodic oscillator and the second logarithmic periodic oscillator.

[0015] Furthermore, a feeding component is connected to the top of the first logarithmic periodic oscillator, and the feeding component is connected to a coaxial feed line.

[0016] Furthermore, the first log-periodic oscillator and the second log-periodic oscillator are both provided with openings at the bottom, and the first log-periodic oscillator and the second log-periodic oscillator are mounted on the reflection plate through the openings.

[0017] Furthermore, the reflective plate is provided with a through hole, and the coaxial feed line passes through the reflective plate through the through hole and extends out of the bottom cover.

[0018] In summary, due to the adoption of the above technical solution, the beneficial results of the present invention are:

[0019] The present invention greatly reduces the size of the antenna by designing two 261mm logarithmic periodic oscillators, and adopts non-strictly symmetrical end-loading fractal technology and end-opening technology, so that the antenna can simultaneously meet the requirements of China Mobile 880-960MHz & 1710-2675MHz, standing wave full frequency band ≤1.42, gain sub-band ≥7.8 & 8.8dBi, horizontal plane wave width sub-band meeting 100 ~ 102 ° & 77-93 °, front-to-back ratio full frequency band ≥16dB, and all indicators meet the requirements of China Mobile related products. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0021] Figure 2 is a diagram showing a first log-periodic antenna and a second log-periodic antenna separated from each other according to an embodiment of the present invention;

[0022] Figure 3 is a diagram of an antenna cover and a bottom cover according to an embodiment of the present invention;

[0023] In the figure: 1. first logarithmic periodic oscillator; 2. second logarithmic periodic oscillator; 3. dipole group; 301. first pair of dipole groups; 302. second pair of dipole groups; 303. third pair of dipole groups; 304. fourth pair of dipole groups; 305. fifth pair of dipole groups; 306. sixth pair of dipole groups; 307. seventh pair of dipole groups; 308. eighth pair of dipole groups; 309. ninth pair of dipole groups; 310. tenth pair of dipole groups; 311. eleventh pair of dipole groups; 312. twelfth pair of dipole groups; 4. loading member; 5. protrusion; 6. opening; 7. fixing block; 8. feeding member; 9. coaxial feed line; 10. reflecting plate; 11. opening; 12. through hole; 13. bottom cover; 14. outer cover. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. 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 the present invention.

[0025] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "inner", "end" 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 patent 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 should not be understood as a limitation on this patent.

[0026] See also Figure 1-Figure 3 An embodiment of the present invention is as follows: an ultra-wideband miniaturized log-periodic antenna with a length of 261 mm, comprising: an outer cover 14, a first log-periodic vibrator 1, a second log-periodic vibrator 2, a dipole group 3, a reflector 10, and a bottom cover 13. The first log-periodic vibrator 1 and the second log-periodic vibrator 2 are connected to the reflector 10 at the bottom, and the reflector 10 is arranged in the bottom cover 13. The bottom of the outer cover 14 is connected to the bottom cover 13, and the first log-periodic vibrator 1, the second log-periodic vibrator 2, the dipole group 3 and the reflector 10 are all arranged in the outer cover 14.

[0027] The dipole groups include a first pair of dipole groups 301, a second pair of dipole groups 302, a third pair of dipole groups 303, a fourth pair of dipole groups 304, a fifth pair of dipole groups 305, a sixth pair of dipole groups 306, a seventh pair of dipole groups 307, an eighth pair of dipole groups 308, a ninth pair of dipole groups 309, a tenth pair of dipole groups 310, an eleventh pair of dipole groups 311, and a twelfth pair of dipole groups 312, wherein one of the dipoles in each of the twelve pairs of dipole groups is connected to the first log-periodic antenna 1, and the other is connected to the second log-periodic antenna 2.

[0028] Furthermore, the length of the dipole group 3 decreases from bottom to top.

[0029] Furthermore, the first pair of dipole groups are provided with loading parts 4 on the upper and lower sides, and the loading part at the lower end is longer than that at the upper end, so as to extend the equivalent current path and introduce stronger coupling reactance. Compared with no loading part, the frequency point supported by the antenna after loading is extended to the low frequency, so as to achieve the purpose of supporting the low frequency band without increasing the size, and effectively realize miniaturization.

[0030] Furthermore, the seventh pair of dipole groups 307 have loading members 4 disposed upward at their ends, the tenth pair of dipole groups 310 and the eleventh pair of dipole groups 311 have loading members 4 disposed on their upper and lower sides at their ends, and the twelfth pair of dipole groups 312 have loading members 4 disposed downward at their ends.

[0031] Furthermore, the ends of the second pair of dipole groups 302 , the fifth pair of dipole groups 305 and the sixth pair of dipole groups 306 are provided with openings, and the openings are rectangular, so that the distributed capacitance at the ends is reduced and the standing wave index is optimized.

[0032] Furthermore, a protrusion 5 is provided at the inner end of the third pair of dipole groups 303, which effectively reduces the imaginary part of the input impedance, improves the standing wave index, and increases the gain in the low frequency band.

[0033] Furthermore, an opening 6 is provided on the main line between the fourth pair of dipoles 304 and the fifth pair of dipoles 305, and the first log-periodic oscillator 1 and the second log-periodic oscillator 2 are fixed using materials including but not limited to plastic columns, so that the first log-periodic oscillator 1 and the second log-periodic oscillator 2 maintain a certain distance. In particular, based on structural strength considerations, the middle position is selected as the starting position. If other shapes of fixed objects are used, the volume becomes larger or smaller, resulting in a change in structural strength, and the number is changed to 1-3.

[0034] Furthermore, a set of fixing blocks 7 are correspondingly provided on the first logarithmic periodic oscillator 1 and the second logarithmic periodic oscillator 2 for fixing the antenna to prevent the antenna from shaking.

[0035] Furthermore, a feeding component 8 is connected to the top of the first logarithmic periodic oscillator 1 , and the feeding component 8 is connected to a coaxial feed line 9 .

[0036] Furthermore, the first log-periodic oscillator 1 and the second log-periodic oscillator 2 are both provided with openings 11 at the bottom, and the first log-periodic oscillator 1 and the second log-periodic oscillator 2 are installed on the reflection plate 10 through the openings 11 .

[0037] Furthermore, a through hole 12 is provided on the reflector 10 , and the coaxial feed line 9 passes through the reflector 10 through the through hole 12 and extends out of the bottom cover 13 .

[0038] In some embodiments, the bottom cover 13 may be eliminated, the two sides of the reflective plate 10 are bent, and the bottom of the outer cover 14 is connected to the reflective plate 10, thereby achieving the purpose of cost saving.

[0039] In some embodiments, the fixing block 7 uses a pair of foams, which can be filled with 1-4 pieces of foam or foam depending on the situation, or a plastic support is used to push the antenna and the outer cover together, and the friction force is used to fix them.

[0040] In some embodiments, different materials and shapes of the fixed objects, as well as different positions of the fixed objects on the antenna, will change the electromagnetic field coupling strength between AB to a certain extent, thus causing changes in the directional pattern and standing waves. At this time, it is necessary to adjust the loading shape of each group of oscillators. Therefore, if other engineers and technicians make corresponding adjustments to the loading shape based on this solution, it also falls within the scope of infringement of this patent.

[0041] The beneficial results of the present invention are:

[0042] The present invention greatly reduces the size of the antenna by designing two 261mm logarithmic periodic oscillators, and adopts non-strictly symmetrical end-loading fractal technology and end-opening technology, so that the antenna can simultaneously meet the requirements of China Mobile 880-960MHz & 1710-2675MHz, standing wave full frequency band ≤1.42, gain sub-band ≥7.8 & 8.8dBi, horizontal plane wave width sub-band meeting 100 ~ 102 ° & 77-93 °, front-to-back ratio full frequency band ≥16dB, and all indicators meet the requirements of China Mobile related products.

[0043] The above describes a specific embodiment of the invention. Other embodiments are within the scope of the appended claims. The terms "exemplary", "example", etc. used throughout this specification mean "used as an example, instance or illustration" and do not mean "preferred" or "advantageous" over other embodiments. In order to provide an understanding of the described technology, the specific implementation includes specific details. However, these technologies can be implemented without these specific details. In some instances, in order to avoid obscuring the concepts of the described embodiments, well-known structures and devices are shown in block diagram form.

[0044] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, a variety of simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the scope of protection and expansion of the embodiments of the present invention.

[0045] The above description of the contents of this specification is provided to enable any person of ordinary skill in the art to implement or use the contents of this specification. Various modifications to the contents of this specification are obvious to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of protection of the contents of this specification. Therefore, the contents of this specification are not limited to the examples and designs described herein, but are consistent with the widest range of principles and novel features disclosed herein.

Claims

1. An ultra-wideband miniaturized log-periodic antenna with a length of 261 mm, characterized in that: include: An outer cover, a first logarithmic periodic oscillator, a second logarithmic periodic oscillator, a dipole group, a reflector, and a bottom cover, wherein the first logarithmic periodic oscillator and the second logarithmic periodic oscillator are connected to the reflector at their bottoms, the reflector is arranged in the bottom cover, the bottom of the outer cover is connected to the bottom cover, and the first logarithmic periodic oscillator, the second logarithmic periodic oscillator, the dipole group, and the reflector are all arranged in the outer cover. The dipole groups include a first pair of dipole groups, a second pair of dipole groups, a third pair of dipole groups, a fourth pair of dipole groups, a fifth pair of dipole groups, a sixth pair of dipole groups, a seventh pair of dipole groups, an eighth pair of dipole groups, a ninth pair of dipole groups, a tenth pair of dipole groups, an eleventh pair of dipole groups, and a twelfth pair of dipole groups, wherein one of the dipoles in each pair of the twelve pairs of dipole groups is connected to the first log-periodic antenna, and the other is connected to the second log-periodic antenna.

2. The ultra-wideband miniaturized log-periodic antenna with a length of 261 mm according to claim 1, characterized in that: The lengths of the dipole groups decrease from bottom to top.

3. The ultra-wideband miniaturized log-periodic antenna with a length of 261 mm according to claim 1, characterized in that: The first pair of dipole groups are provided with loading members at the upper and lower sides, and the loading member at the lower end is longer than that at the upper end.

4. The ultra-wideband miniaturized log-periodic antenna with a length of 261 mm according to claim 1, characterized in that: The end of the seventh pair of dipole groups is provided with a loading component upward, the ends of the tenth pair of dipole groups and the eleventh pair of dipole groups are provided with loading components on both upper and lower sides, and the end of the twelfth pair of dipole groups is provided with a loading component downward.

5. The ultra-wideband miniaturized log-periodic antenna with a length of 261 mm according to claim 1, characterized in that: The ends of the second pair of dipole groups, the fifth pair of dipole groups and the sixth pair of dipole groups are provided with openings, and the openings are rectangular.

6. The ultra-wideband miniaturized log-periodic antenna with a length of 261 mm according to claim 1, characterized in that: A protrusion is provided at the inner end of the third pair of dipole groups.

7. The ultra-wideband miniaturized log-periodic antenna with a length of 261 mm according to claim 1, characterized in that: An opening is arranged on the main line between the fourth pair of dipoles and the fifth pair of dipoles.

8. The ultra-wideband miniaturized log-periodic antenna with a length of 261 mm according to claim 1, characterized in that: A group of fixing blocks is correspondingly disposed on the first logarithmic periodic oscillator and the second logarithmic periodic oscillator.

9. The ultra-wideband miniaturized log-periodic antenna with a length of 261 mm according to claim 1, characterized in that: A feeding component is connected to the top of the first logarithmic periodic oscillator, and the feeding component is connected to a coaxial feed line.

10. The ultra-wideband miniaturized log-periodic antenna with a length of 261 mm according to claim 1, characterized in that: The first log-periodic oscillator and the second log-periodic oscillator are both provided with openings at the bottom, and the first log-periodic oscillator and the second log-periodic oscillator are mounted on the reflection plate through the openings.

11. The ultra-wideband miniaturized log-periodic antenna with a length of 261 mm according to claim 9, characterized in that: The reflective plate is provided with a through hole, and the coaxial feed line passes through the reflective plate through the through hole and extends out of the bottom cover.

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