Multi-band antenna and low-frequency oscillator

Abstract

The present invention relates to a multi-band antenna and a low-frequency oscillator. When the high-frequency signal radiated by the high-frequency oscillator located below passes through the radiation arms and the dielectric loading members of the low-frequency oscillator, scattered signals that weaken or cancel each other can be generated, thereby reducing the radar cross-section value of the low-frequency oscillator in the operating frequency band of the high-frequency oscillator. This not only can avoid the deterioration of port isolation, but also can suppress the influence of the low-frequency oscillator on the radiation pattern of the high-frequency oscillator, thereby improving the radiation pattern of the high-frequency oscillator, avoiding the distortion of the radiation pattern of the high-frequency oscillator, and ensuring the radiation performance of the multi-band antenna.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile communication, and particularly to a multi-band antenna and a low-frequency oscillator. Background Art

[0002] With the continuous development of mobile communication technology, multi-band antennas have been widely used because they can provide diversified services and effectively improve space utilization. Among them, a multi-band antenna includes at least one low-frequency oscillator and at least one high-frequency oscillator. Each low-frequency oscillator and high-frequency oscillator is installed in a limited space, so that there will be strong cross-band scattering interference between the high-frequency oscillator and the low-frequency oscillator, which will not only cause the deterioration of port isolation, but also lead to the distortion of the radiation pattern of the high-frequency oscillator, affecting the radiation performance of the multi-band antenna. Summary of the Invention

[0003] Based on this, it is necessary to provide a multi-band antenna and a low-frequency oscillator for the problems of deteriorated port isolation and distorted radiation pattern of the high-frequency oscillator.

[0004] The technical solution is as follows:

[0005] On the one hand, a low-frequency oscillator is provided. The low-frequency oscillator includes a radiation arm and a dielectric loading member. The dielectric loading member covers at least part of the outer body of the radiation arm. Moreover, when a high-frequency signal passes through, the dielectric loading member and the radiation arm can generate scattering signals that weaken or cancel each other.

[0006] The technical solution is further described below:

[0007] In one embodiment, when the high-frequency signal is coupled to the radiation arm and the dielectric loading member, the radiation arm generates a first scattering signal, and the dielectric loading member generates a second scattering signal. The phases of the first scattering signal and the second scattering signal are different from each other, so that the first scattering signal and the second scattering signal weaken or cancel each other in space.

[0008] In one embodiment, the low-frequency oscillator includes four radiation arms. The four radiation arms are cross-arranged to form two orthogonally polarized dipoles. At least part of the outer body of at least one radiation arm is covered with the dielectric loading member.

[0009] In one embodiment, all four radiation arms are provided with the dielectric loading member.

[0010] In one embodiment, part of the outer body of all four radiation arms is covered with the dielectric loading member; or the outer bodies of all four radiation arms are completely covered with the dielectric loading member.

[0011] In one embodiment, at least two of the dielectric loading members are provided on one of the radiation arms, and two adjacent dielectric loading members are spaced apart.

[0012] In one embodiment, among two adjacent dielectric loading members on one radiation arm, one of the dielectric loading members scatters a second scattered signal and irradiates it onto another dielectric loading member to scatter a third scattered signal, and the phases of the first scattered signal, the second scattered signal, and the third scattered signal are different from each other, so that the first scattered signal, the second scattered signal, and the third scattered signal weaken or cancel each other in space.

[0013] In one embodiment, in one of the radiation arms, the center-to-center distance between two adjacent dielectric loading members is λ / 8 to λ / 4, where λ is the center frequency point wavelength of the high-frequency oscillator.

[0014] In one embodiment, the dielectric constant of the dielectric loading member is greater than 5 F / m.

[0015] On the other hand, a multi-band antenna is provided, including a high-frequency oscillator, a reflector, and the low-frequency oscillator as described above, and both the high-frequency oscillator and the low-frequency oscillator are fixedly provided on the reflector.

[0016] In one embodiment, the operating frequency band of the high-frequency oscillator is 3300 MHz to 3800 MHz; the operating frequency band of the low-frequency oscillator is 698 MHz to 960 MHz.

[0017] For the multi-band antenna and the low-frequency oscillator in the above embodiments, when the high-frequency signal radiated by the high-frequency oscillator located below passes through the radiation arm and the dielectric loading member of the low-frequency oscillator, scattered signals that weaken or cancel each other can be generated, thereby reducing the radar cross-section value of the low-frequency oscillator in the operating frequency band of the high-frequency oscillator. This can not only avoid the deterioration of port isolation, but also suppress the influence of the low-frequency oscillator on the radiation pattern of the high-frequency oscillator, and further improve the radiation pattern of the high-frequency oscillator, avoid the distortion of the radiation pattern of the high-frequency oscillator, and ensure the radiation performance of the multi-band antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 Schematic structural diagram of a multi-band antenna for an embodiment;

[0021] Figure 2 For Figure 1 Scattering schematic diagram of high-frequency signals by the low-frequency oscillator of the multi-band antenna of

[0022] Figure 3 For Figure 2 Schematic structural diagram of an embodiment of the low-frequency oscillator of

[0023] Figure 4 For Figure 2 Schematic structural diagram of another embodiment of the low-frequency oscillator of

[0024] Figure 5 For the traditional low-frequency oscillator and Figure 2 Comparison diagram of the RCS of the low-frequency oscillator of changing with frequency;

[0025] Figure 6 Pattern of the high-frequency oscillator when the traditional low-frequency oscillator and the high-frequency oscillator are combined;

[0026] Figure 7 For Figure 2 Pattern of the high-frequency oscillator when the low-frequency oscillator of and the high-frequency oscillator are combined;

[0027] Figure 8 For Figure 2 Port standing wave diagram when the low-frequency oscillator of and the high-frequency oscillator are combined.

[0028] Explanation of reference numerals:

[0029] 100, low-frequency oscillator; 110, radiation arm; 120, dielectric loading member; 200, high-frequency oscillator; 300, reflector. Detailed implementation manners

[0030] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0031] As Figure 1 shown, in one embodiment, a multi-band antenna is provided, which includes a high-frequency oscillator 200, a low-frequency oscillator 100, and a reflector 300. Among them, both the high-frequency oscillator 200 and the low-frequency oscillator 100 are fixedly arranged on the reflector 300 by means of plugging or clamping, etc., so that the multi-band antenna can radiate high-frequency signals and low-frequency signals externally.

[0032] Among them, the high-frequency oscillator 200 can be an existing oscillator structure and can radiate high-frequency signals.

[0033] Optionally, the operating frequency band of the high-frequency oscillator 200 can be 3300 MHz to 3800 MHz, that is, the high-frequency oscillator 200 can radiate signals with a frequency of 3300 MHz to 3800 MHz externally.

[0034] Optionally, the operating frequency band of the low-frequency oscillator 100 can be 698 MHz to 960 MHz, that is, the low-frequency oscillator 100 can radiate signals with a frequency of 698 MHz to 960 MHz externally.

[0035] As Figure 1 shown, in the actual use process, there can be at least two high-frequency oscillators 200, and the at least two high-frequency oscillators 200 are arranged in an array on the reflector 300; there can also be at least two low-frequency oscillators 100, and the at least two low-frequency oscillators 100 are arranged in an array on the reflector 300; and the high-frequency oscillators 200 and the low-frequency oscillators 100 are arranged in a staggered manner; at the same time, the high-frequency oscillators 200 are located below the radiation arms 110 of the low-frequency oscillators 100.

[0036] It should be noted that when the multi-band antenna is in use, components such as a power distribution network are also required. Since it can belong to the prior art, it will not be elaborated here.

[0037] As Figures 2 to 4 shown, in one embodiment, a low-frequency oscillator 100 is provided, and the low-frequency oscillator 100 includes a radiation arm 110 and a dielectric loading member 120.

[0038] Among them, the dielectric loading member 120 covers at least part of the outer arm of the radiation arm 110, that is, the entire radiation arm 110 is covered by the dielectric loading member 120 or only part of the radiation arm 110 is covered by the dielectric loading member 120. And when the high-frequency signal radiated by the high-frequency oscillator 200 located below (such as Figure 2When passing through the radiation arm 110 and the dielectric loading member 120 of the low-frequency oscillator 100 (as shown by S0), the scattered signals that can weaken or cancel each other can be generated, thereby reducing the Radar Cross section (RCS) value of the low-frequency oscillator 100 in the operating frequency band of the high-frequency oscillator 200. This can not only avoid the deterioration of port isolation, but also suppress the influence of the low-frequency oscillator 100 on the radiation pattern of the high-frequency oscillator 200, thereby improving the radiation pattern of the high-frequency oscillator 200, avoiding the distortion of the radiation pattern of the high-frequency oscillator 200, and ensuring the radiation performance of the multi-band antenna.

[0039] Specifically, when the high-frequency signal (such as Figure 2 shown by S0) radiated by the high-frequency oscillator 200 located below is coupled to the radiation arm 110 and the dielectric loading member 120 of the low-frequency oscillator 100, the radiation arm 110 can generate a first scattered signal (such as Figure 2 shown by S1), and the dielectric loading member 120 can generate a second scattered signal (such as Figure 2 shown by S2). That is, when the high-frequency signal radiated by the high-frequency oscillator 200 irradiates on the radiation arm 110, the first scattered signal is scattered, and when the high-frequency signal radiated by the high-frequency oscillator 200 irradiates on the dielectric loading member 120, the second scattered signal is scattered. At the same time, the phases of the first scattered signal and the second scattered signal are different from each other, so that the first scattered signal and the second scattered signal can be superimposed on each other in space to weaken or cancel each other, thereby reducing the Radar Cross section (RCS) value of the low-frequency oscillator 100 in the operating frequency band of the high-frequency oscillator 200. This can not only avoid the deterioration of port isolation, but also suppress the influence of the low-frequency oscillator 100 on the radiation pattern of the high-frequency oscillator 200, thereby improving the radiation pattern of the high-frequency oscillator 200, avoiding the distortion of the radiation pattern of the high-frequency oscillator 200, and ensuring the radiation performance of the multi-band antenna.

[0040] Among them, the radiation arm 110 can be made of materials suitable for multi-band antennas such as aluminum. The cross-sectional profile of the radiation arm 110 can be square, rectangular, circular, polygonal or other irregular shapes, which are not limited here.

[0041] Among them, the dielectric loading member 120 can be made of insulating materials such as ceramics. And, the cross-sectional profile of the dielectric loading member 120 can be square, rectangular, circular, polygonal or other irregular shapes, as long as the dielectric loading member 120 can wrap at least part of the radiation arm 110.

[0042] In addition, in order to ensure that the second scattering signal scattered by the dielectric loading member 120 can be superimposed with the first scattering signal scattered by the radiation arm 110 in space to weaken or cancel each other, the dielectric constant of the dielectric loading member 120 can be selected to be relatively large. For example, the dielectric constant of the dielectric loading member 120 is greater than 5 F / m, so that the second scattering signal scattered by the dielectric loading member 120 is stronger, and then the second scattering signal can be superimposed with the first scattering signal in space to weaken or cancel each other, and the weakening effect or cancellation effect is good.

[0043] Among them, the dielectric constant of the dielectric loading member 120 can be 6 F / m, 7 F / m, 8 F / m or larger, and can be flexibly adjusted or designed according to actual use requirements.

[0044] It should be noted that the low-frequency oscillator 100 further includes a feeding balun (not shown). One side of the feeding balun is connected to the reflector 300 by means of plugging or clamping, etc., and the other side of the feeding balun is coupled to the radiation arm 110, so as to feed the radiation arm 110 by using the feeding balun, so that the signal can be transmitted to the radiation arm 110 and then radiated out.

[0045] Among them, the feeding balun can adopt any existing feeding form, for example, it can be a microstrip line structure.

[0046] Such as Figure 3 and Figure 4 As shown, in a specific embodiment, the low-frequency oscillator 100 includes four radiation arms 110. Among them, the four radiation arms 110 are arranged in a cross shape, so that the four radiation arms 110 form two dipoles with orthogonal polarizations. And, at least part of the arm body of at least one radiation arm 110 is coated with a dielectric loading member 120. When the high-frequency signal radiated by the high-frequency oscillator 200 below is radiated to the four radiation arms 110 and the dielectric loading member 120, the four radiation arms 110 can all scatter the first scattering signal, and the dielectric loading member 120 can scatter the second scattering signal. At the same time, the phase of the first scattering signal is different from the phase of the second scattering signal, so that the first scattering signal and the second scattering signal can be superimposed with each other in space to weaken or cancel each other, and then the radar cross-section value of the low-frequency oscillator 100 in the working frequency band of the high-frequency oscillator 200 is reduced. It can not only avoid the deterioration of port isolation, but also suppress the influence of the low-frequency oscillator 100 on the radiation pattern of the high-frequency oscillator 200, and then improve the radiation pattern of the high-frequency oscillator 200, avoid the distortion of the radiation pattern of the high-frequency oscillator 200, and ensure the radiation performance of the multi-band antenna.

[0047] Preferably, the four radiation arms 110 are all provided with dielectric loading members 120, so that the first scattering signal and the second scattering signal can be better superimposed with each other in space to weaken or cancel each other.

[0048] As Figure 3 shown, in one embodiment, each of the four radiating arms 110 is partially covered with a dielectric loading member 120 outside the arm body, that is, a part of each radiating arm 110 is covered by the dielectric loading member 120. As Figure 4 shown, of course, in other embodiments, it may also be that each of the four radiating arms 110 is completely covered with a dielectric loading member 120 outside the arm body. In this way, it is convenient to process the dielectric loading member 120 and also convenient to assemble the dielectric loading member 120 onto the radiating arm 110.

[0049] As Figure 3 shown, in one embodiment, at least two dielectric loading members 120 are provided on one radiating arm 110, and moreover, the adjacent two dielectric loading members 120 are spaced apart, that is, at least two mutually spaced dielectric loading members 120 are covered on one radiating arm 110. With such a setting, when the high-frequency signal radiated by the high-frequency oscillator 200 located below radiates to the radiating arm 110 and the at least two dielectric loading members 120 covered on the radiating arm 110, the radiating arm 110 can scatter a first scattered signal, and each of the at least two dielectric loading members 120 covered on the radiating arm 110 can scatter a second scattered signal, so that the second scattered signal is strong enough. Considering that the phase of the first scattered signal is different from the phase of the second scattered signal, the first scattered signal and the second scattered signal can be fully superimposed and weakened or canceled in space, and the weakening effect or cancellation effect is good.

[0050] Further, in two dielectric loading members 120 adjacent to a radiation arm 110, a second scattered signal scattered by one of the dielectric loading members 120 can be radiated onto the other adjacent dielectric loading member 120, so as to scatter a third scattered signal on the other adjacent dielectric loading member 120. Moreover, the phases of the first scattered signal, the second scattered signal, and the third scattered signal are different from each other, so that the first scattered signal, the second scattered signal, and the third scattered signal can be fully superimposed and weakened or cancelled in space, further strengthening the weakening effect or the cancellation effect, and further reducing the Radar Cross-section (RCS) value of the low-frequency oscillator 100 in the operating frequency band of the high-frequency oscillator 200, better avoiding the deterioration of port isolation, and better suppressing the influence of the low-frequency oscillator 100 on the radiation pattern of the high-frequency oscillator 200, thereby effectively improving the radiation pattern of the high-frequency oscillator 200, avoiding the distortion of the radiation pattern of the high-frequency oscillator 200, and ensuring the radiation performance of the multi-band antenna. At the same time, in a radiation arm 110, the second scattered signals scattered by two adjacent dielectric loading members 120 can further scatter each other to generate a third scattered signal, so that the phase difference between the third scattered signal and the first scattered signal is larger, and thus the third scattered signal can be better superimposed and weakened or cancelled with the first scattered signal in space, strengthening the weakening effect or the cancellation effect.

[0051] In addition, in a radiation arm 110, the center distance between two adjacent dielectric loading members 120 (such as Figure 3 shown by L) is λ / 8 to λ / 4, where λ is the center frequency point wavelength of the high-frequency oscillator 200. With such a setting, not only can the first scattered signal scattered by the radiation arm 110 and the second scattered signals that can be scattered by each dielectric loading member be superimposed and weakened or cancelled in space, but also a third scattered signal can be further scattered between two adjacent dielectric loading members 120, so that the first scattered signal, the second scattered signal, and the third scattered signal can be superimposed and weakened or cancelled in space, and the weakening effect or the cancellation effect is better.

[0052] Wherein, the center distance between two adjacent dielectric loading members 120 refers to the distance between the central cross-sections of two adjacent dielectric loading members 120 in a radiation arm 110. Moreover, the center distance between two adjacent dielectric loading members 120 can be λ / 8, λ / 7, λ / 6, λ / 5, or λ / 4, and can be flexibly adjusted or designed according to actual usage requirements.

[0053] As Figure 5 shown, compared with the traditional low-frequency oscillator 100, the low-frequency oscillator 100 in any of the above embodiments can significantly improve the scattering suppression index value of the high-frequency oscillator 200. As Figure 6As shown, when the traditional low-frequency oscillator 100 and the high-frequency oscillator 200 are used in combination, the high-frequency oscillator 200 has large beam fluctuations within the horizontal plane ±60° angular range, and the half-power beam width range within the 3.3 GHz to 3.8 GHz frequency band is 86.92° to 108.02°, which is relatively discrete. As Figure 7 As shown, when the low-frequency oscillator 100 and the high-frequency oscillator 200 of any of the above embodiments are used in combination, the high-frequency oscillator 200 has relatively small fluctuations within the horizontal plane ±60° angular range, and the half-power beam width range within the 3.3 GHz to 3.8 GHz frequency band is 92.04° to 96.64°, which is relatively convergent, and the pattern performance of the high-frequency oscillator 200 is significantly improved. As Figure 8 As shown, in addition, after the low-frequency oscillator 100 and the high-frequency oscillator 200 of any of the above embodiments are used in combination, the standing wave of the low-frequency oscillator 100 within the working frequency band is less than 1.6.

[0054] It should be noted that "a certain body" and "a certain part" can be a part of the corresponding "component", that is, "a certain body" and "a certain part" are integrally formed with the "other parts of the component"; or they can be an independent component separable from the "other parts of the component", that is, "a certain body" and "a certain part" can be independently manufactured and then combined with the "other parts of the component" into a whole. The expression of "a certain body" and "a certain part" in this application is only one embodiment for the convenience of reading, rather than a limitation on the protection scope of this application. As long as the above features are included and the functions are the same, it should be understood as an equivalent technical solution of this application.

[0055] It should be noted that the components included in the "unit", "component", "mechanism", and "device" of this application can also be flexibly combined, that is, modular production can be carried out according to actual needs to facilitate modular assembly. The division of the above components in this application is only one embodiment for the convenience of reading, rather than a limitation on the protection scope of this application. As long as the above components are included and the functions are the same, it should be understood as an equivalent technical solution of this application.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present invention. The term "and / or" used in the present invention includes any and all combinations of one or more of the related listed items.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0060] It should be noted that when an element is referred to as being "fixed to", "arranged on", "secured to" or "mounted on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. Further, when an element is considered to be "fixedly drivingly connected" to another element, the two may be fixed in a detachable connection manner or a non-detachable connection manner, as long as power transmission can be achieved, such as socket connection, snap connection, integrally formed fixing, welding, etc., which can be achieved in the prior art and will not be elaborated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is perpendicular, but due to manufacturing and assembly effects, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0061] It should also be understood that when interpreting the connection relationship or positional relationship of components, although not explicitly described, the connection relationship and positional relationship are interpreted to include an error range, and this error range should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "about", "approximate" or "substantially" can mean within one or more standard deviations, which is not defined herein.

[0062] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0063] The above embodiments only express several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be understood as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A low-frequency oscillator, characterized in that, The low-frequency oscillator includes a radiation arm and a dielectric loading member, and the dielectric loading member covers at least a part of the outer surface of the radiation arm; moreover, when a high-frequency signal passes through, the dielectric loading member and the radiation arm can generate scattering signals that weaken or cancel each other. When the high-frequency signal is coupled to the radiation arm and the dielectric loading member, the radiation arm generates a first scattering signal, and the dielectric loading member generates a second scattering signal. The phase of the first scattering signal is different from the phase of the second scattering signal, so that the first scattering signal and the second scattering signal weaken or cancel each other in space.

2. The low-frequency oscillator according to claim 1, characterized in that, The low-frequency oscillator includes four radiation arms. The four radiation arms are arranged crosswise to form two dipoles with orthogonal polarizations, and at least a part of the outer surface of at least one radiation arm is covered with the dielectric loading member.

3. The low-frequency oscillator according to claim 2, wherein, The dielectric loading member is provided on all four radiation arms.

4. The low-frequency oscillator according to claim 3, wherein, The outer surface of a part of each of the four radiation arms is covered with the dielectric loading member; or the outer surface of each of the four radiation arms is completely covered with the dielectric loading member.

5. The low-frequency oscillator according to claim 1, characterized in that At least two dielectric loading members are provided on one radiation arm, and the adjacent two dielectric loading members are spaced apart.

6. The low-frequency oscillator according to claim 5, characterized in that Among two adjacent dielectric loading members on one radiation arm, one dielectric loading member scatters a second scattering signal and irradiates it onto the other dielectric loading member to scatter a third scattering signal. The phase of the first scattering signal, the phase of the second scattering signal, and the phase of the third scattering signal are different from each other, so that the first scattering signal, the second scattering signal, and the third scattering signal weaken or cancel each other in space.

7. The low-frequency oscillator according to claim 5, characterized in that, In one radiation arm, the center distance between two adjacent dielectric loading members is λ / 8 to λ / 4, where λ is the center frequency point wavelength of the high-frequency oscillator.

8. The low-frequency oscillator according to any one of claims 1 to 7, characterized in that, The dielectric constant of the dielectric loading member is greater than 5 F / m.

9. A multi-band antenna, characterized in that, It includes a high-frequency oscillator, a reflector, and the low-frequency oscillator according to any one of claims 1 to 8. The high-frequency oscillator and the low-frequency oscillator are both fixed on the reflector.

10. The multi-band antenna according to claim 9, wherein, The operating frequency band of the high-frequency oscillator is 3300 MHz to 3800 MHz; the operating frequency band of the low-frequency oscillator is 698 MHz to 960 MHz.

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