A Ultra-Wideband Monopole Omnidirectional Antenna

Abstract

A ultra-wideband monopole omnidirectional antenna, comprising: a base, above which an oscillator plate is installed; copper sheets, symmetrically bent and arranged on the left and right sides of the oscillator plate, and the copper sheets are provided with reflecting surfaces, the forward projection of the reflecting surfaces falls on the oscillator plate; a copper wire, one end of the copper wire is connected to the reflecting surface, and the other end of the copper wire is detachably connected to the oscillator plate. Two copper sheets are arranged on the oscillator plate, and the two copper sheets are symmetrically arranged on both sides of the oscillator plate. The length of the oscillator plate is extended by the copper sheets, so as to ensure that the antenna has a larger bandwidth. At this time, the two copper sheets are bent inward, so as to reduce the space occupied by the copper sheets in the antenna, thereby realizing the adjustment of the frequency.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to an ultra-wideband monopole omnidirectional antenna. Background Art

[0002] Communication technologies in complex application environments such as vehicle-mounted systems, drones, unmanned patrol vehicles, or robots face a series of unique challenges. These devices often need to operate stably under changing physical conditions while ensuring high-speed data transmission and reception quality. Due to the intricate usage environment, signal interference and attenuation problems frequently occur, so antennas with a larger bandwidth are required to meet the stringent demands of communication work. However, the traditional solution is to increase the volume of the antenna to expand the bandwidth. Although this approach is effective to a certain extent, it brings new problems.

[0003] Specifically, antennas with a larger volume will significantly compress the valuable space inside the device during installation. For devices with extremely limited space, this undoubtedly exacerbates the difficulty and complexity of installation. In vehicle-mounted systems, this may limit the layout of other key components; on small aircraft such as drones, it may affect flight performance such as flight stability and endurance due to the increase in weight and volume. To accommodate these large antennas, manufacturers often have to expand the overall installation space of the device, which not only means an increase in the volume of the device but also directly leads to a soaring manufacturing cost.

[0004] It is particularly noteworthy that in small devices such as drones that are highly integrated and extremely sensitive to weight, the increase in the volume of the antenna may become an unacceptable burden. It may force designers to sacrifice other important performance parameters such as payload capacity, flight speed, or stealth to meet the requirements of antenna installation. Therefore, there is an urgent need in the industry for an antenna that is small in size, light in weight, and has ultra-wideband characteristics to meet the communication requirements in complex environments without sacrificing the performance of the device. Summary of the Invention

[0005] Aiming at the above defects, the purpose of the present invention is to propose an ultra-wideband monopole omnidirectional antenna that can increase its bandwidth while maintaining a relatively small volume.

[0006] To achieve this purpose, the present invention adopts the following technical solutions: An ultra-wideband monopole omnidirectional antenna, comprising:

[0007] A base, above which an oscillator plate is installed;

[0008] Two copper sheets, symmetrically bent and arranged on the left and right sides of the oscillator plate, and the copper sheets are provided with reflecting surfaces. The reflecting surfaces of the two copper sheets are respectively arranged on the front and back of the oscillator plate, and the forward projection of the reflecting surface falls on the oscillator plate;

[0009] A copper wire, one end of the copper wire is connected to the reflecting surface, and the other end of the copper wire is detachably connected to the oscillator plate.

[0010] Preferably, the copper sheet further includes a mounting portion and a transition portion. The mounting portion is fixed to the edge of one end face of the oscillator plate through a fixing member. The mounting portion is connected to the transition portion at the side edge of the oscillator plate. The transition portion is connected to the reflecting surface at the other side of the oscillator plate.

[0011] Preferably, the reflecting surface includes a coincidence portion, and the coincidence portion is the portion where the orthographic projections of two reflecting surfaces on the oscillator plate coincide;

[0012] The copper wire is connected to the coincidence portion.

[0013] Preferably, the width of the coincidence portion is X, and the acquisition formula of X is as follows:

[0014] ;

[0015] ;

[0016] where d is the linear distance between two reflecting surfaces, is the dielectric constant, j is the imaginary unit, f is the required adjustment frequency, L is the height of the reflecting surface, is the linear length between the transition portion and the reflecting surface, and D is the width of the oscillator plate.

[0017] Preferably, a plurality of welding points are arranged along the height direction of the coincidence portion, and one end of the copper wire is fixed to the welding point.

[0018] Preferably, it further includes a support plate. The support plate is fixed to the edge of the oscillator plate, and the outer contour of the support plate fits with the inner contour of the combination of the transition portion and the reflecting surface. The support plate is fixedly connected to the inner side of the copper sheet.

[0019] Preferably, it further includes a damper. One end of the damper is fixed to the fixing member, and the other end of the damper is fixed to the surface of the support plate facing the oscillator plate;

[0020] Taking the inner contact point of the transition portion and the oscillator plate as the first end point, and taking the contact point of the transition portion and the reflecting surface as the second end point, making the connection line of the first end point and the second end point as the reference line, the length direction of the damper is horizontally arranged with the length direction of the reference line.

[0021] Preferably, the surface of the oscillator plate is coated with solder mask green oil;

[0022] The oscillator plate is also provided with two slots, which are symmetrically arranged along the solder mask green oil. The slots are located below the copper sheets, and the length direction of the slots is consistent with the height direction of the oscillator plate;

[0023] The width e of the slot is smaller than the width E of the oscillator plate beside the slot.

[0024] Preferably, the cross-section of the slot is in an I shape.

[0025] Preferably, it further includes a housing, which is detachably connected to the base and wraps the oscillator plate and the copper sheets inside the housing.

[0026] One of the above technical solutions has the following advantages or beneficial effects: 1. Two copper sheets are arranged on the oscillator plate, and the two copper sheets are symmetrically arranged on both sides of the oscillator plate. The length of the oscillator plate is extended through the copper sheets, so as to ensure that the antenna has a larger bandwidth. At this time, the two copper sheets are bent inward, so as to reduce the space occupied by the copper sheets in the antenna, thereby realizing the adjustment of the frequency.

[0027] 2. Users can control the length of the copper wire according to their own needs, so as to adjust the inductance distribution on the oscillator plate, thereby canceling the inductance on the copper sheet, so that low-frequency signals can pass through or be received. When filtering of low-frequency signals is required, the copper wire on the oscillator plate can be disassembled to realize the filtering of low-frequency signals. The adaptability of the antenna is greatly improved, the design of an ultra-wideband miniaturized antenna is realized, the burden on the device is reduced, and it is especially suitable for small devices such as drones that are sensitive to weight. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of an embodiment of the present invention.

[0029] Figure 2 is a structural sectional view of another embodiment of the present invention.

[0030] Figure 3 is a top view of another embodiment of the present invention.

[0031] Wherein: base 1,

[0032] copper sheet 2, reflecting surface 21, overlapping part 211, transition part 22, mounting part 23,

[0033] copper wire 3, fixing part 4, welding point 5, support plate 6, damper 7, slot 8, housing 9, reference line 10, oscillator plate 11. Detailed Embodiments

[0034] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for 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 thus should not be construed as limiting the present invention.

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. 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.

[0038] As Figures 1 to 3 shown, a ultra-wideband monopole omnidirectional antenna includes:

[0039] A base 1, and an oscillator plate 11 is mounted above the base 1;

[0040] Two copper sheets 2, which are symmetrically bent and arranged on the left and right sides of the oscillator plate 11, and the copper sheets 2 are provided with reflection surfaces 21. The reflection surfaces 21 of the two copper sheets 2 are respectively arranged on the front and back sides of the oscillator plate 11, and the forward projection of the reflection surface 21 falls on the oscillator plate 11;

[0041] A copper wire 3, one end of the copper wire 3 is connected to the reflection surface 21, and the other end of the copper wire 3 is detachably connected to the oscillator plate 11.

[0042] The traditional solution is to increase the volume of the antenna to expand the bandwidth. However, in some highly integrated devices, it is difficult to increase the volume of the antenna. Therefore, in the present invention, two copper sheets 2 are provided on the oscillator plate 11. The two copper sheets 2 are symmetrically arranged on both sides of the oscillator plate 11. The length of the oscillator plate 11 is extended by the copper sheets 2, so as to ensure that the antenna has a relatively large bandwidth. Whether to set components such as oscillators on the copper sheets 2 can be determined according to the tuned frequency. The copper sheets 2 are arranged in a bent manner, and the forward projection of the reflecting surface 21 falls on the oscillator plate 11. At this time, the two copper sheets 2 are bent inward, so as to reduce the space occupied by the copper sheets 2 in the antenna, thereby realizing the adjustment of the frequency. However, due to the addition of the copper sheets 2 and the bent arrangement of the copper sheets 2. At the same time, the copper sheet 2 on the oscillator plate 11 is equivalent to one plate of a parallel plate capacitor, forming a capacitance with the other copper sheet 2, and the capacitance has a filtering effect, thereby improving the overall communication quality of the antenna. However, the increase in capacitance will cause the resonant frequency formed by each component on the oscillator plate 11 to decrease. When low-frequency signal transmission is required, the higher capacitance will make it difficult for low-frequency signals to pass through, so that the antenna cannot achieve the effect of ultra-wideband. Therefore, in the present invention, the reflecting surface 21 and the inductance element on the oscillator plate 11 are connected by a copper wire 3. The copper wire 3 itself has a certain inductance. When the copper wire 3 is connected to the inductance element on the oscillator plate 11, the inductance on the copper wire 3 may interact with other inductance elements on the oscillator plate 11, or change the overall inductance distribution of the oscillator plate 11. The user can control the length of the copper wire 3 according to his own needs, so as to adjust the inductance distribution on the oscillator plate 11, thereby offsetting the inductance on the copper sheet 2, so that low-frequency signals can pass through or be received. When low-frequency signal filtering is required, the copper wire 3 on the oscillator plate 11 can be disassembled to realize low-frequency signal filtering. The adaptability of the antenna is greatly improved, the design of an ultra-wideband miniaturized antenna is realized, the burden on the device is reduced, and it is especially suitable for small devices such as drones that are sensitive to weight.

[0043] Preferably, the copper sheet 2 further includes a mounting portion 23 and a transition portion 22. The mounting portion 23 is fixed to the edge of one end face of the oscillator plate 11 through a fixing member 4. The mounting portion 23 is connected to the transition portion 22 at the side edge of the oscillator plate 11. The transition portion 22 is connected to the reflecting surface 21 on the other side of the oscillator plate 11.

[0044] In the present invention, the electrical traces on the oscillator plate 11 can extend from the outer side surface of the mounting portion 23 to the outer side surface of the transition portion 22, and finally extend to the outer side surface of the reflecting surface 21. The path of the outer side surface is longer than the path length of the inner side surface, further increasing the extension length of the oscillator plate 11.

[0045] Meanwhile, the copper sheet 2 is installed by this installation method. Part of the edge of the transition part 22 can abut against the side edge of the oscillator plate 11, so that the oscillator plate 11 provides a supporting force in the X direction for the copper sheet 2, making the copper sheet 2 more stable when resisting the force in the X direction.

[0046] Preferably, the reflecting surface 21 includes a coincident part 211, and the coincident part 211 is the part where the positive projections of the two reflecting surfaces 21 on the oscillator plate 11 coincide;

[0047] The copper wire 3 is connected to the coincident part 211.

[0048] Since the influence of the copper sheet 2 on the capacitance is the greatest at the coincident part 211, the copper wire 3 is arranged here to eliminate the capacitance generated by the copper sheet 2, enabling the low-frequency signal to pass through.

[0049] Preferably, the width of the coincident part 211 is X, and the acquisition formula of X is as follows:

[0050] ;

[0051] ;

[0052] where d is the straight-line distance between the two reflecting surfaces 21, is the dielectric constant, j is the imaginary unit, f is the required adjustment frequency, L is the height of the reflecting surface 21, is the straight-line length of the transition part 22 and the reflecting surface 21, and D is the width of the oscillator plate 11.

[0053] Preferably, a plurality of welding points 5 are arranged along the height direction of the coincident part 211, and one end of the copper wire 3 is fixed to the welding point 5.

[0054] Since different lengths of the copper wire 3 will have different effects on the overall inductance distribution of the oscillator plate 11, users can determine the position where the copper wire 3 is welded to the welding point 5 according to the size specifications of their own oscillator plate 11, so as to meet the communication requirements.

[0055] Preferably, it further includes a support plate 6. The support plate 6 is fixed to the edge of the oscillator plate 11, and the outer contour of the support plate 6 fits with the inner contour of the combination of the transition part 22 and the reflecting surface 21. The support plate 6 is fixedly connected to the inner side of the copper sheet 2.

[0056] When the antenna is used on dynamic devices such as drones, the antenna will shake due to the movement of the device. At this time, the copper sheet 2 may shake or deform, ultimately affecting the frequency of the antenna. If this problem needs to be solved, the thickness of the copper sheet 2 needs to be increased, but the cost of this method is relatively high. Therefore, in the present invention, the support plate 6 is made of fiberglass epoxy resin substrate, which has excellent mechanical strength and can provide support for the copper sheet 2, so that the copper sheet 2 will not deform when subjected to external forces. The electrical pattern of the copper sheet 2 is located on the outside, and the support plate 6 is located inside the copper sheet 2 for support, which will not affect the electrical pattern of the copper wire 3, greatly improving the practicability of the antenna.

[0057] Preferably, a damper 7 is further included. One end of the damper 7 is fixed to the fixing member 4, and the other end of the damper 7 is fixed to the surface of the support plate 6 facing the oscillator plate 11.

[0058] Taking the inner contact point of the transition portion 22 and the oscillator plate 11 as the first end point and the contact point of the transition portion 22 and the reflecting surface 21 as the second end point, the connecting line of the first end point and the second end point is used as the reference line 10, and the length direction of the damper 7 is horizontally arranged with the length direction of the reference line 10.

[0059] Since the addition of the support plate 6 increases the mechanical strength of the copper sheet 2, making it not deform when subjected to external forces, but due to cost and space limitations, the thickness of the support plate 6 will not be too thick, and its shape is the same as the inner contour of the combination of the transition portion 22 and the reflecting surface 21, which is a bent shape. When subjected to external forces in the Y direction, it will still shake. During the shaking process, the mass distribution of the copper sheets 2 on the left and right sides of the oscillator plate 11 is uneven in the clockwise direction, thus destroying the symmetry of the oscillator plate 11 and possibly exciting higher-order vibration modes, thereby affecting the frequency. Therefore, in the present invention, a damper 7 is provided to offset the external force in the Y direction through the damper 7, so that the posture of the copper sheet 2 can be kept consistent. Due to the shape of the copper sheet 2, when subjected to external forces, the reflecting surface 21 mainly shakes towards the transition portion 22. Therefore, the length direction of the damper 7 is horizontally arranged with the length direction of the reference line 10. At this time, the movement direction of the damper 7 is the same as the force direction of the copper sheet 2, better preventing the copper sheet 2 from shaking.

[0060] It is worth mentioning that the fixing member 4 can be a combination of a bolt and a nut, etc., and one end of the damper 7 is fixed to the fixing member 4, which can avoid setting additional space for connecting the damper 7 on the oscillator plate 11, thus ensuring that the antenna can maintain a relatively small volume.

[0061] Preferably, the surface of the oscillator plate 11 is coated with solder mask green oil, and the solder mask green oil can play a role in rust prevention and corrosion prevention, thereby improving the service life of the oscillator plate 11.

[0062] The oscillator plate 11 is also provided with two slots 8, which are symmetrically arranged along the solder mask green oil. The slots 8 are located below the copper sheet 2, and the length direction of the slots 8 is the same as the height direction of the oscillator plate 11.

[0063] The width e of the slot 8 is smaller than the width E of the oscillator plate 11 beside the slot 8.

[0064] The slot 8 can be regarded as an impedance discontinuity point on the transmission line, and the user can adjust the length of the slot 8 according to their own filtering requirements. At this time, the slot 8 will introduce a shunt reactance at a specific frequency point, resulting in impedance mismatch. The impedance mismatch will cause the signal to be reflected at the slot 8 instead of radiating into the free space, thereby filtering out the frequency component and achieving the filtering effect.

[0065] In addition, since devices such as the support plate 6, the copper sheet 2, and the damper 7 are installed on the oscillator plate 11, the weight above the oscillator plate 11 is greater than the weight below. The center of gravity of the oscillator plate 11 is displaced upward as a whole, which weakens the ability of the lower part of the oscillator plate 11 to resist tipping. When subjected to an external force, it may cause the lower part of the oscillator plate 11 to break. The setting of the slot 8 can change the lower part of the oscillator plate 11 from a single support point to multiple stress-bearing points, reduce local stress concentration, and reduce single-point failure, thereby triggering the risk of the oscillator plate 11 breaking.

[0066] Preferably, the cross-section of the slot 8 is in an I shape.

[0067] The upper and lower horizontal parts of the flange of the I shape distribute the material at a position far from the neutral axis, significantly increasing the moment of inertia. The bending stress is inversely proportional to the cross-sectional moment of inertia, which can greatly enhance the bending resistance of the lower part of the oscillator plate 11.

[0068] Preferably, it further includes a housing 9, which is detachably connected to the base 1 and wraps the oscillator plate 11 and the copper sheet 2 inside the housing 9.

[0069] The important components of the antenna are wrapped and protected by the housing 9 to reduce the influence of the internal components of the device on the antenna components.

[0070] In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0071] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An ultra-wideband monopole omnidirectional antenna, characterized in that: include: A base, with a vibrator plate installed on the top of the base; Two copper sheets are bent and symmetrically arranged on the left and right sides of the vibrator plate, and the copper sheets are provided with reflective surfaces, the reflective surfaces of the two copper sheets are respectively arranged on the front and back sides of the vibrator plate, and the forward projection of the reflective surfaces falls on the vibrator plate, and the copper sheets also include a mounting portion and a transition portion, the mounting portion is fixed to an edge of an end surface of the vibrator plate by a fixing member, the mounting portion is connected to the transition portion at the side edge of the vibrator plate, and the transition portion is connected to the reflective surface at the other side of the vibrator plate; The reflecting surface includes an overlapping portion, and the overlapping portion is a portion where the orthographic projections of the two reflecting surfaces on the vibrator plate overlap; A copper wire, one end of which is connected to the reflecting surface, and the other end of which is detachably connected to the vibrator plate; The copper wire is connected to the overlapping portion; The overlapping portion is provided with a plurality of welding points along the height direction, and one end of the copper wire is fixed to the welding point.

2. The ultra-wideband monopole omnidirectional antenna according to claim 1, characterized in that: The width of the overlapped portion is X, where the formula for obtaining X is as follows: ； ； Where d is the straight-line distance between the two reflecting surfaces, is the dielectric constant, j is the imaginary unit, f is the required adjustment frequency, L is the height of the reflecting surface, is the straight line length between the transition part and the reflecting surface, and D is the width of the oscillator plate.

3. The ultra-wideband monopole omnidirectional antenna according to claim 1, characterized in that: It also includes a support plate, which is fixed to the edge of the vibrator plate, and the outer contour of the support plate fits the inner contour of the combination of the transition part and the reflective surface, and the support plate is fixedly connected to the inner side of the copper sheet.

4. The ultra-wideband monopole omnidirectional antenna according to claim 3, characterized in that: It also includes a damper, one end of which is fixed to the fixing member, and the other end of which is fixed to a side of the support plate facing the vibrator plate; The internal connection point between the transition part and the vibrator plate is taken as the first endpoint, the connection point between the transition part and the reflecting surface is taken as the second endpoint, and the line connecting the first endpoint and the second endpoint is taken as the reference line. The length direction of the damper is set horizontally with the length direction of the reference line.

5. The ultra-wideband monopole omnidirectional antenna according to claim 1 or 4, characterized in that: The surface of the vibrator plate is coated with solder resist green oil; The vibrator plate is further provided with two slots, the slots are symmetrically arranged along the solder resist green oil, the slots are located below the copper sheet, and the length direction of the slots is consistent with the height direction of the vibrator plate; The width e of the slot is smaller than the width E of the vibrator plate beside the slot.

6. The ultra-wideband monopole omnidirectional antenna according to claim 5, characterized in that: The cross section of the slot is I-shaped.

7. The ultra-wideband monopole omnidirectional antenna according to claim 1 or 4, characterized in that: It also includes a shell, which is detachably connected to the base, and the vibrator plate and the copper sheet are wrapped in the shell.

Images