Anti-interference ultra-wideband radiation unit and anti-interference ultra-wideband antenna

Abstract

The invention discloses an anti-interference ultra-wideband radiation unit and an anti-interference ultra-wideband antenna, and the radiation unit comprises a light guide sheet which is located above a radiation surface and is used for expanding the bandwidth; the radiating surface consists of four folded dipole radiating arms and is printed on a first substrate of which the dielectric constant is 4.4, the loss tangent is 0.005 and the thickness is 0.762 mm, and every two folded dipole radiating arms are connected together through a high-impedance lead; the balun comprises an inductance circuit and a capacitance circuit on the front surface and the back surface, the inductance circuit is arranged in a bending manner and is electrically conducted through a metalized via hole, the capacitance circuit performs energy coupling through a gap of the substrate thickness to form a gap capacitor, and the balun is connected with each folded dipole radiation arm and is used for providing broadband impedance matching; and the base is connected with the balun and is used for converting the feed type, so that the coaxial cable is welded in parallel to the base, the electromagnetic interference between different frequency bands can be effectively reduced, and the gain can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of communication antennas, and in particular to an anti-interference ultra-wideband radiation unit and an anti-interference ultra-wideband antenna. Background Art

[0002] With the increasing number of modern base station antennas, multi-band integrated antennas have become the mainstream trend of base station antennas today. The purpose of multi-band integrated antennas is to integrate multiple radiating units of different frequency bands into one antenna to reduce the number and volume of antennas and improve the utilization rate of sites. However, when radiating units of different operating frequencies are installed in the same antenna, due to the small spacing between them, strong coupling will occur between radiating units of different frequency bands, resulting in a serious deterioration in the isolation between systems of different frequency bands. This not only affects the performance of the antenna, but also increases the complexity and cost of the system.

[0003] In the prior art, in order to solve the above problems, the following methods are usually adopted: Increasing the distance between radiation units in different frequency bands: This method will increase the overall volume of the base station antenna, increase production costs, and does not meet the requirements of modern operators for antenna miniaturization.

[0004] Adding filters between different frequency bands: Although filters can improve isolation, their large size will increase the complexity of the internal structure of the antenna, which is not conducive to improving production efficiency.

[0005] Using half-wavelength dipoles for array formation: Although half-wavelength dipoles can achieve multi-band integration, they have disadvantages such as limited gain improvement and poor beam convergence. Using half-wavelength folded dipoles for array formation, although the beam convergence and gain performance are better under the radiation boundary conditions of the same size, its input impedance is high, making it difficult to achieve ultra-wideband matching, resulting in a narrow operating frequency band and difficulty in meeting the requirements of modern operators.

[0006] Therefore, it is necessary to design an ultra-wideband radiation unit that can reduce electromagnetic interference between different frequency bands and has high gain characteristics, so as to overcome the above-mentioned shortcomings of the prior art. Summary of the invention

[0007] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide an anti-interference ultra-wideband radiating unit that can effectively prevent the coupling current of other frequency bands from flowing to the balun of the radiating unit by introducing an LC resonant circuit, reduce inter-band interference, and improve the isolation of the system, which can effectively reduce the electromagnetic interference between different frequency bands and improve the gain.

[0008] In the first aspect, an embodiment of the present invention provides an anti-interference ultra-wideband radiation unit, including: a phase-inducing plate located above the radiation surface, for expanding the bandwidth; a radiation surface, composed of four folded dipole radiation arms, printed on a first substrate with a dielectric constant of 4.4, a loss tangent of 0.005, and a thickness of 0.762 mm, each folded dipole radiation arm is connected to each other through a high-impedance wire; a balun, including an inductor circuit and a capacitor circuit on the front and back sides, the inductor circuit is arranged in a bent manner and is electrically conductive through a metallized via, the capacitor circuit performs energy coupling through a gap in the thickness of the substrate to form a gap capacitor, the balun is connected to each of the folded dipole radiation arms, and is used to provide broadband impedance matching; a base, connected to the balun, is used to convert the feeding type, so that the coaxial cable is welded parallel to the base.

[0009] In some embodiments, the anti-interference ultra-wideband radiation unit also includes four parasitic plates, which are printed on the lower layer of the first substrate and deployed between the folded dipole radiation arms to form a bridge circuit to generate indirect coupling between the radiation arms and increase the in-band resonance points.

[0010] In some embodiments, an LC resonant circuit formed by the slot capacitor and the inductor circuit is located between each of the folded dipole radiation arms and a corresponding side surface of the balun, and is used to prevent coupling currents of other frequency bands from flowing to the balun.

[0011] In some embodiments, the anti-interference ultra-wideband radiation unit has a standing wave ratio of less than 1.5 and an isolation greater than or equal to 24.5 dB in an operating frequency band of 1.66 to 2.74 GHz.

[0012] In some embodiments, the circuits of the balun and the base are printed on a second substrate with a dielectric constant of 3.0, a loss tangent of 0.002, and a thickness of 0.762 mm.

[0013] In some embodiments, the height of the radiation unit is less than 24 mm.

[0014] In some embodiments, the balun is a coupled L-type probe-fed balun, and the balun is used to couple and feed the radiating surface to provide basic conditions for broadband impedance matching.

[0015] In some embodiments, the shape of the phase-deflecting plate includes but is not limited to a rectangle or an ellipse, and the phase-deflecting plate is fixed above the radiation surface and maintains a preset distance between the phase-deflecting plate and the radiation surface.

[0016] In a second aspect, an embodiment of the present invention provides an anti-interference ultra-wideband antenna, comprising the anti-interference ultra-wideband radiation unit described in any embodiment of the first aspect.

[0017] According to an embodiment of the present invention, an anti-interference ultra-wideband antenna is provided, which has at least the following beneficial effects: the present invention provides an anti-interference ultra-wideband radiation unit. A phase-inducing plate is located above the radiation surface and is used to expand the bandwidth; the radiation surface is composed of four folded dipole radiation arms, which are printed on a first substrate with a dielectric constant of 4.4, a loss tangent of 0.005, and a thickness of 0.762 mm, and each folded dipole radiation arm is connected to each other through a high-impedance wire; a balun includes an inductance circuit and a capacitance circuit on the front and back sides, the inductance circuit is arranged in a curved manner, and is electrically conductive through a metallized via, and the capacitance circuit is energy coupled through a gap in the thickness of the substrate to form a gap capacitance, and the balun is connected to each folded dipole radiation arm to provide broadband impedance matching; a base is connected to the balun and is used to convert the feeding type so that the coaxial cable is welded parallel to the base. Among them, the gap capacitance and the inductance circuit are used to form an LC resonant circuit, the inductance value of the LC resonant circuit is determined by the length of the inductance circuit on the front and back sides of the balun, and the capacitance value of the LC resonant circuit is determined by the size of the capacitance circuit on the front and back sides of the balun. An LC resonant circuit is formed between each folded dipole radiating arm and the corresponding side of the balun, and is used to prevent coupling currents of other frequency bands from flowing to the balun. By introducing the LC resonant circuit, the coupling currents of other frequency bands can be effectively prevented from flowing to the balun of the radiating unit, reducing inter-band interference and improving the isolation of the system, so the electromagnetic interference between different frequency bands can be effectively reduced; at the same time, it can be understood that the folded dipole radiating unit scheme in the present application has high gain characteristics and good beam convergence, which is better than the traditional half-wavelength dipole. Through the design of the above-mentioned LC resonant circuit, the problem of high input impedance of the half-wavelength folded dipole is successfully solved, ultra-wideband matching is achieved, and its operating frequency band is broadened, so the gain of the anti-interference ultra-wideband radiating unit and the anti-interference ultra-wideband antenna can be effectively improved.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of an oblique upward direction corresponding to an anti-interference ultra-wideband radiation unit provided by an embodiment of the present invention; Figure 2This is a bottom direction schematic diagram corresponding to an anti-interference ultra-wideband radiation unit provided by an embodiment of the present invention; Figure 3 is a side cross-sectional view corresponding to an anti-interference ultra-wideband radiation unit provided by an embodiment of the present invention; Figure 4 It is a top schematic diagram corresponding to an anti-interference ultra-wideband radiation unit provided by an embodiment of the present invention; Figure 5 is a schematic diagram of a balun corresponding to an anti-interference ultra-wideband radiation unit provided by an embodiment of the present invention; Figure 6 is a vertical cross-sectional view corresponding to an anti-interference ultra-wideband radiation unit provided by an embodiment of the present invention; Figure 7 It is a multi-frequency integration schematic diagram corresponding to an anti-interference ultra-wideband radiation unit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0022] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "any one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of the first and the second, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0023] It should be noted that the terms such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0024] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] With the increasing number of modern base station antennas, multi-band integrated antennas have become the mainstream trend of base station antennas today. The purpose of multi-band integrated antennas is to integrate multiple radiating units of different frequency bands into one antenna to reduce the number and volume of antennas and improve the utilization rate of sites. However, when radiating units of different operating frequencies are installed in the same antenna, due to the small spacing between them, strong coupling will occur between radiating units of different frequency bands, resulting in a serious deterioration in the isolation between systems of different frequency bands. This not only affects the performance of the antenna, but also increases the complexity and cost of the system.

[0026] In the prior art, in order to solve the above problems, the following methods are usually used: Increasing the distance between radiation units in different frequency bands: This method will lead to an increase in the overall volume of the base station antenna, increase production costs, and does not meet the requirements of modern operators for antenna miniaturization. Adding filters between different frequency bands: Although filters can improve isolation, due to the large volume of filters, the complexity of the internal structure of the antenna will increase, which is not conducive to improving production efficiency. Using half-wavelength dipoles for array formation: Although half-wavelength dipoles can achieve multi-band integration, they have disadvantages such as limited gain improvement and poor beam convergence. Although the beam convergence and gain performance of half-wavelength folded dipoles are better under the radiation boundary conditions of the same size, their input impedance is high, and it is difficult to achieve ultra-wideband matching, resulting in a narrow operating frequency band, and it is difficult to meet the requirements of modern operators. Therefore, it is necessary to design an ultra-wideband radiation unit that can reduce electromagnetic interference between different frequency bands and has high gain characteristics to overcome the above-mentioned shortcomings of the prior art.

[0027] Based on this, reference Figures 1 to 7 , Figure 1 This is a schematic diagram of an oblique upward direction corresponding to an anti-interference ultra-wideband radiation unit provided by an embodiment of the present invention; Figure 2 This is a bottom direction schematic diagram corresponding to an anti-interference ultra-wideband radiation unit provided by an embodiment of the present invention; Figure 3 is a side cross-sectional view corresponding to an anti-interference ultra-wideband radiation unit provided by an embodiment of the present invention; Figure 4It is a top schematic diagram corresponding to an anti-interference ultra-wideband radiation unit provided by an embodiment of the present invention; in the first aspect, an embodiment of the present invention provides an anti-interference ultra-wideband radiation unit 100, including: a phase-inducing plate 2, located above a radiation surface 3, for expanding bandwidth; a radiation surface 3, composed of four folded dipole radiation arms, printed on a first substrate with a dielectric constant of 4.4, a loss tangent of 0.005, and a thickness of 0.762 mm, each folded dipole radiation arm is connected to each other by a high-impedance wire; a balun 4, including an inductor circuit and a capacitor circuit on the front and back sides, the inductor circuit is bent and electrically connected through a metallized via, and the capacitor circuit is energy coupled through a gap in the thickness of the substrate to form a gap capacitor, The balun 4 is connected to each folded dipole radiating arm to provide broadband impedance matching; the base 5 is connected to the balun 4 to convert the feeding type so that the coaxial cable 1 is welded parallel to the base 5; the balun 4 is a device for converting a balanced signal into an unbalanced signal or converting an unbalanced signal into a balanced signal. In the present application, it is connected to each folded dipole radiating arm to provide broadband impedance matching to ensure the stability and efficiency of signal transmission; the inductor circuit is a circuit composed of inductor elements for storing and releasing magnetic field energy; the capacitor circuit is a circuit composed of capacitor elements for storing and releasing electric field energy; the metallized via is a metal hole in a multilayer printed circuit board (PCB) for connecting conductive paths between different layers.

[0028] Among them, the phase-inducing plate 2 is an element for adjusting the phase of electromagnetic waves, which is located above the radiation surface 3 and is used to expand the working bandwidth of the radiation unit 100 to ensure good impedance matching performance within a wide frequency band; the radiation surface 3 is the part of the antenna responsible for transmitting and receiving electromagnetic waves, and is composed of multiple radiation arms; the folded dipole radiation arm is a specially designed dipole antenna, which reduces its physical size by folding while maintaining or improving its electrical performance; the high-impedance conductor is a transmission line with a higher characteristic impedance, which is used to connect different radiation arms, can reduce the coupling between the radiation arms, and improve the overall performance of the radiation unit 100; the coaxial cable 1 is a cable for transmitting high-frequency signals, which is composed of a central conductor, an insulating layer, a shielding layer and an outer sheath. In this embodiment, the coaxial cable 1 is used to transmit signals from an external device to the radiation unit 100, and is welded through the base 5 to ensure the stability and efficiency of the signal transmission.

[0029] In some embodiments, the gap capacitor is a capacitor formed by the gap on the substrate, and the capacitance effect is achieved by using the dielectric constant of the substrate and the geometric dimensions of the gap; the base 5 is a structural component used to support and fix the radiation unit 100, and is connected to the balun 4; the LC resonant circuit is a circuit composed of an inductor (L) and a capacitor (C), which can produce a resonance effect at a specific frequency. In this embodiment, the LC resonant circuit is formed between each folded dipole radiation arm and the corresponding side of the balun 4, which is used to prevent coupling currents in other frequency bands from flowing to the balun 4, reduce inter-band interference, and improve the isolation of the system.

[0030] Among them, it can be understood that the gap capacitor and the inductor circuit are used to form an LC resonant circuit, the inductance value of the LC resonant circuit is determined by the length of the inductor circuit on the front and back of the balun 4, and the capacitance value of the LC resonant circuit is determined by the size of the capacitor circuit on the front and back of the balun 4. The LC resonant circuit is formed between each folded dipole radiating arm and the corresponding side of the balun 4, and is used to prevent the coupling current of other frequency bands from flowing to the balun 4. By introducing the LC resonant circuit, the coupling current of other frequency bands can be effectively prevented from flowing to the balun 4 of the radiation unit 100, reducing inter-band interference and improving the isolation of the system, so the electromagnetic interference between different frequency bands can be effectively reduced; at the same time, it can be understood that the folded dipole radiation unit 100 scheme in the present application has high gain characteristics and good beam convergence, which is better than the traditional half-wavelength dipole, and through the design of the above-mentioned LC resonant circuit, the problem of high input impedance of the half-wavelength folded dipole is successfully solved, ultra-wideband matching is achieved, and its working frequency band is broadened, so the gain of the anti-interference ultra-wideband radiation unit 100 and the anti-interference ultra-wideband antenna can be effectively improved.

[0031] In some embodiments, the phase-inducing plate 2 is located above the radiating surface 3 to expand the bandwidth. It can be understood that the phase-inducing plate 2 can effectively expand the working bandwidth of the radiating unit 100 through its special geometric shape and size design, ensuring good impedance matching performance in a wide bandwidth.

[0032] Specifically, the phase-inducing sheet 2 can be fixed above the radiation surface 3 by adhesive or mechanical fixing, and a certain distance is maintained between the phase-inducing sheet 2 and the radiation surface 3 to enhance the bandwidth expansion effect.

[0033] In some embodiments, the radiation surface 3 is composed of four folded dipole radiation arms, which are printed on a first substrate with a dielectric constant of 4.4, a loss tangent of 0.005, and a thickness of 0.762 mm. Each folded dipole radiation arm is connected to each other through a high-impedance wire to reduce the coupling between the radiation arms and improve the performance of the radiation unit 100. The design of the folded dipole radiation arm makes the beam convergence and gain performance better under the radiation boundary conditions of the same size, which is better than the traditional half-wavelength dipole.

[0034] In some embodiments, the balun 4 includes an inductor circuit and a capacitor circuit on the front and back sides. The inductor circuit is arranged in a curved manner and electrically connected through metallized vias. The capacitor circuit couples energy through the gap in the thickness of the substrate to form a gap capacitor. The balun 4 is connected to each folded dipole radiation arm to provide broadband impedance matching. By introducing the LC resonant circuit, the coupling current of other frequency bands can be effectively prevented from flowing to the balun 4, reducing inter-band interference and improving the isolation of the system. At the same time, the inductance value and capacitance value of the LC resonant circuit can be determined by optimizing the length of the inductor circuit and the size of the capacitor circuit to achieve optimal anti-interference and broadband matching performance.

[0035] In some embodiments, the base 5 is connected to the balun 4 for switching the feed type. The design of the base 5 allows the coaxial cable 1 to be welded parallel to the base 5, improving welding quality and reliability and ensuring the switching of the feed type. Specifically, the base 5 is connected to the balun 4 through a metallized via to ensure electrical conduction.

[0036] In some embodiments, each pair of folded dipole radiation arms are connected together through a high impedance wire, and the shape of the high impedance wire may be spiral, straight or serpentine to minimize coupling between the radiation arms.

[0037] In some embodiments, the inductor circuit on the balun 4 is arranged in a curved manner and electrically connected through a metallized via, with an inductance value ranging from 10nH to 100nH, and the capacitor circuit couples energy through a gap in the thickness of the substrate to form a gap capacitor with a capacitance value ranging from 0.5pF to 5pF, and the balun 4 is connected to each folded dipole radiation arm to provide broadband impedance matching. It can be understood that the inductor circuits on the front and back of the balun 4 can reduce space occupancy by bending.

[0038] In some embodiments, the design of the base 5 includes a flat type, a groove type or a protrusion type, so that the welding surface of the coaxial cable 1 becomes larger, and the welding quality and reliability are improved. The base 5 is connected to the balun 4 through a metallized via to ensure electrical conductivity.

[0039] refer to Figure 5 and Figure 6 , Figure 5 It is a schematic diagram of a balun 4 corresponding to an anti-interference ultra-wideband radiation unit 100 provided in an embodiment of the present invention; Figure 6 is a vertical cross-sectional view corresponding to an anti-interference ultra-wideband radiation unit 100 provided in an embodiment of the present invention; in some embodiments, the balun 4 is composed of two second substrates intersecting each other, such as Figure 5 (a) and (b) represent the front and back sides of the second substrate A, respectively, and Figure 5(c) and (d) represent the front and back sides of the second substrate B respectively, corresponding to the four folded dipole radiation arms in the present application. The gap capacitor and the inductance circuit 42 on the second substrate are used to form an LC resonant circuit. The inductance value of the LC resonant circuit is determined by the length of the inductance circuit 42 located on the front and back sides of the second substrate in the balun 4. The capacitance value of the LC resonant circuit is determined by the size of the capacitance circuit 41 located on the front and back sides of the second substrate in the balun 4. A total of four LC resonant circuits are formed between the four folded dipole radiation arms and the side faces of the second substrate corresponding to the balun 4, which are used to prevent coupling currents in other frequency bands from flowing to the balun 4.

[0040] In some embodiments, the parasitic sheet 31 is printed on the lower layer of the first substrate and deployed between the folded dipole radiation arms. The parasitic sheet 31 becomes a bridge circuit, which causes indirect coupling between the radiation arms, increases the in-band resonance points, and thus improves the performance of the radiation unit 100. Specifically, the shape of the parasitic sheet 31 can be rectangular, circular, or other geometric shapes, and the specific size is optimized according to actual needs. For example, the area ranges from 5mm² to 10mm², and the thickness is 0.1mm to 0.5mm. The parasitic sheet 31 is deployed between the folded dipole radiation arms to form a bridge circuit, which causes indirect coupling between the radiation arms, increases the in-band resonance points, and thus improves the frequency response and bandwidth performance of the radiation unit 100.

[0041] In some embodiments, an LC resonant circuit is formed between each folded dipole radiating arm and the corresponding side of the balun 4. The LC resonant circuit is used to prevent coupling currents of other frequency bands from flowing to the balun 4, reduce inter-band interference, and improve the isolation of the system. The LC resonant circuit is formed between each folded dipole radiating arm and the corresponding side of the balun 4 to ensure good impedance matching performance within a wide bandwidth.

[0042] In some embodiments, the anti-interference ultra-wideband radiation unit 100 further includes four parasitic plates 31, which are printed on the lower layer of the first substrate and deployed between the folded dipole radiation arms to form a bridge circuit to generate indirect coupling between the radiation arms and increase the in-band resonance points.

[0043] It can be understood that increasing the in-band resonance point refers to introducing multiple resonance frequency points within the operating frequency band of the antenna or radiation unit 100 to improve its frequency response and bandwidth performance. In the antenna or radiation unit 100, the resonance point refers to the frequency point at which the antenna exhibits maximum radiation efficiency and minimum reflection loss at a specific frequency. At these frequency points, the input impedance of the antenna is well matched with the characteristic impedance of the transmission line, and the signal transmission efficiency is the highest. The present application can form multiple resonance frequency points within a wide frequency band by generating indirect coupling between the radiation arms, so that the antenna has a flatter frequency response curve within the entire operating frequency band, thereby achieving bandwidth expansion and impedance matching.

[0044] In some embodiments, an LC resonant circuit is formed between each folded dipole radiating arm and the corresponding side of the balun 4 to prevent coupling currents from other frequency bands from flowing to the balun 4, thereby ensuring good impedance matching performance within a wide bandwidth, reducing inter-band interference, and improving system isolation.

[0045] In some embodiments, the anti-interference ultra-wideband radiation unit 100 has a standing wave ratio of less than 1.5 and an isolation greater than or equal to 24.5 dB in the working frequency band of 1.66 to 2.74 GHz. It can be understood that a standing wave ratio of less than 1.5 means that the radiation unit 100 has good impedance matching performance in the entire working frequency band, reduces reflection loss, and improves signal transmission efficiency. An isolation greater than or equal to 24.5 dB means that the interference between different frequency bands of the radiation unit 100 is very small, which improves the anti-interference ability of the system.

[0046] In some embodiments, the circuits of the balun 4 and the base 5 are printed on a second substrate with a dielectric constant of 3.0, a loss tangent of 0.002, and a thickness of 0.762 mm. It can be understood that the use of low-loss substrate materials can further reduce the loss during signal transmission and improve the overall performance.

[0047] In some embodiments, the height of the radiation unit 100 is less than 24 mm. It can be understood that the low-profile design makes the radiation unit 100 suitable for various space-constrained application scenarios, such as mobile communication devices, portable devices, etc.

[0048] In some embodiments, the balun 4 is a coupled L-type probe-feed balun, that is, the balun 4 is provided with Figure 5 The L-shaped probe 43 and balun 4 shown are used to couple and feed the radiating surface 3 to provide the basic conditions for broadband impedance matching. It can be understood that the balun 4 is a coupled L-type probe feeding balun, which is used to couple and feed the radiating surface 3. The L-type probe feeding balun 4 is simple in design and low in cost, and can provide good broadband impedance matching performance to ensure the stability and efficiency of signal transmission.

[0049] In some embodiments, the shape of the deflector sheet 2 includes but is not limited to a rectangle or an ellipse, and the deflector sheet 2 is fixed above the radiation surface 3, and a preset distance is maintained between the deflector sheet 2 and the radiation surface 3. It is understandable that the shape of the deflector sheet 2 can be a rectangle or an ellipse, and the specific size is optimized according to actual needs. The deflector sheet 2 is fixed above the radiation surface 3 through a plastic part, and a distance of about 6 mm is maintained between the deflector sheet 2 and the radiation surface 3. It is understandable that the deflector sheet 2 can effectively expand the working bandwidth of the radiation unit 100 through the above-mentioned geometric shape and size design, and ensure good impedance matching performance in a wide frequency band.

[0050] refer to Figure 7 , Figure 7 is a schematic diagram of multi-frequency integration corresponding to an anti-interference ultra-wideband radiation unit 100 provided in an embodiment of the present invention; in some embodiments, such as Figure 7 It can be understood that the directions of the x-band working current a1 and the x-band coupling current a2 are marked in the figure, which shows that the unit of the present application can effectively transfer and isolate energy between different frequency bands. By introducing an LC resonant circuit 40 between each folded dipole radiation arm 50 and the balun 4, the coupling current of other frequency bands can be effectively prevented from flowing to the balun 4, reducing inter-band interference and improving the isolation of the system. At the same time, through the optimized impedance matching design, good impedance matching performance is ensured in a wide frequency band, thereby achieving ultra-wideband characteristics.

[0051] In a second aspect, an embodiment of the present invention provides an anti-interference ultra-wideband antenna, comprising the anti-interference ultra-wideband radiation unit of any embodiment of the first aspect.

[0052] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An anti-interference ultra-wideband radiation unit, characterized in that: include: The induction photo is located above the radiating surface and is used to expand the bandwidth; The radiation surface is composed of four folded dipole radiation arms, printed on a first substrate with a dielectric constant of 4.4, a loss tangent of 0.005, and a thickness of 0.762 mm, and each folded dipole radiation arm is connected together by a high-impedance wire; A balun, comprising an inductor circuit and a capacitor circuit on the front and back sides, wherein the inductor circuit is arranged in a bent manner and electrically connected through a metallized via, and the capacitor circuit performs energy coupling through a gap in the thickness of the substrate to form a gap capacitor, and the balun is connected to each of the folded dipole radiation arms to provide broadband impedance matching; The base, connected to the balun, is used to convert the feed type so that the coaxial cable is soldered parallel to the base.

2. The anti-interference ultra-wideband radiation unit according to claim 1, characterized in that: The anti-interference ultra-wideband radiation unit also includes four parasitic sheets, which are printed on the lower layer of the first substrate and deployed between the folded dipole radiation arms to form a bridge circuit to generate indirect coupling between the radiation arms and increase the in-band resonance points.

3. The anti-interference ultra-wideband radiation unit according to claim 1, characterized in that: An LC resonant circuit formed by the slot capacitor and the inductor circuit is located between each of the folded dipole radiation arms and a corresponding side surface of the balun.

4. The anti-interference ultra-wideband radiation unit according to claim 1, characterized in that: The anti-interference ultra-wideband radiation unit has a standing wave ratio of less than 1.5 and an isolation greater than or equal to 24.5 dB in an operating frequency band of 1.66 to 2.74 GHz.

5. The anti-interference ultra-wideband radiation unit according to claim 1, characterized in that: The circuits of the balun and the base are both printed on a second substrate with a dielectric constant of 3.0, a loss tangent of 0.002, and a thickness of 0.762 mm.

6. The anti-interference ultra-wideband radiation unit according to claim 1, characterized in that: The height of the radiation unit is less than 24 mm.

7. The anti-interference ultra-wideband radiation unit according to claim 1, characterized in that: The balun is a coupled L-shaped probe-type feeding balun, and the balun is used to couple and feed the radiating surface.

8. The anti-interference ultra-wideband radiation unit according to claim 1, characterized in that: The shape of the phase-inducing sheet includes a rectangle or an ellipse. The phase-inducing sheet is fixed above the radiation surface and maintains a preset distance between the phase-inducing sheet and the radiation surface.

9. An anti-interference ultra-wideband antenna, characterized in that: The method comprises a plurality of anti-interference ultra-wideband radiation units according to any one of claims 1 to 8.

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