Double-layer multiband four-arm helical antenna

Abstract

The invention relates to the technical field of circularly polarized antennas, in particular to a double-layer multiband four-arm spiral antenna which comprises an outer dielectric layer, an outer radiation assembly, an inner dielectric layer, an inner radiation assembly, a floor, a dielectric substrate and a feed network. The inner-layer radiation assembly can be connected with a feed network through a feed probe, the inner-layer radiation assembly with direct feed feeds excitation signals into the outer-layer radiation assembly with non-direct feed through electromagnetic coupling, the signal amplitudes passing through four feed points are equal, the phases are sequentially lagged by 90 degrees, and circularly polarized waves are radiated. Compared with the prior art, the multi-band four-arm helical antenna has the working frequency capable of being adjusted independently, the beam width of the antenna can be adjusted independently, and the antenna is simple in structure and easy to machine, can meet the requirement that two sets of receiving and transmitting systems with different frequencies work at the same time, and conforms to the development trend of integration and miniaturization of a current communication system.

Description

Technical Field

[0001] The invention relates to the technical field of circular polarization antennas, and in particular to a double-layer multi-band four-arm helical antenna. Background Art

[0002] In recent years, low-Earth orbit communication satellites have attracted much attention due to their lower transmission delay and higher data transmission rate, and have made rapid technological progress. However, the relative position between the communication satellite and the ground user changes rapidly, especially when the satellite is at a low elevation angle. Compared with when the satellite is directly above the ground equipment, the distance to the user is significantly increased, resulting in a significant increase in signal propagation path loss, which increases the difficulty of designing the communication system. Therefore, these antennas with greater gain in the low elevation angle direction are a feasible solution, among which ultra-wide beam antennas with a cardioid radiation pattern are considered to be particularly suitable for such application scenarios.

[0003] At present, the research on multi-band QHA is mainly focused on the design of dual-band or tri-band antennas, and there is no quadrifilar helical antenna with more than three frequency bands. Each set of satellite communication frequencies is an uplink frequency plus a downlink frequency. If a system uses two different sets of frequencies at the same time, the current quadrifilar helical antennas with three or less communication frequencies cannot meet the requirements, and there is no broadband quadrifilar helical antenna that can meet the requirements of two sets of frequencies at the same time. Therefore, it is necessary to design an antenna that can cover two sets of four satellite communication frequencies at the same time and has good beam width, etc. Summary of the invention

[0004] The purpose of the present invention is to provide a double-layer multi-band four-arm helical antenna, which can meet all the requirements of the satellite communication system for the bandwidth, beam width and low elevation gain of the antenna in two groups of four frequency bands, and these four frequency bands are independently adjustable.

[0005] To achieve the above object, the present invention provides a double-layer multi-band four-arm helical antenna, comprising an outer dielectric layer, an outer radiating component, an inner dielectric layer, an inner radiating component, a dielectric substrate and a feeding network;

[0006] The outer dielectric layer is sleeved outside the inner dielectric layer, the outer radiation component is attached to the outer surface of the outer dielectric layer, the inner radiation component is attached to the outer surface of the inner dielectric layer, the lower ends of the outer radiation component and the inner radiation component are aligned and placed on the dielectric substrate, the feeding network can be attached to both sides of the dielectric substrate, if the feeding network is attached to the lower layer of the dielectric substrate, the upper layer of the dielectric substrate is also provided with a floor, the feeding network is connected to the inner radiation component through a feeding probe penetrating the floor and the dielectric substrate; if the feeding network is attached to the upper layer of the dielectric substrate, the output port of the feeding network is directly connected to the inner radiation component.

[0007] Wherein, the outer dielectric layer is a dielectric cylinder with a wall thickness of 0.3-3 mm, and the inner dielectric layer is a dielectric cylinder with a wall thickness of 0.3-5 mm.

[0008] Among them, the outer radiation component is aligned with the lower end of the outer dielectric layer; the inner radiation component is aligned with the lower end of the inner dielectric layer; the heights of the outer radiation component and the inner radiation component are set as needed.

[0009] The outer radiation component is composed of four groups of metal radiation arms attached to the outer dielectric layer and arranged at equal distances, and each group of radiation arms includes two separate radiation arms; the inner radiation component is also composed of four groups of metal radiation arms attached to the outer dielectric layer and arranged at equal distances, and each group of radiation arms of the inner radiation component includes a feeding point and two separate radiation arms;

[0010] The radiation arm groups of the outer radiation component and the inner radiation component are respectively arranged in a rotation manner at a certain angle to the plane where the feeding network is located.

[0011] The radiation arm can be printed on the flexible medium and then bonded to the surface of the supporting outer / inner dielectric layer, or can be directly printed on the surface of the dielectric layer, or can be formed by a self-supporting metal strip.

[0012] The floor is a thin metal layer with four through holes, the dielectric substrate is a dielectric layer with a thickness of 0.3-3 mm, and when the feed network is attached to the lower layer of the dielectric substrate, the dielectric substrate also has four through holes at the opening positions corresponding to the floor.

[0013] Wherein, the feeding network includes a signal input port and four signal output ports, each signal output port coincides with the center point of the through hole on the floor and the dielectric substrate in the vertical direction, and when the feeding network is attached to the lower layer of the dielectric substrate, the feeding probe includes four conductive metal columns with a diameter of 0.3-2mm, the upper end of the feeding probe is connected to the feeding point of the corresponding radiating arm on the inner layer radiating component, and the lower end is connected to a signal output port of the corresponding feeding network.

[0014] The through hole openings of the dielectric substrate and the output port openings of the feeding network are consistent with the size of the feeding probe, and the four through hole openings of the floor are 1-2 mm larger than the size of the feeding probe.

[0015] The feeding network may be composed of a printed circuit, or may be composed of a printed circuit and a chip.

[0016] The present invention provides a double-layer multi-band four-arm helical antenna, comprising an outer dielectric layer, an outer radiating component, an inner dielectric layer, an inner radiating component, a floor, a dielectric substrate, a feeding probe and a feeding network, wherein the outer radiating component and the inner radiating component are respectively provided with correspondingly arranged radiating arms of different lengths, the inner radiating component is connected to the feeding network through the feeding probe, and the directly fed inner radiating component feeds an excitation signal to the indirect fed outer radiating component through electromagnetic coupling, and the signal amplitudes through the four feeding points are equal and the phases lag by 90° successively, radiating circularly polarized waves. Compared with the prior art, the multi-band four-arm helical antenna of the present invention has an independently adjustable operating frequency, and its beam width can also be independently adjusted, and has a simple structure and is easy to process, and can meet the simultaneous operation of two groups of transceiver systems with different frequencies, which is in line with the current development trend of integration and miniaturization of communication systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the structural decomposition of a double-layer, quad-band, quadrifilar helical antenna according to a specific embodiment of the present invention.

[0019] Figure 2 is an expanded view of an outer radiation component of a specific embodiment of the present invention;

[0020] Figure 3 is an expanded view of an inner radiation component of a specific embodiment of the present invention;

[0021] Figure 4 It is a schematic plan view of a floor 5 according to a specific embodiment of the present invention.

[0022] Figure 5 Schematic diagram of a dielectric substrate 6 according to a specific embodiment of the present invention.

[0023] Figure 6 FIG. 8 is a schematic plan view of a feeding network 8 according to a specific embodiment of the present invention.

[0024] Figure 7 It is a reflection coefficient curve of the signal input port 85 tested by a vector network analyzer in a specific embodiment of the present invention.

[0025] Figure 8 It is a reflection coefficient curve of the radiating arm feeding point 413 / 423 / 433 / 443 tested by a vector network analyzer in a specific embodiment of the present invention.

[0026] Fig. 9 It is a curve showing the variation of the half-power beam width in the elevation plane (phi=0° and phi=90°) with the frequency in a specific embodiment of the present invention.

[0027] Fig.10 It is a curve showing the variation of the 3dB axial ratio beamwidth in the elevation plane (phi=0° and phi=90°) with the frequency in a specific embodiment of the present invention.

[0028] Fig.11 It is the radiation pattern of the horizontal plane (theta=90°) and two mutually orthogonal elevation planes (phi=0° and phi=90°) at 1.995 GHz in a specific embodiment of the present invention.

[0029] Fig.12 It is the radiation pattern of the horizontal plane (theta=90°) and two mutually orthogonal elevation planes (phi=0° and phi=90°) at 2.185 GHz in a specific embodiment of the present invention.

[0030] Fig.13 It is the radiation pattern of the horizontal plane (theta=90°) and two mutually orthogonal elevation planes (phi=0° and phi=90°) at 2.51 GHz in a specific embodiment of the present invention.

[0031] Fig.14 It is the radiation pattern of the horizontal plane (theta=90°) and two mutually orthogonal elevation planes (phi=0° and phi=90°) at 2.68 GHz in a specific embodiment of the present invention.

[0032] Fig.15 It is an axial ratio characteristic curve of two mutually orthogonal pitch planes (phi=0° and phi=90°) at 1.995 GHz in a specific embodiment of the present invention.

[0033] Fig.16 It is an axial ratio characteristic curve of two mutually orthogonal pitch planes (phi=0° and phi=90°) at 2.185 GHz in a specific embodiment of the present invention.

[0034] Fig.17 It is an axial ratio characteristic curve of two mutually orthogonal pitch planes (phi=0° and phi=90°) at 2.51 GHz in a specific embodiment of the present invention.

[0035] Fig.18 It is an axial ratio characteristic curve of two mutually orthogonal pitch planes (phi=0° and phi=90°) at 2.68 GHz in a specific embodiment of the present invention.

[0036] 1-outer dielectric layer, 2-outer radiation component, 21-radiation arm group, 211-radiation arm, 212-radiation arm, 22-radiation arm group, 23-radiation arm group, 24-radiation arm group, 25-flexible dielectric, 3-inner dielectric layer, 4-inner radiation component, 41-radiation arm group, 411-radiation arm, 412-radiation arm, 413-feeding point, 42-radiation arm group, 43-radiation arm group, 44-radiation arm group, 45-flexible dielectric, 5-floor, 51-open Hole, 52-opening, 53-opening, 54-opening, 55-metal layer, 6-dielectric substrate, 61-opening, 62-opening, 63-opening, 64-opening, 65-dielectric layer, 7-feeding probe, 71-conductive metal column, 72-conductive metal column, 73-conductive metal column, 74-conductive metal column, 8-feeding network, 81-signal output port, 81-signal output port, 81-signal output port, 85-signal input port. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] The present invention provides a double-layer multi-band four-arm helical antenna, comprising an outer dielectric layer, an outer radiation component, an inner dielectric layer, an inner radiation component, a dielectric substrate and a feeding network;

[0039] The outer dielectric layer is sleeved outside the inner dielectric layer, the outer radiation component is attached to the outer surface of the outer dielectric layer, the inner radiation component is attached to the outer surface of the inner dielectric layer, the lower ends of the outer radiation component and the inner radiation component are aligned and placed on the dielectric substrate, the feeding network can be attached to both sides of the dielectric substrate, if the feeding network is attached to the lower layer of the dielectric substrate, the upper layer of the dielectric substrate is also provided with a floor, the feeding network is connected to the inner radiation component through a feeding probe penetrating the floor and the dielectric substrate; if the feeding network is attached to the upper layer of the dielectric substrate, the output port of the feeding network is directly connected to the inner radiation component.

[0040] The outer radiation component includes four groups of radiation arm groups, each group of radiation arm groups includes 1-2 radiation arms of different lengths, and each of the four groups of radiation arm groups is arranged at an angle of 90° and rotated to form a certain angle with the horizontal plane (the plane where the feed network is located is the horizontal plane);

[0041] The inner radiation component comprises four groups of radiation arm groups, each group of radiation arm groups comprises 1-2 radiation arms of different lengths, and each of the four groups of radiation arm groups is arranged in a rotation manner at an angle of 90° to the horizontal plane (the plane where the feed network is located is the horizontal plane) at a certain angle;

[0042] The two radiating arms of the radiating arm group may be independent (separated and not connected) or connected together through the bottom.

[0043] The feeding network is placed horizontally, and the outer radiation component and the inner radiation component are placed coaxially on the feeding network.

[0044] The inner radiating component and one of the outer radiating components are directly fed with excitation signals with equal amplitudes and phases delayed by 90° to four groups of radiating arms by a feeding network, and the directly fed radiating component feeds the excitation signal to the indirect fed radiating component through electromagnetic coupling.

[0045] Furthermore, the radiating arm can be printed on a flexible medium and then bonded to the surface of a supporting dielectric column, or it can be directly printed on the surface of the dielectric column, or it can be formed by a self-supporting metal strip (that is, the radiating arm can be composed of a separate metal strip, or it can be directly printed on the surface of a supporting dielectric column, or it can be printed on a flexible circuit and then bonded to the surface of the dielectric column).

[0046] The feeding network may be composed of a printed circuit, or may be composed of a printed circuit and a chip (ie, the feeding network may be a simple printed circuit, or may be composed of 1-3 feeding chips and a printed circuit).

[0047] See also Figures 1 to 6 The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0048] This example is a double-layer four-arm helical antenna with four operating frequency bands. The parameters are as follows:

[0049] The center frequencies of the four operating frequencies are f1=1.995GHZ, f2=2.185GHz, f3=2.51GHz, and f4=2.68GHz, and the corresponding four operating bandwidths are B1=B2=30MHz, B3=B4=20MHz; the polarization mode is left-hand circular polarization.

[0050] Specific structure such as Figure 1As shown, it includes an outer dielectric layer 1, an outer radiation component 2, an inner dielectric layer 3, an inner radiation component 4, a floor 5, a dielectric substrate 6, a feeding probe 7, and a feeding network 8; the outer dielectric layer 1 is a low-loss dielectric cylinder with a wall thickness of 1 mm; the outer radiation component 2 includes a flexible low-loss dielectric 25 and four groups of metal radiation arm groups 21 / 22 / 23 / 24 equidistantly arranged on the flexible dielectric, each radiation arm group includes two separate radiation arms (such as the radiation arm group 21 includes the radiation arm 211 / 212); the inner dielectric layer 3 is a low-loss dielectric cylinder with a wall thickness of 3 mm; the inner radiation component 4 includes a flexible low-loss dielectric 45 and four groups of metal radiation arm groups 21 / 22 / 23 / 24 equidistantly arranged on the flexible dielectric Four groups of metal radiation arm groups 41 / 42 / 43 / 44 are set, each group of radiation arm groups includes a feeding point and two separate radiation arms (such as the radiation arm group 41 includes a feeding point 413 and radiation arms 411 / 412); the floor 5 includes a thin metal layer 55 and four openings 51 / 52 / 53 / 54; the dielectric substrate 6 includes a low-loss dielectric layer 65 with a thickness of 1 mm and four openings 61 / 62 / 63 / 64; the feeding probe 7 includes four conductive metal columns 71 / 71 / 73 / 74 with a diameter of 1 mm; the floor 5 and the dielectric substrate 6; the feeding network 8 includes a signal input port 85 and four signal output ports 81 / 82 / 83 / 84.

[0051] The outer radiation component 2 has the same height as the outer dielectric layer 1 , and the outer radiation component 2 is aligned with the lower end of the outer dielectric layer 1 , and is bonded to the outer surface of the outer dielectric layer 1 by adhesive.

[0052] The inner radiation component 4 has the same height as the inner dielectric layer 3 , and the inner radiation component 4 is aligned with the lower end of the inner dielectric layer 3 , and is bonded to the outer surface of the inner dielectric layer 3 by adhesive.

[0053] The outer radiation component 2 is aligned with the lower end of the inner radiation component 4 and placed on the floor 5 , and the radiation arms of the outer radiation component 2 and the inner radiation component 4 are aligned (such as the radiation arm 21 is aligned with the radiation arm 41 ).

[0054] The floor 5 and the feeding network 8 are respectively attached to the upper and lower sides of the dielectric substrate 6, and each signal output port of the feeding network 8 coincides with the center point of the opening of the metal plate 5 and the dielectric substrate 6 in the vertical direction (for example, the signal output port 81 is directly below the opening 61, and the opening 61 is directly below the opening 51).

[0055] Each metal column of the feeding probe 7 passes through the corresponding openings of the floor 5 and the dielectric plate 6, the upper end is connected to the corresponding metal radiation arm on the inner metal component 4, and the lower end is connected to a signal output port of the corresponding feeding network 8 (for example, the metal column 71 passes through the opening 51 and the opening 61, the upper end is connected to the feeding point 413, and the lower end is connected to the signal output port 81).

[0056] The openings of the dielectric substrate 6 are consistent with the openings of the output port of the feeding network and the feeding probe 7 in size, and the four openings of the floor 5 are 1-2 mm larger than the size of the feeding probe 7 to avoid short circuit between the feeding probe 7 and the floor.

[0057] The outer radiation component 2 has the same height as the outer dielectric layer 1 , and the outer radiation component 2 is aligned with the lower end of the outer dielectric layer 1 , and is bonded to the outer surface of the outer dielectric layer 1 by adhesive.

[0058] The inner radiation component 4 has the same height as the inner dielectric layer 3 , and the inner radiation component 4 is aligned with the lower end of the inner dielectric layer 3 , and is bonded to the outer surface of the inner dielectric layer 3 by adhesive.

[0059] The outer radiation component 2 is aligned with the lower end of the inner radiation component 4 and placed on the floor 5 , and the radiation arms of the outer radiation component 2 and the inner radiation component 4 are aligned (such as the radiation arm 21 is aligned with the radiation arm 41 ).

[0060] The floor 5 and the feeding network 8 are respectively attached to the upper and lower sides of the dielectric substrate 6, and each signal output port of the feeding network 8 coincides with the center point of the opening of the metal plate 5 and the dielectric substrate 6 in the vertical direction (for example, the signal output port 81 is directly below the opening 61, and the opening 61 is directly below the opening 51).

[0061] Each metal column of the feeding probe 7 passes through the corresponding openings of the floor 5 and the dielectric plate 6, the upper end is connected to the corresponding metal radiation arm on the inner metal component 4, and the lower end is connected to a signal output port of the corresponding feeding network 8 (for example, the metal column 71 passes through the opening 51 and the opening 61, the upper end is connected to the feeding point 413, and the lower end is connected to the signal output port 81).

[0062] The openings of the dielectric substrate 6 are consistent with the openings of the output port of the feeding network and the feeding probe 7 in size, and the four openings of the floor 5 are 1-2 mm larger than the size of the feeding probe 7 to avoid short circuit between the feeding probe 7 and the floor.

[0063] Furthermore, in this embodiment, a vector network analyzer is used in a microwave darkroom to record and compare. For details, please refer to Figures 7 to 18 .

[0064] Figure 7This is the reflection coefficient curve of the signal input port 85 tested by a vector network analyzer.

[0065] Figure 8 The reflection coefficient curve of the radiating arm feeding point 413 / 423 / 433 / 443 is tested by a vector network analyzer.

[0066] Fig. 9 It is a curve showing the variation of half-power beamwidth with frequency in two mutually orthogonal elevation planes (phi=0° and phi=90°) obtained by testing the example in a microwave darkroom.

[0067] Fig.10 It is a curve showing the variation of the 3dB axial ratio beamwidth with frequency in two mutually orthogonal elevation planes (phi=0° and phi=90°) obtained by testing the example in a microwave darkroom.

[0068] Fig.11 The radiation patterns of the example in the horizontal plane (theta=90°) and two mutually orthogonal elevation planes (phi=0° and phi=90°) at a frequency of 1.995 GHz are obtained by testing in a microwave darkroom.

[0069] Fig.12 The radiation patterns of the example in the horizontal plane (theta=90°) and two mutually orthogonal elevation planes (phi=0° and phi=90°) at a frequency of 2.185 GHz are obtained by testing in a microwave darkroom.

[0070] Fig.13 The radiation patterns of the example in the horizontal plane (theta=90°) and two mutually orthogonal elevation planes (phi=0° and phi=90°) at a frequency of 2.51 GHz are obtained by testing in a microwave darkroom.

[0071] Fig.14 The radiation patterns of the example in the horizontal plane (theta=90°) and two mutually orthogonal elevation planes (phi=0° and phi=90°) at a frequency of 2.68 GHz are obtained by testing in a microwave darkroom.

[0072] Fig.15 It is the axial ratio characteristic curve of two mutually orthogonal pitch planes (phi=0° and phi=90°) at a frequency of 1.995 GHz obtained by testing the example in a microwave darkroom.

[0073] Fig.16 It is the axial ratio characteristic curve of two mutually orthogonal pitch planes (phi=0° and phi=90°) at a frequency of 2.185 GHz obtained by testing the example in a microwave darkroom.

[0074] Fig.17 It is the axial ratio characteristic curve of two mutually orthogonal pitch planes (phi=0° and phi=90°) at a frequency of 2.51 GHz obtained by testing the example in a microwave darkroom.

[0075] Fig.18 It is the axial ratio characteristic curve of two mutually orthogonal pitch planes (phi=0° and phi=90°) at a frequency of 2.68 GHz obtained by testing the example in a microwave darkroom.

[0076] What is disclosed above is only one or more preferred embodiments of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and making equivalent changes according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A double-layer multi-band quadrifilar helical antenna, characterized in that: It includes an outer dielectric layer, an outer radiation component, an inner dielectric layer, an inner radiation component, a dielectric substrate and a feed network; The outer dielectric layer is sleeved outside the inner dielectric layer, the outer radiation component is attached to the outer surface of the outer dielectric layer, the inner radiation component is attached to the outer surface of the inner dielectric layer, the lower ends of the outer radiation component and the inner radiation component are aligned and placed on the dielectric substrate, the feeding network can be attached to both sides of the dielectric substrate, if the feeding network is attached to the lower layer of the dielectric substrate, the upper layer of the dielectric substrate is also provided with a floor, the feeding network is connected to the inner radiation component through a feeding probe penetrating the floor and the dielectric substrate; if the feeding network is attached to the upper layer of the dielectric substrate, the output port of the feeding network is directly connected to the inner radiation component.

2. The double-layer multi-band quadrifilar helical antenna according to claim 1, characterized in that: The outer dielectric layer is a dielectric cylinder with a wall thickness of 0.3-3 mm, and the inner dielectric layer is a dielectric cylinder with a wall thickness of 0.3-5 mm.

3. The double-layer multi-band quadrifilar helical antenna according to claim 2, characterized in that: The outer radiation component is aligned with the lower end of the outer dielectric layer; the inner radiation component is aligned with the lower end of the inner dielectric layer; the heights of the outer radiation component and the inner radiation component are set as required.

4. The double-layer multi-band quadrifilar helical antenna according to claim 3, characterized in that: The outer radiation component is composed of four groups of metal radiation arms attached to the outer dielectric layer and arranged at equal distances, and each group of radiation arms includes two separate radiation arms; the inner radiation component is also composed of four groups of metal radiation arms attached to the outer dielectric layer and arranged at equal distances, and each group of radiation arms of the inner radiation component includes a feeding point and two separate radiation arms; The radiation arm groups of the outer radiation component and the inner radiation component are respectively arranged in a rotation manner at a certain angle to the plane where the feeding network is located.

5. The double-layer multi-band quadrifilar helical antenna according to claim 4, characterized in that: The radiating arm can be printed on the flexible medium and then bonded to the surface of the supporting outer / inner dielectric layer, or can be directly printed on the surface of the dielectric layer, or can be formed by a self-supporting metal strip.

6. The double-layer multi-band quadrifilar helical antenna according to claim 5, characterized in that: The floor is a thin metal layer with four through holes, the dielectric substrate is a dielectric layer with a thickness of 0.3-3 mm, and when the feed network is attached to the lower layer of the dielectric substrate, the dielectric substrate also has four through holes at the opening positions corresponding to the floor.

7. The double-layer multi-band quadrifilar helical antenna according to claim 6, characterized in that: The feeding network includes a signal input port and four signal output ports, each signal output port coincides with the center point of the through hole on the floor and the dielectric substrate in the vertical direction, when the feeding network is attached to the lower layer of the dielectric substrate, the feeding probe includes four conductive metal columns with a diameter of 0.3-2mm, the upper end of the feeding probe is connected to the feeding point of the corresponding radiating arm on the inner layer radiating component, and the lower end is connected to a signal output port of the corresponding feeding network.

8. The double-layer multi-band quadrifilar helical antenna according to claim 7, characterized in that: The through hole openings of the dielectric substrate and the output port openings of the feeding network are consistent with the size of the feeding probe, and the four through hole openings of the floor are 0.5-2 mm larger than the size of the feeding probe.

9. The double-layer multi-band quadrifilar helical antenna according to claim 8, characterized in that: The feeding network may be composed of a printed circuit, or may be composed of a printed circuit and a chip.

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