Ku-band high-field-strength electric field sensitivity test system, design method and device

Abstract

The present invention discloses a Ku-band high-field-strength electric field sensitivity test system, design method and device, the system comprising: a transmitter generating an excitation signal, a Ku-band high-field-strength electric field sensitivity test antenna and a field strength probe receiving a quasi-plane wave; in the antenna structure, the horn comprises four sides; the reflective surface is obtained by rotating the curve and supported by the horn, and a radiation aperture is formed between the side of the horn and the reflective surface; the first rectangular waveguide converts the excitation signal into an electromagnetic wave; the moment-moment waveguide converter transmits the electromagnetic wave to the second rectangular waveguide; the second rectangular waveguide transmits the electromagnetic wave to the horn; the horn radiates the electromagnetic wave onto the reflective surface in a directional radiation manner; the reflective surface reflects the electromagnetic wave into a quasi-plane wave, and radiates it into free space directly in front of the radiation aperture. The present invention can perform an electric field radiation sensitivity test in a generated high-field-strength external radio frequency electromagnetic environment.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic environment effects, and in particular to a Ku-band high-field-strength electric field sensitivity testing system, a design method and a device. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the invention recited in the claims. No admission is made that the description herein is prior art by inclusion in this section.

[0003] At present, the electric field strength required for the sensitivity assessment in GJB151B can only achieve 200 v / m, and it is impossible to generate a situation above 200 v / m, which makes the radiation sensitivity test assessment unable to fully reflect the actual field strength situation, resulting in the inability to fully test indicators such as the sensitivity of the equipment to the high-field-strength external electromagnetic environment, which directly affects the finalization assessment of the equipment. In addition, in addition to the electric field strength of more than 200 v / m for the sensitivity assessment of equipment and subsystems, it is also necessary to generate a required field strength value higher than 200 v / m for the system-level sensitivity assessment. According to the requirements for the sensitivity assessment of surface ship platforms in GJB1389B-2022, an electric field strength of 744 v / m is required in the Ku band. When conducting an electric field sensitivity test, it is necessary to be able to generate a field strength environment of at least 744 V / m to achieve the assessment of the electric field sensitivity of equipment and subsystems.

[0004] For this situation, there are currently two main implementation methods: one is to directly use a phased array radar system for illumination to form the required field strength requirements, but this implementation method has high site requirements, is costly and very cumbersome. The more important problem is that the bandwidth of the phased array radar is narrow, so it is currently very difficult to achieve the required high field strength environment in the entire frequency band; the other is to achieve the high field strength requirement by increasing the power source transmission power, but the high-power source system mainly uses active devices such as magnetrons or gyrotrons, and uses multiple power dividers, synthesizers and power amplifier modules to achieve high-power output in a multi-stage synthesis manner, which requires a complex cooling and control system. At the same time, the entire high-power source system is bulky, complex in design, expensive, inconvenient to move, and has low flexibility.

[0005] However, through the analysis, calculation and research of the field strength generation RF link required for the electric field sensitivity test, it can be found that the generation of high field strength is mainly determined by the transmitter and antenna gain. Therefore, it is a simple and feasible alternative to design a high-gain antenna with specific functions and match it with an ordinary transmitter (including signal source and power amplifier) ​​to form an electric field sensitivity test system to achieve high field strength. In this solution, when the transmitter is certain, it is particularly important to design a wide-band antenna with small size, high integration, low cost and high gain, and use it in conjunction with the transmitter to generate an electric field environment of at least 744V / m. Summary of the invention

[0006] The embodiment of the present invention provides a Ku-band high-field-strength electric field sensitivity test system, which can meet the requirements of small size, high integration, low cost, and wide bandwidth under a certain transmitter, and can generate the required high-field-strength external radio frequency electromagnetic environment of at least 744V / m, and perform electric field sensitivity test in this high-field-strength external radio frequency electromagnetic environment. The test system itself also has high flexibility, environmental adaptability, and mechanical strength. The system includes:

[0007] The transmitter, Ku-band high-field-strength electric field sensitivity test antenna and field-strength probe connected in sequence;

[0008] The transmitter is used to: generate an excitation signal and input it into a Ku-band high-field-strength electric field sensitivity test antenna;

[0009] The Ku-band high-field-strength electric field sensitivity test antenna comprises a first rectangular waveguide, a moment-moment waveguide converter, a second rectangular waveguide, an angled horn and a reflective curved surface connected in sequence;

[0010] The perimeter of the first rectangular waveguide cross section is smaller than the perimeter of the second rectangular waveguide cross section;

[0011] The angular horn includes four side surfaces, and the four side surfaces are formed by respectively extending the size of a rectangular waveguide toward four sides;

[0012] The reflective curved surface is obtained by rotating a curve and is supported by an angular horn, and a radiation aperture is formed between the side surface of the angular horn and the reflective curved surface;

[0013] A first rectangular waveguide, used to convert an excitation signal of a receiver transmitter into an electromagnetic wave;

[0014] a rectangular-to-rectangular waveguide converter for transferring the electromagnetic wave to a second rectangular waveguide;

[0015] a second rectangular waveguide for transmitting the electromagnetic wave to the horn;

[0016] Angle horn, used to radiate electromagnetic waves onto a reflective curved surface in a directional radiation manner;

[0017] The reflective surface is used to reflect the electromagnetic wave into a quasi-plane wave and radiate it into the free space directly in front of the radiation aperture;

[0018] The field intensity probe is used to receive the quasi-plane wave radiated from the reflective curved surface into the free space, and measure the electric field intensity of the received quasi-plane wave.

[0019] The embodiment of the present invention also provides a design method for the aforementioned Ku-band high-field-strength electric field sensitivity test system, which can design an antenna that meets the requirements of small size, high integration, low cost, wide bandwidth, and can generate the required high-field-strength external radio frequency electromagnetic environment of at least 744V / m under a certain transmitter. The designed test system can perform electric field sensitivity testing in this high-field-strength external radio frequency electromagnetic environment, and the test system itself also has high flexibility, environmental adaptability and mechanical strength. The design method includes:

[0020] Determine the index parameters of transmitter and field strength probe;

[0021] The following steps are used to design the Ku-band high-field strength electric field sensitivity test antenna:

[0022] Construct an electromagnetic simulation model for the Ku-band high-field-strength electric field sensitivity test antenna;

[0023] Calculate the target gain of the Ku-band high-field-strength electric field sensitivity test antenna based on the target field strength, the transmitter's transmission power, and the distance directly in front of the center point of the radiation aperture;

[0024] In the electromagnetic simulation model, the structural parameter variables of the Ku-band high-field strength electric field sensitivity test antenna are scanned and jointly debugged to determine the values ​​of the structural parameter variables that meet the target gain. The structural parameter variables include the size of the second rectangular waveguide, the size of the angular horn and the size of the reflective surface. The size of the second rectangular waveguide includes length, width and height, the size of the angular horn includes the main body structure parameter variable and the angular degree parameter variable, and the size of the reflective surface includes the focal length of the reflective quadratic surface and the size of the radiation aperture.

[0025] The embodiment of the present invention also provides a design device for the aforementioned Ku-band high-field-strength electric field sensitivity test system, which can design an antenna that meets the requirements of small size, high integration, low cost, wide bandwidth, and can generate the required high-field-strength external radio frequency electromagnetic environment of at least 750V / m under a certain transmitter. The designed test system can perform electric field sensitivity test in this high-field-strength external radio frequency electromagnetic environment, and the test system itself also has high flexibility, environmental adaptability and mechanical strength. The design device includes: a first design module and a second design module;

[0026] The first design module is used to determine the index parameters of the transmitter and the field strength probe;

[0027] The second design module includes:

[0028] Model building module, used to build the electromagnetic simulation model of the Ku-band high-field strength electric field sensitivity test antenna;

[0029] The target gain calculation module is used to calculate the target gain of the Ku-band high-field-strength electric field sensitivity test antenna according to the target field strength, the transmitter's transmission power and the distance directly in front of the center point of the radiation aperture;

[0030] The parameter determination module is used to scan and jointly debug the structural parameter variables of the Ku-band high-field strength electric field sensitivity test antenna in an electromagnetic simulation model to determine the values ​​of the structural parameter variables that meet the target gain, wherein the structural parameter variables include the size of the second rectangular waveguide, the size of the angular horn and the size of the reflective surface. The size of the second rectangular waveguide includes length, width and height, the size of the angular horn includes a main body structural parameter variable and an angular degree parameter variable, and the size of the reflective surface includes the focal length of the reflective quadratic surface and the size of the radiation aperture.

[0031] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned design method of the Ku-band high-field-strength electric field sensitivity test system when executing the computer program.

[0032] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the design method of the above-mentioned Ku-band high-field strength electric field sensitivity test system is implemented.

[0033] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the design method of the above-mentioned Ku-band high-field-strength electric field sensitivity test system is implemented.

[0034] In an embodiment of the present invention, a Ku-band high-field-strength electric field sensitivity test antenna in a test system includes: a first rectangular waveguide, a moment-moment waveguide converter, a second rectangular waveguide, an angled horn and a reflective curved surface connected in sequence, and the overall structure meets the requirements of small size, high integration and low cost, and can be processed and formed in an integrated manner; the reflective curved surface is obtained by rotating a curve and is supported by the angled horn, and a radiation aperture is formed between the side of the angled horn and the reflective curved surface. The above design makes the angled horn and the reflective curved surface an integrated design; the structure of the angled horn and the reflective curved surface can generate a wide frequency band and a high field strength; the moment-moment waveguide converter can not excite a high-order mode and ensure that the electromagnetic wave is in the main mode TE as much as possible. 10 The antenna transmits the electromagnetic wave in the form of waves, realizing the smooth transition of electromagnetic waves; the horn plays the role of impedance transition to convert the waveguide mode into space waves; the reflective surface can gather and reflect the electromagnetic waves radiated by the horn, and radiate them into free space through the radiation aperture in the form of narrow beam plane waves, thereby generating a high-field strength external RF electromagnetic environment. The above antenna itself also has high flexibility, environmental adaptability and mechanical strength; therefore, the Ku-band high-field strength electric field sensitivity test system containing the above antenna can perform electric field sensitivity testing in this high-field strength external RF electromagnetic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. 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 creative work. In the drawings:

[0036] Figure 1 It is a structural schematic diagram of a Ku-band high-field-strength electric field sensitivity test system in an embodiment of the present invention;

[0037] Figure 2 It is a schematic structural diagram of a Ku-band high-field-strength electric field sensitivity test antenna according to an embodiment of the present invention;

[0038] Figure 3 Schematic diagram of a Ku-band high-field-strength electric field sensitivity test in an embodiment of the present invention;

[0039] Figure 4 It is a flow chart of a design method of a Ku-band high-field-strength electric field sensitivity test system in an embodiment of the present invention;

[0040] Figure 5 It is a schematic diagram of structural parameter variables of a Ku-band high-field-strength electric field sensitivity test antenna in an embodiment of the present invention;

[0041] Figure 6 It is a structural schematic diagram of a design device of a Ku-band high-field-strength electric field sensitivity test system in an embodiment of the present invention;

[0042] Figure 7 is a one-dimensional curve of the E-plane field strength at 11 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention;

[0043] Figure 8 is a one-dimensional curve of the H-plane field strength at 11 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention;

[0044] Fig. 9 is the two-dimensional distribution of the field intensity at 11 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention;

[0045] Fig.10 is a one-dimensional curve of the E-plane field strength at 14 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention;

[0046] Fig.11 is a one-dimensional curve of the H-plane field strength at 14 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention;

[0047] Fig.12 is the two-dimensional distribution of the field intensity at 14 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention;

[0048] Fig.13 is a one-dimensional curve of the E-plane field strength at 18 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention;

[0049] Fig.14 is a one-dimensional curve of H-plane field strength at 18 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention;

[0050] Fig.15 is the two-dimensional distribution of the field intensity at 18 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention;

[0051] Fig.16 The curve of the field intensity at a position 1 m away from the center of the antenna aperture at the Ku-band high-field-strength electric field sensitivity test antenna under an input power of 45 W in an embodiment of the present invention versus frequency;

[0052] Fig.17 Schematic diagram of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0053] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0054] Figure 1 Schematic diagram of the structure of the Ku-band high field strength electric field sensitivity test system in an embodiment of the present invention, Figure 2 The structure diagram of the Ku-band high-field-strength electric field sensitivity test antenna in the embodiment of the present invention is shown in FIG. 1 , wherein the system comprises: a transmitter 20, a Ku-band high-field-strength electric field sensitivity test antenna 10 and a field strength probe 30 connected in sequence;

[0055] The transmitter 20 is used to: generate an excitation signal and input it into a Ku-band high-field-strength electric field sensitivity test antenna;

[0056] The Ku-band high-field-strength electric field sensitivity test antenna 10 comprises a first rectangular waveguide 101, a moment-moment waveguide converter 102, a second rectangular waveguide 103, an angled horn and a reflective curved surface 108 connected in sequence;

[0057] The perimeter of the cross section of the first rectangular waveguide 101 is smaller than the perimeter of the cross section of the second rectangular waveguide 103;

[0058] The angular horn includes four side surfaces, and the four side surfaces are formed by respectively extending the size of a rectangular waveguide toward four sides;

[0059] The reflective curved surface 108 is obtained by rotating a curve and is supported by an angular horn, and a radiation aperture is formed between the side of the angular horn and the reflective curved surface;

[0060] The first rectangular waveguide 101 is used to convert the excitation signal of the transmitter into an electromagnetic wave;

[0061] A rectangular-to-rectangular waveguide converter 102 for transferring the electromagnetic wave to a second rectangular waveguide 103;

[0062] A second rectangular waveguide 103, used to transmit electromagnetic waves to the angular horn;

[0063] An angled horn, used to radiate electromagnetic waves onto the reflective curved surface 108 in a directional radiation manner;

[0064] The reflective curved surface 108 is used to reflect the electromagnetic wave into a quasi-plane wave and radiate it into the free space directly in front of the radiation aperture;

[0065] The field intensity probe 30 is used to receive the quasi-plane wave radiated into the free space by the reflective curved surface 108 and measure the electric field intensity of the received quasi-plane wave.

[0066] In the embodiment of the present invention, the first rectangular waveguide, the moment-moment waveguide converter, the second rectangular waveguide, the angular horn and the reflective curved surface are sequentially connected, and the overall structure meets the requirements of small size, high integration and low cost, and can be formed in an integrated manner; the reflective curved surface is obtained by rotating the curve and is supported by the angular horn, and a radiation aperture is formed between the side of the angular horn and the reflective curved surface. The above design makes the angular horn and the reflective curved surface an integrated design; the structure of the angular horn and the reflective curved surface can generate a wide bandwidth and a high field strength; the moment-moment waveguide converter can not excite high-order modes and ensure that the electromagnetic wave is in the main mode TE as much as possible. 10 The antenna transmits the electromagnetic wave in the form of waves, realizing the smooth transition of electromagnetic waves; the horn plays the role of impedance transition to convert the waveguide mode into space waves; the reflective surface can gather and reflect the electromagnetic waves radiated by the horn, and radiate them into free space through the radiation aperture in the form of narrow beam plane waves, thereby generating a high-field strength external RF electromagnetic environment. The above antenna itself also has high flexibility, environmental adaptability and mechanical strength; therefore, the Ku-band high-field strength electric field sensitivity test system containing the above antenna can perform electric field sensitivity testing in this high-field strength external RF electromagnetic environment.

[0067] According to the different frequency bands in which the Ku-band high field strength electric field sensitivity test antenna operates, the waveguide port of the first rectangular waveguide is designed to have corresponding universal specifications and dimensions so as to be connected to the other end of the SMA coaxial connector of a transmitter having an excitation signal connected to one end.

[0068] In one embodiment, the transmitter 20 includes a signal source and a power amplifier;

[0069] The signal source is used to: send an excitation signal;

[0070] The power amplifier is used to amplify the excitation signal and input it into the Ku-band high-field-strength electric field sensitivity test antenna.

[0071] It can be seen that in the embodiment of the present invention, the excitation signal power can be directly input from the signal source, or can be input from the signal source after passing through a power amplifier.

[0072] In one embodiment, the first rectangular waveguide is BJ140, and the long side h1 of the rectangular waveguide is 15.8 mm, and the short side h2 is 7.9 mm.

[0073] In one embodiment, the rectangular-rectangular waveguide converter 102 is a tapered hexahedron with a tapered structure. The size of the rectangular bottom surface of the hexahedron is consistent with the size of the first rectangular waveguide 101, and the top surface of the hexahedron is a square.

[0074] The side length of the square on the top surface of the hexahedron is W0, the length of the second rectangular waveguide is L0, the width is W0, and the height is H0, which will be determined later through design. In addition, the top surface of the hexahedron can also be designed as a rectangle, which can be changed according to needs. Since the cutoff wavelengths of the second rectangular waveguides of different calibers are different, in order not to excite higher-order modes and to ensure that the electromagnetic waves are transmitted in the form of main mode TE10 waves as much as possible, a moment-moment waveguide converter is used between the first rectangular waveguide and the second rectangular waveguide for smooth energy transition.

[0075] In one embodiment, the reflective curved surface 108 includes but is not limited to a parabola, a B-spline curve shaped reflective surface, a Bezier curve shaped reflective surface, a high-order ellipsoidal surface, and a high-order hyperbolic surface.

[0076] The horn aperture of the horn can be any reflective curved surface, but the curved surface should be able to reflect the outgoing wave radiated from the horn mouth into a narrow beam plane wave. The horn plays the role of impedance transition to convert the waveguide mode into a spatial wave. The smoothness of the impedance transition will directly affect the return loss and other performances of the antenna. Its length should be greater than half of the wavelength of the lowest operating frequency, so as to ensure that no high-order mode is excited during the impedance conversion process. When the impedance Z of the horn part satisfies equations (1) and (2), the smoothness of the impedance transition is better.

[0077] In one embodiment, the impedance Z of the angular speaker satisfies the relationship expressed by the following formula:

[0078] (1)

[0079] (2)

[0080] in, is the characteristic impedance of TE10 mode when the frequency is infinite; m is a constant, which is determined by the impedance at the midpoint of the horn being the average value of the impedance at both ends; is the variable of the angular horn length.

[0081] In one embodiment, the angular horn includes a first side surface 104, a second side surface 105, a third side surface 106 and a fourth side surface 107 which are arranged in sequence, and the lengths of the first side surface 104 and the third side surface 106 are respectively greater than those of the second side surface 105, and the lengths of the first side surface 104 and the third side surface 106 are respectively greater than those of the fourth side surface 107.

[0082] In one embodiment, the reflective curved surface 108 is supported by the fan-shaped surfaces of the first side surface 104, the second side surface 105 and the third side surface 106 of the angular horn;

[0083] The radiation aperture is formed between the first side surface 104 , the fourth side surface 107 , the third side surface 106 and the reflective curved surface.

[0084] The lengths of the first side surface 104 and the third side surface 106 may be equal or unequal; the lengths of the second side surface 105 and the fourth side surface 107 may be equal or unequal, depending on actual conditions.

[0085] from Figure 1 It can be seen that this radiation aperture is approximately a trapezoid. Electromagnetic waves radiate from the radiation aperture to the front and form a high field strength area. The angular horn body of the entire antenna and the reflective surface are integrated into an integrated design. This integrated design method does not require additional support rod structures to fix it like traditional parabolic antennas or Cassegrain antennas, which results in the disadvantage of being too large in size, and can also achieve integrated processing and manufacturing. The antenna structure and design method are applicable and can be extended to high field strength generation of antennas in other frequency bands, and its structural size will change. See. Figure 3 Schematic diagram of the Ku-band high-field strength electric field sensitivity test in an embodiment of the present invention. The electric field strength of the antenna is measured at a position R meters in front of the center point of the radiation aperture.

[0086] In order to analyze the electric field strength of the antenna, the key factors affecting the field strength in the high field strength area in the entire RF link generated by the high field strength are analyzed below.

[0087] A radio frequency link consisting of a receiver and a transmitter is calculated from the perspective of the outgoing wave at the transmitting end of the link. According to the power transmission theory, the gain for the distance is G t The maximum radiation power spectrum density S of the directional transmitting antenna at the radiation aperture R meters can be expressed by formula (3):

[0088] (3)

[0089] Among them, P t is the transmitting power of the transmitter, G t is the gain of the transmitting antenna (ie, the antenna in the embodiment of the present invention), and R is the distance between the transmitting antenna in the transmitter and the receiving antenna in the receiver.

[0090] On the other hand, according to the reciprocity relationship between the transmitting and receiving antennas, the incident wave angle at the receiving end of the link can be examined and calculated. At the same time, the electromagnetic wave can be described in the form of electric field and magnetic field. When the electromagnetic wave emitted by the transmitting antenna is transmitted to the receiving antenna through free space, the incident wave power spectrum density S (that is, the electromagnetic energy flow density) received by the receiving antenna at a distance of R meters from the transmitting antenna radiation aperture can be expressed by formula (4):

[0091] (4)

[0092] in, and are the electric field vector and magnetic field vector of the electromagnetic wave, respectively. is the wave impedance of electromagnetic waves, and in free space .

[0093] By combining equations (3) and (4), we can get the field strength E at a position R meters in front of the center point of the radiation aperture as follows:

[0094] (5)

[0095] Among them, k is a constant coefficient, G t is the gain of the antenna, P t is the transmission power of the transmitter.

[0096] From formula (5), we can get the field strength value E in the high field strength area and the excitation signal power (i.e., the transmission power of the transmitter) P at the antenna input end generated by the field strength: t is proportional to the antenna gain G t The excitation signal power at the antenna input is also directly proportional to the gain of the antenna.

[0097] The embodiment of the present invention further proposes a design method for a Ku-band high-field-strength electric field sensitivity test system, which is applied to the aforementioned Ku-band high-field-strength electric field sensitivity test antenna. Figure 4 The flowchart of the design method of the Ku-band high-field-strength electric field sensitivity test system in the embodiment of the present invention includes:

[0098] Step 401, determining the index parameters of the transmitter and the field strength probe;

[0099] Step 402, designing a Ku-band high-field-strength electric field sensitivity test antenna using the following steps:

[0100] Step 4021, constructing an electromagnetic simulation model of a Ku-band high-field-strength electric field sensitivity test antenna;

[0101] Step 4022, calculating the target gain of the Ku-band high-field-strength electric field sensitivity test antenna according to the target field strength, the transmission power of the transmitter and the distance in front of the center point of the radiation aperture;

[0102] Step 4023, in the electromagnetic simulation model, the structural parameter variables of the Ku-band high-field strength electric field sensitivity test antenna are scanned and jointly debugged to determine the values ​​of the structural parameter variables that meet the target gain, the structural parameter variables include the size of the second rectangular waveguide, the size of the angular horn and the size of the reflective surface, the size of the second rectangular waveguide includes length, width and height, the size of the angular horn includes the main body structure parameter variable, the angular degree parameter variable, the size of the reflective surface includes the focal length of the reflective quadratic surface and the size of the radiation aperture.

[0103] In step 4022, the target gain is calculated using the following formula:

[0104] (6)

[0105] Figure 5 The schematic diagram of the structural parameter variables of the Ku-band high field strength electric field sensitivity test antenna in the embodiment of the present invention is shown in FIG. The dimensions of the second rectangular waveguide include length L0, width W0, and height H0, the dimensions of the angular horn include body structural parameter variables L1, L2, angular degree parameter variables θ0, θ1, and the dimensions of the reflective surface include the focal length f of the reflective quadratic surface and the size of the radiation aperture D / 2.

[0106] Through the above design, a unique Ku-band high-field-strength electric field sensitivity test antenna that meets the target gain value at the corresponding frequency can be obtained.

[0107] The embodiment of the present invention also provides a design device for a Ku-band high-field-strength electric field sensitivity test system. Figure 6 60 is a schematic diagram of the structure of a design device for a Ku-band high-field-strength electric field sensitivity test system according to an embodiment of the present invention, comprising: a first design module 601 and a second design module 602;

[0108] The first design module 601 is used to determine the index parameters of the transmitter and the field strength probe;

[0109] The second design module 602 includes:

[0110] A model building module 6021 is used to build an electromagnetic simulation model of a Ku-band high-field-strength electric field sensitivity test antenna;

[0111] The target gain calculation module 6022 is used to calculate the target gain of the Ku-band high-field-strength electric field sensitivity test antenna according to the target field strength, the transmission power of the transmitter and the distance directly in front of the center point of the radiation aperture;

[0112] The parameter determination module 6023 is used to scan and jointly debug the structural parameter variables of the Ku-band high-field strength electric field sensitivity test antenna in the electromagnetic simulation model to determine the values ​​of the structural parameter variables that meet the target gain. The structural parameter variables include the size of the second rectangular waveguide, the size of the angular horn and the size of the reflective surface. The size of the second rectangular waveguide includes length, width and height. The size of the angular horn includes the main body structure parameter variable and the angular degree parameter variable. The size of the reflective surface includes the focal length of the reflective quadratic surface and the size of the radiation aperture.

[0113] The solution proposed in the embodiment of the present invention is introduced below with reference to the accompanying drawings.

[0114] See also Figure 3 , by inputting a useful excitation signal at the port of the first rectangular waveguide 101 of the Ku-band high-field-strength electric field sensitivity test antenna, the excitation signal can be directly emitted by the signal source, or can be emitted by the signal source after connecting to a power amplifier, etc., which can be selected by the user. The excitation signal will pass through the moment-moment waveguide converter 102 in the form of a main mode TE10 electromagnetic wave, and enter the cascaded second rectangular waveguide 103 and the horn horn in sequence, and then the horn horn radiates the electromagnetic wave energy to the reflective surface 108 (in this embodiment, a parabolic reflection quadratic surface is used) in a directional radiation manner, and finally is reflected by the quadratic surface and radiated to the free space in the form of a quasi-plane wave in front of the aperture surface, thereby generating a high-field-strength external radio frequency electromagnetic environment with the required electric field strength; then, the field strength probe with the maximum range covering the maximum electric field strength generated in the entire frequency band receives the quasi-plane wave radiated from the reflective surface 108 to the free space, and measures the electric field strength of the received quasi-plane wave, and through repeated electric field strength tests, the Ku-band high-field-strength electric field sensitivity test is realized.

[0115] Under the same input power, the magnitude of the field strength generated by the Ku-band high-field-strength electric field sensitivity test antenna will theoretically increase with the increase of the operating frequency. Therefore, if the field strength value generated by the proposed Ku-band high-field-strength electric field sensitivity test antenna can reach 744 V / m at the lowest operating frequency of 11 GHz, then the field strength value of the Ku-band high-field-strength electric field sensitivity test antenna in theory is above 744 V / m in the entire Ku frequency band. Here, the input power of the antenna is taken as 45 W (i.e., the transmission power P of the power amplifier in the transmitter). t ), and the field strength E of the target's expected high field strength area is 750 v / m when it is 1 meter in front of the antenna radiation aperture (R=1m). According to the above formula (6), when the field strength value generated by the Ku-band high field strength electric field sensitivity test antenna is 750 v / m, the gain value that the antenna needs to achieve at least can be calculated. After formula derivation and theoretical calculation, the gain G of the designed Ku-band high field strength electric field sensitivity test antenna ist is 26 dB, so for this embodiment, when the gain of the designed ku-band high-field-strength electric field sensitivity test antenna exceeds 26 dB, the desired field strength value can be achieved. Then, all structural parameter variables of the ku-band high-field-strength electric field sensitivity test antenna (including the rectangular waveguide length L0, width W0, height H0, speaker body structural parameter variables L1, L2, angle parameter variables θ0, θ1 of the angle speaker, and the focal length f and radiation aperture size D of the parabolic reflection quadratic surface) are scanned and jointly debugged in the electromagnetic simulation software, and the gain G of the ku-band high-field-strength electric field sensitivity test antenna at the corresponding frequency calculated above is used. t As the optimization design goal, the target gain G can be obtained. t A set of corresponding Ku-band high-field-strength electric field sensitivity test antenna structure variable values ​​under the condition are shown in Table 1. Finally, the specific structure of the Ku-band high-field-strength electric field sensitivity test antenna that meets the 750 V / m high-field-strength requirement can be determined and obtained by the values ​​of this set of structural parameter variables.

[0116] Table 1

[0117]

[0118] After numerical simulation of the field strength of the designed Ku-band high-field-strength electric field sensitivity test antenna at 11 GHz, the field strength distribution of the antenna at a position 1 m away from the center of the antenna radiation aperture is obtained as follows: Figure 7-Figure 9 As shown, Figure 7 is a one-dimensional curve of the E-plane field strength at 11 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention, Figure 8 is a one-dimensional curve of the H-plane field strength at 11 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention, Fig. 9 It is the two-dimensional distribution of the field strength at 11 GHz at a position 1 m away from the center of the antenna radiation aperture in the embodiment of the present invention. In order to further verify the field strength characteristics of the Ku-band high-field-strength electric field sensitivity test antenna in the Ku full-band, the designed Ku-band high-field-strength electric field sensitivity test antenna was selected at 14 GHz and 18 GHz frequencies and numerical simulation was performed. The field strength distribution of the antenna at a position 1 m away from the center of the antenna aperture is shown as follows: Figure 10-12 As shown, and Figure 13-Figure 15 shown. Fig.10 is a one-dimensional curve of the E-plane field strength at 14 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention, Fig.11 is a one-dimensional curve of the H-plane field strength at 14 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention, Fig.12: is the two-dimensional distribution of the field strength at 14 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention. Fig.13 is a one-dimensional curve of the E-plane field strength at 18 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention, Fig.14 is a one-dimensional curve of the H-plane field strength at 18 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention, Fig.15 : is the two-dimensional distribution of the field strength at 18 GHz at a position 1 m away from the center of the antenna radiation aperture in an embodiment of the present invention. Fig.16 This is a curve of field strength variation with frequency at a position 1 m away from the center of the antenna aperture of the Ku-band high field strength electric field sensitivity test antenna under an input power of 45 W in an embodiment of the present invention. It can be seen that the field strength generated by the antenna in the entire frequency band is greater than 750 V / m, and reaches 2.3 kV / m at 18 GHz, which can meet the field strength value required by the equipment in the high field strength standard in the Ku band; thereby completing the Ku-band high field strength electric field sensitivity test.

[0119] in addition, Fig. 9 , Fig.12 and Fig.15 The two-dimensional field distribution diagram of the field intensity at different frequencies generated by the system proposed by the embodiment of the present invention presents a concentric circle focusing effect, and the energy gradually weakens toward the periphery.

[0120] In summary, the solution proposed in the embodiment of the present invention has the following beneficial effects:

[0121] The requirement of generating high field strength (e.g., 750 V / m field strength) in the Ku band is achieved. Compared with the phased array radar irradiation method and the method of increasing the power source transmission power, the proposed Ku-band high field strength electric field sensitivity test antenna method can generate a high field strength that meets the requirements even with a relatively low signal source and power amplifier (e.g., the rated power is only 100W). It is simpler and easier to use in practice, and has the advantages of low cost, good flexibility, and the ability to carry out Ku-band high field strength generation tests in ordinary darkrooms. At the same time, the Ku-band high field strength electric field sensitivity test antenna is more compact and stable than the traditional bracket support structure of the offset-fed or forward-fed parabolic reflector antenna, and has better integration and is easy to integrate. Therefore, the Ku-band high field strength electric field sensitivity test system including the above antenna can perform electric field sensitivity tests in this high field strength external RF electromagnetic environment.

[0122] An embodiment of the present invention further provides a computer device, Fig.17It is a schematic diagram of a computer device in an embodiment of the present invention. The computer device 1700 includes a memory 1710, a processor 1720, and a computer program 1730 stored in the memory 1710 and executable on the processor 1720. When the processor 1720 executes the computer program 1730, the design method of the above-mentioned Ku-band high field strength electric field sensitivity test system is implemented.

[0123] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the design method of the above-mentioned Ku-band high-field strength electric field sensitivity test system is implemented.

[0124] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the design method of the above-mentioned Ku-band high-field-strength electric field sensitivity test system is implemented.

[0125] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0126] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0127] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0128] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0129] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A Ku-band high-field strength electric field sensitivity test system, characterized in that: A transmitter (20), a Ku-band high-field-strength electric field sensitivity test antenna (10), and a field-strength probe (30) connected in sequence; The transmitter (20) is used to: generate an excitation signal and input it into a Ku-band high-field-strength electric field sensitivity test antenna; The Ku-band high-field-strength electric field sensitivity test antenna comprises a first rectangular waveguide (101), a moment-to-moment waveguide converter (102), a second rectangular waveguide (103), an angled horn and a reflective curved surface (108) connected in sequence; The perimeter of the cross section of the first rectangular waveguide (101) is smaller than the perimeter of the cross section of the second rectangular waveguide (103); The angular horn includes four side surfaces, and the four side surfaces are formed by respectively extending the size of a rectangular waveguide toward four sides; The reflective curved surface (108) is obtained by rotating the curve and is supported by the angular horn, and a radiation aperture is formed between the side surface of the angular horn and the reflective curved surface; A first rectangular waveguide (101), used for converting an excitation signal of a transmitter into an electromagnetic wave; A rectangular-to-rectangular waveguide converter (102) for transferring the electromagnetic wave to a second rectangular waveguide (103); A second rectangular waveguide (103) for transmitting electromagnetic waves to the angular horn; An angled horn, used to radiate electromagnetic waves onto a reflective curved surface (108) in a directional radiation manner; The reflective curved surface (108) is used to reflect the electromagnetic wave into a quasi-plane wave and radiate it into free space directly in front of the radiation aperture; The field intensity probe is used to receive a quasi-plane wave radiated from the reflective curved surface (108) into free space, and to measure the electric field intensity of the received quasi-plane wave.

2. The system according to claim 1, characterized in that The transmitter (20) comprises a signal source and a power amplifier; The signal source is used to: send an excitation signal; The power amplifier is used to amplify the excitation signal and input it into the Ku-band high-field-strength electric field sensitivity test antenna.

3. The system according to claim 1, characterized in that The rectangular-rectangular waveguide converter (102) is a tapered hexahedral conical structure, the size of the rectangular bottom surface of the hexahedron is consistent with the size of the first rectangular waveguide (101), and the top surface of the hexahedron is a square.

4. The system according to claim 1, characterized in that The angular horn comprises a first side surface (104), a second side surface (105), a third side surface (106) and a fourth side surface (107) which are arranged in sequence, wherein the lengths of the first side surface (104) and the third side surface (106) are respectively greater than the lengths of the second side surface (105), and the lengths of the first side surface (104) and the third side surface (106) are respectively greater than the lengths of the fourth side surface (107).

5. The system according to claim 4, characterized in that The reflective curved surface (108) is supported by the fan-shaped surfaces of the first side surface (104), the second side surface (105) and the third side surface (106) of the angular horn; The radiation aperture is formed between the first side surface (104), the fourth side surface (107), the third side surface (106) and the reflective curved surface.

6. The system according to claim 1, wherein: The reflective surface (108) includes but is not limited to a parabola, a B-spline curve shaped reflective surface, a Bezier curve shaped reflective surface, a high-order ellipsoidal surface and a high-order hyperbolic surface.

7. The system according to claim 1, characterized in that Directly in front of the center of the radiation aperture R Field strength at m E The expression is as follows: in, k is a constant coefficient, G t is the gain of the antenna, P t is the transmission power of the transmitter.

8. A design method for a Ku-band high-field-strength electric field sensitivity test system according to any one of claims 1 to 7, characterized in that: include: Determine the index parameters of transmitter and field strength probe; The following steps are used to design the Ku-band high-field strength electric field sensitivity test antenna: Construct an electromagnetic simulation model for the Ku-band high-field-strength electric field sensitivity test antenna; Calculate the target gain of the Ku-band high-field-strength electric field sensitivity test antenna based on the target field strength, the transmitter's transmission power, and the distance directly in front of the center point of the radiation aperture; In the electromagnetic simulation model, the structural parameter variables of the Ku-band high-field strength electric field sensitivity test antenna are scanned and jointly debugged to determine the values ​​of the structural parameter variables that meet the target gain. The structural parameter variables include the size of the second rectangular waveguide, the size of the angular horn and the size of the reflective surface. The size of the second rectangular waveguide includes length, width and height, the size of the angular horn includes the main body structure parameter variable and the angular degree parameter variable, and the size of the reflective surface includes the focal length of the reflective quadratic surface and the size of the radiation aperture.

9. A design device for a Ku-band high-field-strength electric field sensitivity test system according to any one of claims 1 to 7, characterized in that: include: a first design module and a second design module; The first design module is used to determine the index parameters of the transmitter and the field strength probe; The second design module includes: Model building module, used to build the electromagnetic simulation model of the Ku-band high-field strength electric field sensitivity test antenna; The target gain calculation module is used to calculate the target gain of the Ku-band high-field-strength electric field sensitivity test antenna according to the target field strength, the transmitter's transmission power and the distance directly in front of the center point of the radiation aperture; The parameter determination module is used to scan and jointly debug the structural parameter variables of the Ku-band high-field strength electric field sensitivity test antenna in an electromagnetic simulation model to determine the values ​​of the structural parameter variables that meet the target gain, wherein the structural parameter variables include the size of the second rectangular waveguide, the size of the angular horn and the size of the reflective surface. The size of the second rectangular waveguide includes length, width and height, the size of the angular horn includes a main body structural parameter variable and an angular degree parameter variable, and the size of the reflective surface includes the focal length of the reflective quadratic surface and the size of the radiation aperture.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method of claim 8 is implemented.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method of claim 8 is implemented.

12. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method of claim 8 is implemented.

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