Self-adaptive strong electromagnetic signal attenuation adjusting device and adjusting method

Abstract

The invention discloses a self-adaptive strong electromagnetic signal attenuation adjusting device and method, and the device comprises a rectangular waveguide (1), a coaxial structure (2) is connected into an opening at a quarter wavelength position away from the tail end of the rectangular waveguide (1) to form a wave-same conversion interface, the tail end of the rectangular waveguide (1) is filled with an electro-optical effect dielectric material (3), and the electro-optical effect dielectric material (3) is sealed by metal; the adjustment method comprises the following steps: step 1, designing a self-adaptive strong electromagnetic signal attenuation adjustment device with an electro-optical effect dielectric material for a specific frequency range; 2, self-adaptive attenuation of the strong electromagnetic signal is realized; the problem that when a traditional fixed-value attenuator receives a strong electromagnetic signal, a plurality of attenuators are needed to enable a signal to be detected to adapt to the input level of a rear-end detector is solved. Along with the use of strong electromagnetic equipment, the attenuation method is difficult to meet the increasing rapid detection requirement, and the like.

Description

Technical Field

[0001] The invention belongs to the field of high-power microwave electromagnetic effect and electromagnetic compatibility testing, and in particular relates to an adaptive strong electromagnetic signal attenuation adjustment device and an adjustment method. Background Art

[0002] In recent years, with the rapid development of electromagnetic energy, strong electromagnetic signals represented by high-power microwaves have become the focus of increasing attention. Strong electromagnetic environments pose a huge threat to the safety of electronic equipment. Especially when conducting strong electromagnetic environment tests, the strong electromagnetic environment needs to be pre-evaluated and then the attenuator is gradually replaced to make the signal reach a level that the acquisition circuit can withstand. The test efficiency is low and it is difficult to meet the needs of rapid testing.

[0003] Although the traditional fixed-value attenuator can achieve the attenuation of strong electromagnetic signals, its attenuation value is fixed. When receiving strong electromagnetic signals, in order to prevent the back-end acquisition circuit from being damaged, it is necessary to perform attenuation, and then gradually replace the attenuator with a smaller attenuation value according to the acquisition circuit level signal. The structure is complex, with many combinations, and even multiple attenuators are required to achieve the signal to be tested to adapt to the input level of the back-end detector. With the use of strong electromagnetic equipment, this type of attenuation method is difficult to meet the growing demand for rapid detection. Summary of the invention

[0004] The technical problem to be solved by the present invention is: to provide an adaptive strong electromagnetic signal attenuation adjustment device and an adjustment method to solve the technical problems that traditional fixed-value attenuators require multiple attenuators when receiving strong electromagnetic signals to achieve the level at which the signal to be measured adapts to the input level of the back-end detector. With the use of strong electromagnetic equipment, this type of attenuation method is difficult to meet the growing demand for rapid detection.

[0005] The technical solution of the present invention is: The invention discloses an adaptive strong electromagnetic signal attenuation regulating device, which comprises a rectangular waveguide, an opening at a quarter wavelength from the end of the rectangular waveguide is connected to a coaxial structure to form a wave-to-wave conversion interface, the end of the rectangular waveguide is filled with an electro-optic effect dielectric material, and the electro-optic effect dielectric material is sealed with metal.

[0006] The electro-optic effect dielectric material is a dielectric material having an electro-optic effect, including lithium niobate crystal.

[0007] A method for adjusting an adaptive strong electromagnetic signal attenuation adjustment device, comprising: Step 1.1, designing an adaptive strong electromagnetic signal attenuation regulating device with an electro-optical effect dielectric material for a specific frequency range; Step 1.2: Realize adaptive attenuation of strong electromagnetic signals.

[0008] The design of the adaptive strong electromagnetic signal attenuation adjustment device includes: Step 2.1, Typical S-band frequency range The inner section width of waveguide model WR-284 is 72.14±0.14mm, the inner section height is 34.04±0.14mm, the basic wall thickness of the waveguide is 2.03mm, and the length is 13.33cm; Step 2.2, according to the size of the inner cross-section of the S-rectangular waveguide WR-284, fill the end with a lithium niobate crystal of the electro-optical effect dielectric material with a size of 72.14mm*34.04mm*8mm and then use metal sealing; Step 2.3: Select an N-type interface that meets the frequency range requirements for the wave conversion interface to improve the stability of signal transmission.

[0009] Methods for achieving adaptive attenuation of strong electromagnetic signals include: Step 3.1, the front end of the rectangular waveguide receives a strong electromagnetic signal received by a high-power antenna; Step 3.2: The wave conversion interface transmits the attenuated signal to the subsequent circuit.

[0010] The beneficial effects of the present invention are: The electro-optical effect medium material used in the adaptive strong electromagnetic signal attenuation adjustment device of the present invention has the characteristic that the dielectric constant changes with the electric field, which changes the field distribution of the wave-to-wave conversion coupling part and causes the electromagnetic signal transmitted to the wave-to-wave conversion interface to attenuate.

[0011] The dielectric constant of the electro-optical effect dielectric material of the present invention changes linearly with the change of the electric field, and the S parameter of the wave-to-wave conversion changes linearly with the change of the dielectric material. This feature makes the value after attenuation traceable. In the S band, the S11 of the structure can be increased from -44dB to -0.46dB; The present invention can be expanded according to different frequency bands. Different frequency bands are mainly reflected in the changes in the size of the rectangular waveguide structure, the size of the coaxial line structure, and the size and thickness of the electro-optic effect medium material. It can be flexibly designed according to the usage scenario.

[0012] The solution solves the problem that when receiving strong electromagnetic signals, traditional fixed-value attenuators require multiple attenuators to achieve the level at which the signal to be tested can adapt to the input level of the back-end detector. With the use of strong electromagnetic equipment, this type of attenuation method is difficult to meet the growing demand for rapid detection and other technical problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of the adaptive strong electromagnetic signal attenuation adjustment device of the present invention; Figure 2 This is a schematic diagram of a use scenario of the adaptive strong electromagnetic signal attenuation adjustment device of the present invention; Figure 3This is a graph showing the change of the S11 parameter of the adaptive strong electromagnetic signal attenuation adjustment device according to the present invention as the external electric field changes; Figure 4 This is a graph showing the change of the S21 parameter of the adaptive strong electromagnetic signal attenuation adjustment device of the present invention as the external electric field changes. DETAILED DESCRIPTION

[0014] A self-adaptive strong electromagnetic signal attenuation adjustment device, the device comprises a rectangular waveguide 1, a coaxial structure 2 and an electro-optic effect dielectric material 3; the coaxial structure 2 is connected to an opening at a quarter wavelength from the end of the rectangular waveguide 1 to form a wave conversion interface, and the end of the rectangular waveguide 1 is connected to the electro-optic effect dielectric material 3; the electro-optic effect dielectric material 3 is a dielectric material with electro-optic effect, including lithium niobate crystal, etc.

[0015] The adaptive strong electromagnetic signal attenuation adjustment device of the present invention comprises a rectangular waveguide 1 for receiving strong electromagnetic signals; a coaxial structure 2 for connecting the rectangular waveguide and a subsequent circuit to achieve signal transmission; and an electro-optical effect dielectric material 3 is placed at the end of the rectangular waveguide 1, and its dielectric constant changes with the electric field strength, thereby changing the attenuation value.

[0016] A method for using an adaptive strong electromagnetic signal attenuation adjustment device comprises the following steps: Step 1: Construction of an adaptive strong electromagnetic signal attenuation adjustment device.

[0017] Step 1.1, design an adaptive strong electromagnetic signal attenuation adjustment device with electro-optic effect dielectric materials for a specific frequency range. According to the EIA-international standard, the inner section width of the waveguide model WR-284 in the typical S-band frequency range is 72.14±0.14mm, the inner section height is 34.04±0.14mm, the basic wall thickness of the waveguide is 2.03mm, and the length is 13.33cm.

[0018] Step 1.2, according to the inner cross-sectional size of the S-rectangular waveguide WR-284, fill the end with a typical electro-optical effect dielectric material lithium niobate crystal with a size of 72.14mm*34.04mm*8mm and then use metal sealing; Step 1.3: Select an N-type interface that meets the frequency range requirements for the wave conversion interface to improve the stability of signal transmission; Step 2: Realization of adaptive attenuation of strong electromagnetic signals.

[0019] Step 21, the front end of the rectangular waveguide receives a strong electromagnetic signal received by the high-power antenna; Step 2.2: The wave conversion interface transmits the attenuated signal to the subsequent circuit.

[0020] The electro-optic effect dielectric material at the end of the rectangular waveguide mainly plays the role of adaptive adjustment. The electro-optic effect refers to the change of the dielectric constant of the dielectric material with the change of the electric field intensity. When the power is low, the electric field intensity in the waveguide is low, the dielectric constant of the electro-optical effect medium material changes very slightly, and the attenuation value of the attenuation device remains almost unchanged, and the electromagnetic wave is not attenuated at this time; When the power is high, the electric field intensity in the waveguide is very high, and the dielectric constant of the electro-optic effect medium material changes significantly, so that the interface position between the coaxial structure and the waveguide is not at the position with the strongest electric field. The coupled energy drops sharply, and obvious attenuation occurs at this time, thereby realizing adaptive attenuation of strong electromagnetic signals based on the power size.

[0021] Figure 1 This is the structural diagram of the adaptive strong electromagnetic signal attenuation adjustment device of the present invention. It can be seen that the rectangular waveguide receives strong electromagnetic signals, the end of the rectangular waveguide is closed with metal, and the opening at a quarter wavelength from the end is connected to the coaxial structure to form a wave-to-coaxial conversion interface, and the coaxial structure inputs the signal into the subsequent circuit. An electro-optic effect dielectric material is placed inside the end of the waveguide to sense the strong electromagnetic environment and change the attenuation value by changing its own parameters.

[0022] Figure 2 It is a schematic diagram of the use scenario of the adaptive strong electromagnetic signal attenuation adjustment device of the present invention. It can be seen that the rectangular waveguide receives the strong electromagnetic signal, that is, port one is the strong electromagnetic signal input port, and the coaxial structure inputs the signal into the subsequent circuit, that is, port two is the converted electromagnetic signal output port.

[0023] Figure 3 The figure is the S11 parameter variation diagram of the adaptive strong electromagnetic signal attenuation adjustment device as the external electric field changes. It can be seen that S11 changes linearly with the increase of dielectric constant, and has good linear characteristics.

[0024] Figure 4 The figure is the S21 parameter variation diagram of the adaptive strong electromagnetic signal attenuation adjustment device as the external electric field changes. It can be seen that S21 decreases linearly with the increase of dielectric constant, and the attenuation effect changes linearly, which has good linear characteristics.

Claims

1. An adaptive strong electromagnetic signal attenuation adjustment device, characterized in that: The device comprises a rectangular waveguide (1), an opening at a distance of one quarter wavelength from the end of the rectangular waveguide (1) is connected to a coaxial structure (2) to form a wave-to-wave conversion interface, the end of the rectangular waveguide (1) is filled with an electro-optic effect dielectric material (3), and the electro-optic effect dielectric material (3) is sealed with metal.

2. The adaptive strong electromagnetic signal attenuation adjustment device according to claim 1, characterized in that: The electro-optic effect dielectric material (3) is a dielectric material having an electro-optic effect, and comprises lithium niobate crystal.

3. The method for adjusting the adaptive strong electromagnetic signal attenuation adjustment device according to claim 1, characterized in that: The method comprises: Step 1, designing an adaptive strong electromagnetic signal attenuation adjustment device with an electro-optical effect dielectric material for a specific frequency range; Step 2: Realize adaptive attenuation of strong electromagnetic signals.

4. The method for adjusting the adaptive strong electromagnetic signal attenuation adjustment device according to claim 3 is characterized in that: The design of the adaptive strong electromagnetic signal attenuation adjustment device includes: Step 2.1, Typical S-band frequency range The inner section width of waveguide model WR-284 is 72.14±0.14mm, the inner section height is 34.04±0.14mm, the basic wall thickness of the waveguide is 2.03mm, and the length is 13.33cm; Step 2.2, according to the inner cross-sectional size of the S-rectangular waveguide WR-284, fill the end with a lithium niobate crystal of electro-optical effect dielectric material of 72.14mm*34.04mm*8mm size and then use metal sealing; Step 2.3: Select an N-type interface that meets the frequency range requirements for the wave conversion interface to improve the stability of signal transmission.

5. The method for adjusting the adaptive strong electromagnetic signal attenuation adjustment device according to claim 3 is characterized in that: Methods for achieving adaptive attenuation of strong electromagnetic signals include: Step 3.1, the front end of the rectangular waveguide receives a strong electromagnetic signal received by a high-power antenna; Step 3.2: The wave conversion interface transmits the attenuated signal to the subsequent circuit.

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