Vehicle-mounted millimeter wave radar strong electromagnetic pulse protection device based on energy selective surface
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A millimeter-wave radar and energy selection technology, applied to antenna grounding devices, circuits, electrical components, etc., can solve the problems of lack of protection methods and fewer vehicle-mounted millimeter-wave radars
Pending Publication Date: 2022-02-25
JILIN UNIV
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Problems solved by technology
At present, there are relatively few researches on electromagnetic protection of vehicle-mounted millimeter-wave radars, and there is no effective protection method against vehicle-mounted millimeter-wave radars being interfered by strong electromagnetic pulses.
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Embodiment 1
[0032] Embodiment 1, the 24GHz vehicle-mounted millimeter-wave radar strong electromagnetic pulse protection device based on the energy selection surface mainly protects the millimeter-wave radar antenna. The present invention provides a millimeter-wave radar microstrip patch array antenna adapted to the device, and through simulation The software determines its performance within the guard and verifies the guard's electromagnetic shielding effectiveness. The microstrip patch array antenna is arranged in combination by the microstrip patch unit, and the design steps of the microstrip patch unit are as follows:
[0033] (1) Calculate the width W of the microstrip patch, and the empirical formula for calculating the width W of the microstrip patch is as follows:
[0034]
[0035] where c 0 is the speed of light in vacuum, f ris the operating frequency of the antenna, ε r is the relative permittivity of the dielectric plate;
[0036] (2) Calculate the effective permittivit...
Embodiment 2
[0051] Embodiment 2, the strong electromagnetic pulse antenna shield based on the energy selective surface.
[0052] A strong electromagnetic pulse antenna shield based on an energy selective surface includes a dielectric substrate, a band-pass frequency selective surface, and a PIN diode surface-mounted on the band-pass frequency selective surface.
[0053] In some embodiments, the dielectric substrate is made of Rogers RT5880 material (or brand materials such as taconic, arlon, and Isola), with a relative permittivity of 2.2, a loss tangent of 0.0009, a length of 48.0mm, a width of 32.0mm, and a thickness of 0.245mm. The band-pass frequency selective surface is on the upper surface of the dielectric substrate, and the working frequency is 24GHz.
[0054] The band-pass frequency selective surface is composed of M×N units, each unit is a square metal patch with a side length D, and a cross-shaped slit is etched on the square metal patch; outside the cross-shaped slit Cross a...
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Abstract
The invention relates to a vehicle-mounted millimeter wave radar strong electromagnetic pulse protection device based on an energy selective surface, and belongs to the field of strong electromagnetic pulse protection. The device comprises a strong electromagnetic pulse antenna protective cover based on the energy selective surface, wherein the strong electromagnetic pulse antenna protective cover based on the energy selective surface comprises a dielectric substrate, a band-pass frequency selective surface and a PIN diode surface-mounted on the band-pass frequency selective surface. The device has the advantages that the energy selective surface is used for electromagnetic protection of the vehicle-mounted millimeter-wave radar, when the electromagnetic wave energy is less than a safety threshold value, normal transmission can be carried out in a 24GHz passband, when the electromagnetic wave energy is greater than the safety threshold value, the protection efficiency of the vehicle-mounted millimeter-wave radar on strong electromagnetic pulses is maximized through moving of a working frequency band, and interference damage of high-altitude nuclear electromagnetic pulses, high-power microwaves and other strong electromagnetic pulses to the vehicle-mounted millimeter wave radar can be effectively prevented.
Description
technical field [0001] The invention relates to the field of strong electromagnetic pulse protection, in particular to a 24GHz vehicle-mounted millimeter-wave radar strong electromagnetic pulse protection device based on an energy selective surface. It can realize the electromagnetic protection of 24GHz vehicle-mounted millimeter-wave radar under strong electromagnetic pulse interference, protect the 24G vehicle-mounted millimeter-wave radar antenna array, improve its anti-interference ability and stability, and can be applied to military combat vehicles and civilian vehicles that perform special tasks. Background technique [0002] The vehicle-mounted millimeter wave radar emits millimeter waves through the antenna, receives the reflected signal of the target, and quickly and accurately obtains the physical environment information around the car body (such as the relative distance between the car and other objects, relative speed, angle, movement, etc.) direction, etc.), an...
Claims
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