Electromagnetic protection folded array antenna

Abstract

The present application belongs to the field of antenna technology, and relates to an electromagnetic protection folded array antenna, comprising: a plurality of array-distributed energy selection antenna units to form an energy selection array; the energy selection antenna unit comprises: a selector and a reflector arranged below the selector; the selector comprises: a first patch layer, a first dielectric layer, a second patch layer, a second dielectric layer and a third patch layer stacked in sequence from top to bottom; the first patch layer comprises: a plurality of selection patches and a diode arranged between two adjacent selection patches to achieve energy selection; the second patch layer comprises: an arrow-shaped structure; the third patch layer has the same structure as the first patch layer, and the direction is orthogonal; the first dielectric layer and the second dielectric layer are exactly the same. The present application can achieve strong electromagnetic protection of high-gain array antennas.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to an electromagnetic protection folded array antenna. Background Art

[0002] High-gain antennas are widely used in remote communication systems such as radar, satellite, and mobile communications. Among them, folded array antennas have received extensive research and attention in recent years due to their combined advantages of high gain and low profile. In high-intensity radiated fields (HIRF), folded array antennas require stronger high-power electromagnetic protection performance due to their high gain and large size.

[0003] In the face of high-intensity radiation fields (HIRF), existing technologies have proposed electromagnetic protection technologies such as limiters, new material technologies, frequency selective surfaces (Frequency Selective Surfaces) and energy selective surfaces (ESS) to protect electronic devices. For example, ESS uses semiconductor devices to design a metasurface with energy low-pass characteristics, which has adaptive electromagnetic environment characteristics, taking into account the protection requirements under HIRF and the effective reception and transmission functions of normal signals.

[0004] However, existing electromagnetic protection research mainly focuses on small-size, omnidirectional, low-gain antennas such as microstrip antennas and dipole antennas. When applied to high-gain antennas such as transmitting array antennas, the protection performance is insufficient, the cost is high, and there are limitations, making it difficult to achieve electromagnetic protection for high-gain antennas. In addition, existing electromagnetic protection methods often start from the radiation unit and change its radiation characteristics, which is difficult to apply to other types of antennas such as reflector antennas and array antennas. Summary of the invention

[0005] Based on this, it is necessary to provide an electromagnetic protection folded array antenna to address the above technical problems, which can achieve strong electromagnetic protection of high-gain array antennas.

[0006] An electromagnetic protection folded array antenna, comprising: a transmission array and a reflection array, so as to form a folded array to achieve electromagnetic protection of the antenna;

[0007] The transmission array includes a plurality of transmission units distributed in an array, and the transmission unit includes: a first patch layer, a first dielectric layer, a second patch layer, a second dielectric layer and a third patch layer stacked in sequence from top to bottom;

[0008] The first patch layer includes: a plurality of selection patches and a diode arranged between two adjacent selection patches to achieve energy selection; the second patch layer includes: a bidirectional arrow-shaped structure; the third patch layer has the same structure as the first patch layer and is orthogonal in direction; the first dielectric layer and the second dielectric layer are completely the same;

[0009] The reflective array is arranged below the transmissive array at intervals, and the reflective array includes a plurality of reflective units distributed in an array.

[0010] In one embodiment, the first patch layer includes: a first selection patch and two second selection patches;

[0011] The first selection patch and the second selection patch are both rectangular structures, and each rectangular structure has two sides that are collinear with a set of opposite sides of the first dielectric layer;

[0012] The center of the first selection patch coincides with the center of the first dielectric layer, and two second selection patches are symmetrically spaced apart on both sides of the first selection patch.

[0013] In one embodiment, the width of the first selection patch is smaller than the width of the second selection patch.

[0014] In one embodiment, the second patch layer includes: a first compensation patch and four second compensation patches; the first compensation patch and the second compensation patch are both rectangular structures;

[0015] One corresponding end of the two second compensation patches is connected to one end of the first compensation patch, and the other corresponding end extends toward the center of the first compensation patch;

[0016] Four second compensation patches are symmetrically arranged at two ends of the first compensation patch.

[0017] In one embodiment, the center of the first compensation patch coincides with the center of the second dielectric layer, and the symmetry axis of the first compensation patch along the length direction is collinear with a diagonal line of the second dielectric layer.

[0018] In one embodiment, four second compensation patches are respectively arranged in parallel with four sides of the second dielectric layer at intervals.

[0019] In one embodiment, the reflection unit includes: a reflection layer, a substrate layer and a floor layer stacked in sequence from top to bottom;

[0020] The reflective layer includes: a rectangular first reflective patch, the center of the first reflective patch coincides with the center of the substrate layer, and the symmetry axis of the first reflective patch along the length direction is collinear with a diagonal line of the substrate layer.

[0021] In one embodiment, the length direction of the first reflection patch is perpendicular to the length direction of the first compensation patch.

[0022] In one embodiment, the reflective layer further comprises: two semicircular second reflective patches;

[0023] The two second reflection patches are symmetrically arranged at two ends of the first reflection patch, the diameter of the second reflection patch is equal to the width of the first reflection patch, and the straight side of the second reflection patch coincides with the short side of the first reflection patch.

[0024] In one embodiment, it further includes: a feed source;

[0025] The feed source is spaced apart from the folding array.

[0026] The above-mentioned electromagnetic protection folded array antenna is an energy-selective folded array antenna with field-controlled gain reconstruction. The folded array includes a transmission array and a reflection array, wherein the transmission array is a field-induced transmission polarization selection structure, which can adaptively adjust the radiation gain. When the energy of the incident electromagnetic wave is low, the antenna has a high gain characteristic, and in a high-intensity radiation field (HIRF), the diode switches from the cut-off state to the on state, and the gain of the antenna is significantly reduced to the level of the feeding gain, which can achieve an antenna main lobe gain change of more than 13dB. At the same time, it can adaptively switch the working state between strong electromagnetic fields and weak electromagnetic fields, thereby realizing the adaptive control of the array antenna for strong electromagnetic protection (i.e. HIRF protection). Taking the working center frequency of 9.3GH as an example, when weak field irradiation is applied, the semiconductor device (i.e., the diode) is cut off, the transmission array reflects the x-polarized electromagnetic wave and transmits the y-polarized electromagnetic wave, and the folded array antenna works normally. Phase compensation is used to make the antenna have high gain characteristics. When strong field irradiation is applied, the semiconductor device is turned on, the transmission array reflects the x-polarized electromagnetic wave and the y-polarized electromagnetic wave at the same time, and the folded array antenna enters a protection state. Most of the incident electromagnetic waves are reflected by the transmission array, and the efficiency of passing through the transmission array will be significantly reduced. The electromagnetic waves passing through will also lose the gain enhanced by the phase compensation, resulting in a reduction in antenna gain, thereby achieving antenna protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a first patch layer of a transmission unit in an electromagnetic protection folded array antenna in an embodiment;

[0028] Figure 2 A schematic diagram of a second patch layer of a transmission unit in an electromagnetic protection folded array antenna in an embodiment;

[0029] Figure 3A schematic diagram of a third patch layer of a transmission unit in an electromagnetic protection folded array antenna in an embodiment;

[0030] Figure 4 A schematic diagram of a reflective layer of a reflective unit in an electromagnetic protection folded array antenna in an embodiment;

[0031] Figure 5 It is a schematic diagram of an electromagnetic protection folded array antenna in a working state and a protection state in one embodiment;

[0032] Figure 6 is a dimension diagram of a first patch layer of an electromagnetic protection folded array antenna in a specific embodiment;

[0033] Figure 7 is a dimension diagram of a second patch layer of an electromagnetic protection folded array antenna in a specific embodiment;

[0034] Figure 8 is a dimension diagram of a third patch layer of an electromagnetic protection folded array antenna in a specific embodiment;

[0035] Fig. 9 A dimension diagram of a reflective layer of an electromagnetic protection folded array antenna in a specific embodiment;

[0036] Fig.10 is a simulation relationship diagram of the length a of the second compensation patch and the transmission phase in one embodiment;

[0037] Fig.11 is a graph showing the amplitude and phase of a diode in an off state at different a values ​​in one embodiment;

[0038] Fig.12 is a transmission coefficient curve of a y-polarized electromagnetic wave of a diode in an off state and an on state in an embodiment;

[0039] Fig.13 is a graph showing the amplitude and phase of a transverse electric wave (TE) of a transmission unit at different incident angles in one embodiment;

[0040] Fig.14 is a graph showing the amplitude and phase of a transverse electric wave (TE) of a reflection unit at different incident angles in one embodiment;

[0041] Fig.15 is a graph showing the amplitude and phase of a transverse magnetic wave (TM) of a transmission unit at different incident angles in one embodiment;

[0042] Fig.16 is a graph showing the amplitude and phase of a transverse magnetic wave (TM) of a reflection unit at different incident angles in one embodiment;

[0043] Fig.17 is a phase compensation diagram of a folded array antenna at 9.3 GHz in one embodiment;

[0044] Fig.18 is a distribution diagram of the error between the achieved x-phase and the target x-phase in one embodiment;

[0045] Fig.19 1 is an E-plane radiation pattern diagram of the antenna in a working state and a protection state in an embodiment;

[0046] Fig. 20 1 is an H-plane radiation pattern diagram of the antenna in a working state and a protection state in an embodiment;

[0047] Fig.21 The figure is a curve diagram of simulation results of the gain of the antenna in the working state and the protection state changing with the frequency in one embodiment.

[0048] Reference numerals:

[0049] Transmission array 1, first patch layer 11, first selection patch 111, second selection patch 112, diode 113, first dielectric layer 12, second patch layer 13, first compensation patch 131, second compensation patch 132, second dielectric layer 14, third patch layer 15;

[0050] Reflection array 2, reflection layer 21, first reflection patch 211, second reflection patch 212, substrate layer 22, floor layer 23;

[0051] Feed 3. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0053] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0054] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "multiple groups" means at least two groups, such as two groups, three groups, etc., unless otherwise clearly and specifically defined.

[0055] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0057] The present application provides an electromagnetic protection folded array antenna, such as Figures 1 to 4 As shown, in one embodiment, it includes: a transmission array, a reflection array and a feed source; the transmission array includes a plurality of transmission units distributed in an array, the reflection array includes a plurality of reflection units distributed in an array, the transmission array is arranged above the reflection array at intervals, and the transmission array and the reflection array together form a folded array. It should be noted that the periods of the selection unit and the reflection unit can be different, and the number of the selection unit and the reflection unit can also be unequal. It should also be noted that how the transmission array and the reflection array are specifically arranged at intervals belongs to the prior art and will not be repeated here, for example: a non-metallic support column is arranged between the transmission array and the reflection array.

[0058] The transmission unit is used for polarization selection and polarization deflection, and includes: a first patch layer, a first dielectric layer, a second patch layer, a second dielectric layer and a third patch layer, which are stacked in sequence from top to bottom.

[0059] The first patch layer is an x-polarization selection layer, which is used for x-polarization selection, and includes: a plurality of selection patches and a diode arranged between two adjacent selection patches to achieve energy selection; specifically, the first patch layer includes: a first selection patch, two second selection patches and four diodes; the first selection patch and the second selection patch are both rectangular structures, and each rectangular structure has two sides that are collinear with a set of opposite sides of the first dielectric layer; the center of the first selection patch coincides with the center of the first dielectric layer, and the two second selection patches are symmetrically spaced on both sides of the first selection patch; two diodes are arranged between the first selection patch and each second selection patch, and the two diodes are spaced and arranged in the same direction. It should be noted that the diode can be selected as the SMP1340-040LF model.

[0060] The first dielectric layer is made of F4B material with a relative dielectric constant of 2.65 and a loss tangent of 0.0025.

[0061] The second patch layer includes: a bidirectional arrow-shaped structure to achieve deflection of linear polarization waves (converted into linear polarization waves in orthogonal directions) and phase compensation; specifically: the second patch layer includes: a first compensation patch and four second compensation patches; the first compensation patch and the second compensation patch are both rectangular structures; one corresponding end of the two second compensation patches is connected to one end of the first compensation patch, and the other corresponding end extends to the center of the first compensation patch; the four second compensation patches are symmetrically arranged at both ends of the first compensation patch. Preferably, the four second compensation patches are arranged perpendicular to the first compensation patch to improve the gain of the antenna, while achieving better signal transmission effect and a larger phase adjustable range.

[0062] The second dielectric layer is completely identical to the first dielectric layer.

[0063] The third patch layer is a y-polarization selection layer, which is used for y-polarization selection. It has exactly the same structure as the first patch layer and is orthogonal in direction to reduce transmission loss and ensure better signal transmission effect.

[0064] The reflection unit is used for polarization twisting and can twist the incident electromagnetic wave by 90 degrees to transform it into a polarized wave orthogonal to it. It includes: a reflection layer, a substrate layer and a floor layer. The reflection layer, the substrate layer and the floor layer are stacked in sequence from top to bottom.

[0065] The reflective layer includes: a first reflective patch and two second reflective patches; the first reflective patch is a rectangular structure, the center of the first reflective patch coincides with the center of the substrate layer, and the symmetry axis of the first reflective patch along the length direction is collinear with a diagonal line of the substrate layer; the second reflective patch is a semicircular structure, the two second reflective patches are symmetrically arranged at both ends of the first reflective patch, the diameter of the second reflective patch is equal to the width of the first reflective patch, and the straight side of the second reflective patch coincides with the short side of the first reflective patch. Preferably, the width of the first reflective patch is one quarter of the reflector period to ensure the reflection coefficient and bandwidth.

[0066] The substrate layer is made of F4B material with a relative dielectric constant of 2.65 and a loss tangent of 0.0025.

[0067] The floor layer is fully covered floor.

[0068] The feed source is arranged on the reflective array, preferably at the midpoint of the reflective array to improve efficiency. The present application does not require external feed control, and the antenna itself can realize self-sensing and self-processing of the electric field, and has an adaptive protection effect.

[0069] Preferably, the width of the first selected patch is smaller than the width of the second selected patch to ensure good frequency response characteristics and improve transmission effectiveness.

[0070] Further preferably, the center of the first compensation patch coincides with the center of the second dielectric layer, and the symmetry axis of the first compensation patch along the length direction is collinear with a diagonal line of the second dielectric layer to ensure angle stability.

[0071] More preferably, the four second compensation patches are respectively arranged in parallel with the four sides of the second dielectric layer to avoid coupling and mutual influence, thereby ensuring a better transmission effect.

[0072] More preferably, the length direction of the first reflective patch is perpendicular to the length direction of the first compensation patch to ensure better transmission and reflection effects.

[0073] It should be noted that the first dielectric layer, the second dielectric layer, the substrate layer and the floor layer are all square structures.

[0074] It should also be noted that the first patch layer, the second patch layer, the third patch layer, the reflective layer and the floor layer are all made of metal materials, and the first dielectric layer, the second dielectric layer and the substrate layer are all made of non-metallic materials.

[0075] like Figure 5As shown, the schematic diagram of the antenna in the working state and the protection state: the far-field incident electromagnetic wave first irradiates the transmission array, and the transmission array reflects the y polarization (ray 50) back (ray 60) and allows the x polarization (ray 10) to be transmitted. The emitted (more specifically, transmitted) electromagnetic wave is converted into a y polarized electromagnetic wave (ray 20) through polarization deflection and phase compensation. Phase compensation can adjust the phase of the electromagnetic wave and improve the antenna gain. The y polarized electromagnetic wave (ray 20) is reflected onto the reflective array, and the reflective array reverses the polarization direction of the electromagnetic wave, so that the electromagnetic wave is reflected and converted into an x ​​polarized wave (ray 30), and then irradiates the transmission array and is received by the feed reflection (ray 40).

[0076] When the energy of the incident electromagnetic wave is high, the induced voltage can trigger the diode, the diode is in the on state, and the antenna enters the protection state. Most of the incident electromagnetic waves (ray 70) are reflected back by the transmission array (ray 80), and the efficiency of passing through the transmission array will be significantly reduced. The electromagnetic waves passing through will also lose the gain enhanced by the phase compensation, resulting in a reduction in the antenna gain, thereby achieving antenna protection.

[0077] When the energy of the incident electromagnetic wave is low, the induced voltage cannot trigger the diode, the diode is in the cut-off state, and the signal is received; when the energy of the electromagnetic wave gradually increases, making the diode partially or fully turned on, its impedance characteristics change, and high-power electromagnetic waves cannot enter the circuit. By switching the working mode of the semiconductor device, that is, the diode, the field-controlled adaptive protection of the antenna is achieved.

[0078] The above-mentioned electromagnetic protection folded array antenna is an energy-selective folded array antenna with field-controlled gain reconstruction. The folded array includes a transmission array and a reflection array, wherein the transmission array is a field-induced transmission polarization selection structure, which can adaptively adjust the radiation gain. When the energy of the incident electromagnetic wave is low, the antenna has a high gain characteristic, and in a high-intensity radiation field (HIRF), the diode switches from the cut-off state to the on state, and the gain of the antenna is significantly reduced to the level of the feeding gain, which can achieve an antenna main lobe gain change of more than 13dB. At the same time, it can adaptively switch the working state between strong electromagnetic fields and weak electromagnetic fields, thereby realizing the adaptive control of the array antenna for strong electromagnetic protection (i.e. HIRF protection). Taking the working center frequency of 9.3GH as an example, when weak field irradiation is applied, the semiconductor device (i.e., the diode) is cut off, the transmission array reflects the x-polarized electromagnetic wave and transmits the y-polarized electromagnetic wave, and the folded array antenna works normally. Phase compensation is used to make the antenna have high gain characteristics. When strong field irradiation is applied, the semiconductor device is turned on, the transmission array reflects the x-polarized electromagnetic wave and the y-polarized electromagnetic wave at the same time, and the folded array antenna enters a protection state. Most of the incident electromagnetic waves are reflected by the transmission array, and the efficiency of passing through the transmission array will be significantly reduced. The electromagnetic waves passing through will also lose the gain enhanced by the phase compensation, resulting in a reduction in antenna gain, thereby achieving antenna protection.

[0079] In a specific embodiment, the transmission array is a square array with a side length of 180 mm, and is composed of 900 transmission units arranged in a close relationship. The transmission phase of the transmission unit can be obtained according to the focal length and the position of the transmission unit, and the formula is as follows:

[0080] ;

[0081] in, is the transmission phase required by the transmission unit, is a fixed parameter corresponding to the frequency point, and is the position of each transmission unit relative to the central unit, F is the focal length of the array antenna, specifically 90 mm, F / D is 0.5, D is the aperture of the antenna, and the distance H between the transmission array and the reflection array is 35 mm.

[0082] like Figures 6 to 9 As shown, the antenna size parameters are as follows: p = 6mm, l 1 = 0.4 mm, l 2 = 1.7 mm, g = 0.3mm, d = 0.8 mm, dd = 3mm, b = 6mm, w = 0.4 mm, q = 8mm, k = 7mm, c = 2mm.

[0083] The length a of the second compensation patch ranges from 1 mm to 4 mm, and the length of a at different positions varies according to different transmission phase requirements.

[0084] like Fig.10 As shown in FIG. 1 , the simulated relationship between the length a of the second compensation patch and the transmission phase is shown in FIG. 1 . It can be seen that by adjusting the length a, the amplitude and phase of electromagnetic wave propagation can be controlled.

[0085] like Fig.11As shown in the figure, the amplitude and phase curves of different a in the off state of the diode. It can be seen that when a increases from 1mm to 4mm, the transmission loss remains below 2dB, and the electromagnetic wave attenuation through the transmission array is small; when the length of a is adjusted from 1mm to 4mm, the phase change range is 180°. When the second patch layer is mirrored, an additional 180° transmission phase can be obtained, meeting the requirement of a 360° phase adjustment range of the transmission phase.

[0086] like Fig.12 As shown in FIG. 1 , the transmission coefficient curve of the y-polarized electromagnetic wave of the diode in the cut-off (off) and conduction (on) states. It can be seen that in the 9-10GHz range, the transmission loss of the antenna is less than 2dB in the working state, and the transmission loss is higher than 15dB in the protection state.

[0087] like Figures 13 to 16 As shown in the figure, the reflection loss of the reflective layer is less than 2dB, and the incident wave is reflected in the form of an orthogonal electromagnetic wave. At different oblique incident angles of 0° to 45°, the amplitude is basically stable and the phase error is within 50°.

[0088] like Fig.17 As shown, the phase compensation diagram of the folded array antenna at 9.3 GHz.

[0089] like Fig.18 The error distribution diagram between the achieved x phase and the target x phase is shown in Figure 1. The error between the achieved phase and the target phase is mostly within 5°, with a maximum error of 8°.

[0090] like Fig.19 The E-plane radiation pattern is shown in Figure 1. Fig. 20 The H-plane radiation pattern is shown in Figure 1. It can be seen that the gain of the antenna is 20.7 dBi at 9.3 GHz.

[0091] like Fig.21 As shown in the figure, the simulation result curve of the gain of the antenna in working state and protection state changes with frequency. In the high intensity radiated field (HIRF) experiment, when the field strength reaches 1000V / m, all diodes are triggered and the antenna gain drops to about 7.6dBi. When the field strength continues to increase from 1000V / m to 10000V / m, the antenna gain remains stable.

[0092] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An electromagnetic protection folded array antenna, characterized in that: include: Transmission array and reflection array are used to form a folded array to achieve electromagnetic protection of the antenna; The transmission array includes a plurality of transmission units distributed in an array, and the transmission unit includes: a first patch layer, a first dielectric layer, a second patch layer, a second dielectric layer and a third patch layer stacked in sequence from top to bottom; The first patch layer includes: a plurality of selection patches and a diode arranged between two adjacent selection patches to achieve energy selection; the second patch layer includes: a bidirectional arrow-shaped structure; the third patch layer has the same structure as the first patch layer and is orthogonal in direction; the first dielectric layer and the second dielectric layer are completely the same; The reflective array is arranged below the transmissive array at intervals, and the reflective array includes a plurality of reflective units distributed in an array; The first patch layer includes: a first selection patch and two second selection patches; The first selection patch and the second selection patch are both rectangular structures, and each rectangular structure has two sides that are collinear with a set of opposite sides of the first dielectric layer; The center of the first selection patch coincides with the center of the first dielectric layer, and two second selection patches are symmetrically spaced apart on both sides of the first selection patch.

2. The electromagnetic protection folded array antenna according to claim 1, characterized in that: The width of the first selection patch is smaller than the width of the second selection patch.

3. The electromagnetic protection folded array antenna according to claim 1 or 2, characterized in that: The second patch layer includes: a first compensation patch and four second compensation patches; the first compensation patch and the second compensation patch are both rectangular structures; One corresponding end of the two second compensation patches is connected to one end of the first compensation patch, and the other corresponding end extends toward the center of the first compensation patch; The four second compensation patches are symmetrically arranged at two ends of the first compensation patch.

4. The electromagnetic protection folded array antenna according to claim 3, characterized in that: The center of the first compensation patch coincides with the center of the second dielectric layer, and the symmetry axis of the first compensation patch along the length direction is collinear with a diagonal line of the second dielectric layer.

5. The electromagnetic protection folded array antenna according to claim 4, characterized in that: The four second compensation patches are respectively arranged in parallel with the four sides of the second dielectric layer.

6. The electromagnetic protection folded array antenna according to claim 3, characterized in that: The reflection unit comprises: a reflection layer, a substrate layer and a floor layer stacked in sequence from top to bottom; The reflective layer includes: a rectangular first reflective patch, the center of the first reflective patch coincides with the center of the substrate layer, and the symmetry axis of the first reflective patch along the length direction is collinear with a diagonal line of the substrate layer.

7. The electromagnetic protection folded array antenna according to claim 6, characterized in that: The length direction of the first reflection patch is perpendicular to the length direction of the first compensation patch.

8. The electromagnetic protection folded array antenna according to claim 7, characterized in that: The reflective layer further comprises: two semicircular second reflective patches; The two second reflection patches are symmetrically arranged at two ends of the first reflection patch, the diameter of the second reflection patch is equal to the width of the first reflection patch, and the straight side of the second reflection patch coincides with the short side of the first reflection patch.

9. The electromagnetic protection folded array antenna according to claim 1 or 2, characterized in that: Also includes: Feeds; The feed source is spaced apart from the folding array.

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