Band-stop wave absorber with narrow reflection band and antenna device
By setting a metal layer and gap of a specific structure in the resonant unit of the absorber body, the wave absorption performance is enhanced, and the problem of insufficient absorption capacity of the absorber body is solved, and the absorption and application of multi-band electromagnetic waves are improved.
Patent Information
- Application Number
- CN202421111997.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-21
AI Technical Summary
The existing band-resistive frequency selects the reflection bandwidth of the absorber, resulting in a narrow absorption band, which is unable to effectively absorb multi-band electromagnetic waves, and is poor in application.
Design a resistive wave absorber, and form an equivalent circuit by setting an annular metal patch and a resistor on the dielectric layer of the resonant unit, and setting an X-shaped metal gap patch and annular metal patch on the upper and lower surfaces of the dielectric substrate. , to enhance the absorbing performance, narrow the reflective band and widen the absorbing band.
The absorption of electromagnetic waves in more frequency bands is achieved, the application is improved, the structure is simplified, the cost is reduced, and the integrated function of the antenna is enhanced.
Smart Images
Figure CN222300867U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of microwave technology, in particular to a band-stop type absorber with a narrow reflection band and an antenna device. Background Art
[0002] At present, the response of band-stop frequency selective absorbers to electromagnetic waves can be expressed as absorption-reflection-absorption. They can absorb out-of-band signals and effectively reduce the radar scattering cross-section while ensuring the overall communication performance of the protected equipment, thereby achieving the purpose of stealth.
[0003] However, the current band-stop frequency selective absorber has a wide reflection band, and the absorption band and the reflection band are almost in a 1:1 state, which results in a narrow absorption band. It can only absorb electromagnetic waves of certain frequencies and thus become invisible, but cannot absorb electromagnetic waves of more frequency bands and thus become invisible, resulting in poor applicability. Utility Model Content
[0004] The utility model provides a band-stop absorber and antenna device with a narrow reflection band to improve applicability. The specific technical solution is as follows:
[0005] In a first aspect, the utility model provides a band-stop absorber with a narrow reflection band, comprising one or more resonance units, when a plurality of resonance units are included, the plurality of resonance units form a square array;
[0006] Each resonant unit includes a first dielectric layer and a second dielectric layer arranged vertically from top to bottom, the first dielectric layer and the second dielectric layer are fixed by a first non-metallic column, and a first air layer of a first preset height is formed between the first dielectric layer and the second dielectric layer;
[0007] The first dielectric layer includes a first dielectric substrate, a first lossy layer disposed on an upper surface of the first dielectric substrate, and a first lossless layer disposed on a lower surface of the first dielectric substrate and located above the first air layer;
[0008] The second dielectric layer includes a second dielectric substrate, a second lossless layer disposed on the upper surface of the second dielectric substrate and below the first air layer, and a third lossless layer disposed on the lower surface of the second dielectric substrate;
[0009] The first lossy layer includes a first annular metal patch and a multiple of four resistors, the first annular metal patch is located at the center of the upper surface of the first dielectric substrate, each resistor is electrically connected to the first annular metal patch in a center-symmetrical manner, the ring width of the first annular metal patch is not greater than a first preset width, wherein the symmetry center of each resistor is the center of the upper surface of the first dielectric substrate;
[0010] The first lossless layer includes four X-shaped metal gap patches, the four X-shaped metal gap patches are centrally symmetrically arranged on the lower surface of the first dielectric substrate, and the distance between the first corner point of each X-shaped metal gap patch and the center of the lower surface of the first dielectric substrate is greater than a first preset distance, the first corner point is the corner point of each X-shaped metal gap patch closest to the center of the lower surface of the first dielectric substrate, wherein the symmetry center of the four X-shaped metal gap patches is the center of the lower surface of the first dielectric substrate;
[0011] The second lossless layer includes a second annular metal patch, the second annular metal patch is located at the center of the upper surface of the second dielectric substrate, the ring width of the second annular metal patch is greater than the second preset width and the area of the second annular metal patch occupies at least three quarters of the upper surface of the second dielectric substrate;
[0012] The third lossless layer is a metal patch having the same size as the lower surface of the second dielectric substrate.
[0013] Optionally, the number of the resistor sheets is four, the first annular metal patch is a square ring metal patch, and the center positions of the four sides of the first annular metal patch are electrically connected to the four resistor sheets respectively.
[0014] Optionally, the X-shaped metal gap patch includes a patch base and a first gap and a second gap which are arranged on the patch base and cross each other and are perpendicularly arranged, and the width of the first gap is twice the width of the second gap.
[0015] Optionally, the patch substrate is in a square shape.
[0016] Optionally, the first gap is a gap with a closed edge at one end and an unclosed edge at the other end.
[0017] Optionally, the second gap is a gap with closed edges at both ends.
[0018] Optionally, the thickness of the second dielectric substrate is greater than the thickness of the first dielectric substrate.
[0019] Optionally, the first dielectric substrate and the second dielectric substrate are both square in shape.
[0020] Optionally, the first dielectric substrate and the second dielectric substrate are both made of plates having a dielectric constant less than a preset threshold.
[0021] In a second aspect, the utility model provides an antenna device, comprising an antenna and a band-stop absorber with a narrow reflection band as described in any one of the first aspects above, wherein the antenna is installed above the center of the band-stop absorber, and the antenna and the band-stop absorber are fixed by a second non-metallic column, forming a second air layer of a second preset height between the antenna and the band-stop absorber.
[0022] It can be seen from the above content that the band-stop absorber with a narrow reflection band provided by the embodiment of the utility model includes one or more resonance units. When multiple resonance units are included, the multiple resonance units form a square array. Each resonance unit includes a first dielectric layer and a second dielectric layer arranged vertically from top to bottom. The first dielectric layer and the second dielectric layer are fixed by a first non-metallic column, and a first air layer of a first preset height is formed between the first dielectric layer and the second dielectric layer. The first dielectric layer includes a first dielectric substrate, a first lossy layer arranged on the upper surface of the first dielectric substrate, and a first lossless layer arranged on the lower surface of the first dielectric substrate and located above the first air layer; the second dielectric layer includes a second dielectric substrate, a second lossless layer arranged on the upper surface of the second dielectric substrate and located below the first air layer, and a third lossless layer arranged on the lower surface of the second dielectric substrate; the first lossy layer includes a first annular metal patch and a multiple of four resistors, the first annular metal patch is located at the center of the upper surface of the first dielectric substrate, and each resistor is electrically connected to the first annular metal patch symmetrically, and the ring width of the first annular metal patch is less than the first preset width, wherein the symmetry center of each resistor is the first dielectric substrate. The first lossless layer comprises four X-shaped metal gap patches, which are centrally symmetrically arranged on the lower surface of the first dielectric substrate, and the distance between the center of each X-shaped metal gap patch and the center of the lower surface of the first dielectric substrate is greater than the first preset distance, wherein the symmetry center of the four X-shaped metal gap patches is the center of the lower surface of the first dielectric substrate; the second lossless layer comprises a second annular metal patch, which is located at the center of the upper surface of the second dielectric substrate, the ring width of the second annular metal patch is greater than the second preset width and the area of the second annular metal patch occupies at least three quarters of the upper surface of the second dielectric substrate, and the third lossless layer is a metal patch of the same size as the lower surface of the second dielectric substrate. Thus, for each resonant unit, by arranging a first lossy layer in the form of a first annular metal patch electrically connected to a multiple of four resistor sheets on the upper surface of the first dielectric substrate, arranging a first lossless layer in the form of four X-shaped metal gap patches on the lower surface of the first dielectric substrate, arranging a second lossless layer in the form of a second annular metal patch occupying at least three quarters of the upper surface of the second dielectric substrate, and arranging a third lossless layer in the form of a metal patch equal to the lower surface of the second dielectric substrate on the upper and lower surfaces of the second dielectric substrate, respectively, the wave absorbing performance can be enhanced, thereby narrowing the reflection band and widening the wave absorbing band. Therefore, the band-stop type absorber with a narrow reflection band provided in the embodiment of the utility model can absorb electromagnetic waves in more frequency bands to be invisible, thereby improving applicability.
[0023] The innovative features of the present utility model embodiment include:
[0024] 1. For each resonant unit, by arranging a first lossy layer in the form of a first annular metal patch electrically connected to a multiple of four resistor sheets on the upper surface of the first dielectric substrate, arranging a first lossless layer in the form of four X-shaped metal gap patches on the lower surface of the first dielectric substrate, arranging a second lossless layer in the form of a second annular metal patch at least occupying three quarters of the upper surface of the second dielectric substrate on the upper and lower surfaces of the second dielectric substrate, and a third lossless layer in the form of a metal patch equal to the lower surface of the second dielectric substrate on the upper and lower surfaces of the second dielectric substrate, the absorbing performance can be enhanced, thereby narrowing the reflection band and widening the absorbing band. Therefore, the band-stop absorber with a narrow reflection band provided in the embodiment of the utility model can absorb electromagnetic waves of more frequency bands to be invisible, thereby improving applicability.
[0025] 2. The band-stop absorber with a narrow reflection band provided by the embodiment of the utility model is composed of only one or more resonance units, and each resonance unit is composed of only a first dielectric layer and a second dielectric layer. It has a simple structure, a smaller volume, a lighter and thinner overall structure, and reduces costs.
[0026] 3. For each resonance unit, a first lossy layer is arranged on the upper surface of the first dielectric substrate, a first lossless layer is arranged on the lower surface of the first dielectric substrate, and a second lossless layer and a third lossless layer are arranged on the upper and lower surfaces of the second dielectric substrate respectively. Then, the equivalent circuit of the resonance unit is obtained by assuming that the metal trace is equivalent to an inductor and the gap is equivalent to a capacitor. Since the frequency selective surface of the capacitor and the inductor in series can exhibit the characteristics of complete reflection, and the frequency selective surface of the capacitor and the inductor in parallel can exhibit the characteristics of complete transmission, and the equivalent circuit of the resonance unit includes both the capacitor and the inductor in series and the capacitor and the inductor in parallel, the equivalent circuit of the resonance unit can exhibit total reflection or total transmission of electromagnetic waves in different frequency bands, thereby realizing the effect of wave absorption-reflection-wave absorption.
[0027] 4. The antenna device provided by the embodiment of the utility model includes an antenna and a band-stop absorber with a narrow reflection band. Each resonant unit in the band-stop absorber can enhance the absorbing performance by arranging a first lossy layer in the form of a first annular metal patch electrically connected to a multiple of four resistors on the upper surface of the first dielectric substrate, arranging a first lossless layer in the form of four X-shaped metal gap patches on the lower surface of the first dielectric substrate, and arranging a second lossless layer in the form of a second annular metal patch at least occupying three quarters of the upper surface of the second dielectric substrate on the upper and lower surfaces of the second dielectric substrate, and a third lossless layer in the form of a metal patch equal to the lower surface of the second dielectric substrate. Therefore, the reflection band becomes narrower and the absorbing band becomes wider. Therefore, the antenna can absorb electromagnetic waves of more frequency bands to be invisible and improve applicability. At the same time, the integrated function of radiation scattering is realized. And the antenna gain is improved.
[0028] Of course, implementing any product or method of the present invention does not necessarily require achieving all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work.
[0030] Figure 1 A schematic structural diagram of an angle of a band-stop absorber with a narrow reflection band provided by an embodiment of the utility model;
[0031] Figure 2 A schematic structural diagram of another angle of a band-stop absorber with a narrow reflection band provided by an embodiment of the utility model;
[0032] Figure 3 A schematic diagram of the structure of the first lossy layer provided in an embodiment of the utility model;
[0033] Figure 4 A schematic diagram of the structure of the first lossless layer provided in an embodiment of the utility model;
[0034] Figure 5 A schematic diagram of the structure of the second lossless layer provided in an embodiment of the utility model;
[0035] Figure 6 A schematic diagram of the structure of the third lossless layer provided in an embodiment of the utility model;
[0036] Figure 7 A schematic diagram of the reflection coefficient of a band-stop absorber with a narrow reflection band provided in an embodiment of the utility model;
[0037] Figure 8 A schematic diagram of the absorptivity of a band-stop absorber with a narrow reflection band provided in an embodiment of the present utility model.
[0038] Figure 1-Figure 6 In the figure, 1 is the first dielectric layer, 11 is the first dielectric substrate, 12 is the first lossy layer, 121 is the first annular metal patch, 122 is the resistor, 13 is the first lossless layer, 131 is the X-type metal gap patch, 131 is the patch substrate, 131 is the first gap, 131 is the second gap, 2 is the second dielectric layer, 21 is the second dielectric substrate, 22 is the second lossless layer, 221 is the second annular metal patch, 23 is the third lossless layer, 3 is the first air layer, t air The first preset height, t bottom The thickness of the second dielectric substrate, ttop The thickness of the first dielectric substrate, t copper The thickness of the metal layer, a1 the ring width of the first annular metal patch, a2 the distance between the outer edge of the first annular metal patch and the outer edge of the upper surface of the first dielectric substrate, a0 the length of the resistor, P0 the side length of the patch base 1311, w0 the width of the first gap, w1 the width of the second gap, b0 the length of the second gap, b1 the length of the first gap, c2 the side length of the inner circumference of the second annular metal patch, c1 the side length of the outer circumference of the second annular metal patch, P the side length of the square metal patch. DETAILED DESCRIPTION
[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0040] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present utility model and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.
[0041] The embodiment of the utility model discloses a band-stop absorber and an antenna device with a narrow reflection band, which can improve the applicability. The embodiment of the utility model is described in detail below.
[0042] Figure 1 A schematic structural diagram of an angle of a band-stop absorber with a narrow reflection band provided in an embodiment of the utility model. Figure 2 A schematic structural diagram of another angle of a band-stop absorber with a narrow reflection band provided in an embodiment of the utility model. Figure 3 A schematic diagram of the structure of the first lossy layer provided in an embodiment of the utility model, Figure 4 A schematic diagram of the structure of the first lossless layer provided in an embodiment of the utility model, Figure 5 A schematic diagram of the structure of the second lossless layer provided in an embodiment of the utility model, Figure 6 A schematic structural diagram of the third lossless layer provided in an embodiment of the utility model.
[0043] See also Figure 1-Figure 6The band-stop absorber with a narrow reflection band provided by an embodiment of the utility model includes one or more resonance units. When multiple resonance units are included, the multiple resonance units form a square array, such as a 3×3 square array or a 6×6 square array, wherein the resonance unit is an electronic component that generates a resonance frequency.
[0044] See also Figure 1 Each resonant unit includes a first dielectric layer 1 and a second dielectric layer 2 arranged vertically from top to bottom, the first dielectric layer 1 and the second dielectric layer 2 are fixed by a first non-metallic column, and a first air layer 3 of a first preset height is formed between the first dielectric layer 1 and the second dielectric layer 2. When in use, the normal incident direction of the electromagnetic wave is from top to bottom. For example, Figure 2 As shown in FIG. , the first preset height t air It can be 7mm.
[0045] Exemplarily, the overall structural height of each resonance unit may be 9.25 mm, where the overall structural height is the distance from the upper surface of the first dielectric layer 1 to the lower surface of the second dielectric layer 2 , and the first non-metallic column may be a plastic column.
[0046] Among them, the way in which the first dielectric layer 1 and the second dielectric layer 2 are fixed by the first non-metallic column can be: four first non-metallic columns are respectively fixedly connected between the four corner points of the first dielectric layer 1 and the second dielectric layer 2. The fixed connection method can be any fixed connection method in the prior art, and the embodiment of the utility model does not impose any limitation on this.
[0047] See also Figure 2 The first dielectric layer 1 includes a first dielectric substrate 11, a first lossy layer 12 disposed on the upper surface of the first dielectric substrate 11, and a first lossless layer 13 disposed on the lower surface of the first dielectric substrate 11 and located above the first air layer 3. The lossy layer refers to a layer that generates loss when electromagnetic waves pass through, and the lossless layer refers to a layer that does not generate loss when electromagnetic waves pass through.
[0048] The second dielectric layer 2 includes a second dielectric substrate 21 , a second lossless layer 22 disposed on the upper surface of the second dielectric substrate 21 and below the first air layer 3 , and a third lossless layer 23 disposed on the lower surface of the second dielectric substrate 21 .
[0049] The thickness of the second dielectric substrate 21 is greater than the thickness of the first dielectric substrate 11 .
[0050] For example, Figure 2 As shown, the thickness of the second dielectric substrate is t bottom is 1.6 mm, and the thickness of the first dielectric substrate is t top It is 0.51mm.
[0051] Exemplarily, the first dielectric substrate 11 and the second dielectric substrate 21 are both square in shape.
[0052] The first dielectric substrate 11 and the second dielectric substrate 21 are both made of plates with a dielectric constant less than a preset threshold. For example, the preset threshold may be 4.4, and the first dielectric substrate 11 and the second dielectric substrate 21 are both made of Rogers 5880 material with a dielectric constant of 2.2.
[0053] Continue to see Figure 3 The first lossy layer 12 includes a first annular metal patch 121 and a multiple of four resistors 122, the first annular metal patch 121 is located at the center of the upper surface of the first dielectric substrate 11, each resistor 122 is electrically connected to the first annular metal patch 121 in a center-symmetrical manner, and the ring width of the first annular metal patch 121 is not greater than a first preset width, wherein the symmetry center of each resistor 122 is the center of the upper surface of the first dielectric substrate 11, and the first preset width can be 1 mm, for example: Figure 3 The ring width a1 of the first annular metal patch 121 is 0.48 mm. The distance a2 between the outer edge of the first annular metal patch 121 and the outer edge of the upper surface of the first dielectric substrate 11 is 1 mm.
[0054] Specifically, the number of the resistor sheets 122 may be four, the first annular metal patch 121 is a square ring metal patch, and the centers of the four sides of the first annular metal patch 121 are electrically connected to the four resistor sheets 122. The width of the resistor sheet 122 may be equal to the ring width of the first annular metal patch 121. For example, Figure 3 As shown, the width of the resistor sheet 122 is 0.48 mm, the length a0 of the resistor sheet 122 is 0.7 mm, and the resistance value of the resistor sheet 122 is 350 ohm.
[0055] See also Figure 4 The first lossless layer 13 includes four X-shaped metal gap patches 131, which are centrally symmetrically arranged on the lower surface of the first dielectric substrate 11, and the distance between the first corner point of each X-shaped metal gap patch 131 and the center of the lower surface of the first dielectric substrate 11 is greater than the first preset distance, wherein the first corner point is the corner point of each X-shaped metal gap patch 131 closest to the center of the lower surface of the first dielectric substrate 11, and the symmetry center of the four X-shaped metal gap patches 131 is the center of the lower surface of the first dielectric substrate 11. Exemplarily, the first preset distance may be 0.5 mm.
[0056] Continue to see Figure 4The X-shaped metal gap patch 131 includes a patch substrate 1311 and a first gap 1312 and a second gap 1313 disposed on the patch substrate 1311 and intersecting and vertically disposed with each other. The width of the first gap 1312 is twice the width of the second gap 1313. Exemplarily, the shape of the patch substrate 1311 can be circular or square, such as Figure 4 As shown, the shape of the patch substrate 1311 is a square, and the side length P0 of the patch substrate 1311 is 4 mm.
[0057] The first gap 1312 is a gap with a closed edge at one end and an unclosed edge at the other end. The second gap 1313 is a gap with closed edges at both ends. Figure 4 As shown, the width w0 of the first gap is 0.4 mm, the width w1 of the second gap is 0.2 mm, the length b0 of the second gap is 3.53 mm, and the length b1 of the first gap is 4.22 mm.
[0058] See also Figure 5 The second lossless layer 22 includes a second annular metal patch 221, which is located at the center of the upper surface of the second dielectric substrate 21. The ring width of the second annular metal patch 221 is greater than the second preset width and the area of the second annular metal patch 221 occupies at least three quarters of the upper surface of the second dielectric substrate 21. In other words, the second annular metal patch 221 is larger, while the first annular metal patch 121 is smaller.
[0059] Exemplarily, the second annular metal patch 221 is a square ring metal patch, such as Figure 5 As shown, the side length c2 of the inner circumference of the second annular metal patch 221 is 2.1 mm, and the side length c1 of the outer circumference of the second annular metal patch 221 is 9.5 mm.
[0060] See also Figure 6 The third lossless layer 23 is a metal patch having the same size as the lower surface of the second dielectric substrate 21. Exemplarily, the third lossless layer 23 is a square metal patch, such as Figure 6 As shown, the side length P of the square metal patch is 13 mm.
[0061] It can be seen that the first lossy layer 12, the first non-lossy layer 13, the second non-lossy layer 22 and the third non-lossy layer 23 are all metal layers. Figure 2 As shown, the thickness of the metal layer t copper It is 0.035mm.
[0062] In the embodiment of the utility model, for each resonant unit, the metal trace can be equivalent to an inductor, and the gap can be equivalent to a capacitor, so the first lossy layer 12 can be equivalent to an equivalent circuit in which a capacitor, an inductor and a resistor are connected in series according to the method of an equivalent circuit. The first lossless layer 13 can be equivalent to an equivalent circuit in which a capacitor and an inductor are connected in parallel according to the method of an equivalent circuit. The second lossless layer 22 can be equivalent to an equivalent circuit in which a capacitor and an inductor are connected in series according to the method of an equivalent circuit. The third lossless layer 23 can be equivalent to an equivalent circuit including an inductor according to the method of an equivalent circuit.
[0063] Since the frequency selective surface of capacitors and inductors in series can exhibit the characteristics of complete reflection, while the frequency selective surface of capacitors and inductors in parallel can exhibit the characteristics of complete transmission, the equivalent circuit of the resonant unit composed of the above-mentioned equivalent circuits can exhibit total reflection or total transmission of electromagnetic waves in different frequency bands, thus realizing the effect of absorption-reflection-absorption.
[0064] Therefore, for each resonance unit, by arranging a first lossy layer 12 on the upper surface of the first dielectric substrate 11 and a first lossless layer 13 on the lower surface of the first dielectric substrate 11, and arranging a second lossless layer 22 and a third lossless layer 23 on the upper and lower surfaces of the second dielectric substrate 21, respectively, and then obtaining an equivalent circuit of the resonance unit according to the metal routing being equivalent to an inductor and the gap being equivalent to a capacitor, and because a frequency selective surface in which a capacitor and an inductor are connected in series can exhibit a characteristic of total reflection, and a frequency selective surface in which a capacitor and an inductor are connected in parallel can exhibit a characteristic of total transmission, and the equivalent circuit of the resonance unit includes both a capacitor and an inductor connected in series and a capacitor and an inductor connected in parallel, the equivalent circuit of the resonance unit can exhibit total reflection or total transmission of electromagnetic waves in different frequency bands, thereby realizing the effect of wave absorption-reflection-wave absorption.
[0065] Figure 7 A schematic diagram of the reflection coefficient of a band-stop absorber with a narrow reflection band provided in an embodiment of the utility model, Figure 8 A schematic diagram of the absorptivity of a band-stop absorber with a narrow reflection band provided in an embodiment of the present utility model. Figure 7 In the equation, the horizontal axis is the frequency and the vertical axis is the reflection coefficient. Figure 8 In the figure, the horizontal axis is frequency and the vertical axis is absorption rate.
[0066] See also Figure 7For each resonant unit, a first lossy layer 12 in the form of a first annular metal patch 121 electrically connected to a multiple of four resistors 122 is provided on the upper surface of the first dielectric substrate 11, a first lossless layer 13 in the form of four X-shaped metal gap patches is provided on the lower surface of the first dielectric substrate 11, and a second lossless layer 22 in the form of a second annular metal patch 221 occupying at least three quarters of the upper surface of the second dielectric substrate 21 and a second lossless layer 22 in the form of a second annular metal patch 221 and connected to the lower surface of the second dielectric substrate 21 are provided on the upper and lower surfaces of the second dielectric substrate 21, respectively. The third lossless layer 23 in the form of a metal patch of equal size can enhance the absorbing performance, thereby narrowing the reflection band. Therefore, the entire band-stop absorber with a narrow reflection band provided by the embodiment of the utility model can realize the absorbing function in the low frequency band of 3.65-7.6 GHz and the high frequency band of 9.13-14.44 GHz, and realize the reflection function in the frequency band of 7.6-9.13 GHz. This structure not only ensures a wider absorbing bandwidth (relative absorbing bandwidth is 102.4%), but also realizes a narrow reflection band.
[0067] See also Figure 8 The absorption rate of the absorbing band of the band-stop type absorber with a narrow reflection band provided by the embodiment of the utility model reaches 85.78%, indicating that the absorbing effect is good.
[0068] In summary, the band-stop absorber with a narrow reflection band provided by the embodiment of the utility model includes one or more resonance units. When multiple resonance units are included, the multiple resonance units form a square array. Each resonance unit includes a first dielectric layer 1 and a second dielectric layer 2 arranged vertically from top to bottom, the first dielectric layer 1 and the second dielectric layer 2 are fixed by a first non-metallic column, and a first air layer 3 of a first preset height is formed between the first dielectric layer 1 and the second dielectric layer 2. The first dielectric layer 1 includes a first dielectric substrate 11, a first lossy layer 12 arranged on the upper surface of the first dielectric substrate 11, and a first lossless layer 13 arranged on the lower surface of the first dielectric substrate 11 and located above the first air layer 3; the second dielectric layer 2 includes a second dielectric substrate 21, a second lossless layer 22 arranged on the upper surface of the second dielectric substrate 21 and located below the first air layer 3, and a third lossless layer 23 arranged on the lower surface of the second dielectric substrate 21; the first lossy layer 12 includes a first annular metal patch 121 and a multiple of four resistors 122, the first annular metal patch 121 is located at the center of the upper surface of the first dielectric substrate 11, and each resistor 122 is electrically connected to the first annular metal patch 121 symmetrically, the ring width of the first annular metal patch 121 is less than the first preset width, wherein the symmetry center of each resistor 122 is the first dielectric The first lossless layer 13 includes four X-shaped metal gap patches 131, which are centrally symmetrically arranged on the lower surface of the first dielectric substrate 11, and the distance between the center of each X-shaped metal gap patch 131 and the center of the lower surface of the first dielectric substrate 11 is greater than the first preset distance, wherein the symmetry center of the four X-shaped metal gap patches 131 is the center of the lower surface of the first dielectric substrate 11; the second lossless layer 22 includes a second annular metal patch 221, which is located at the center of the upper surface of the second dielectric substrate 21, the ring width of the second annular metal patch 221 is greater than the second preset width and the area of the second annular metal patch 221 occupies at least three quarters of the upper surface of the second dielectric substrate 21, and the third lossless layer 23 is a metal patch of the same size as the lower surface of the second dielectric substrate 21.Thus, for each resonant unit, by arranging a first lossy layer 12 in the form of a first annular metal patch 121 electrically connected to a multiple of four resistors 122 on the upper surface of the first dielectric substrate 11, arranging a first lossless layer 13 in the form of four X-shaped metal gap patches 131 on the lower surface of the first dielectric substrate 11, and arranging a second lossless layer 22 in the form of a second annular metal patch 221 occupying at least three quarters of the upper surface of the second dielectric substrate 21 and a third lossless layer 23 in the form of a metal patch equal in size to the lower surface of the second dielectric substrate 21 on the upper and lower surfaces of the second dielectric substrate 21, the wave absorbing performance can be enhanced, thereby narrowing the reflection band and widening the wave absorbing band. Therefore, the band-stop absorber with a narrow reflection band provided in the embodiment of the utility model can absorb electromagnetic waves in more frequency bands to be invisible, thereby improving applicability.
[0069] Furthermore, the band-stop absorber with a narrow reflection band provided by the embodiment of the utility model is composed of only one or more resonance units, and each resonance unit is composed of only a first dielectric layer 1 and a second dielectric layer 2, with a simple structure, a smaller volume, a lighter and thinner overall structure, and reduced costs.
[0070] Based on the above-mentioned band-stop absorber, an embodiment of the utility model further provides an antenna device, comprising an antenna and a band-stop absorber with a narrow reflection band provided by any one of the above-mentioned embodiments, the antenna being installed above the center of the band-stop absorber, the antenna and the band-stop absorber being fixed by a second non-metallic column, and a second air layer of a second preset height being formed between the antenna and the band-stop absorber.
[0071] Exemplarily, the second non-metallic column may be a plastic column. The antenna and the band-stop absorber may be fixedly connected to each other by four first non-metallic columns respectively at four corner points of the antenna and the band-stop absorber through the second non-metallic column. The fixed connection method may be any fixed connection method in the prior art, and the embodiment of the utility model does not impose any limitation on this.
[0072] Therefore, the antenna device provided by the embodiment of the utility model includes an antenna and a band-stop absorber with a narrow reflection band, and each resonant unit in the band-stop absorber can enhance the absorbing performance by arranging a first lossy layer 12 in the form of a first annular metal patch 121 electrically connected to a multiple of four resistors 122 on the upper surface of the first dielectric substrate 11, arranging a first lossless layer 13 in the form of four X-shaped metal gap patches 131 on the lower surface of the first dielectric substrate 11, and arranging a second lossless layer 22 in the form of a second annular metal patch 221 at least occupying three quarters of the upper surface of the second dielectric substrate 21 and a third lossless layer 23 in the form of a metal patch equal to the lower surface of the second dielectric substrate 21 on the upper and lower surfaces of the second dielectric substrate 21, thereby narrowing the reflection band and widening the absorbing band. Therefore, the antenna can absorb electromagnetic waves of more frequency bands to be invisible, thereby improving applicability. At the same time, the integrated function of radiation scattering is realized. And the antenna gain is improved.
[0073] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present utility model.
[0074] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.
[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A band-stop absorber with a narrow reflection band, characterized in that: The device comprises one or more resonance units, and when a plurality of resonance units are included, the plurality of resonance units form a square array; Each resonant unit includes a first dielectric layer and a second dielectric layer arranged vertically from top to bottom, the first dielectric layer and the second dielectric layer are fixed by a first non-metallic column, and a first air layer of a first preset height is formed between the first dielectric layer and the second dielectric layer; The first dielectric layer includes a first dielectric substrate, a first lossy layer disposed on an upper surface of the first dielectric substrate, and a first lossless layer disposed on a lower surface of the first dielectric substrate and located above the first air layer; The second dielectric layer includes a second dielectric substrate, a second lossless layer disposed on the upper surface of the second dielectric substrate and below the first air layer, and a third lossless layer disposed on the lower surface of the second dielectric substrate; The first lossy layer includes a first annular metal patch and a multiple of four resistors, the first annular metal patch is located at the center of the upper surface of the first dielectric substrate, each resistor is electrically connected to the first annular metal patch in a center-symmetrical manner, the ring width of the first annular metal patch is not greater than a first preset width, wherein the symmetry center of each resistor is the center of the upper surface of the first dielectric substrate; The first lossless layer includes four X-shaped metal gap patches, the four X-shaped metal gap patches are centrally symmetrically arranged on the lower surface of the first dielectric substrate, and the distance between the first corner point of each X-shaped metal gap patch and the center of the lower surface of the first dielectric substrate is greater than a first preset distance, the first corner point is the corner point of each X-shaped metal gap patch closest to the center of the lower surface of the first dielectric substrate, wherein the symmetry center of the four X-shaped metal gap patches is the center of the lower surface of the first dielectric substrate; The second lossless layer includes a second annular metal patch, the second annular metal patch is located at the center of the upper surface of the second dielectric substrate, the ring width of the second annular metal patch is greater than the second preset width and the area of the second annular metal patch occupies at least three quarters of the upper surface of the second dielectric substrate; The third lossless layer is a metal patch having the same size as the lower surface of the second dielectric substrate.
2. The band-stop absorber according to claim 1, characterized in that: The number of the resistor sheets is four, the first annular metal patch is a square ring metal patch, and the center positions of the four sides of the first annular metal patch are electrically connected to the four resistor sheets respectively.
3. The band-stop absorber according to claim 1, characterized in that: The X-shaped metal gap patch includes a patch base and a first gap and a second gap which are arranged on the patch base and cross each other and are vertically arranged. The width of the first gap is twice the width of the second gap.
4. The band-stop absorber according to claim 3, characterized in that: The patch base is in a square shape.
5. The band-stop absorber according to claim 3, characterized in that: The first gap is a gap with a closed edge at one end and an unclosed edge at the other end.
6. The band-stop absorber according to claim 3, characterized in that: The second gap is a gap with closed edges at both ends.
7. The band-stop absorber according to claim 1, characterized in that: The thickness of the second dielectric substrate is greater than the thickness of the first dielectric substrate.
8. The band-stop absorber according to claim 1, wherein: The first dielectric substrate and the second dielectric substrate are both square in shape.
9. The band-stop absorber according to claim 1, wherein: The first dielectric substrate and the second dielectric substrate are both made of plates having a dielectric constant less than a preset threshold.
10. An antenna device, characterized in that: The invention comprises an antenna and a band-stop absorber with a narrow reflection band as claimed in any one of claims 1 to 9, wherein the antenna is installed above the center of the band-stop absorber, the antenna and the band-stop absorber are fixed by a second non-metallic column, and a second air layer of a second preset height is formed between the antenna and the band-stop absorber.