A resistor-loaded dual-polarization ultrawidebandwidth angle-coupled absorber

Abstract

This invention discloses a resistively loaded, dual-polarized, ultra-wideband, angle-tightly coupled absorber, comprising a wide-angle matching layer, a loaded dipole tightly coupled antenna layer, and a metal ground plane layer. The wide-angle matching layer, the loaded dipole tightly coupled antenna layer, and the metal ground plane layer are arranged from top to bottom. An air layer A separates the wide-angle matching layer and the loaded dipole tightly coupled antenna layer, and an air layer B separates the loaded dipole tightly coupled antenna layer and the metal ground plane layer. Based on the antenna reciprocity principle, this invention introduces the design concept of tightly coupled antennas into absorber design, proposing a design for an absorber with dual-polarization, ultra-wideband, and wide-angle characteristics. The design is simple, has a short design cycle, is easy to manufacture, and has a stable structure.

Description

Technical Field

[0001] This invention belongs to the field of microwave device technology and relates to a dual-polarized ultrawide bandwidth angle-coupled absorber based on resistive loading. Background Technology

[0002] With the rapid development of wireless communication technology, various electromagnetic signals permeate the space, interfering with each other and increasingly impacting various electromagnetic devices. To avoid electromagnetic noise interference, the research of microwave absorbers has become a popular research direction. In recent years, microwave absorbers have gradually achieved broadband, multi-frequency, and multi-polarization characteristics, and their performance is also very stable. However, most existing microwave absorbers are designed for cases where electromagnetic waves are incident normally, while in reality, the incident direction of electromagnetic waves is unpredictable. Therefore, there is a demand for microwave absorbers with wide-angle characteristics that can absorb electromagnetic waves from various angles, and their research remains a hot topic and a challenge in both academia and industry.

[0003] To achieve wide-angle absorption characteristics, the most direct method is to design the structure on the vertical plane of the absorber, transforming it from a two-dimensional to a three-dimensional design, thereby better absorbing obliquely incident electromagnetic waves. However, this approach has several drawbacks: first, the three-dimensional structure increases the absorber's cross-section, which is not conducive to practical applications; second, the three-dimensional structure greatly increases the difficulty of assembly and significantly reduces structural stability; third, although most absorbers using this three-dimensional structure do improve absorption capability under oblique electromagnetic wave incidence, they are only effective against electromagnetic waves of a single polarization (TM or TE).

[0004] Tightly coupled antennas are characterized by their wide bandwidth and wide angle. Based on the antenna reciprocity principle, resistive-loaded tightly coupled absorbers can be designed using the relevant concepts of tightly coupled antennas, achieving both a wide operating bandwidth and wide angle characteristics. However, current designs of absorber antennas incorporating tightly coupled antennas primarily focus on the broadband characteristics of the tightly coupled antenna structure. Therefore, utilizing the relevant design concepts and methods of tightly coupled antennas to achieve absorbers with wide angle characteristics remains a worthwhile area of ​​research. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a dual-polarized ultrawide bandwidth tightly coupled absorber based on resistance loading, so as to realize the broadband, dual-polarization and wide-angle characteristics of the absorber.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A resistive-loaded dual-polarized ultrawideband tight-coupled absorber includes a wide-angle matching layer, a loaded dipole tight-coupled antenna layer, and a metal ground plane layer. The wide-angle matching layer, the loaded dipole tight-coupled antenna layer, and the metal ground plane layer are arranged from top to bottom. An air layer A separates the wide-angle matching layer and the loaded dipole tight-coupled antenna layer, and an air layer B separates the loaded dipole tight-coupled antenna layer and the metal ground plane layer.

[0008] Furthermore, the wide-angle matching layer includes a dielectric substrate A and non-metallic vias, wherein the non-metallic vias are uniformly distributed on the dielectric substrate A.

[0009] Furthermore, the dielectric substrate A is an FR4 substrate with a relative permittivity of 4.6 and a loss tangent of 0.02.

[0010] Furthermore, the loaded dipole tightly coupled antenna layer includes a dielectric substrate B, a dipole tightly coupled antenna A, a dipole tightly coupled antenna B, metal vias A and B, a patch resistor A, a patch resistor B, and pads. The dielectric substrate B serves as the base of the entire structure of the loaded dipole tightly coupled antenna layer. The patch resistor A is soldered to the middle of the dipole tightly coupled antenna A. The dipole tightly coupled antenna B is connected to the bottom surface of the loaded dipole tightly coupled antenna layer through metal vias A and B. The patch resistor B is connected to the pads, and the pads are connected to the dipole tightly coupled antenna B through metal vias A and B.

[0011] Furthermore, the dielectric substrate B is an F4B substrate with a dielectric constant of 2.65 and a loss tangent of 0.002.

[0012] Furthermore, the resistance of the chip resistor A is 160 ohms, and the resistance of the chip resistor B is 140 ohms.

[0013] Furthermore, the metal floor layer includes a dielectric substrate C and a metal floor, wherein the metal floor is disposed at the lower part of the dielectric substrate C.

[0014] Furthermore, the metal ground plane is a complete copper coating, attached to the dielectric substrate C, which is an F4B substrate with a relative permittivity of 2.65 and a loss tangent of 0.002.

[0015] Furthermore, the thickness of the air layer A is 1 mm.

[0016] Furthermore, the thickness of the air layer B is 3 mm.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] (1) The present invention adopts a planar design, which is simpler to assemble and has better structural stability compared to the three-dimensional structure of the wide-angle absorber.

[0019] (2) The absorber designed in this invention has the characteristics of dual polarization, ultra-wide bandwidth and wide angle.

[0020] (3) Based on the principle of antenna reciprocity, this invention utilizes the mature theory of tightly coupled antennas to introduce the design method of tightly coupled antennas into the design of absorbers. It has advantages such as low design cost, simple structure, short manufacturing cycle, simple assembly, and light weight.

[0021] The objectives, features, and advantages of the present invention will be further described below in conjunction with embodiments and with reference to the accompanying drawings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the dual-polarized ultrawide bandwidth tightly coupled absorber based on resistive loading according to the present invention;

[0023] Figure 2 This is a schematic diagram of the wide-angle matching layer of the present invention;

[0024] Figure 3 This is a schematic diagram of the top surface of the loaded dipole tightly coupled antenna layer of the present invention;

[0025] Figure 4 This is a schematic diagram of the bottom surface of the loaded dipole tightly coupled antenna layer of the present invention;

[0026] Figure 5 This is a schematic diagram of the metal floor layer of the present invention;

[0027] Figure 6 This is a simulation result of the reflection coefficient of the present invention under the condition of TE polarized oblique incidence of electromagnetic waves;

[0028] Figure 7 This is a simulation result of the reflection coefficient under the condition of oblique incidence of electromagnetic wave TM polarization. Detailed Implementation

[0029] To make the objectives, technical problems to be solved, and technical solutions of this invention clearer, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Figure 1 This is a schematic diagram of the structure of the resistive-loaded dual-polarized ultrawide bandwidth tight-coupled absorber of the present invention. The absorber includes a wide-angle matching layer 1, a loaded dipole tight-coupled antenna layer 2, and a metal ground layer 3.

[0031] There is a 1mm air layer separating the wide-angle matching layer 1 and the loaded dipole tightly coupled antenna layer 2.

[0032] There is a 3mm air layer separating the loaded dipole tightly coupled antenna layer 2 and the metal ground layer 3.

[0033] The thickness of the air layer between the wide-angle matching layer 1 and the loaded dipole tightly coupled antenna layer 2 can be adjusted according to the angle matching effect, and the thickness of the air layer between the loaded dipole tightly coupled antenna layer 2 and the metal ground layer 3 can be adjusted according to the absorption frequency band.

[0034] Figure 2 A detailed view of the wide-angle matching layer 1 is given. The dielectric substrate A 11 is an FR4 substrate with a relative permittivity of 4.6 and a loss tangent of 0.02.

[0035] Non-metallic vias 12 are uniformly distributed on the dielectric substrate A 11, and their radii can be adjusted to change the overall relative permittivity of the wide-angle matching layer 1.

[0036] The wide-angle matching layer 1 improves the angle matching effect by adjusting the radius of the non-metallic through-hole 12 on it to change its equivalent relative permittivity.

[0037] Figure 3 The top structure of the loaded dipole tightly coupled antenna layer 2 is given. The dielectric substrate B 21 serves as the base of the entire structure. It is an F4B substrate with a dielectric constant of 2.65 and a loss tangent of 0.002.

[0038] A 160-ohm patch resistor A 26 is soldered to the middle of the dipole tightly coupled antenna A 22. The dipole tightly coupled antenna B 23 is connected to the structure at the bottom of the loaded dipole tightly coupled antenna layer 2 through metal vias A 24 and B 25.

[0039] The loaded dipole tightly coupled antenna layer 2 adopts the antenna reciprocity principle. Two sets of dipole tightly coupled antennas are loaded with patch resistors. The structural design of the loaded dipole tightly coupled antenna layer 2 adopts two sets of dipole antenna structures to achieve dual-polarization absorption. The unit structure of the structural design of the loaded dipole tightly coupled antenna layer 2 adopts the tightly coupled design concept, and adds interdigitated structures to increase the coupling between units. The antenna size on the loaded dipole tightly coupled antenna layer 2 can be adjusted according to the operating frequency range.

[0040] The antenna structure unit on the loaded dipole tightly coupled antenna layer 2 is composed of an arc surface and interdigitated structures. The real part of the input impedance of a single dipole tightly coupled antenna is a stable value over a wide frequency range, and the imaginary part is very small, which can form a good match with a pure resistor. By changing the feed port of the dipole to a 0402 packaged chip resistor, electromagnetic waves can be converted into heat energy in the resistor.

[0041] Figure 4 The bottom structure of the tightly coupled dipole antenna layer 2 is shown. A 140-ohm patch resistor B 27 is connected to pad 28, and pad 28 is connected to... (The sentence is incomplete and requires more context to translate accurately. It likely refers to a specific antenna layer or structure.) Figure 2 The dipole tightly coupled antenna B23 is connected in the middle.

[0042] Figure 5 A schematic diagram of the metal ground plane 3 is shown. The metal ground plane 32 is a complete copper coating attached to the dielectric substrate C31. The dielectric substrate C31 is an F4B substrate with a relative permittivity of 2.65 and a loss tangent of 0.002.

[0043] Figure 6 The simulation results of the reflection coefficient under the TE polarization oblique incidence of electromagnetic waves are given. As can be seen from the figure, in the range of 0-50° and 5.87-17.78GHz, the electromagnetic energy can be absorbed by the absorber by more than 90%.

[0044] Figure 7 The simulation results of the reflection coefficient under the condition of TM polarization oblique incidence of electromagnetic waves are given. As can be seen from the figure, in the range of 0-50° and 8.74-18.41GHz, the electromagnetic energy can be absorbed by the absorber by more than 90%.

[0045] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention, and should be understood that the scope of protection of the invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed in this invention without departing from the scope of the invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A dual-polarization ultrawide bandwidth tightly coupled absorber based on resistive loading, characterized in that, It includes a wide-angle matching layer (1), a loaded dipole tightly coupled antenna layer (2), and a metal ground layer (3). The wide-angle matching layer (1), the loaded dipole tightly coupled antenna layer (2), and the metal ground layer (3) are arranged from top to bottom. An air layer A separates the wide-angle matching layer (1) and the loaded dipole tightly coupled antenna layer (2), and an air layer B separates the loaded dipole tightly coupled antenna layer (2) and the metal ground layer (3). The thickness of the air layer between the wide-angle matching layer (1) and the loaded dipole tightly coupled antenna layer (2) can be adjusted according to the angle matching effect, and the thickness of the air layer between the loaded dipole tightly coupled antenna layer (2) and the metal ground layer (3) can be adjusted according to the absorption frequency band. The wide-angle matching layer (1) includes a dielectric substrate A (11) and non-metallic vias (12). Non-metallic vias (12) are uniformly distributed on the dielectric substrate A (11). The angle matching effect is improved by adjusting the radius of the non-metallic vias (12) to change their equivalent relative permittivity. The loaded dipole tightly coupled antenna layer (2) includes a dielectric substrate B (21), a dipole tightly coupled antenna A (22), a dipole tightly coupled antenna B (23), a metal via A (24), a metal via B (25), a patch resistor A (26), a patch resistor B (27), and a pad (28). The dielectric substrate B (21) serves as the base of the entire structure of the loaded dipole tightly coupled antenna layer (2). The patch resistor A (26) is soldered to the middle of the dipole tightly coupled antenna A (22). The dipole tightly coupled antenna B (23) is connected to the bottom surface of the loaded dipole tightly coupled antenna layer (2) through the metal via A (24) and the metal via B (25). The patch resistor B (27) is connected to the pad (28). The pad (28) is connected to the dipole tightly coupled antenna B (23) through the metal via A (24) and the metal via B (25). The metal floor layer (3) includes a dielectric substrate C (31) and a metal floor (32), wherein the metal floor (32) is disposed at the lower part of the dielectric substrate C (31); The metal floor (32) is a complete copper coating attached to the dielectric substrate C (31), which is an F4B substrate with a relative permittivity of 2.65 and a loss tangent of 0.

002.

2. The dual-polarization ultrawide bandwidth tightly coupled absorber based on resistance loading according to claim 1, characterized in that, The dielectric substrate A(11) is an FR4 substrate with a relative permittivity of 4.6 and a loss tangent of 0.

02.

3. The dual-polarization ultrawide bandwidth tightly coupled absorber based on resistance loading according to claim 1, characterized in that, The dielectric substrate B(21) is an F4B substrate with a dielectric constant of 2.65 and a loss tangent of 0.

002.

4. The dual-polarization ultrawide bandwidth tightly coupled absorber based on resistance loading according to claim 1, characterized in that, The resistance of the chip resistor A (26) is 160 ohms and the resistance of the chip resistor B (27) is 140 ohms.

5. The dual-polarization ultrawide bandwidth tightly coupled absorber based on resistance loading according to claim 1, characterized in that, The thickness of the air layer A is 1 mm.

6. The dual-polarization ultrawide bandwidth tightly coupled absorber based on resistance loading according to claim 1, characterized in that, The thickness of the air layer B is 3 mm.

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