Double-layer reflecting plate structure capable of effectively avoiding ultra-wideband oblique polarization array resonance points

Abstract

The invention discloses a double-layer reflecting plate structure for effectively avoiding resonance points of an ultra-wideband oblique polarization array. According to the double-layer reflecting plate structure, resonance is suppressed and radiation characteristics are optimized through a double-layer reflecting plate and gap design. The structure is composed of a plurality of reflecting plate units, and each unit comprises an upper-layer reflecting plate, a lower-layer reflecting plate and a supporting column structure connecting the upper-layer reflecting plate and the lower-layer reflecting plate. Through slot coupling control, cavity height optimization and stepped reflection plate arrangement, resonance points of the ultra-wideband oblique polarization antenna are effectively suppressed, the consistency of a radiation pattern is improved, the cross polarization ratio is increased, and the ultra-wideband oblique polarization antenna is suitable for a high-frequency-band wideband communication system.

Description

Technical Field

[0001] This invention belongs to the field of phased array radar technology, and in particular relates to a double-layer reflector structure that effectively avoids the resonance point of an ultra-wideband oblique polarization array. Background Technology

[0002] With technological advancements, the multifunctional requirements of phased array radar necessitate more diverse radiation polarization requirements for antenna arrays, such as dual-linear polarization, circular polarization, or slant polarization at different tilt angles. Currently, the most effective approach is to use dual-polarized antennas, but this increases hardware costs, makes the system larger, and is detrimental to antenna stability and reliability. Another approach is to use slant-polarized antennas, which combine the advantages of single polarization with multi-polarization reception capabilities. In narrow-bandwidth slant polarization, the radiation polarization components can be adjusted and controlled through detailed design to meet performance requirements. However, in ultra-wideband applications, current discontinuities in antenna elements often occur, leading to resonant points within the operating frequency band and affecting antenna radiation. Ensuring no resonant points appear throughout the entire operating frequency band is a key challenge and crucial aspect of constructing ultra-wideband slant-polarized array antenna structures. Summary of the Invention

[0003] The purpose of this invention is to provide a double-layer reflector structure that effectively avoids the resonant point of an ultra-wideband oblique polarization array, thereby solving the above-mentioned technical problems.

[0004] To achieve the objective of this invention, this invention provides a double-layer reflector structure that effectively avoids the resonant point of an ultra-wideband oblique polarization array. The bottom of the ultra-wideband array antenna unit adopts a reflector unit; a plurality of the reflector units constitute a double-layer reflector structure; the reflector unit includes an upper reflector, a lower reflector, and a support structure between the reflectors.

[0005] A cavity is formed between the upper reflector and the lower reflector through the pillar structure between the reflectors; the lower reflectors of the plurality of reflector units are seamlessly connected, and gaps are formed between the upper reflectors above the plurality of lower reflectors.

[0006] The plurality of reflector units are evenly arranged among each other, the upper reflector is smaller than the lower reflector, and the two form a stepped structure to create a gap between the upper reflectors; the lower reflector is the same size as the grid size of the ultra-wideband array antenna unit.

[0007] The slit is an elongated slit structure, and the width of the slit structure is between 2.5% and 7.5% of the wavelength of the center frequency point.

[0008] The upper reflector has a slit structure in the horizontal or vertical direction, and the center of each of the two ends in the direction without slits is provided with a support structure between the reflectors.

[0009] The width of the support structure between the reflectors is between 1 / 4 and 1 / 3 of the side length of the corresponding upper reflector.

[0010] The height of the cavity is between 2.5% and 7.5% of the wavelength at the center frequency.

[0011] The double-layer reflector structure consists of at least 9 reflector units.

[0012] The reflector unit also includes an antenna connector, the ultra-wideband array antenna unit is mounted on the antenna connector, and the antenna connector is mounted on the upper surface of the upper reflector.

[0013] Compared with the prior art, the significant advancements of this invention are as follows: (i) This invention solves the problem of in-band resonance caused by current discontinuity in ultra-wideband slant polarization by employing a double-layer reflector structure, thereby achieving stable radiation characteristics of the ultra-wideband slant polarization array antenna while ensuring structural stability; (ii) This invention suppresses in-band resonance in the ultra-wideband slant polarization array antenna by adjusting the cavity and gap to appropriate sizes, ensuring the radiation stability of the array antenna within the ultra-wideband frequency range.

[0014] 1. Double-layer reflector layout: The upper reflector is smaller than the lower one, forming a stepped structure. The lower reflector is seamlessly connected, and the upper layers are connected by a long strip gap (the width of which is 2.5%-7.5% of the wavelength of the center frequency) to achieve electromagnetic coupling control.

[0015] 2. Cavity and support column design: A cavity is formed between the upper and lower reflectors through the support columns (the height is 2.5%-7.5% of the center frequency wavelength). The support columns are located at both ends of the upper reflector in the seamless direction, and the width is 1 / 4-1 / 3 of its corresponding side length.

[0016] To more clearly illustrate the functional characteristics and structural parameters of the present invention, further explanation is provided below in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a structural diagram of the double-layer reflector unit of the present invention;

[0019] Figure 2 This is a diagram of the uniformly arranged double-layer reflector structure of the present invention;

[0020] Figure 3This is a structural diagram of the ultra-wideband oblique polarized antenna of the present invention loaded onto a double-layer reflector;

[0021] Figure 4 This is a comparison diagram of the standing waves when the ultra-wideband slanted polarized antenna of the present invention is loaded onto a double-layer reflector and a regular reflector;

[0022] Figure 5 This is a gain comparison diagram of the ultra-wideband slanted polarized antenna of the present invention when loaded onto a double-layer reflector and a regular reflector.

[0023] The figures are labeled as follows: 1-1, upper reflector of the reflector unit; 1-2, lower reflector of the reflector unit; 1-3, antenna connector of the reflector unit; 1-4, support structure between the upper and lower reflectors of the reflector unit; 3-1, ultra-wideband slanted polarized antenna; 3-2, double-layer reflector structure; 4-1, voltage standing wave ratio (VSWR) of the ultra-wideband slanted polarized antenna when loaded onto a double-layer reflector; 4-2, voltage VSWR of the ultra-wideband slanted polarized antenna when loaded onto a normal reflector; 5-1, gain of the ultra-wideband slanted polarized antenna when loaded onto a double-layer reflector; 5-2, gain of the ultra-wideband slanted polarized antenna when loaded onto a normal reflector. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] This invention provides a double-layer reflector structure that effectively avoids the resonant point of an ultra-wideband oblique polarization array, combined with Figures 1-3 The bottom of the ultra-wideband array antenna unit 3-1 adopts a reflector unit; several of the reflector units constitute a double-layer reflector structure 3-2; the reflector unit includes an upper reflector 1-1, a lower reflector 1-2, and a support structure 1-4 between the reflectors.

[0026] A cavity is formed between the upper reflector 1-1 and the lower reflector 1-2 through the reflector inter-support structure 1-4; the lower reflectors 1-2 of the plurality of reflector units are seamlessly connected, and gaps are formed between the upper reflectors 1-1 above the plurality of lower reflectors 1-2.

[0027] The plurality of reflector units are evenly arranged among each other. The upper reflector 1-1 is smaller than the lower reflector 1-2, and the two form a stepped structure to form a gap between the upper reflector 1-1. The lower reflector 1-2 is the same size as the grid size of the ultra-wideband array antenna unit 3-1.

[0028] The slit is an elongated slit structure, and the width of the slit structure is between 2.5% and 7.5% of the wavelength of the center frequency point.

[0029] The upper reflector 1-1 has a slit structure in the horizontal or vertical direction, and the center of the two ends in the direction without slits is respectively provided with the reflector support structure 1-4.

[0030] The width of the support structure 1-4 between the reflectors is between 1 / 4 and 1 / 3 of the side length of the corresponding upper reflector 1-1.

[0031] The height of the cavity is between 2.5% and 7.5% of the wavelength at the center frequency.

[0032] In this embodiment, the center frequency wavelength of the antenna is set to 83.33 mm. The thickness of the upper and lower reflector layers in the double-layer reflector unit structure is 1 mm. The cavity structure between the upper and lower reflector layers of the reflector unit is 4.5 mm, which is 5.4% of the wavelength corresponding to the center frequency. The gap between the upper reflector layers of adjacent reflector units is 4.5 mm, which is 5.4% of the wavelength corresponding to the center frequency.

[0033] The double-layer reflector structure 3-2 consists of at least 9 reflector units.

[0034] The reflector unit also includes an antenna connector 1-3, the ultra-wideband array antenna unit 3-1 is mounted on the antenna connector 1-3, and the antenna connector 1-3 is mounted on the upper surface of the upper reflector 1-1.

[0035] Figure 4 Figure 4-1 shows that when an ultra-wideband slanted polarized antenna is loaded onto a conventional reflector, the discontinuity of the current causes the antenna to resonate at 3*F, resulting in a significant increase in the standing wave ratio; simultaneously, Figure 5 Figure 5-1 shows a sharp drop in antenna radiation gain at the corresponding frequency point 3*F. This will cause the antenna to malfunction at that frequency, affecting the ultra-wideband capability.

[0036] When the double-layer reflector structure of the present invention is adopted, Figure 4 The resonant frequency of the display antenna in section 4-2 is effectively suppressed, and the standing wave ratio is well matched across the entire frequency band; at the same time, Figure 5 Figure 5-2 shows that the gain value of the corresponding antenna is more stable and smoother. In the double-layer reflector structure of this invention, the ultra-wideband slanted polarized antenna can effectively avoid the occurrence of resonant points, thus better realizing ultra-wideband operation.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-layer reflector structure that effectively avoids the resonant point of an ultra-wideband oblique polarization array, characterized in that, The bottom of the ultra-wideband array antenna unit (3-1) adopts a reflector unit; several of the reflector units constitute a double-layer reflector structure (3-2); the reflector unit includes an upper reflector (1-1), a lower reflector (1-2), and a support structure (1-4) between the reflectors; The upper reflector (1-1) and the lower reflector (1-2) are connected by a cavity formed by the reflector support structure (1-4); the lower reflectors (1-2) of the plurality of reflector units are seamlessly connected, and the upper reflectors (1-1) above the plurality of lower reflectors (1-2) form gaps.

2. The double-layer reflector structure for effectively avoiding the resonant point of an ultra-wideband oblique polarization array according to claim 1, characterized in that, The plurality of reflector units are evenly arranged among each other. The upper reflector (1-1) is smaller than the lower reflector (1-2), and the two form a stepped structure to form a gap between the upper reflector (1-1). The size of the lower reflector (1-2) is the same as the grid size of the ultra-wideband array antenna unit (3-1).

3. The double-layer reflector structure for effectively avoiding the resonant point of an ultra-wideband oblique polarization array according to claim 2, characterized in that, The slit is an elongated slit structure, and the width of the slit structure is between 2.5% and 7.5% of the wavelength of the center frequency point.

4. The double-layer reflector structure for effectively avoiding the resonant point of an ultra-wideband oblique polarization array according to claim 3, characterized in that, The upper reflector (1-1) has a slit structure in the horizontal or vertical direction, and the center of the two ends in the direction without slits is respectively provided with the inter-reflector support structure (1-4).

5. The double-layer reflector structure for effectively avoiding the resonant point of an ultra-wideband oblique polarization array according to claim 4, characterized in that, The width of the support structure (1-4) between the reflectors is between 1 / 4 and 1 / 3 of the side length of the corresponding upper reflector (1-1).

6. The double-layer reflector structure for effectively avoiding the resonant point of an ultra-wideband oblique polarization array according to claim 1, characterized in that, The height of the cavity is between 2.5% and 7.5% of the wavelength at the center frequency.

7. The double-layer reflector structure for effectively avoiding the resonant point of an ultra-wideband oblique polarization array according to claim 1, characterized in that, The double-layer reflector structure (3-2) consists of at least 9 reflector units.

8. The double-layer reflector structure for effectively avoiding the resonant point of an ultra-wideband oblique polarization array according to claim 1, characterized in that, The reflector unit also includes an antenna connector (1-3), the ultra-wideband array antenna unit (3-1) is mounted on the antenna connector (1-3), and the antenna connector (1-3) is mounted on the upper surface of the upper reflector (1-1).

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