CN111211422A

CN111211422A - Dual-band frequency-selective surface structure with wide-angle stability

Info

Publication number: CN111211422A
Application number: CN202010197117.9A
Authority: CN
Inventors: 辛美莹; 侯新宇
Original assignee: Beijing Transpacific Technology Development Ltd
Current assignee: Beijing Transpacific Technology Development Ltd
Priority date: 2020-03-19
Filing date: 2020-03-19
Publication date: 2020-05-29

Abstract

The invention relates to the field of novel materials and structures, and provides a dual-band frequency selective surface structure with wide-angle stability, which comprises: the metal plate comprises a first medium plate, a first foam interlayer, a second medium plate and a second foam interlayer which are sequentially stacked from top to bottom, wherein five circular metal patches which are distributed in a triangular mode are printed on the first medium plate, staggered array units and five circular metal patches are printed on the second medium plate, five metal through holes are formed in the first foam interlayer, and the five metal patches on the first medium plate and the five metal patches on the second medium plate are respectively connected in a one-to-one correspondence mode. The dual-band frequency selection device adopts the staggered array unit of the dipoles and the loading dipoles, realizes the dual-band frequency selection function, and has wider bandwidth and better angle stability.

Description

Dual-band frequency selective surface structure with wide-angle stability

Technical Field

The invention belongs to the field of novel materials and structures, and particularly relates to a dual-band frequency selective surface structure with wide-angle stability.

Background

Frequency Selective Surfaces (FSSs) are a periodic array formed by periodically arranging cells (conductive patches or slots) with specific geometric shapes, which can have selective transmission and reflection characteristics for electromagnetic waves with different frequencies, polarizations and angles, and are originally called periodic surfaces, and are spatial filters capable of showing band stop or band pass characteristics for electromagnetic waves.

Over the past few decades, FSS has found widespread use in commercial and military applications, such as fighter stealth, radar antenna radiation suppression, low profile and low RCS antennas, radar absorbing materials, radomes, electromagnetic shielding and electromagnetic compatibility, etc. With the development of wireless communication technology, in order to avoid the interference of adjacent communication devices and other problems, the demand for communication frequency is gradually increased, and single-frequency-band communication cannot meet the requirements of modern communication, so that FSS is also developed in the direction of dual-frequency and multi-frequency.

In the design of the multiband FSS, methods such as a fractal structure, a composite unit, a multilayer cascade structure and the like are mostly adopted, but the FSS of the structures has the problems of difficult processing, narrow working bandwidth, poor polarization stability and poor incident angle stability and the like, and the application of the FSS to equipment such as a radome is limited.

Disclosure of Invention

In order to solve the above problems or at least partially solve the above technical problems, the present application proposes a dual-band frequency selective surface structure having wide-angle stability.

Wherein a dual-band frequency selective surface structure with wide angle stability, comprising: the metal plate comprises a first dielectric plate, a first foam interlayer, a second dielectric plate and a second foam interlayer which are sequentially stacked from top to bottom, wherein the first dielectric plate is printed with five circular metal patches, the second dielectric plate is printed with a staggered array unit and five circular metal patches, and the first foam interlayer is internally provided with five metal through holes which are respectively connected with the five metal patches on the first dielectric plate and the second dielectric plate in a one-to-one correspondence manner.

Optionally, the staggered array on the second dielectric slab comprises a dipole array.

Optionally, the dipole array has a length l of 10mm and a width w of 0.4-0.5 mm.

Optionally, the staggered array on the second dielectric slab further includes a loaded dipole array, where the loaded dipole array is a transformed array having the same relative length as the dipole array, and 3U-shaped structures are loaded on the basis of the dipole array.

Alternatively, the length t of the U-shaped structure is 3mm and the width g of the U-shaped opening is 2 mm.

Optionally, the 3U-shaped structures are equal in size.

Optionally, the first dielectric plate and the second dielectric plate are glass fibers with a dielectric constant of 4.3.

Optionally, the thickness h1 of the first dielectric plate is 0.5mm, and the thickness h2 of the second dielectric plate is 0.4 mm.

Optionally, the radius r of the metal via is 0.5mm, and the thickness of each of the first foam interlayer and the second foam interlayer is 3 mm.

Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:

1. the dual-band antenna adopts a structure formed by staggered arrangement of the simplest dipole structure and the loading dipole structure to realize the dual-band function, and the structure is relatively simple. The staggered array unit with the size of the invention obtains two reflection frequency bands at 4.71GHz and 10.17GHz respectively, and the factors such as the size of the two arrays can be changed by adopting the staggered array method to select the frequency, so as to control the two frequency bands respectively.

2. According to the invention, the composite material laminating technology is adopted, the widths of the two frequency bands are increased, and the circular metal patch and the metal via hole are added, so that the resonance influence generated when the two frequency bands are loaded is fitted, and the stability of the whole structure is increased.

3. The dual-band frequency selection surface structure with wide-angle stability has better angle stability while realizing the dual-band frequency selection function.

Drawings

Fig. 1 is a schematic structural view of a dual-band frequency selective surface structure having wide-angle stability according to the present invention.

FIG. 2 is a top view of a second dielectric plate and a staggered array structure according to the present invention.

Figure 3 is a graph of the reflection coefficient of the interleaved array frequency selective surface of the present invention with a dipole array and a loaded dipole array.

FIG. 4 is a reflection coefficient curve diagram of the dual-band frequency selective surface structure with wide-angle stability under the irradiation of TE polarized incident waves in an angle range of 0-60 degrees.

Detailed Description

The invention will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown.

Embodiments of the present application provide a dual-band frequency selective surface structure with wide-angle stability, as shown in fig. 1 and 2, including: the dielectric plate comprises a first dielectric plate 1, a first foam interlayer 2, a second dielectric plate 3 and a second foam interlayer 4 which are sequentially stacked from top to bottom, wherein the first dielectric plate 1 and the second dielectric plate 3 can be made of glass fibers with dielectric constants of 4.3, and the thicknesses of the first dielectric plate 1 and the second dielectric plate 3 can be respectively h 1-0.5 mm and h 2-0.4 mm. The thickness of each of the first foam interlayer 2 and the second foam interlayer 4 can be h 3-3 mm, wherein five metal through holes 6 are formed in the first foam interlayer 2. The first dielectric plate 1 is printed with five circular metal patches distributed in a triangular shape, the second dielectric plate is printed with the staggered array unit 5 and five circular metal patches, the first dielectric plate 1 and the five metal wafers on the second dielectric plate 3 are connected through the five metal through holes 6 in the first foam interlayer 2, and the radius can be 0.5 mm. The first dielectric plate 1, the first foam interlayer 2, the second dielectric plate 3 and the second foam interlayer 4 can be 10mm long and 11mm wide.

As shown in fig. 2, the staggered array on the second dielectric plate 3 is a dipole array and a loaded dipole array, where the length of the dipole array may be l-10 mm, and the width may be w-0.4-0.5 mm. The loading dipole array can be a loading array with the same relative length of the dipole array, 3U-shaped structures with the same size are loaded on the basis of the dipole array, wherein the length of each U-shaped structure can be t & ltSUB & gt 3mm & lt/SUB & gt, the width of each U-shaped opening can be g & ltSUB & gt 2mm & lt/SUB & gt, 4 metal strips with the length of s & ltSUB & gt 1mm are connected with the 3U-shaped structures, the line width of the loading dipole can be the same as that of the dipole, and the line width of the loading dipole is 0.4-0.5 mm. The metal wafers can be symmetrically arranged in a double triangle manner, and the distances from the dipole array can be 0.3mm, 3.3mm and 6.8mm respectively.

As shown in fig. 3, a graph of the reflection coefficient of the interleaved array frequency selective surface and the dipole array and loaded dipole array described in fig. 2 is shown. Where the solid line represents the staggered array, the dashed line represents the dipole array, and the dotted line represents the loaded dipole array. The figure shows that the dipole array forms a reflection band at 8.99-11.38 GHz, the loading dipole array forms a reflection band at 4.64-5.59 GHz, and the staggered array forms a reflection band at 4.59-5.18 GHz and 8.79-11.71 GHz respectively. After the two arrays are arranged in a staggered mode, the center frequencies of the two frequency bands are respectively offset by 0.14 GHz and 0.01GHz, the low-frequency bandwidth is reduced by 0.36GHz, and the high-frequency bandwidth is increased by 0.53 GHz. Therefore, the dual-band frequency selective surface structure with wide-angle stability can be obtained by controlling two different frequency arrays to be staggered.

As shown in fig. 4, the reflection coefficient curve of the dual-band frequency selective surface structure with wide-angle stability under the irradiation of TE polarized incident waves in the angle range of 0 to 60 °. It can be seen that stop bands are generated around the frequencies of 4.97GHz and 10.22GHz, respectively, and the results vary around each other when the incident angle is changed, indicating that the frequency selective surface has good angular stability.

The above description is only for the purpose of illustrating the technical idea of the present invention, and should not be construed as limiting the present invention, and all modifications, substitutions, improvements and the like that are made within the technical idea and principle of the present invention are within the scope of the present invention.

Claims

1. A dual-band frequency selective surface structure with wide-angle stability, characterized in that it comprises: a first dielectric plate (1), a first foam interlayer (2), a second dielectric plate sequentially stacked from top to bottom (3) A second foam interlayer (4), the first medium plate (1) is printed with five circular metal patches, and the second medium plate is printed with staggered array units (5) and five There are five metal vias (6) in the first foam interlayer, which are respectively connected to the five metal patches on the first dielectric board and the second dielectric board in a one-to-one correspondence. .

2. The dual-band frequency selective surface structure with wide-angle stability according to claim 1, wherein the staggered array on the second dielectric plate (3) comprises a dipole array.

3 . The dual-band frequency selective surface structure with wide-angle stability according to claim 2 , wherein the dipole array has a length l of 10 mm and a width w of 0.4-0.5 mm. 4 .

4. The dual-band frequency selective surface structure with wide-angle stability according to claim 2, wherein the staggered array on the second dielectric plate (3) further comprises a loaded dipole array, wherein the The loaded dipole array is a transformation array with the same relative length as the dipole array, and three U-shaped structures are loaded on the basis of the dipole array.

5 . The dual-band frequency selective surface structure with wide-angle stability according to claim 4 , wherein the length t of the U-shaped structure is 3 mm, and the width g of the U-shaped opening is 2 mm. 6 .

6 . The dual-band frequency selective surface structure with wide-angle stability according to claim 4 , wherein the three U-shaped structures are equal in size. 7 .

7. The dual-band frequency selective surface structure with wide-angle stability according to claim 1, wherein the first dielectric plate (1) and the second dielectric plate (3) have a dielectric constant of 4.3 glass fiber.

8. The dual-band frequency selective surface structure with wide-angle stability according to claim 1, wherein the thickness h1 of the first dielectric plate is 0.5 mm, and the thickness h2 of the second dielectric plate is 0.4 mm.

9. The dual-band frequency selective surface structure with wide-angle stability according to claim 1, wherein the radius r of the metal via (6) is = 0.5 mm, and the first foam interlayer (2 ) and the thickness of the second foam interlayer (4) are both 3mm.