Artificial surface plasmon filter

Abstract

The utility model discloses an artificial surface plasmon filter, which belongs to the technical field of microwaves and comprises a ground layer, a dielectric plate A, an SSPP unit layer A, a dielectric plate B, an SSPP unit layer B, a dielectric plate C, an SSPP unit layer C and a half-mode substrate integrated waveguide which are sequentially arranged from bottom to top. A cylinder B is arranged between the SSPP unit layer A and the SSPP unit layer B. A cylinder C is arranged between the SSPP unit layer A and the SSPP unit layer C. The length of the SSPP unit layer B is smaller than that of the SSPP unit layer A. The half-mode substrate integrated waveguide comprises a metal sheet and thirteen cylinders A which are equal in height and radius. The upper surface of the dielectric plate C is provided with two microstrip lines, and the microstrip lines are connected with the metal plate. The size of the filter is reduced through the three-dimensional heterogeneous integration technology, the progressive frequency of an SSPP structure is greatly reduced, the field constraint effect is enhanced, and better performance can be achieved under the condition that the size is more compact.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of artificial surface plasmon (SSPP) filter, belong to microwave technical field, it can be used for broadband receiving system and the application of microwave signal selection. BACKGROUND

[0002] Filter plays an important role in modern wireless communication system. With the rapid development of digital communication technology, people's demand for communication quality is getting higher and higher. Traditional radio frequency and microwave devices have been unable to meet people's demand for high-quality communication. In order to maintain good propagation performance, it is essential to have a high-performance filter in a wide frequency range. Compared with surface plasmon, artificial surface plasmon has the advantages of near-field enhancement, low loss and flexible design. Therefore, artificial surface plasmon has potential application value in device integration and wireless communication.

[0003] Generally, SSPP structure is composed of periodic units, and a certain number of SSPP units are needed to ensure transmission performance, resulting in a large electrical size. Therefore, while maintaining good propagation performance, efforts should be made to reduce the size of the structure. Therefore, the utility model designs a three-dimensional heterogeneous integrated space gyration type SSPP filter. SUMMARY

[0004] The utility model aims at providing a low-loss filter capable of realizing wide passband, low insertion loss, high selectivity, miniaturization and good environmental adaptability.

[0005] To achieve the above-mentioned purpose, the utility model provides an artificial surface plasmon filter, comprising, from bottom to top, a ground layer, a dielectric plate A, an SSPP unit layer A, a dielectric plate B, an SSPP unit layer B, a dielectric plate C, an SSPP unit layer C and a half-mode substrate integrated waveguide.

[0006] The SSPP unit layer A includes 7 equidistantly distributed metal rectangular strips A, the SSPP unit layer B includes 7 equidistantly distributed metal rectangular strips B, the SSPP unit layer C includes 7 equidistantly distributed metal rectangular strips C, the length of the 7 metal rectangular strips B is less than the length of the metal rectangular strips A, the width of the 7 metal rectangular strips B is the same as the width of the metal rectangular strips A, the length and width of the metal rectangular strips A and the metal rectangular strips C are the same,

[0007] One end of the metal rectangular strip A and one end of the metal rectangular strip B corresponding to each other are provided with a cylindrical body B, the other end of the metal rectangular strip A and one end of the metal rectangular strip C corresponding to each other are provided with a cylindrical body C; and one end of the metal rectangular strip B connected with the metal rectangular strip A is aligned with one end of the metal rectangular strip A and the metal rectangular strip C.

[0008] The half die substrate integrated waveguide comprises a metal sheet and thirteen equal-height and equal-radius cylindrical bodies A, the thirteen cylindrical bodies A are equidistantly distributed, one end of the thirteen cylindrical bodies A is connected with one end of the metal sheet, the other end of the thirteen cylindrical bodies A is connected with a ground layer, the other end of the metal sheet is connected with a metal rectangular strip C, and the cylindrical bodies A, the cylindrical bodies B and the cylindrical bodies C are hollow structures.

[0009] The upper surface of the dielectric plate C is provided with two microstrip lines, and the two microstrip lines are connected with the metal sheet.

[0010] Further, the dielectric plate A, the dielectric plate B and the dielectric plate C are of the same size.

[0011] Further, the lengths of the seven metal rectangular strips B are distributed in a transition manner, the lengths of the metal rectangular strips B on both sides gradually increase towards the middle, and the seven metal rectangular strips B are symmetrically distributed.

[0012] Further, the length of the metal rectangular strip B in the middle of the SSPP unit layer B is four-fifths of the length of the metal rectangular strip A.

[0013] Further, the width of the metal sheet is greater than the length of the side of the microstrip line connected with the metal sheet.

[0014] Further, the materials of the ground layer, the dielectric plate A, the metal rectangular strip A, the dielectric plate B, the metal rectangular strip B, the dielectric plate C, the metal rectangular strip C, the metal sheet, the cylindrical bodies A, the cylindrical bodies B and the cylindrical bodies C are metal copper.

[0015] Further, the structure of the microstrip line is rectangular or trapezoidal.

[0016] Further, when the width of the metal rectangular strip A is a constant value, as the total length value of the seven metal rectangular strips A becomes larger and larger, the progressive frequency of the filter becomes lower, and the binding property of the filter to the electromagnetic field becomes stronger.

[0017] Further, when the total length value of the seven metal rectangular strips A is a constant value, as the width of the metal rectangular strip A becomes larger and larger, the progressive frequency of the filter becomes lower, and the binding property of the filter to the electromagnetic field becomes stronger.

[0018] Compared with the prior art, the artificial surface plasmon filter has the advantages of small size, high performance and low cost, which means that better performance can be realized in a more compact size; the three-dimensional heterogeneous integration process is used to realize a multi-layer design scheme, the limitations of single-layer design are overcome, the designed band-pass filter has the advantages of compact size, wide passband, low insertion loss, high selectivity, miniaturization and good environmental adaptability, and provides a new idea for realizing a band-pass filter with higher performance. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the artificial surface plasmonic filter in the utility model.

[0020] Figure 2 It is a structural schematic view of the artificial surface plasmonic filter in the utility model. Figure 1 It is a side view.

[0021] Figure 3 It is an exploded view of the artificial surface plasmonic filter in the utility model. Figure 1

[0022] Figure 4 It is a structural schematic view of SSPP unit layer A, SSPP unit layer B and SSPP unit layer C.

[0023] Figure 5 It is an impedance diagram (a) and a needle frequency response curve diagram (b) of the artificial surface plasmonic filter.

[0024] Wherein, 1, ground layer;2, dielectric plate A;3, SSPP unit layer A;4, dielectric plate B;5, SSPP unit layer B;6, dielectric plate C;7, SSPP unit layer C;8, half-mode substrate integrated waveguide;9, microstrip line;10, metal rectangular strip A;11, metal rectangular strip B;12, metal rectangular strip C;13, cylinder A;14, cylinder B;15, cylinder C. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the utility model is described in detail below with the combination of drawings and specific embodiment.

[0026] As shown in Figures 1-4 An artificial surface plasmonic filter, comprising ground layer 1, dielectric plate A 2, SSPP unit layer A 3, dielectric plate B 4, SSPP unit layer B 5, dielectric plate C 6, SSPP unit layer C 7 and half-mode substrate integrated waveguide 8 arranged sequentially from bottom to top, wherein SSPP unit structure is designed by three-dimensional heterogeneous integration process, and wherein metal rectangular strip is designed in SSPP unit layer A 3, SSPP unit layer B 5 and SSPP unit layer C 7 and connected by cylinder;

[0027] SSPP unit layer A 3 includes 7 equidistantly distributed metal rectangular strips A 10, SSPP unit layer B 5 includes 7 equidistantly distributed metal rectangular strips B 11, SSPP unit layer C 7 includes 7 equidistantly distributed metal rectangular strips C 12, the length of metal rectangular strip B 11 is less than the length of metal rectangular strip A 10, the width of metal rectangular strip B 11 is same with the width of metal rectangular strip A 10, the length and width of metal rectangular strip A 10 and metal rectangular strip C 12 are same,​

[0028] The metal rectangular strip A 10 is provided with a cylindrical body B 14 between one end corresponding to the metal rectangular strip B 11 and the other end corresponding to the metal rectangular strip C 12; and the metal rectangular strip B 11 is provided with one end aligned with one end of the metal rectangular strip A 10 and the metal rectangular strip C 12.

[0029] The half-mode substrate integrated waveguide 8 comprises a metal sheet and thirteen cylindrical bodies A 13 with the same height and radius, the thirteen cylindrical bodies A 13 are equidistantly distributed, one end of the thirteen cylindrical bodies A 13 is connected with the metal sheet, and the other end is connected with the ground layer 1, the cylindrical body A 13, the cylindrical body B 14 and the cylindrical body C 15 are hollow structures.

[0030] The upper surface of the dielectric plate C 6 is provided with two microstrip lines 9, and the two microstrip lines 9 are connected with the metal sheet.

[0031] The dielectric plate A 2, the dielectric plate B 4 and the dielectric plate C 6 have the same size.

[0032] The lengths of the seven metal rectangular strips B 11 are distributed in a transition manner, the lengths of the metal rectangular strips B 11 on both sides increase towards the middle in turn, and the seven metal rectangular strips B 11 are symmetrically distributed.

[0033] The length of the metal rectangular strip B 11 in the middle of the SSPP unit layer B 5 is four-fifths of the length of the metal rectangular strip A 10.

[0034] The width of the metal sheet is greater than the length of the side of the microstrip line 9 connected with the metal sheet.

[0035] The materials of the ground layer 1, the dielectric plate A 2, the metal rectangular strip A 10, the dielectric plate B 4, the metal rectangular strip B 11, the dielectric plate C 6, the metal rectangular strip C 12, the metal sheet, the cylindrical body A 13, the cylindrical body B 14 and the cylindrical body C 15 are metal copper.

[0036] When the width of the metal rectangular strip A 10 is a constant value, as the total length of the seven metal rectangular strips A 10 becomes larger and larger, the progressive frequency of the filter becomes lower and lower, and the binding of the electromagnetic field becomes stronger.

[0037] When the total length of the seven metal rectangular strips A 10 is a constant value, as the width of the metal rectangular strip A 10 becomes larger and larger, the progressive frequency of the filter becomes lower and lower, and the binding of the electromagnetic field becomes stronger.

[0038] The dimensions of an artificial surface plasmon filter in this embodiment are as follows. The following is only one example of this utility model: the material of the ground layer 1 is metallic copper, with a length of 10mm, a width of 12mm, and a thickness of 0.018mm.

[0039] The dielectric substrates A2, B4, and C6 are made of 5880 sheet metal, with a length of 10mm, a width of 12mm, and a thickness of 0.254mm.

[0040] Metal rectangular strip A 10 and metal rectangular strip C 12 are made of copper, with a length of 1.8mm, a width of 0.3mm, and a thickness of 0.018mm.

[0041] Metal rectangular strip B 11 is made of copper. The first strip from the left and the first strip from the right are 1.2mm long, 0.3mm wide, and 0.018mm thick. The second strip from the left and the second strip from the right are 1mm long, 0.3mm wide, and 0.018mm thick. The three strips in the middle are 1.4mm long, 0.3mm wide, and 0.018mm thick.

[0042] Hollow cylinders A13, B14, and C15 are made of copper. Hollow cylinder C15, connected to metal rectangular strip C12, has a radius of 0.1 mm and a height of 0.526 mm. Hollow cylinder B14, connected to metal rectangular strip B11, has a radius of 0.1 mm and a height of 0.272 mm. Hollow cylinder A13, connected to the metal plate, has a radius of 0.1 mm and a height of 0.798 mm.

[0043] The metal plate is made of copper, with a length and width of 5.5 mm and a thickness of 0.018 mm.

[0044] Filter modeling and simulation: such as Figure 5 As shown in (a), this filter meets the requirements for transmission mode conversion and 50-ohm impedance matching. Simulation verification shows that its insertion loss is better than 0.32 dB and its return loss exceeds 16.47 dB. Figure 5 (b)) The out-of-band suppression effect is good, and the upper and lower cutoff frequencies can be adjusted.

[0045] like Figure 5 As shown in (b), the designed filter has the smallest electrical size, operates in the frequency range of 5.92-11.3 GHz, has a center frequency of 8.61 GHz, a relative bandwidth of 62.5%, and high selectivity. Experimental results verify that this technical solution can effectively filter specific frequency signals, has high selectivity within the required bandwidth, and ensures the stability and reliability of the system.

[0046] In summary, the multi-layer design scheme is realized by using the three-dimensional heterogeneous integration process, the limitation of the single-layer design is overcome, the designed band-pass filter has the low-loss filter with compact size, wide passband, low insertion loss, high selectivity, miniaturization and good environmental adaptability, and a new idea is provided for realizing the band-pass filter with higher performance.

[0047] The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited by the above embodiments, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application should be equivalent replacement methods, and are included in the protection scope of the present application.

[0048] The above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application, although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An artificial surface plasmon filter, characterized in that, It includes, from bottom to top, a ground layer (1), dielectric substrate A (2), SSPP unit layer A (3), dielectric substrate B (4), SSPP unit layer B (5), dielectric substrate C (6), SSPP unit layer C (7), and a half-mode substrate integrated waveguide (8); The SSPP unit layer A (3) includes 7 equally spaced metal rectangular strips A (10), the SSPP unit layer B (5) includes 7 equally spaced metal rectangular strips B (11), and the SSPP unit layer C (7) includes 7 equally spaced metal rectangular strips C (12). The length of the 7 metal rectangular strips B (11) is less than the length of the metal rectangular strip A (10), and the width of the 7 metal rectangular strips B (11) is the same as the width of the metal rectangular strip A (10). The length and width of the metal rectangular strips A (10) and C (12) are the same. A cylinder B (14) is provided between one end of the metal rectangular strip A (10) and the corresponding end of the metal rectangular strip B (11), and a cylinder C (15) is provided between the other end of the metal rectangular strip A (10) and the corresponding end of the metal rectangular strip C (12); and the end of the metal rectangular strip B (11) connected to the metal rectangular strip A (10) is aligned with one end of the metal rectangular strip A (10) and the metal rectangular strip C (12); The half-mode substrate integrated waveguide (8) includes a metal sheet and thirteen cylinders A (13) of equal height and radius. The thirteen cylinders A (13) are equidistantly distributed. One end of each cylinder A (13) is connected to one end of the metal sheet, and the other end of each cylinder A (13) is connected to the ground layer (1). The other end of the metal sheet is connected to a metal rectangular strip C (12). The cylinders A (13), B (14), and C (15) are hollow structures. The upper surface of the dielectric plate C (6) is provided with two microstrip lines (9), which are connected to the metal sheet.

2. The artificial surface plasmon filter according to claim 1, characterized in that, The dielectric substrates A (2), B (4), and C (6) are all the same size.

3. The artificial surface plasmon filter according to claim 1, characterized in that, The length distribution of the seven metal rectangular bars B (11) is in a transitional manner, with the length of the metal rectangular bars B (11) on both sides increasing sequentially towards the middle, and the seven metal rectangular bars B (11) are symmetrically distributed.

4. The artificial surface plasmon filter according to claim 1, characterized in that, The length of the metal rectangular strip B (11) in the middle of the SSPP unit layer B (5) is four-fifths of the length of the metal rectangular strip A (10).

5. The artificial surface plasmon filter according to claim 1, characterized in that, The width of the metal sheet is greater than the length of the side of the microstrip line (9) connected to the metal sheet.

6. The artificial surface plasmon filter according to claim 1, characterized in that, The materials of the stratum (1), dielectric plate A (2), metal rectangular strip A (10), dielectric plate B (4), metal rectangular strip B (11), dielectric plate C (6), metal rectangular strip C (12), metal sheet, cylinder A (13), cylinder B (14) and cylinder C (15) are copper.

7. The artificial surface plasmon filter according to claim 1, characterized in that, The structure of the microstrip line (9) is rectangular or trapezoidal.

8. The artificial surface plasmon filter according to claim 1, characterized in that, When the width of the metal rectangular bar A (10) is a fixed value, as the total length of the 7 metal rectangular bars A (10) increases, the asymptotic frequency of the filter decreases and the binding force on the electromagnetic field becomes stronger.

9. The artificial surface plasmon filter according to claim 1, characterized in that, When the total length of the seven metal rectangular bars A (10) is constant, as the width of the metal rectangular bars A (10) increases, the asymptotic frequency of the filter decreases and the confinement of the electromagnetic field becomes stronger.

Images