CN111540988A - Ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter - Google Patents

Ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter Download PDF

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Publication number
CN111540988A
CN111540988A CN202010367953.7A CN202010367953A CN111540988A CN 111540988 A CN111540988 A CN 111540988A CN 202010367953 A CN202010367953 A CN 202010367953A CN 111540988 A CN111540988 A CN 111540988A
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comb
transmission line
artificial surface
coplanar waveguide
band
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吴永乐
潘镭丹
王卫民
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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Priority to CN202010367953.7A priority Critical patent/CN111540988A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters

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Abstract

The embodiment of the invention provides an ultrathin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter, which comprises: the comb coupling artificial surface plasmon transmission line comprises a plurality of sequentially arranged surface cells, and the surface cell structure has a low-pass filtering characteristic; comb-shaped coupling structures are etched in the preset width areas on the two sides of the central axis of each surface cell element, and the comb-shaped coupling structures have high-pass characteristics. Therefore, the band-pass filter provided by the embodiment of the invention adopts the ultrathin flexible dielectric plate as the carrier, can be bent in a three-dimensional space, has good stop band suppression performance and broadband performance because the low-pass characteristic is realized by the surface cell structure and the high-pass characteristic is realized by the comb-shaped coupling structure etched in the surface cells, and can independently adjust the high-frequency cut-off frequency and the low-frequency cut-off frequency.

Description

Ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter
Technical Field
The invention relates to the technical field of microwave transmission, in particular to an ultrathin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter.
Background
With the increasing living standard, people's demand for communication equipment is increasing, and the portability of the communication equipment becomes an important index for measuring the quality of the communication equipment. For microwave engineers, it is meant to perform as much circuit design work as possible in the limited space of the handheld mobile terminal device. The design based on the conventional rigid printed circuit board has failed to meet the demand for reducing the circuit volume.
In recent years, with the rapid rise of new consumer electronics markets such as wearable smart devices and unmanned planes, a Flexible Printed Circuit Board (FPC) has emerged. The ultra-thin flexible circuit board can be freely bent, folded and wound, can be freely moved and stretched in a three-dimensional space, and can bear millions of dynamic bending without damaging a circuit, so that the volume of the circuit is maximally reduced, and the portability of the mobile terminal is realized.
Secondly, the ultra-thin flexible circuit board has very high reliability and good heat dissipation performance, a plurality of connectors and wires can be omitted, the wiring volume is greatly reduced, the probability of faults in the circuit is also greatly reduced due to the reduction of welding points and connecting points, the work of line repair in the circuit is greatly reduced, and the cost of the circuit is reduced.
Based on all the advantages of the FPC mentioned above, the FPC has a very wide application prospect in actual design and production, and is widely used in mobile terminals of many products.
Filters are of course indispensable in ultra-thin flexible circuit boards as an extremely critical component in communication systems. However, the conventional filter has some defects, which are expressed as: the bending in the three-dimensional space is not possible, the stop band rejection characteristics are poor, and the high-frequency cut-off frequency and the low-frequency cut-off frequency cannot be adjusted independently.
Disclosure of Invention
The embodiment of the invention aims to provide an ultrathin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter, and aims to solve the technical problems that a traditional filter cannot be bent in a three-dimensional space, has poor stop band rejection characteristics, and cannot independently adjust high-frequency and low-frequency cut-off frequencies.
The specific technical scheme is as follows:
in order to achieve the above object, an embodiment of the present invention provides an ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter, including: the device comprises an input end coplanar waveguide 1, a comb-shaped coupling artificial surface plasmon transmission line 2, an output end coplanar waveguide 3 and an ultrathin flexible dielectric slab 4; wherein, the input end coplanar waveguide 1 is connected with the comb-coupling artificial surface plasmon transmission line 2, and the comb-coupling artificial surface plasmon transmission line 2 is connected with the output end coplanar waveguide 3; the input end coplanar waveguide 1, the comb-coupling artificial surface plasmon transmission line 2 and the output end coplanar waveguide 3 are all covered on the ultrathin flexible dielectric slab 4;
the comb-coupling artificial surface plasmon transmission line 2 comprises a plurality of surface cells 5 which are sequentially arranged, and the structure of the surface cells 5 has a low-pass filtering characteristic; comb-shaped coupling structures 6 are etched in preset width areas on two sides of a central axis of each surface cell 5, and the comb-shaped coupling structures 6 have high-pass filtering characteristics;
the input end coplanar waveguide 1 is used for receiving an input signal and transmitting the input signal to the comb-coupling artificial surface plasmon transmission line 2;
the comb-coupling artificial surface plasmon transmission line 2 is used for forming a signal band-pass passband through the surface cell 5 etched with the comb-coupling structure 6, performing band-pass filtering on the input signal, and transmitting the filtered signal to the output end coplanar waveguide 3;
and the output end is coplanar with the waveguide 3 and is used for outputting the filtered signal.
Optionally, the surface cell 5 is of a bow tie type.
Optionally, the input end coplanar waveguide 1 and the output end coplanar waveguide 3 both include quarter-ellipse ground ports 7 that are symmetrical up and down, and a triangular chamfer is provided in an area close to the quarter-ellipse ground port 7 in the comb-coupled artificial surface plasmon transmission line 2.
Optionally, the input end coplanar waveguide 1, the comb-coupled artificial surface plasmon transmission line 2, and the output end coplanar waveguide 3 are made of metal.
Optionally, the ultra-thin flexible medium plate 4 includes a PI film and an adhesive.
Optionally, the thickness of the PI film is 0.025mm, and the thickness of the adhesive is 0.020 mm.
Optionally, the dielectric constant of the ultrathin flexible dielectric slab is 1GHzrNot more than 4.0, and loss constant tan not more than 0.04.
The ultrathin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter provided by the embodiment of the invention comprises an input end coplanar waveguide, a comb-coupling artificial surface plasma excimer transmission line, an output end coplanar waveguide and an ultrathin flexible dielectric slab, wherein the comb-coupling artificial surface plasma excimer transmission line comprises a plurality of sequentially arranged surface cells, and a comb-coupling structure is etched in a preset width area on two sides of a central axis of each surface cell. Therefore, the band-pass filter provided by the embodiment of the invention adopts the ultrathin flexible dielectric plate as the carrier, can be bent in a three-dimensional space, the low-pass characteristic of the band-pass filter is realized by the surface cell structure, the high-pass characteristic is realized by the comb-shaped coupling structure etched in the surface cells, the band-pass filter has good stop band suppression performance and broadband performance, the high-frequency cut-off frequency of the band-pass filter can be adjusted by changing the size of the surface cells, and the low-frequency cut-off frequency of the band-pass filter can be adjusted by changing the size of the comb-shaped coupling structure, namely the high-frequency cut-off frequency and the low-frequency cut.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an ultra-thin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a surface cell according to an embodiment of the present invention;
FIG. 3 is an enlarged schematic view of a comb-coupling structure according to an embodiment of the present invention;
FIG. 4 is another schematic structural diagram of an ultra-thin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an ultra-thin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter according to an embodiment of the present invention, including dimensional parameters;
fig. 6 is a schematic diagram of a surface cell etched with a comb-coupling structure according to an embodiment of the present invention, including a size parameter;
FIG. 7(a) is a schematic perspective view of an ultra-thin flexible circuit bow-tie artificial surface plasma transmission line according to an embodiment of the present invention in a first bending state;
fig. 7(b) is a schematic perspective view of an ultra-thin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter according to an embodiment of the present invention in a first bending state;
FIG. 7(c) is a schematic plan view of a first bending state provided by an embodiment of the present invention;
FIG. 8(a) is a schematic perspective view of an ultra-thin flexible circuit bow-tie artificial surface plasma transmission line according to an embodiment of the present invention in a second bending state;
FIG. 8(b) is a schematic perspective view of an ultrathin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter according to an embodiment of the present invention in a second bending state;
FIG. 8(c) is a schematic plan view of a second bending state provided by the embodiment of the present invention;
FIG. 9(a) is a schematic perspective view of an ultrathin flexible circuit bow-tie artificial surface plasma transmission line according to an embodiment of the present invention in a third bending state;
fig. 9(b) is a schematic perspective view of a third bending state of the bow-tie artificial surface plasma microwave broadband bandpass filter for an ultrathin flexible circuit according to an embodiment of the present invention;
FIG. 9(c) is a schematic plan view of a third bending state provided by the embodiment of the present invention;
fig. 10 is a dispersion plot of a single surface cell provided by an embodiment of the present invention;
fig. 11 is a schematic diagram of simulation results of return loss and insertion loss of a comb-coupled artificial surface plasmon transmission line in a normal flat state according to an embodiment of the present invention;
fig. 12 is a schematic diagram of simulation results of return loss and insertion loss of a comb-coupled artificial surface plasmon transmission line in a first bending state according to an embodiment of the present invention;
fig. 13 is a schematic diagram of simulation results of return loss and insertion loss of a comb-coupled artificial surface plasmon transmission line in a second bending state according to an embodiment of the present invention;
fig. 14 is a schematic diagram of simulation results of return loss and insertion loss of a comb-coupled artificial surface plasmon transmission line in a third bending state according to an embodiment of the present invention;
FIG. 15 is a schematic diagram of simulation results of return loss and insertion loss of an ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter in a normal flat state according to an embodiment of the present invention;
fig. 16 is a schematic diagram of simulation results of return loss and insertion loss of the ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter in a first bending state according to the embodiment of the present invention;
fig. 17 is a schematic diagram of simulation results of return loss and insertion loss of the ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter in a second bending state according to the embodiment of the present invention;
fig. 18 is a schematic diagram of simulation results of return loss and insertion loss of the ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter in a third bending state according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the technical problems that a traditional band-pass filter cannot be bent in a three-dimensional space, has poor stop band rejection characteristics and cannot independently adjust high-frequency and low-frequency cut-off frequencies, the embodiment of the invention provides an ultrathin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter.
Referring to fig. 1, the ultra-thin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter provided by the embodiment of the present invention may include: the device comprises an input end coplanar waveguide 1, a comb-shaped coupling artificial surface plasmon transmission line 2, an output end coplanar waveguide 3 and an ultrathin flexible dielectric slab 4; wherein the input end coplanar waveguide 1 is connected with the comb-coupling artificial surface plasmon transmission line 2, and the comb-coupling artificial surface plasmon transmission line 2 is connected with the output end coplanar waveguide 3; the input end coplanar waveguide 1, the comb-coupling artificial surface plasmon transmission line 2 and the output end coplanar waveguide 3 are all covered on the ultrathin flexible dielectric slab 4.
The comb-coupling artificial surface plasmon transmission line 2 comprises a plurality of surface cells 5 which are sequentially arranged, and comb-coupling structures 6 are etched in preset width areas on two sides of a central axis of each surface cell 5.
In one embodiment of the present invention, the surface cells may be bow-tie type as shown in fig. 2.
In the embodiment of the present invention, the surface cell can excite plasmon, the dispersion curve of the surface cell has a cut-off frequency, that is, the surface cell itself shown in fig. 2 has a low-pass filtering characteristic, and a plurality of surface cells with the same structure are sequentially connected to form a transmission line, so that the transmission line has the same high-frequency cut-off frequency as that of a single surface cell, that is, the transmission line has a low-pass filtering characteristic. The transmission line composed of a plurality of surface cells has the characteristic of large field binding capacity, and can tightly bind signals on the surface of the transmission line, so that the transmission line can be well applied to an ultrathin flexible circuit for signal transmission.
In addition, a comb-shaped coupling structure is etched in the preset width area on two sides of the central axis of the surface cell element, and the etched comb-shaped coupling structure has a high-pass filtering characteristic. Fig. 3 is an enlarged schematic view of a comb-coupling structure.
Therefore, in the embodiment of the invention, a plurality of surface cells with low-pass characteristics are combined to obtain a transmission line capable of realizing low-pass filtering, and then the high-pass filtering characteristics of the comb-shaped coupling structure etched in the surface cells are combined to obtain a comb-shaped coupling artificial surface plasmon transmission line capable of realizing band-pass filtering, and after signals pass through the comb-shaped coupling artificial surface plasmon transmission line, the band-pass filtering can be completed.
Specifically, in the embodiment of the present invention, the input-end coplanar waveguide 1 receives an input signal and transmits the input signal to the comb-coupled artificial surface plasmon transmission line 2, and in the comb-coupled artificial surface plasmon transmission line 2, the surface cell 5 etched with the comb-coupled structure 6 can form a signal band-pass passband, so that the comb-coupled artificial surface plasmon transmission line 2 performs band-pass filtering on the input signal and transmits the filtered signal to the output-end coplanar waveguide 3, and the output-end coplanar waveguide 3 can output the filtered signal.
The ultrathin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter provided by the embodiment of the invention comprises an input end coplanar waveguide, a comb-coupling artificial surface plasma excimer transmission line, an output end coplanar waveguide and an ultrathin flexible dielectric slab, wherein the comb-coupling artificial surface plasma excimer transmission line comprises a plurality of sequentially arranged surface cells, and a comb-coupling structure is etched in a preset width area on two sides of a central axis of each surface cell. Therefore, the band-pass filter provided by the embodiment of the invention adopts the ultrathin flexible dielectric plate as the carrier, can be bent in a three-dimensional space, the low-pass characteristic of the band-pass filter is realized by the surface cell structure, the high-pass characteristic is realized by the comb-shaped coupling structure etched in the surface cells, the band-pass filter has good stop band suppression performance and broadband performance, the high-frequency cut-off frequency of the band-pass filter can be adjusted by changing the size of the surface cells, and the low-frequency cut-off frequency of the band-pass filter can be adjusted by changing the size of the comb-shaped coupling structure, namely the high-frequency cut-off frequency and the low-frequency cut.
In one embodiment of the invention, the input end coplanar waveguide 1 and the output end coplanar waveguide 3 both comprise quarter-ellipse grounding ports 7 which are symmetrical up and down, and correspondingly, triangular cut angles are arranged in the areas close to the quarter-ellipse grounding ports 7 in the comb-coupled artificial surface plasmon transmission line 2. As shown in fig. 4, a right-angled triangular region is cut out from each of the upper left, lower left, upper right and lower right portions of the comb-coupled artificial surface plasmon transmission line 2.
In the embodiment of the invention, the quarter-ellipse grounding port 7 can realize the transition of electromagnetic waves from the coplanar waveguide to the comb-coupling artificial surface plasmon transmission line 2, and can complete the smooth conversion of an electromagnetic field by combining a triangular corner cutting structure arranged in the comb-coupling artificial surface plasmon transmission line 2, thereby realizing the high-efficiency transmission of energy.
In one embodiment of the invention, the input end coplanar waveguide 1, the comb-coupling artificial surface plasmon transmission line 2 and the output end coplanar waveguide 3 are all made of metal materials.
In one embodiment of the present invention, the ultra-thin flexible media sheet may include a PI film and an adhesive. Wherein, the PI film is short for polyimide film, and the adhesive is arranged between the PI film and the metal.
In one embodiment of the invention, the thickness of the PI film is 0.025mm, the thickness of the adhesive is 0.020mm, and the thickness of the single-sided metal is 0.018 mm.
In one embodiment of the invention, the dielectric constant of the ultrathin flexible dielectric plate is 1GHzrNot more than 4.0, and loss constant tan not more than 0.04.
In the embodiment of the invention, the size of each component in the band-pass filter can be set according to actual requirements. As an example, reference may be made to fig. 5 and 6, where fig. 5 is a schematic diagram of an ultra-thin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter according to an embodiment of the present invention, and fig. 6 is a schematic diagram of a surface cell etched with a comb-coupling structure according to an embodiment of the present invention.
The specific layout parameters are as follows:
w0＝40.112mm,l0＝154.2mm,w1＝3.2mm,s1＝0.231mm,l1＝14.1mm,w2＝3.6mm,l2＝42mm,w3＝2.654mm,l3＝4mm,d＝6mm,c1＝2mm,c2＝4mm,a＝18.225mm,b＝37mm,w4＝0.1mm,s4＝0.1mm,l4＝1.5mm。
the ultrathin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter provided by the embodiment of the invention can be freely bent in a three-dimensional space, and has small influence on the performance of the filter. The following description will be made by taking three bending states as examples.
FIG. 7(a) is a schematic perspective view of an ultra-thin flexible circuit bow-tie artificial surface plasma transmission line according to an embodiment of the present invention in a first bending state; fig. 7(b) is a schematic perspective view of a first bending state of an ultra-thin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter according to an embodiment of the present invention, and fig. 7(c) is a schematic plan view of the first bending state according to the embodiment of the present invention; FIG. 8(a) is a schematic perspective view of an ultra-thin flexible circuit bow-tie artificial surface plasma transmission line according to an embodiment of the present invention in a second bending state; fig. 8(b) is a schematic perspective view of a second bending state of the ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter according to the embodiment of the present invention, and fig. 8(c) is a schematic plan view of the second bending state according to the embodiment of the present invention; FIG. 9(a) is a schematic perspective view of an ultrathin flexible circuit bow-tie artificial surface plasma transmission line according to an embodiment of the present invention in a third bending state; fig. 9(b) is a schematic perspective view of a third bending state of the bow tie artificial surface plasmon microwave broadband bandpass filter for the ultrathin flexible circuit according to the embodiment of the present invention, and fig. 9(c) is a schematic plan view of the third bending state according to the embodiment of the present invention.
In the first bending state, as shown in fig. 7(a), 7(b) and 7(c), the metal surface faces upward, the ultra-thin flexible dielectric plate faces downward, and the ultra-thin flexible dielectric plate is bent 10 ° in an arc shape along the horizontal direction of the transmission line. In the second bending state, as shown in fig. 8(a), 8(b) and 8(c), the metal surface faces upward, the ultra-thin flexible dielectric plate faces downward, and the ultra-thin flexible dielectric plate is smoothly bent in a zigzag manner along the horizontal direction of the transmission line, and two bent edges form an included angle of 15 degrees with the horizontal plane; in the third bending state, as shown in fig. 9(a), 9(b) and 9(c), the metal surface faces upward, the ultra-thin flexible dielectric plate faces downward, and the ultra-thin flexible dielectric plate is bent in an arc shape by 60 ° along the vertical direction of the transmission line.
The following parts analyze the filtering performance of the ultrathin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter provided by the embodiment of the invention in a normal state and different bending states through simulation results.
Referring to fig. 10, fig. 10 is a dispersion curve diagram of a single surface cell according to an embodiment of the present invention, where the horizontal axis of fig. 10 is kd/2 pi, which represents a normalized phase, and the vertical axis represents a frequency, and fig. 10 shows that the high-frequency cutoff frequency of a single surface cell is about 10.56GHz, and the high-frequency cutoff frequency of a transmission line composed of surface cells is also 10.56 GHz.
Referring to fig. 11-14, fig. 11 is a schematic diagram of simulation results of return loss and insertion loss of a comb-coupled artificial surface plasmon transmission line in a normal flat state according to an embodiment of the present inventionFig. 12 is a schematic diagram of simulation results of return loss and insertion loss of a comb-coupled artificial surface plasmon transmission line in a first bending state according to an embodiment of the present invention, fig. 13 is a schematic diagram of simulation results of return loss and insertion loss of a comb-coupled artificial surface plasmon transmission line in a second bending state according to an embodiment of the present invention, fig. 14 is a schematic diagram of simulation results of return loss and insertion loss of a comb-coupled artificial surface plasmon transmission line in a third bending state according to an embodiment of the present invention, and S in fig. 11 to 1411The curve represents the echo coefficient of the signal, S21The curve represents the insertion loss of the signal, with frequency on the abscissa and in GHz and S-parameter of the filter on the ordinate in dB.
It can be seen that the return loss of the curves of the comb-coupled artificial surface plasmon transmission line in the normal flat state and the three bending states is basically controlled to be more than 10dB in the pass band, the insertion loss is kept to be about 2-3dB in the pass band, and the insertion loss is more than 20dB in the stop band, so that the comb-coupled artificial surface plasmon transmission line has good stop band rejection characteristics. Except that the high-frequency cut-off frequency of the transmission line in the first bending state is reduced, the cut-off frequencies of the transmission lines in the other two bending states are basically consistent with the cut-off frequency of the transmission line in the normal flat state. This is because the first bending state changes the cutoff frequency of the bow-tie cells in the transmission line, thereby changing the cutoff frequency of the transmission line.
Referring to fig. 15 to 18, fig. 15 is a schematic diagram of simulation results of return loss and insertion loss of an ultrathin flexible circuit bowtie artificial surface plasma microwave broadband band-pass filter in a normal flat state, fig. 16 is a schematic diagram of simulation results of return loss and insertion loss of an ultrathin flexible circuit bowtie artificial surface plasma microwave broadband band-pass filter in a first bending state, fig. 17 is a schematic diagram of simulation results of return loss and insertion loss of an ultrathin flexible circuit bowtie artificial surface plasma microwave broadband band-pass filter in a second bending state, and fig. 18 is a schematic diagram of simulation results of return loss and insertion loss of an ultrathin flexible circuit bowtie artificial surface plasma band-pass filter in an embodiment of the present inventionAnd a simulation result schematic diagram of return loss and insertion loss of the bulk microwave broadband band-pass filter in a third bending state. S in FIGS. 15-1811The curve represents the echo coefficient of the signal, S21The curve represents the insertion loss of the signal, with frequency on the abscissa and in GHz and S-parameter of the filter on the ordinate in dB.
Therefore, the return loss of the curves of the ultrathin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter in the normal flat state and the three bending states is basically controlled to be more than 10dB in the pass band, the insertion loss is kept to be about 3-4dB in the pass band and is more than 20dB in the stop band, and therefore the ultrathin flexible circuit bow-tie artificial surface plasma microwave broadband band-pass filter has good stop band rejection characteristics.
The low-pass cut-off frequency of the comb-shaped coupling structure in a normal flat state is about 1.06GHz, and the equivalent capacitance inductance value of the comb-shaped coupling structure can be changed in a bent state, so that the low-frequency cut-off frequency of the comb-shaped coupling structure has small-range drift. In addition, similar to the comb-coupled artificial surface plasmon transmission line, the high-frequency cut-off frequency of the band-pass filter provided by the embodiment of the invention is basically consistent with the high-frequency cut-off frequency of the filter in the normal flat state under the other two bending conditions except that the high-frequency cut-off frequency of the transmission line in the first bending state is reduced. According to observation results, the bandwidth of the filter in the normal flat state and the second and third bending states is basically kept to be about 8.31GHz-9.26GHz except for the first bending state, and the broadband performance of the band-pass filter is realized.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (7)

1. The utility model provides an ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter which characterized in that includes:
the device comprises an input end coplanar waveguide (1), a comb coupling artificial surface plasmon transmission line (2), an output end coplanar waveguide (3) and an ultrathin flexible dielectric slab (4); wherein the input end coplanar waveguide (1) is connected with the comb-coupled artificial surface plasmon transmission line (2), and the comb-coupled artificial surface plasmon transmission line (2) is connected with the output end coplanar waveguide (3); the input end coplanar waveguide (1), the comb coupling artificial surface plasmon transmission line (2) and the output end coplanar waveguide (3) are covered on the ultrathin flexible dielectric slab (4);
the comb-coupling artificial surface plasmon transmission line (2) comprises a plurality of surface cells (5) which are sequentially arranged, and the structure of the surface cells (5) has a low-pass filtering characteristic; comb-shaped coupling structures (6) are etched in preset width areas on two sides of a central axis of each surface cell (5), and the comb-shaped coupling structures (6) have high-pass filtering characteristics;
the input end coplanar waveguide (1) is used for receiving an input signal and transmitting the input signal to the comb-coupled artificial surface plasmon transmission line (2);
the comb coupling artificial surface plasmon transmission line (2) is used for forming a signal band-pass passband through the surface cell (5) etched with the comb coupling structure (6), performing band-pass filtering on the input signal, and transmitting the filtered signal to the output end coplanar waveguide (3);
and the output end coplanar waveguide (3) is used for outputting the filtered signal.
2. The bandpass filter according to claim 1, characterized in that the surface cells (5) are of the bowtie type.
3. The band-pass filter according to claim 1, characterized in that the input-side coplanar waveguide (1) and the output-side coplanar waveguide (3) each comprise an upper and lower symmetrical quarter-ellipse ground port (7), and in the comb-coupled artificial surface plasmon transmission line (2), a region close to the quarter-ellipse ground port (7) is provided with a triangular cut angle.
4. The band-pass filter according to claim 1, characterized in that the input-side coplanar waveguide (1), the comb-coupled artificial surface plasmon transmission line (2) and the output-side coplanar waveguide (3) are metallic.
5. The bandpass filter according to claim 1, characterized in that the ultra-thin flexible dielectric sheet (4) comprises a PI film and an adhesive.
6. The bandpass filter according to claim 5, wherein the thickness of the PI film is 0.025mm and the thickness of the adhesive is 0.020 mm.
7. The bandpass filter according to claim 5, wherein the ultra-thin flexible dielectric sheet has a dielectric constant at 1GHzrNot more than 4.0, and loss constant tan not more than 0.04.
CN202010367953.7A 2020-04-30 2020-04-30 Ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter Pending CN111540988A (en)

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CN112002969A (en) * 2020-08-31 2020-11-27 北京邮电大学 Ultrathin flexible bow-tie interdigital artificial surface plasmon polariton coplanar band-pass filter
CN114335933A (en) * 2021-12-31 2022-04-12 重庆幂天通讯设备制造有限责任公司 Bendable phase shifter of phased array satellite and control method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112002969A (en) * 2020-08-31 2020-11-27 北京邮电大学 Ultrathin flexible bow-tie interdigital artificial surface plasmon polariton coplanar band-pass filter
CN114335933A (en) * 2021-12-31 2022-04-12 重庆幂天通讯设备制造有限责任公司 Bendable phase shifter of phased array satellite and control method

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Application publication date: 20200814