A coplanar waveguide-artificial surface plasmon dispersion compensation filter

Abstract

The present invention provides a coplanar waveguide-artificial surface plasmon dispersion compensation filter, comprising a dielectric substrate (1), a microstrip T-junction power divider (2), a short-circuit coplanar waveguide (3), a coplanar waveguide-artificial surface plasmon transition section (4) and a multi-period artificial surface plasmon transmission line (5); the two arms of the microstrip T-junction power divider are composed of step impedance microstrip lines, and respectively span the short-circuit coplanar waveguide gaps on both sides, and have cutoff and broadband coupling characteristics; the coplanar waveguide-artificial surface plasmon transition section includes a gradually opened metal part and a metal part with a gradually deepening groove depth; the multi-period artificial surface plasmon transmission line includes a plurality of cascaded artificial surface plasmon transmission line units, and has cutoff and multiple dispersion characteristics. The filter can compensate for the phase and waveform distortion generated by the signal passing through other components of the system while filtering, thereby ensuring the signal integrity of the system.

Description

Technical Field

[0001] The invention relates to a filter, in particular to a coplanar waveguide-artificial surface plasmon dispersion compensation filter. Background Art

[0002] The dispersion effect will deteriorate the signal integrity of the system. In modern broadband communication systems, the transmitted signal is composed of many frequency components. When the signal passes through the system components, such as substrate integrated waveguides, filters and low noise amplifiers, the phase and group velocities of each frequency component are not only different, but the phase and group velocities also change with the frequency. In this way, the relationship between the various frequency components of the signal changes, causing the phase and waveform distortion of the transmitted signal, resulting in deterioration of signal integrity. In order to reduce the generated phase distortion, a separate group delay equalizer is often used in the system to compensate for the dispersion effect of the signal. This method increases the transmission loss and the complexity of system design.

[0003] As an indispensable and important part of the system network, the basic function of the filter is to make the passband signal pass as lossless as possible and attenuate the stopband signal. However, modern broadband systems often require filters to provide dispersion compensation at the same time. Since the requirements of the amplitude-frequency characteristics and delay characteristics of the minimum phase shift filter are often contradictory, the existing filters often cannot meet the requirements of system dispersion compensation while achieving good filtering functions. Summary of the invention

[0004] Technical problem: The purpose of the present invention is to propose a coplanar waveguide-artificial surface plasmon dispersion compensation filter, which not only has the function of filtering, but also has a variety of nonlinear dispersion characteristics, can achieve a variety of dispersion compensation, and there are many types of dispersion compensation. Without increasing the transmission loss and system complexity, the dispersion characteristics of the filter can compensate for the phase and waveform distortion of the signal generated by other components of the system, thereby ensuring the signal integrity of the system.

[0005] Technical solution: The coplanar waveguide-artificial surface plasmon dispersion compensation filter of the present invention comprises a dielectric substrate, a microstrip T-junction power divider, a short-circuit coplanar waveguide, a coplanar waveguide-artificial surface plasmon transition section, a multi-period artificial surface plasmon transmission line and a port; the guide strip of the microstrip T-junction power divider is located on the upper surface of the dielectric substrate, and the short-circuit coplanar waveguide, the coplanar waveguide-artificial surface plasmon transition section and the multi-period artificial surface plasmon transmission line are located on the lower surface of the dielectric substrate; the structure of the filter is symmetrically arranged on both sides relative to the midline; on the upper surface, the microstrip T-junction power divider is located at the outer terminal port of the filter, and the two arms at the inner end of the microstrip T-junction power divider are both composed of step impedance microstrip lines; on the lower surface, the multi-period artificial surface plasmon transmission line is located in the middle of the filter, and the two ends of the multi-period artificial surface plasmon transmission line are respectively connected to the coplanar waveguide-artificial surface plasmon transition section, and the other end of the coplanar waveguide-artificial surface plasmon transition section is connected to the short-circuit coplanar waveguide.

[0006] The coplanar waveguide-artificial surface plasmon transition section includes a gradually expanding metal part and a metal part with a gradually deepening groove depth; the metal part with a gradually deepening groove depth is located on the midline of the length direction of the filter, and is internally terminated with a multi-period artificial surface plasmon transmission line and externally terminated with a metal conductor of a short-circuited coplanar waveguide; there are two gradually expanding metal parts, which are respectively located on both sides of the metal part with a gradually deepening groove depth.

[0007] The short-circuit coplanar waveguide comprises a short-circuit coplanar waveguide gap, which is located between the gradually expanding metal part and the metal connected to the outer end of the metal part with a gradually deepening groove depth.

[0008] The step impedance microstrip line is located at the inner end of the microstrip T-junction power divider, spanning the short-circuited coplanar waveguide gap to the gradually opened metal part; the longer the length of the open-circuited end of the step impedance microstrip line and the longer the length from the short-circuited end of the short-circuited coplanar waveguide gap to the step impedance microstrip line, the lower the center frequency of the filter.

[0009] The multi-periodic artificial surface plasmon transmission line comprises a plurality of cascaded artificial surface plasmon transmission line units, wherein a plurality of periodically arranged first metal conductor slotted structures, a plurality of periodically arranged second metal conductor slotted structures and a plurality of periodically arranged third metal conductor slotted structure units are cascaded; the inner ends of the first metal conductor slotted structures and the third metal conductor slotted structures are connected to the second metal conductor slotted structures, and the outer ends are connected to metal parts with gradually deepening slot depths.

[0010] In the multi-period artificial surface plasmon transmission line, the width or period length of the first metal conductor slot structure slot, the width or period length of the second metal conductor slot structure slot, and the width or period length of the third metal conductor slot structure slot are increased at the same time, and the degree of dispersion nonlinearity in the entire passband is increased.

[0011] When the depths of the first metal conductor slot structure, the second metal conductor slot structure, and the third metal conductor slot structure are increased individually, the degree of dispersion nonlinearity in the high-frequency part of the passband increases.

[0012] A first optically controlled PIN switch diode is loaded on both sides of the first metal conductor slot structure slot, a second optically controlled PIN switch diode is loaded on both sides of the second metal conductor slot structure slot, and a third optically controlled PIN switch diode is loaded on both sides of the third metal conductor slot structure slot. By turning on the optically controlled PIN switch diodes simultaneously or individually, the dispersion nonlinear characteristics in the passband are reconstructed.

[0013] The dielectric substrate is a plate with a relative dielectric constant of 6.4 and a thickness of 1.524 mm.

[0014] The filter is a two-port network. When the signal flows into the network from the port, the microstrip T-junction power divider evenly distributes the signal energy to the step impedance microstrip lines in its two arms; the step impedance microstrip line couples the signal to the short-circuited coplanar waveguide gap on the lower surface across it on both sides through magnetic coupling. This process filters the signal. The quarter wavelength corresponding to the center frequency of the passband is equal to the length of the open end of the step impedance microstrip line and the length from the short-circuited end of the short-circuited coplanar waveguide gap to the step impedance microstrip line. The step impedance microstrip line introduces impedance changes at the intersection of the step impedance microstrip line and the short-circuited coplanar waveguide gap, and compensates for the discontinuity of the coupling structure in situ to obtain a wider bandwidth and higher in-band flatness. The signal in the short-circuited coplanar waveguide on the lower surface reaches the multi-period artificial surface plasmon transmission line after passing through the coplanar waveguide-artificial surface plasmon transition section composed of the gradually opened metal part and the metal part with the gradually deepening groove depth. The signal changes from the field mode of the coplanar waveguide to the artificial surface plasmon mode, thereby realizing the mode matching between the coplanar waveguide and the artificial surface plasmon. Due to the nonlinear dispersion characteristics and cutoff characteristics of the artificial surface plasmon, the signal passing through a certain length of the multi-period artificial surface plasmon transmission line is filtered and dispersed, and the amplitude-frequency response shows that the signal in the passband is transmitted at a low loss, the signal in the stopband is greatly attenuated, and the phase-frequency response shows that the signal in the passband has a nonlinear time delay.

[0015] The multi-period artificial surface plasmon transmission line includes a plurality of cascaded artificial surface plasmon transmission line units, and different artificial surface plasmon transmission line units can be cascaded by a plurality of metal conductor slotted structure units arranged in different periods, so that the multi-period artificial surface plasmon transmission line has a plurality of adjustable parameters, including the depth, width and period length of the metal conductor slotted structure slot, etc. These parameters can be adjusted simultaneously or individually, and can adjust the overall nonlinear dispersion level in the passband, and can only adjust the nonlinear dispersion level of the high-frequency part in the passband, and can obtain a variety of continuously adjustable nonlinear dispersion characteristic curves, realize a variety of dispersion compensation and a variety of dispersion compensation types. At this time, the system signal has achieved filtering and a variety of dispersion compensation, that is, the coplanar waveguide-artificial surface plasmon dispersion compensation filter has the ability to compensate for the phase and waveform distortion of the signal generated by other components of the system while filtering, thereby ensuring the signal integrity of the system.

[0016] Beneficial effects: The beneficial effects of the present invention are:

[0017] (1) The present invention proposes a coplanar waveguide-artificial surface plasmon dispersion compensation filter, which utilizes the nonlinear dispersion characteristics of multi-period artificial surface plasmons to achieve multiple dispersion compensations, and can compensate for the phase and waveform distortions of the signal generated by other components of the system, thereby ensuring the signal integrity of the system.

[0018] (2) The present invention utilizes the step impedance microstrip line and the short-circuited coplanar waveguide slot coupling structure, as well as the cutoff characteristics of the multi-period artificial surface plasmon transmission line to achieve the filtering function.

[0019] (3) The present invention can realize various nonlinear dispersion characteristics and has various types of dispersion compensation by simultaneously or individually adjusting the depth, width, period length and number of periods of the metal conductor slot structure and by simultaneously or individually turning on the loaded optically controlled PIN diode.

[0020] (4) The present invention has the characteristics of small size, simple structure and low cost, and is easy to process and manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic diagram of the structure of a coplanar waveguide-artificial surface plasmon dispersion compensation filter.

[0022] Figure 2 It is a partially enlarged schematic diagram of the front structure of a coplanar waveguide-artificial surface plasmon dispersion compensation filter of the present invention.

[0023] Figure 3 It is a schematic diagram of the back structure of a coplanar waveguide-artificial surface plasmon dispersion compensation filter of the present invention.

[0024] Figure 4 It is a schematic diagram of a first metal conductor slotted structure, a second metal conductor slotted structure, and a third metal conductor slotted structure in a coplanar waveguide-artificial surface plasmon dispersion compensation filter of the present invention.

[0025] Figure 5 It is a group delay simulation result curve diagram when the first metal conductor slot structure, the second metal conductor slot structure and the third metal conductor slot structure in a coplanar waveguide-artificial surface plasmon dispersion compensation filter of the present invention are all the same.

[0026] Figure 6 The present invention is a curve diagram of S parameter simulation results when the first metal conductor slot structure, the second metal conductor slot structure and the third metal conductor slot structure in a coplanar waveguide-artificial surface plasmon dispersion compensation filter are all the same.

[0027] Figure 7 The present invention is a curve diagram of the simulation result of the group delay of the high frequency part in the passband when the depth h3 of the third metal conductor slot structure groove is changed alone, and the depth h2 of the second metal conductor slot structure groove is changed alone in a coplanar waveguide-artificial surface plasmon dispersion compensation filter of the present invention.

[0028] Figure 8 It is a structural schematic diagram of a light-controlled PIN switch diode loaded in a coplanar waveguide-artificial surface plasmon dispersion compensation filter of the present invention.

[0029] Fig. 9 It is a schematic diagram of a first metal conductor slotted structure loaded with a first light-controlled PIN switch diode, a second metal conductor slotted structure loaded with a second light-controlled PIN switch diode, and a third metal conductor slotted structure loaded with a third light-controlled PIN switch diode in a coplanar waveguide-artificial surface plasmon dispersion compensation filter of the present invention.

[0030] The figure includes: dielectric substrate 1, microstrip T-junction power divider 2, step impedance microstrip line 21, short-circuited coplanar waveguide 3, short-circuited coplanar waveguide gap 31, coplanar waveguide-artificial surface plasmon transition section 4, gradually opened metal part 41, metal part 42 with gradually deepening groove depth, multi-period artificial surface plasmon transmission line 5, first metal conductor slot structure 51, second metal conductor slot structure 52, third metal conductor slot structure 53, port 6, multi-period artificial surface plasmon transmission line 7 loaded with light-controlled PIN switch diode, first light-controlled PIN switch diode 71, second light-controlled PIN switch diode 72 and third light-controlled PIN switch diode 73. The depth of the first metal conductor slot structure is h1, the depth of the second metal conductor slot structure is h2, and the depth of the third metal conductor slot structure is h3. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and cannot be used to limit the present invention.

[0032] The invention discloses a coplanar waveguide-artificial surface plasmon dispersion compensation filter, which is characterized in that the filter comprises a dielectric substrate 1, a microstrip T-junction power divider 2, a short-circuit coplanar waveguide 3, a coplanar waveguide-artificial surface plasmon transition section 4, a multi-period artificial surface plasmon transmission line 5 and a port 6; the guide band of the microstrip T-junction power divider 2 is located on the upper surface of the dielectric substrate 1, and the short-circuit coplanar waveguide 3, the coplanar waveguide-artificial surface plasmon transition section 4 and the multi-period artificial surface plasmon transmission line 5 are located on the lower surface of the dielectric substrate 1. The structure of the filter is symmetrically arranged on both sides of the midline; on the upper surface, a microstrip T-junction power divider 2 is located at the outer end of the filter and connected to a port 6, and both arms at its inner end are composed of a step impedance microstrip line 21; on the lower surface, a multi-period artificial surface plasmon transmission line 5 is located in the middle of the filter, and its two ends are respectively connected to a coplanar waveguide-artificial surface plasmon transition section 4, and the other end of the coplanar waveguide-artificial surface plasmon transition section 4 is connected to a short-circuited coplanar waveguide 3.

[0033] The multi-period artificial surface plasmon transmission line 5 includes a plurality of cascaded artificial surface plasmon transmission line units, has a cutoff characteristic and a variety of nonlinear dispersion characteristics, and can realize filtering and a variety of dispersion compensation. The coplanar waveguide-artificial surface plasmon transition section 4 includes a gradually opened metal part 41 and a gradually deepening metal part 42; the gradually deepening metal part 42 is located on the midline of the length direction of the filter, and is terminated with the multi-period artificial surface plasmon transmission line 5 at the inner end and the metal conductor of the short-circuit coplanar waveguide 3 at the outer end; there are two gradually opened metal parts 41, which are respectively located on both sides of the gradually deepening metal part 42. The short-circuit coplanar waveguide 3 includes a short-circuit coplanar waveguide gap 31, which is located between the metal parts connected to the outer ends of the gradually opened metal part 41 and the gradually deepening metal part 42. The step impedance microstrip line 21 is located at the inner end of the microstrip T-junction power divider 2, spans the short-circuited coplanar waveguide slot 31 to the gradually opened metal part 41, and forms a coupling structure with the short-circuited coplanar waveguide slot 31, having cutoff characteristics and broadband coupling characteristics.

[0034] For clear and accurate representation and description, the present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0035] Embodiment 1: The filter is a two-port network, as shown in the attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 As shown, Figure 1 is a schematic diagram of the filter structure of the present invention, Figure 2It is a partial enlarged schematic diagram of the front structure of the filter of the present invention. Figure 3 It is a schematic diagram of the back structure of the filter of the present invention; when the signal flows into the network from the port 6, the microstrip T-junction power divider 2 evenly distributes the signal energy to the step impedance microstrip lines 21 of its two arms; the step impedance microstrip line 21 couples the signal to the short-circuited coplanar waveguide gap 31 on the lower surface across it through magnetic coupling, and this process filters the signal, and the quarter wavelength corresponding to the passband center frequency is equal to the length of the open end of the step impedance microstrip line 21 and the length from the short-circuited end of the short-circuited coplanar waveguide gap 31 to the step impedance microstrip line 21. The step impedance microstrip line 21 introduces an impedance change at the intersection of the step impedance microstrip line 21 and the short-circuited coplanar waveguide gap 31, and the discontinuity of the coupling structure is compensated in situ to obtain a wider bandwidth and higher The signal in the short-circuited coplanar waveguide 3 on the lower surface reaches the multi-period artificial surface plasmon transmission line 5 after passing through the coplanar waveguide-artificial surface plasmon transition section 4 composed of the gradually opened metal part 41 and the gradually deepened metal part 42. The signal changes from the field mode of the coplanar waveguide to the artificial surface plasmon mode, realizing the mode matching between the coplanar waveguide and the artificial surface plasmon. Due to the nonlinear dispersion characteristics and cutoff characteristics of the artificial surface plasmon, the signal passing through a certain length of the multi-period artificial surface plasmon transmission line 5 is filtered and dispersed, and the amplitude-frequency response shows that the signal in the passband is transmitted at a low loss, and the signal in the stopband is greatly attenuated. The phase-frequency response shows that the signal in the passband has a nonlinear delay. The multi-period artificial surface plasmon transmission line 5 includes a plurality of cascaded artificial surface plasmon transmission line units, and different artificial surface plasmon transmission line units are composed of a plurality of metal conductor slotted structure units arranged in different periods cascaded. Figure 4 The present invention is a schematic diagram of a first metal conductor slotted structure, a second metal conductor slotted structure, and a third metal conductor slotted structure in a coplanar waveguide-artificial surface plasmon dispersion compensation filter. The multi-periodic artificial surface plasmon transmission line 5 formed by cascading a plurality of periodically arranged first metal conductor slotted structure 51 units, a plurality of periodically arranged second metal conductor slotted structure 52 units, and a plurality of periodically arranged third metal conductor slotted structures 53 has a plurality of adjustable parameters, including the depth, width, and period length of the first metal conductor slotted structure 51, the second metal conductor slotted structure 52, and the third metal conductor slotted structure 53. These parameters can be adjusted simultaneously or separately, and can adjust the overall nonlinear dispersion level in the passband and only adjust the nonlinear dispersion level of the high-frequency part in the passband, so that the present embodiment can obtain a variety of continuously adjustable nonlinear dispersion characteristic curves, thereby having the ability to compensate for a variety of dispersions and flexibly adjust the degree of dispersion compensation. The depth of the first metal conductor slot structure groove is h1, the depth of the second metal conductor slot structure groove is h2, and the depth of the third metal conductor slot structure groove is h3.

[0036] The longer the open-circuit end of the step impedance microstrip line 21 and the longer the length from the short-circuit end of the short-circuit coplanar waveguide slot 31 to the step impedance microstrip line 21 , the lower the center frequency of the filter.

[0037] In the multi-period artificial surface plasmon transmission line 5, the width or period length of the slot of the first metal conductor slot structure 51, the width or period length of the slot of the second metal conductor slot structure 52, and the width or period length of the slot of the third metal conductor slot structure 53 are increased at the same time, the group delay in the passband is increased, the phase shift curve is steeper, and the degree of nonlinearity is increased.

[0038] In the multi-period artificial surface plasmon transmission line 5, the depth of the first metal conductor slot structure 51, the depth of the second metal conductor slot structure 52, and the depth of the third metal conductor slot structure 53 are increased at the same time, the group delay of the low-frequency part in the passband remains basically unchanged, while the group delay of the high-frequency part increases, and the phase shift curve at the high-frequency position changes more steeply, which can provide a stronger degree of nonlinearity.

[0039] In the multi-period artificial surface plasmon transmission line 5, by increasing the depth of the first metal conductor slot structure 51, the depth of the second metal conductor slot structure 52, or the depth of the third metal conductor slot structure 53, the nonlinear degree of the high-frequency part in the passband can be continuously adjusted.

[0040] In the multi-period artificial surface plasmon transmission line 5, when the second metal conductor slot structure 52 and the third metal conductor slot structure 53 are the same as the first metal conductor slot structure 51, the multi-period artificial surface plasmon transmission line 5 becomes composed of only a plurality of periodically arranged first metal conductor slot structures 51. At this time, the high-frequency nonlinearity of this embodiment is the strongest.

[0041] In the multi-period artificial surface plasmon transmission line 5, when the second metal conductor slot structure 52 is the same as the first metal conductor slot structure 51 and the slot depth of the third metal conductor slot structure 53 gradually decreases, the nonlinearity of the high-frequency part in the passband of this embodiment is weakened; when the slot depth of the third metal conductor slot structure 53 is reduced to a certain extent, the nonlinearity remains basically unchanged. If it is necessary to further reduce the high-frequency nonlinearity in the passband, it is only necessary to reduce the slot depth of the second metal conductor slot structure 52.

[0042] At this time, the system signal of Example 1 has achieved filtering and multiple dispersion compensation, that is, the coplanar waveguide-artificial surface plasmon dispersion compensation filter has the ability to restore the original relationship between the phase velocities of different frequencies of the signal while filtering, reduce phase shift and waveform distortion, and improve signal integrity.

[0043] Figure 5The group delay simulation results are given when the first metal conductor slot structure 51, the second metal conductor slot structure 52, and the third metal conductor slot structure 53 are the same in Example 1 of the present invention. The results show that the dispersion compensation filter exhibits a monotonic group delay characteristic at the designed frequency, has the ability to compensate for dispersion, reduce signal phase shift distortion, and improve signal integrity.

[0044] Figure 6 The simulation results of the S parameters when the first metal conductor slot structure 51, the second metal conductor slot structure 52, and the third metal conductor slot structure 53 are the same in Embodiment 1 of the present invention are given. The results show that the dispersion compensation filter has a passband of 2.2 GHz to 5.5 GHz, a stopband of DC to 1 GHz and greater than 6.1 GHz, and a transition band of 1 GHz to 2.2 GHz and 5.5 GHz to 6.1 GHz, and can achieve a bandpass filtering function.

[0045] Figure 7 The simulation results of the high-frequency group delay in the passband are given when the depth h3 of the slotted structure of the third metal conductor is changed alone, and the depth h2 of the slotted structure of the second metal conductor is changed alone in Example 1 of the present invention. The results show that when h3 is reduced alone, the group delay of the high-frequency part is reduced, but after h3 is reduced to a certain extent, the group delay no longer decreases. At this time, reducing h2 further can make the group delay of the high-frequency part continue to decrease, that is, the dispersion compensation filter can realize a variety of continuously adjustable group delay curves in the high-frequency part of the passband, and has the ability of flexible and adjustable dispersion compensation.

[0046] The performance of the dispersion compensation filter of this embodiment is simulated in full-wave simulation software to verify the correctness of the design of the present invention; the dispersion compensation filter has the ability to perform multiple dispersion compensation on the signal while filtering, reduce signal phase shift distortion, and improve signal integrity.

[0047] Embodiment 2: This embodiment 2 is based on embodiment 1, and the multi-period artificial surface plasmon transmission line 5 is replaced by a multi-period artificial surface plasmon transmission line 7 loaded with a light-controlled PIN switch diode, and other structures remain unchanged, as shown in the attached Figure 8 The multi-period artificial surface plasmon transmission line 7 loaded with light-controlled PIN switch diodes is composed of a plurality of periodically arranged first metal conductor slotted structures 51 loaded with first light-controlled PIN switch diodes 71, a plurality of periodically arranged second metal conductor slotted structures 52 loaded with second light-controlled PIN switch diodes 72, and a plurality of periodically arranged third metal conductor slotted structures 53 loaded with third light-controlled PIN switch diodes 73, which are cascaded, as shown in the attached figure. Fig. 9Since the on-off of the optically controlled PIN switch diode can change the current path of the metal conductor slot structure, its on-off can change the nonlinear dispersion characteristics of the artificial surface plasmon, so that the embodiment can reconfigure the dispersion nonlinear characteristics in the passband through optical control.

[0048] Since the wavelength or intensity of light when the first light-controlled PIN switch diode 71, the second light-controlled PIN switch diode 72 and the third light-controlled PIN switch diode 73 are turned on is different, by controlling the wavelength or intensity of light irradiated to this embodiment, the first light-controlled PIN switch diode 71, the second light-controlled PIN switch diode 72, or the third light-controlled PIN switch diode 73 can be turned on individually; the first light-controlled PIN switch diode 71 and the second light-controlled PIN switch diode 72 can also be turned on at the same time, or the second light-controlled PIN switch diode 72 and the third light-controlled PIN switch diode 73 can be turned on at the same time.

[0049] In the multi-period artificial surface plasmon transmission line 7 loaded with light-controlled PIN switch diodes, when the first light-controlled PIN switch diode 71 is turned on alone, the second light-controlled PIN switch diode 72 is turned on alone, or the third light-controlled PIN switch diode 73 is turned on alone, the group delay in the passband of this embodiment is reduced, the phase shift curve becomes slower, and the degree of nonlinearity is weakened.

[0050] In the multi-period artificial surface plasmon transmission line 7 loaded with light-controlled PIN switch diodes, when the first light-controlled PIN switch diode 71 and the second light-controlled PIN switch diode 72 are turned on at the same time, or the second light-controlled PIN switch diode 72 and the third light-controlled PIN switch diode 73 are turned on at the same time, the group delay in the passband of this embodiment is reduced more, the phase shift curve is gentler, and the degree of nonlinearity is weaker.

[0051] In Example 2, by turning on the optically controlled PIN switch diodes simultaneously or individually, the dispersion nonlinear characteristics in the passband can be reconstructed, so that the system signal can be filtered and multiple dispersion compensations can be achieved. That is, the coplanar waveguide-artificial surface plasmon dispersion compensation filter can compensate for the phase and waveform distortion of the signal generated by other components of the system while filtering, thereby ensuring the signal integrity of the system.

[0052] The coplanar waveguide-artificial surface plasmon dispersion compensation filter can be manufactured by a planar printed circuit board (PCB) process, a thin film process, a LTCC process, etc. The larger the dielectric constant of the dielectric substrate 1, the greater the dispersion compensation capability can be at the same size. In Examples 1 and 2, a plate with a relative dielectric constant of 6.4 and a thickness of 1.524 mm is used.

[0053] According to the above description, the present invention can be realized.

[0054] The above descriptions are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. within the design methods and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coplanar waveguide-artificial surface plasmon dispersion compensation filter, characterized in that The filter comprises a dielectric substrate (1), a microstrip T-junction power divider (2), a short-circuit coplanar waveguide (3), a coplanar waveguide-artificial surface plasmon transition section (4), a multi-period artificial surface plasmon transmission line (5) and a port (6); the conduction band of the microstrip T-junction power divider (2) is located on the upper surface of the dielectric substrate (1), the short-circuit coplanar waveguide (3), the coplanar waveguide-artificial surface plasmon transition section (4) and the multi-period artificial surface plasmon transmission line (5) are located on the lower surface of the dielectric substrate (1); the structure of the filter is relatively The two sides of the line are symmetrically arranged; on the upper surface, a microstrip T-junction power divider (2) is located at the external termination port (6) of the filter, and both arms at the inner end of the microstrip T-junction power divider (2) are composed of step impedance microstrip lines (21); on the lower surface, a multi-period artificial surface plasmon transmission line (5) is located in the middle of the filter, and both ends of the multi-period artificial surface plasmon transmission line (5) are respectively connected to the coplanar waveguide-artificial surface plasmon transition section (4), and the other end of the coplanar waveguide-artificial surface plasmon transition section (4) is connected to the short-circuit coplanar waveguide (3).

2. A coplanar waveguide-artificial surface plasmon dispersion compensation filter according to claim 1, characterized in that The coplanar waveguide-artificial surface plasmon transition section (4) comprises a gradually expanding metal portion (41) and a gradually deepening metal portion (42); the gradually deepening metal portion (42) is located on the midline of the filter in the length direction, is internally terminated with a multi-period artificial surface plasmon transmission line (5), and is externally terminated with a metal conductor of a short-circuited coplanar waveguide (3); and has two gradually expanding metal portions (41), which are respectively located on both sides of the gradually deepening metal portion (42).

3. A coplanar waveguide-artificial surface plasmon dispersion compensation filter according to claim 1 or 2, characterized in that The short-circuit coplanar waveguide (3) comprises a short-circuit coplanar waveguide gap (31), and the short-circuit coplanar waveguide gap (31) is located between the metal portion (41) that gradually opens and the metal portion (42) that gradually deepens in groove depth connected to the outer end.

4. The coplanar waveguide-artificial surface plasmon dispersion compensation filter according to claim 3, characterized in that The step impedance microstrip line (21) is located at the inner end of the microstrip T-junction power divider (2), spanning the short-circuited coplanar waveguide slot (31) to the gradually opened metal portion (41); the longer the length of the open-circuited end of the step impedance microstrip line (21) and the longer the length from the short-circuited end of the short-circuited coplanar waveguide slot (31) to the step impedance microstrip line (21), the lower the center frequency of the filter.

5. The coplanar waveguide-artificial surface plasmon dispersion compensation filter according to claim 1, characterized in that The multi-periodic artificial surface plasmon transmission line (5) comprises a plurality of cascaded artificial surface plasmon transmission line units, wherein a plurality of periodically arranged first metal conductor slotted structures (51), a plurality of periodically arranged second metal conductor slotted structures (52) and a plurality of periodically arranged third metal conductor slotted structures (53) are cascaded; the first metal conductor slotted structures (51) and the third metal conductor slotted structures (53) are internally terminated with the second metal conductor slotted structures (52) and externally terminated with metal parts (42) with gradually deepening slot depths.

6. The coplanar waveguide-artificial surface plasmon dispersion compensation filter according to claim 5, characterized in that In the multi-period artificial surface plasmon transmission line (5), the width or period length of the slots of the first metal conductor slot structure (51), the width or period length of the slots of the second metal conductor slot structure (52), and the width or period length of the slots of the third metal conductor slot structure (53) are increased simultaneously, thereby increasing the degree of dispersion nonlinearity in the entire passband.

7. The coplanar waveguide-artificial surface plasmon dispersion compensation filter according to claim 5, characterized in that When the depths of the first metal conductor slot structure (51), the second metal conductor slot structure (52), and the third metal conductor slot structure (53) are increased individually, the degree of dispersion nonlinearity in the high-frequency part of the passband increases.

8. The coplanar waveguide-artificial surface plasmon dispersion compensation filter according to claim 5, characterized in that The first metal conductor slot structure (51) has a first optically controlled PIN switch diode (71) loaded on both sides of the slot, the second metal conductor slot structure (52) has a second optically controlled PIN switch diode (72) loaded on both sides of the slot, and the third metal conductor slot structure (53) has a third optically controlled PIN switch diode (73) loaded on both sides of the slot. The optically controlled PIN switch diodes are turned on simultaneously or individually to reconstruct the dispersion nonlinear characteristics within the passband.

9. The coplanar waveguide-artificial surface plasmon dispersion compensation filter according to claim 1, characterized in that The dielectric substrate (1) is a plate material with a relative dielectric constant of 6.4 and a thickness of 1.524 mm.

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