CN111755787A - High-performance multimode double-broadband filter - Google Patents
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Abstract
The invention discloses a high-performance multimode double-broadband filter which comprises a dielectric substrate, a grounding layer coated on the lower surface of the dielectric substrate and a filtering layer coated on the upper surface of the dielectric substrate. The filter layer mainly comprises an input microstrip, an output microstrip and a multimode resonator; the multimode resonator is of a bilateral symmetry structure and consists of a step impedance line, 2 connecting branches, 2 open-circuit branches, 2 short-circuit branches and 3 grounding holes. The invention combines the step impedance line with the open-circuit branch and the short-circuit branch, so that the resonance mode of the integral multi-mode resonator is richer, and a plurality of pass bands are formed. The invention has the characteristics of flexible design, various structures, high flexibility and easy integration, and is suitable for being manufactured on the dielectric substrate with low loss factors.
Description
Technical Field
The invention relates to the technical field of microwave passive devices, in particular to a high-performance multimode double-broadband filter.
Background
The wireless communication is very fast in updating, and meanwhile, higher requirements are put on the performance of various microwave circuits in the microwave field, and high-performance microwave filters are paid much attention. The high-temperature superconducting filter has extremely low insertion loss, and can realize high-performance improvement such as improvement of out-of-band selectivity and balanced group delay by utilizing the diversity of the microstrip resonators, but the high-temperature superconducting filter has extremely high Q value, so that the technical limitation on the improvement of the bandwidth of the filter is realized, and meanwhile, the high-temperature superconducting filter has high production cost and extremely low working temperature, so that the production application is limited to a certain extent. The cavity filter also has a higher Q value, and is larger in size and limited to a certain extent.
Disclosure of Invention
The invention provides a high-performance multimode double-broadband filter which has the characteristics of abundant modes and strong higher harmonic suppression capability.
In order to solve the problems, the invention is realized by the following technical scheme:
a high-performance multimode double-broadband filter consists of a dielectric substrate, a grounding layer covering the lower surface of the dielectric substrate and a filter layer covering the upper surface of the dielectric substrate; the filter layer mainly comprises an input microstrip, an output microstrip and a multimode resonator; the multimode resonator is in a bilateral symmetry structure integrally and consists of a step impedance line, 2 connecting branches, 2 open-circuit branches, 2 short-circuit branches and 3 grounding holes; the step impedance line consists of a low impedance line and a high impedance line; the low impedance line and the high impedance line are both straight micro-strips extending longitudinally, and the micro-strip width of the low impedance line is larger than that of the high impedance line; the upper end of the low-impedance line is suspended, the lower end of the low-impedance line is connected with the upper end of the high-impedance line, and the lower end of the high-impedance line is connected with a grounding hole; the step impedance line is positioned in the middle of the multimode resonator, and the longitudinal central axis of the step impedance line is superposed with the longitudinal symmetric axis of the multimode resonator; each connecting branch is a transversely extending linear microstrip; the 2 connecting branches are symmetrically arranged at the left side and the right side of the step impedance line; the inner side ends of the 2 connecting branches are connected with the lower end of a low impedance line of the step impedance line; each open-circuit branch is an inverted U-shaped microstrip; the 2 open-circuit branches are symmetrically arranged at the left side and the right side of the step impedance line and are positioned above the connecting branches; the outer ends of the 2 open-circuit branches are respectively connected with the outer ends of the 2 connecting branches; the inner side ends of the 2 open-circuit branches are suspended; each short circuit branch is a U-shaped microstrip; the 2 short-circuit branches are symmetrically arranged at the left side and the right side of the step impedance line and are positioned below the connecting branches; the outer ends of the 2 short-circuit branches are respectively connected with the outer ends of the 2 connecting branches; the inner side ends of the 2 short circuit branches are respectively connected with the 1 grounding hole; the grounding hole is a metal through hole which penetrates through the dielectric substrate and is connected with the grounding layer and the filter layer; the input micro-strip and the output micro-strip are both transversely extended linear micro-strips; the inner side end of the input microstrip is connected with the outer side end of 1 connecting branch of the multimode resonator, the inner side end of the output microstrip is connected with the outer side end of the other 1 connecting branch of the multimode resonator, and the outer side ends of the input microstrip and the output microstrip are suspended.
In the scheme, the ratio of the microstrip line width of the low-impedance line to the microstrip line width of the high-impedance line is between 10 and 14.
In the above scheme, the microstrip line widths of the high-impedance lines of the 2 connection branches, the 2 open-circuit branches, the 2 short-circuit branches and the step impedance line are equal.
In the above scheme, the length of the microstrip line of the low impedance line is smaller than that of the microstrip line of the high impedance line.
In the scheme, gaps exist among the inner side ends of the 2 open-circuit branches.
In the scheme, gaps are formed between the inner side ends of the 2 short circuit branches and the high-impedance line.
In the scheme, a patch capacitor is additionally arranged between the inner side end of the input microstrip and the outer side end of 1 connecting branch of the multimode resonator, and/or a patch capacitor is additionally arranged between the inner side end of the output microstrip and the outer side end of the other 1 connecting branch of the multimode resonator.
In the above scheme, the dielectric substrate is a ceramic dielectric substrate.
Compared with the prior art, the invention has the following characteristics:
1. the step impedance line is combined with the open-circuit branch and the short-circuit branch, so that the resonance mode of the integral multi-mode resonator is richer, and a plurality of pass bands are formed;
2. the step impedance line plays a good role in harmonic suppression, and meanwhile, the excitation source adopts a patch capacitor, so that the intensity of external excitation of the whole filter is easily adjusted, the filter can reach a wider bandwidth, and a filter with double broadband and strong harmonic suppression can be formed;
3. the dielectric substrate has the characteristics of flexible design, various structures, high flexibility and easiness in integration, and is suitable for being manufactured on a dielectric substrate with low loss factors.
Drawings
Fig. 1 is a schematic structural diagram of a high-performance multimode dual-broadband filter.
Fig. 2 is an equivalent circuit diagram of a multimode resonator.
Fig. 3 is an equivalent circuit diagram of the even mode portion of the multimode resonator.
Fig. 4 is an equivalent circuit diagram of the odd mode part of the multimode resonator.
Fig. 5 is a graph of the frequency response of a high performance multimode dual broadband filter.
Reference numbers in the figures: 1. a dielectric substrate; 2. inputting a microstrip; 3. a multimode resonator; 3-1, step impedance line; 3-1-1, low impedance line; 3-1-2, high impedance line; 3-2, open-circuit branch knots; 3-3, short circuit branch knot; 3-4, connecting branch knots; 3-5, a grounding hole; 4. outputting a microstrip; 5. and (4) a chip capacitor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings in conjunction with specific examples. It should be noted that directional terms such as "upper", "lower", "middle", "left", "right", "front", "rear", and the like, referred to in the examples, refer only to the direction of the drawings. Accordingly, the directions used are for illustration only and are not intended to limit the scope of the present invention.
A high-performance multimode double-broadband filter is composed of a dielectric substrate 1, a grounding layer and a filter layer. The grounding layer and the filter layer are both metal layers, wherein the grounding layer covers the lower surface of the dielectric substrate 1, and the filter layer covers the upper surface of the dielectric substrate 1. In this embodiment, the dielectric substrate 1 is a ceramic dielectric substrate 1, and has a dielectric constant of 3.55, and a thickness of 0.508mm for the dielectric substrate 1. The ground layer is a complete copper-clad layer covering the entire lower surface of the dielectric substrate 1. The filter layer is a pattern etched from a copper foil material coated on the upper surface of the dielectric substrate 1.
The filter layer is mainly composed of an input microstrip 2, an output microstrip 4 and a multimode resonator 3, as shown in fig. 1. The multimode resonator 3 is in a bilateral symmetry structure as a whole, namely the whole is symmetrical about a longitudinal axis, and consists of a step impedance line 3-1, 2 connecting branches 3-4, 2 open-circuit branches 3-2, 2 short-circuit branches 3-3 and 3 grounding holes 3-5. The stepped impedance line 3-1 is composed of a low-step impedance line 3-1-1 and a high-step impedance line 3-1-2. The length of the microstrip line of the low-jump impedance line 3-1-1 is smaller than that of the microstrip line of the high-jump impedance line 3-1-2. The low jump impedance line 3-1-1 and the high jump impedance line 3-1-2 are both longitudinally extending straight micro-strips, and the micro-strip line width of the low jump impedance line 3-1-1 is larger than that of the high jump impedance line 3-1-2. The upper end of the low jump impedance line 3-1-1 is suspended, the lower end of the low jump impedance line 3-1-1 is connected with the upper end of the high jump impedance line 3-1-2, and the lower end of the high jump impedance line 3-1-2 is connected with a grounding hole 3-5. The step impedance line 3-1 is positioned in the middle of the multimode resonator 3, and the longitudinal central axis of the step impedance line 3-1 is superposed with the longitudinal symmetry axis of the multimode resonator 3. Each connecting branch 3-4 is a transversely extending linear microstrip. The 2 connecting branches 3-4 are symmetrically arranged at the left side and the right side of the step impedance line 3-1, and the inner side end of the connecting branch 3-4 is connected with the lower end of the low step impedance line 3-1-1 of the step impedance line 3-1. Each open-circuit branch 3-2 is an inverted U-shaped microstrip. The 2 open-circuit branches 3-2 are symmetrically arranged at the left side and the right side of the step impedance line 3-1 and are positioned above the connecting branches 3-4, and a certain gap is formed between the two branches. The outer ends of the 2 open-circuit branches 3-2 are respectively connected with the outer ends of the 2 connecting branches 3-4; the inner side ends of the 2 open-circuit branches 3-2 are suspended. Each short-circuit branch 3-3 is a U-shaped microstrip. The 2 short-circuit branches 3-3 are symmetrically arranged at the left side and the right side of the step impedance line 3-1 and are positioned below the connecting branches 3-4, and a certain gap is formed between the two branches. The outer side ends of the 2 short-circuit branches 3-3 are respectively connected with the outer side ends of the 2 connecting branches 3-4; the inner side ends of the 2 short circuit branches 3-3 are respectively connected with the 1 grounding hole 3-5. The grounding holes 3-5 are metal through holes which penetrate through the dielectric substrate 1 and are connected with the grounding layer and the filter layer. In this embodiment, the grounding hole 3-5 is 0.3mm in diameter. The input microstrip 2 and the output microstrip 4 are both transversely extending straight-line-shaped microstrips. The microstrip line width and the microstrip length of the input microstrip 2 and the output microstrip 4 are equal. The inner side end of the input micro-strip 2 is connected with the outer side ends of 1 connecting branch 3-4 of the multi-mode resonator 3, the inner side end of the output micro-strip 4 is connected with the outer side ends of the other 1 connecting branches 3-4 of the multi-mode resonator 3, and the outer side ends of the input micro-strip 2 and the output micro-strip 4 are suspended so as to facilitate later welding and performance testing.
In order to adjust the intensity of the external excitation signal conveniently, a patch capacitor 5 is additionally arranged between the inner side end of the input micro-strip 2 and the outer side end of 1 connecting branch 3-4 of the multi-mode resonator 3 and/or a patch capacitor 5 is additionally arranged between the inner side end of the output micro-strip 4 and the outer side end of the other 1 connecting branch 3-4 of the multi-mode resonator 3. When strong excitation is needed outside, the intensity of an external excitation signal can be conveniently adjusted by using the patch capacitor 5, so that a proper bandwidth can be very conveniently selected, and convenience is brought to improvement of an external Q value. The patch capacitor 5 does not take up additional space and material compared to parallel coupled lines. In this embodiment, the capacitance values and the packages of the 2 patch capacitors 5 are all identical.
For the whole multimode resonator 3, only microstrip lines of two widths are used for the whole multimode resonator 3, wherein the microstrip line widths of the high impedance line 3-1-2 of the 2 connecting branches 3-4, the 2 open-circuit branches 3-2, the 2 short-circuit branches 3-3 and the stepped impedance line 3-1 are equal, that is, W1-W2-W3-W5; the microstrip line width of the low jump impedance line 3-1-1 is larger than that of the high jump impedance line 3-1-2, namely W4 is larger than W5, so that the filter can obtain better harmonic suppression effect. The invention can select proper center frequency by adjusting the physical length of the step impedance line 3-1, and can realize harmonic suppression by adjusting the microstrip line width ratio of the low-step impedance line 3-1-1 and the high-step impedance line 3-1-2 of the step impedance line 3-1. Since the impedance of the microstrip is inversely proportional to the line width, the impedance ratio of the low-jump impedance line 3-1-1 to the high-jump impedance line 3-1-2 can be determined based on the line width of each of the low-jump impedance line 3-1-1 and the high-jump impedance line 3-1-2. In the invention, the ratio of the microstrip line width of the low-jump impedance line 3-1-1 to the microstrip line width of the high-jump impedance line 3-1-2 is between 10 and 14.
After the open-circuit branch 3-2 and the short-circuit branch 3-3 are respectively loaded on the upper part and the lower part of the multimode resonator 3, the resonance mode of the whole resonator becomes rich, which is beneficial to forming a dual-passband, and the electrical lengths of the open-circuit branch 3-2 and the short-circuit branch 3-3 can be used for adjusting the position of each mode on a frequency axis so as to realize the control of the resonance mode. The open-circuit branches 3-2 are mainly distributed on the upper half part of the multimode resonator 3, the coupling between the open-circuit branches 3-2 can realize indirect coupling between an excitation source and a load, the coupling can enable the outside of a filter to generate a plurality of zero points, the transmission zero points near the pass bands can be adjusted properly to improve the selectivity of the filter, the transmission zero points between the two pass bands can be used for improving the isolation between the pass bands, and the harmonic suppression depth of the filter can be improved when the frequency is higher than that of the transmission zero points of the second pass band. Gaps are formed among the inner side ends of the 2 open-circuit branches 3-2, so that indirect coupling between the excitation source and the load is formed, the strength of the indirect coupling between the excitation source and the load is changed by adjusting the coupling gaps among the 2 open-circuit branches 3-2 above, and the positions of transmission zero points are changed, so that the purpose of indirectly controlling the transmission zero points is achieved. Gaps are reserved between the inner side ends of the 2 short circuit branches 3-3 and the high-jump impedance line 3-1-2, so that interference coupling between the short circuit branches 3-3 on two sides can be effectively avoided. 2 open circuit branches 3-2 and 2 short circuit branches 3-3 are bent inwards, and most space and materials can be saved.
The multimode resonator 3 can be divided into an odd-mode part and an even-mode part according to an odd-mode and even-mode analysis method, wherein 1 connecting branch 3-4, 1 open-circuit branch 3-2 and 1 short-circuit branch 3-3 form the odd-mode part of the multimode resonator 3; the even mode part of the multimode resonator 3 is formed by the 1 connecting branch 3-4, the 1 open-circuit branch 3-2, the 1 short-circuit branch 3-3 and the half of the stepped impedance line 3-1 which is separated from the longitudinal central axis of the stepped impedance line. Fig. 2 is an equivalent circuit diagram of the multimode resonator 3. Fig. 3 is an equivalent circuit diagram of the even mode part of the multimode resonator 3. Fig. 4 is an effective circuit diagram of the odd mode portion of the multimode resonator 3. The odd mode part can generate 2 resonant modes fo1 and fo2, the even mode part can generate three resonant modes fe1, fe2 and fe3, the resonant modes are fe1, fo1, fe2, fo2 and fe3 in sequence from small to large in frequency, wherein fe1 and fo1 form a first pass band, fe2, fo2 and fe3 form a second pass band, the electrical lengths of corresponding branches are properly adjusted to enable the corresponding branches to respectively fall in the vicinity of 2.4GHz and 5.2GHz, the magnitude of the capacitance value of an external excitation capacitor is properly adjusted to obtain a proper double-broadband filter, and simultaneously, the impedance ratio of a stepped impedance line 3-1 is adjusted to select a point with the best harmonic frequency suppression capability, so that the whole structure of the double-broadband filter is established.
One specific example of the present invention is given below: the microstrip multimode resonator 3 comprises 2 open-circuit branches 3-2 and 2 short-circuit branches 3-3, the stepped impedance line 3-1 is located at the center, the specific structure size is W1-0.15 mm, L1-13.85 mm, W2-0.15 mm, L2-11.35 mm, W3-0.15 mm, L3-3.1 mm, W4-1.475 mm, L4-5.18 mm, W5-0.15 mm, L5-3.875 mm, the diameter of the grounding hole 3-5 is 0.3mm, the length of the feeder lines on both sides is 6mm, the multimode width of the whole filter is 22.825mm, the height is 30mm, and the occupied area of the microstrip line is much smaller than that of a half-wavelength cascaded filter of the same medium and the same size. The width We of the input microstrip 2 and the output microstrip 4 is 1.15mm, and the length We of the input microstrip 2 and the output microstrip 4 has little influence on the performance of the whole filter, and is taken as Le being 6 mm. The result simulation diagram of the high-performance multimode double-broadband filter is shown in fig. 5, on one hand, the high-performance multimode double-broadband filter can play an obvious role in inhibiting higher harmonic frequencies outside a second passband, and is favorable for improving the quality of signals; on the other hand, five transmission zeros are generated outside the band, the transmission zeros between the pass bands improve the isolation between the double pass bands, the other transmission zeros improve the suppression depth of the wide stop band, and the integral multi-mode filter shows a wide bandwidth and excellent performance.
It should be noted that, although the above-mentioned embodiments of the present invention are illustrative, the present invention is not limited thereto, and thus the present invention is not limited to the above-mentioned embodiments. Other embodiments, which can be made by those skilled in the art in light of the teachings of the present invention, are considered to be within the scope of the present invention without departing from its principles.
Claims (8)
1. A high-performance multimode double-broadband filter consists of a dielectric substrate (1), a grounding layer covering the lower surface of the dielectric substrate (1) and a filtering layer covering the upper surface of the dielectric substrate (1); the filter layer is characterized by mainly comprising an input microstrip (2), an output microstrip (4) and a multimode resonator (3);
the multimode resonator (3) is integrally in a bilateral symmetry structure and consists of a step impedance line (3-1), 2 connecting branches (3-4), 2 open-circuit branches (3-2), 2 short-circuit branches (3-3) and 3 grounding holes (3-5);
the step impedance line (3-1) consists of a low-jump impedance line (3-1-1) and a high-jump impedance line (3-1-2); the low jump impedance line (3-1-1) and the high jump impedance line (3-1-2) are both straight micro-strips extending longitudinally, and the micro-strip line width of the low jump impedance line (3-1-1) is larger than that of the high jump impedance line (3-1-2); the upper end of the low jump impedance line (3-1-1) is suspended, the lower end of the low jump impedance line (3-1-1) is connected with the upper end of the high jump impedance line (3-1-2), and the lower end of the high jump impedance line (3-1-2) is connected with a grounding hole (3-5); the step impedance line (3-1) is positioned in the middle of the multimode resonator (3), and the longitudinal central axis of the step impedance line (3-1) is superposed with the longitudinal symmetry axis of the multimode resonator (3);
each connecting branch (3-4) is a transversely extending linear microstrip; the 2 connecting branches (3-4) are symmetrically arranged at the left side and the right side of the step impedance line (3-1); the inner side ends of the 2 connecting branches (3-4) are connected with the lower end of the low-jump impedance line (3-1-1) of the step impedance line (3-1);
each open-circuit branch (3-2) is an inverted U-shaped microstrip; the 2 open-circuit branches (3-2) are symmetrically arranged at the left side and the right side of the step impedance line (3-1) and are positioned above the connecting branches (3-4); the outer ends of the 2 open-circuit branches (3-2) are respectively connected with the outer ends of the 2 connecting branches (3-4); the inner side ends of the 2 open-circuit branches (3-2) are suspended;
each short-circuit branch (3-3) is a U-shaped microstrip; the 2 short-circuit branches (3-3) are symmetrically arranged at the left side and the right side of the step impedance line (3-1) and are positioned below the connecting branches (3-4); the outer side ends of the 2 short-circuit branches (3-3) are respectively connected with the outer side ends of the 2 connecting branches (3-4); the inner side ends of the 2 short circuit branches (3-3) are respectively connected with the 1 grounding hole (3-5);
the grounding hole (3-5) is a metal through hole which penetrates through the dielectric substrate (1) and is connected with the grounding layer and the filter layer;
the input micro-strip (2) and the output micro-strip (4) are both transversely extended linear micro-strips; the inner side end of the input micro-strip (2) is connected with the outer side ends of 1 connecting branch (3-4) of the multi-mode resonator (3), the inner side end of the output micro-strip (4) is connected with the outer side ends of the other 1 connecting branches (3-4) of the multi-mode resonator (3), and the outer side ends of the input micro-strip (2) and the output micro-strip (4) are suspended.
2. A high performance multimode double broadband filter according to claim 1, wherein the ratio of the microstrip line width of the low jump impedance line (3-1-1) to the microstrip line width of the high jump impedance line (3-1-2) is between 10 and 14.
3. A high-performance multimode double broadband filter according to claim 1 or 2, characterized in that the high-jump impedance line (3-1-2) of the 2 connection branches (3-4), the 2 open-circuit branches (3-2), the 2 short-circuit branches (3-3) and the step impedance line (3-1) has the same microstrip line width.
4. A high performance multimode double broadband filter according to claim 1, characterized in that the microstrip line length of the low-jump impedance line (3-1-1) is smaller than the microstrip line length of the high-jump impedance line (3-1-2).
5. A high performance multimode double broadband filter according to claim 1, characterized in that there are gaps between the inner ends of the 2 open branches (3-2).
6. A high performance multimode double broadband filter according to claim 1, characterized in that there is a gap between the inner ends of the 2 short-circuited stubs (3-3) and the high-jump-impedance line (3-1-2).
7. A high-performance multimode double broadband filter according to claim 1, characterized in that a patch capacitor (5) is added between the inner end of the input microstrip (2) and the outer end of 1 connecting stub (3-4) of the multimode resonator (3) and/or a patch capacitor (5) is added between the inner end of the output microstrip (4) and the outer end of the other 1 connecting stub (3-4) of the multimode resonator (3).
8. A high performance multimode double broadband filter according to claim 1, characterized in that the dielectric substrate (1) is a ceramic dielectric substrate (1).
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| CN112103610A (en) * | 2020-10-22 | 2020-12-18 | 南通大学 | Balanced multimode band-pass filter |
| CN112103610B (en) * | 2020-10-22 | 2022-02-22 | 南通大学 | Balanced multimode band-pass filter |
| CN113193316A (en) * | 2021-04-30 | 2021-07-30 | 南通大学 | Non-reflection band-pass filter based on double-sided parallel strip lines |
| CN113193316B (en) * | 2021-04-30 | 2021-10-29 | 南通大学 | Non-reflection band-pass filter based on double-sided parallel strip lines |
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