CN116054771A - Reflection-free broadband filter - Google Patents
Reflection-free broadband filter Download PDFInfo
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- CN116054771A CN116054771A CN202310339968.6A CN202310339968A CN116054771A CN 116054771 A CN116054771 A CN 116054771A CN 202310339968 A CN202310339968 A CN 202310339968A CN 116054771 A CN116054771 A CN 116054771A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/06—Frequency selective two-port networks including resistors
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a reflection-free broadband filter, wherein a first resistor, an F-type LC band-stop circuit, an L-type LC circuit and a resistor are positioned at the left side of a first feed port and are sequentially connected between a ground potential and the first feed port; the pi-type LC circuit is connected between the second resistor and the first three-wire coupling line and is positioned between the first feed port and the second feed port; the first three-wire coupling line and the second three-wire coupling line are connected in series between the second feed port and the ground potential, and the first three-wire coupling line and the second three-wire coupling line are positioned on the right side of the second feed port; the first capacitor and the second capacitor are connected to the two ends of the left side of the first three-wire coupling line; the third capacitor and the fourth capacitor are connected to the junction of the outer side line of the first three-wire coupling line and the second three-wire coupling line and are connected with the grounding potential. The invention can improve the bandwidth of the non-reflection band-pass filter and can give consideration to the size, the frequency selectivity and the loss.
Description
Technical Field
The invention relates to the technical field of microwave communication, in particular to a reflection-free broadband filter.
Background
The filter is an important component for ensuring the normal operation of the wireless communication system and is mainly used for selecting corresponding frequency band signals and suppressing out-of-band spurious signals, harmonic signals and other interference signals. The microwave band-pass filter can be classified into a reflective filter and a non-reflective filter according to the processing mode of the out-of-band signal. Most of the traditional microwave filters are reflective filters, and signals in a stop band frequency range are totally reflected back to an input end due to effects of short circuit, open circuit and the like, so that the work of a front-stage device of the filter is affected, and even the device is damaged. The reflection-free filter can absorb signals with out-of-band specific frequency bands, and the ports of the filter are in a matched state, so that no impact or interference is caused to a preceding device, and the reliability and the safety of a communication system can be effectively improved. Meanwhile, the reflectionless broadband filter further increases the requirement on the bandwidth of the filter, and is used for a broadband communication system or a high-speed system. In order to meet the demand of miniaturization and integration of wireless systems, the more compact the structure of the reflection-free broadband filter is, the better.
The existing design methods of the reflection-free broadband filter are mainly three types. The first type is to add an additional power divider, a phase shifter or a directional coupler outside the band-pass filter, absorb out-of-band reflection signals through phase conversion, and achieve the effect of reflection-free filtering, but the additional added devices cause the problems of larger overall circuit size, more elements, complex circuit constitution and relatively narrow working bandwidth. The second type is based on a microstrip filter, and combines a plurality of microstrip branches and resistors to realize a reflection-free broadband filter, and the realization method is mainly divided into two types. The first method is to cascade two or more quarter-wavelength double-line coupled lines, and a quarter-wavelength stub and a series resistor are respectively added at two ends of the first quarter-wavelength double-line coupled line and the last quarter-wavelength double-line coupled line. The second method is that the half-wavelength high-impedance microstrip line is cascaded with a plurality of band-stop structures, and each band-stop structure is composed of a T-shaped structure formed by quarter-wavelength open and short circuit branches and a grounding resistor. The design method has the advantages that no additional power distribution device is needed, the size is reduced, the phase conversion bandwidth is not needed to be expanded, but a plurality of groups of branches or a plurality of groups of coupling lines are needed to enhance the filtering effect, so that the overall size is still larger, the integration is required to be further reduced, the miniaturization is realized, and the working bandwidth is required to be further improved. The third type is realized by adopting a series-parallel LC resonator and a resistor which are formed by the total elements of the whole set, the size can be greatly reduced, but the frequency selectivity is poor and the loss is large due to the quality factor problem caused by the total elements of the whole set, and meanwhile, the broadband filter response is not realized in the construction mode.
Therefore, there is a need for a novel reflectionless wideband filter that ensures adequate bandwidth, less loss, and better frequency selectivity while maintaining a small size.
Disclosure of Invention
Aiming at the problems in the related art, the invention provides a reflection-free broadband filter, which can improve the bandwidth of the reflection-free band-pass filter and can consider the size, the frequency selectivity and the loss.
The technical scheme of the invention is realized as follows:
a reflection-free broadband filter comprises an F-type LC band-stop circuit, an L-type LC circuit, a pi-type LC circuit, a first three-wire coupling line, a second three-wire coupling line, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor; the first resistor, the F-type LC band-stop circuit, the L-type LC circuit and the second resistor are positioned at the left side of the first feed port and are sequentially connected between the ground potential and the first feed port; the pi-type LC circuit is connected between the second resistor and the first three-wire coupling line and is positioned between the first feed port and the second feed port; the first three-wire coupling line and the second three-wire coupling line are connected in series between the second feed port and the ground potential, and the first three-wire coupling line and the second three-wire coupling line are positioned on the right side of the second feed port; the first capacitor and the second capacitor are connected to the two ends of the left side of the first three-wire coupling line; the third capacitor and the fourth capacitor are connected to the connection part of the first three-wire coupling line and the outer side line of the second three-wire coupling line and are connected with a grounding potential.
The F-shaped LC band-stop circuit comprises a first series inductor, a first parallel capacitor, a parallel inductor and a second parallel capacitor, wherein the first series inductor is connected with the first resistor and the L-shaped LC circuit, the first parallel capacitor is connected to one side of the first series inductor and is connected with a grounding potential, the parallel inductor is connected to the other side of the first series inductor and is opposite to the first parallel capacitor, the second parallel capacitor is connected to one side of the parallel inductor and is connected with the grounding potential, and the first series inductor, the first parallel capacitor, the second parallel inductor and the second parallel capacitor form an F-shaped structure.
The L-shaped LC circuit comprises a series inductance II and a parallel capacitance III, wherein the series inductance II is connected between the series inductance I and the resistance II, and the parallel capacitance III is connected to one side of the series inductance II and forms an L-shaped structure with the series inductance II.
The pi-type LC circuit comprises a series inductance III, a parallel capacitor IV and a parallel capacitor V, wherein the series inductance III is connected between the resistor II and the three-wire coupling line I, the parallel capacitor IV and the parallel capacitor V are respectively connected to two ends of the series inductance III, and the parallel capacitor IV and the parallel capacitor V are both connected with a ground potential and are positioned on the same side.
The first three-wire coupling line and the second three-wire coupling line are formed by three transmission lines, and the first three-wire coupling line and the second three-wire coupling line are mutually connected with the corresponding transmission lines.
One ends of the three transmission lines of the three-wire coupling line I are connected with the feed port II, and one ends of the three transmission lines of the three coupling line II are respectively connected with the grounding potential.
The three transmission lines of the first three-wire coupling line and the three transmission lines of the second three-wire coupling line are parallel and have the same gap.
Optionally, the first three-wire coupled line has an electrical length of forty-eighth wavelength. The electric length of the three-wire coupling line II is twenty-quarter wavelength.
The beneficial effects are that: the invention realizes the reflection-free broadband filter after the integral series connection by constructing the F-type LC band-stop circuit, the double absorption resistor, the L-type LC circuit and the pi-type LC circuit with the impedance adjusting function and the capacitive loading three-wire coupling line with the filtering function, has wider bandwidth and can take the size, the frequency selectivity and the loss into consideration.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a reflection-free broadband filter according to an embodiment of the present invention.
In the figure:
1. an F-type LC band-stop circuit; 101. the first inductor is connected in series; 102. a first capacitor is connected in parallel; 103. a parallel inductor; 104. a second capacitor is connected in parallel; 2. an L-type LC circuit; 201. a second series inductor; 202. a third parallel capacitor; 3. a pi-type LC circuit; 301. a third series inductor; 302. a fourth parallel capacitor; 303. a fifth parallel capacitor; 4. three-wire coupling line I; 5. three-wire coupling line II; 6. a resistor I; 7. a resistor II; 8. a first capacitor; 9. a second capacitor; 10. a third capacitor; 11. a fourth capacitor; 12. a transmission line.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
According to an embodiment of the present invention, there is provided a reflection-free broadband filter.
As shown in fig. 1, a reflection-free broadband filter according to an embodiment of the present invention includes an F-type LC band-stop circuit 1, an L-type LC circuit 2, a pi-type LC circuit 3, a three-wire coupled line one 4, a three-wire coupled line two 5, a resistor one 6, a resistor two 7, a capacitor one 8, a capacitor two 9, a capacitor three 10, and a capacitor four 11; the first resistor 6, the F-type LC band-stop circuit 1, the L-type LC circuit 2 and the second resistor 7 are positioned at the left side of the first feed port and are sequentially connected between the ground potential and the first feed port; the pi-type LC circuit 3 is connected between the second resistor 7 and the first three-wire coupling line 4, and the pi-type LC circuit 3 is positioned between the first feeding port and the second feeding port; the first three-wire coupling line 4 and the second three-wire coupling line 5 are connected in series between the second feed port and the ground potential, and the first three-wire coupling line 4 and the second three-wire coupling line 5 are positioned on the right side of the second feed port; the first capacitor 8 and the second capacitor 9 are connected to the two ends of the left side of the first three-wire coupling line 4; the third capacitor 10 and the fourth capacitor 11 are connected to the connection part of the first three-wire coupling line 4 and the outer side line of the second three-wire coupling line 5 and are connected with a grounding potential.
In one embodiment, the F-type LC band-stop circuit 1 includes a first series inductor 101, a first parallel capacitor 102, a second parallel inductor 103 and a second parallel capacitor 104, where the first series inductor 101 is connected to the first resistor 6 and the L-type LC circuit 2, the first parallel capacitor 102 is connected to one side of the first series inductor 101 and is connected to a ground potential, the second parallel inductor 103 is connected to the other side of the first series inductor 101 and is opposite to the first parallel capacitor 102, the second parallel capacitor 104 is connected to one side of the second parallel inductor 103 and is connected to the ground potential, and the first series inductor 101, the first parallel capacitor 102, the second parallel inductor 103 and the second parallel capacitor 104 form an F-type structure.
In one embodiment, the L-shaped LC circuit 2 includes a second series inductor 201 and a third parallel capacitor 202, where the second series inductor 201 is connected between the first series inductor 101 and the second resistor 7, and the third parallel capacitor 202 is connected to one side of the second series inductor 201 and forms an L-shaped structure with the second series inductor 201.
In one embodiment, the pi-type LC circuit 3 includes a third series inductor 301, a fourth parallel capacitor 302 and a fifth parallel capacitor 303, where the third series inductor 301 is connected between the second resistor 7 and the first three-wire coupling line 4, the fourth parallel capacitor 302 and the fifth parallel capacitor 303 are respectively connected to two ends of the third series inductor 301, and the fourth parallel capacitor 302 and the fifth parallel capacitor 303 are both connected to a ground potential and are located on the same side.
In one embodiment, the first three-wire coupling line 4 and the second three-wire coupling line 5 are each composed of three transmission lines 12, and the transmission lines 12 corresponding to the first three-wire coupling line 4 and the second three-wire coupling line 5 are connected to each other. One ends of three transmission lines 12 of the first three-wire coupling line 4 are connected with the second feed port, and one ends of three transmission lines 12 of the second three-wire coupling line 5 are respectively connected with a ground potential. The three transmission lines 12 of the first three-wire coupling line 4 and the three transmission lines 12 of the second three-wire coupling line 5 are parallel to each other and have the same gap. The electrical length of the three-wire coupling line one 4 is forty-eighth wavelength. The electric length of the three-wire coupling line II 5 is twenty-quarter wavelength.
When a signal is input from the first feed port, a part of the signal is output from the second feed port after passing through the pi-type LC circuit 3, the first capacitor 8, the second capacitor 9, the first three-wire coupling line 4 and the second three-wire coupling line 5, and the part of the signal corresponds to a band-pass frequency band. The other part of the signals flow to the left and right sides after passing through the first feed port, the left part of the signals are absorbed by the first resistor 6 after passing through the second resistor 7, the L-shaped LC circuit 2 and the F-shaped LC band-stop circuit 1, the right part of the signals are reflected by the integral circuit consisting of the pi-shaped LC circuit 3, the first three-wire coupling line 4 and the second three-wire coupling line 5, and the signals are absorbed by the first resistor 6 after passing through the left part of the feed port, so that the signals correspond to the out-of-band non-reflection frequency band signals.
In this working process, the whole F-type LC band-stop circuit 1 has a band-stop filtering function, and is used for suppressing in-band signals through out-of-band signals, the center frequency of the stop band is mainly controlled by the parallel inductor 103 and the parallel capacitor two 104, and the parallel capacitor one 102 and the series inductor one 101 are used for adjusting and controlling the stop band matching and the bandwidth. The L-shaped LC circuit 2 is used for adjusting the impedance of a left circuit of the feed port to enable the impedance to be in an open circuit state in a band-pass frequency band of the whole circuit and to be in a short circuit state in an out-of-band non-reflection frequency band. The pi-type LC circuit 3 is used for adjusting the impedance of the right circuit of the feed port, so that the impedance of the right circuit of the feed port is increased in the out-of-band non-reflection frequency band of the whole circuit, and the non-reflection effect of the whole structure on out-of-band signals is enhanced. The first resistor 6 is used for signal absorption of the whole out-of-band non-reflection frequency band, the second resistor 7 is used for improving signal absorption of a high-frequency part in the out-of-band non-reflection frequency band, and the non-reflection effect is improved. The first three-wire coupling line 4, the second three-wire coupling line 5, the first capacitor 8, the second capacitor 9, the third capacitor 10 and the fourth capacitor 11 form a capacitive loading three-wire coupling line with a filtering function, and the first capacitor 8, the second capacitor 9, the third capacitor 10 and the fourth capacitor 11 are used for adjusting the bandwidth and the frequency selectivity of the band-pass of the whole circuit and reducing the size of the whole circuit. Under the action of the whole circuit, the working frequency band of the reflection-free band-pass filter is wider, the frequency selectivity can be improved by the transmission zero point, and the circuit size is smaller due to the loading effect of the whole lumped element. The distribution parameters and the integrated parameter elements are combined, so that the quality factors can be considered, and proper loss can be kept.
That is, in the present invention, the F-type LC band-stop circuit 1 is composed of two parallel capacitors, a series inductor and a parallel inductor, and is located in the left circuit of the feed port one, connected in series with the ground absorption resistor, capable of allowing the reflection signal of the out-of-band specific frequency band to pass through and be absorbed by the resistor, wherein the parallel capacitor two 104 and the parallel inductor 103 are used for adjusting and controlling the center frequency of the stop band, and the parallel capacitor one 102 and the series inductor one 101 are used for adjusting and controlling the stop band matching and the bandwidth. The L-shaped LC circuit 2 consists of a parallel capacitor and a series inductor, is positioned in a left circuit of the feed port and is connected in series with the F-shaped LC band-stop circuit 1, and is used for adjusting the impedance of the left circuit of the feed port to enable the left circuit to be in an open circuit state in a band-pass frequency band and to be in a short circuit state in an out-of-band non-reflection frequency band, so that the non-reflection effect of the whole circuit in the out-of-band specific frequency band is ensured. The pi-type LC circuit 3 consists of two parallel capacitors and a series inductor, is positioned in a right circuit of the feed port and is connected with the three-wire coupling line in series, and is used for adjusting the impedance of the right circuit of the feed port, so that the impedance of the right circuit of the feed port in an out-of-band non-reflection frequency band is increased, the non-reflection effect of the whole circuit on out-of-band signals is enhanced, and the in-band impedance is kept matched. The grounding resistor of the double absorption resistor is positioned at the left side of the F-type LC band-stop circuit 1, and the series resistor is positioned at the right side of the L-type LC circuit 2 and is respectively used for signal absorption of the whole out-of-band non-reflection frequency band and signal absorption of the out-of-band high-frequency non-reflection frequency band. The total length of the two sections of three-wire coupling lines is sixteenth wavelength, and under the action of the whole circuit, the reflection-free band-pass filter with wider frequency band is obtained.
Therefore, the F-type LC band-stop circuit 1, the double-absorption resistor, the L-type LC circuit 2 and the pi-type LC circuit 3 with the impedance adjusting function and the capacitive loading three-wire coupling line with the filtering function are constructed, the whole filter is serially connected to realize the reflection-free broadband filter, the bandwidth is wider, and the size, the frequency selectivity and the loss can be considered.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. The reflection-free broadband filter is characterized by comprising an F-type LC band-stop circuit (1), an L-type LC circuit (2), a pi-type LC circuit (3), a first three-wire coupling line (4), a second three-wire coupling line (5), a first resistor (6), a second resistor (7), a first capacitor (8), a second capacitor (9), a third capacitor (10) and a fourth capacitor (11);
the first resistor (6), the F-type LC band-stop circuit (1), the L-type LC circuit (2) and the second resistor (7) are positioned on the left side of the first feed port and are sequentially connected between the ground potential and the first feed port;
the pi-type LC circuit (3) is connected between the resistor II (7) and the three-wire coupling line I (4), and the pi-type LC circuit (3) is positioned between the feed port I and the feed port II;
the first three-wire coupling line (4) and the second three-wire coupling line (5) are connected in series between the second feed port and the ground potential, and the first three-wire coupling line (4) and the second three-wire coupling line (5) are positioned on the right side of the second feed port;
the first capacitor (8) and the second capacitor (9) are connected to the two ends of the left side of the first three-wire coupling line (4); the third capacitor (10) and the fourth capacitor (11) are connected to the connection part of the first three-wire coupling line (4) and the outer side line of the second three-wire coupling line (5) and are connected with a grounding potential.
2. The reflection-free broadband filter according to claim 1, wherein the F-type LC band reject circuit (1) comprises a series inductance (101), a parallel capacitance (102), a parallel inductance (103) and a parallel capacitance (104), wherein the series inductance (101) is connected with the resistance (6) and the L-type LC circuit (2), the parallel capacitance (102) is connected to one side of the series inductance (101) and is connected with a ground potential, the parallel inductance (103) is connected to the other side of the series inductance (101) and is opposite to the parallel capacitance (102), the parallel capacitance (104) is connected to one side of the parallel inductance (103) and is connected with a ground potential, and the series inductance (101), the parallel capacitance (102), the parallel inductance (103) and the parallel capacitance (104) form an F-type structure.
3. The reflectionless broadband filter of claim 2, wherein the L-shaped LC circuit (2) comprises a series inductance two (201) and a parallel capacitance three (202), wherein the series inductance two (201) is connected between the series inductance one (101) and the resistance two (7), and the parallel capacitance three (202) is connected to one side of the series inductance two (201) and forms an L-shaped structure with the series inductance two (201).
4. A reflection-free wideband filter according to claim 3, wherein the pi-type LC circuit (3) comprises a series inductance three (301), a parallel capacitance four (302) and a parallel capacitance five (303), wherein the series inductance three (301) is connected between the resistor two (7) and the three-wire coupling line one (4), the parallel capacitance four (302) and the parallel capacitance five (303) are respectively connected to both ends of the series inductance three (301), and the parallel capacitance four (302) and the parallel capacitance five (303) are both connected to a ground potential and are located on the same side.
5. The reflectionless broadband filter of claim 4, wherein the first three-wire coupled line (4) and the second three-wire coupled line (5) are each composed of three transmission lines (12), and the first three-wire coupled line (4) and the transmission line (12) corresponding to the second three-wire coupled line (5) are connected to each other.
6. The reflectionless broadband filter according to claim 5, wherein one end of three transmission lines (12) of the three-wire coupling line one (4) is connected with the feed port two, and one end of three transmission lines (12) of the three coupling line two (5) is connected with a ground potential respectively.
7. The reflectionless broadband filter of claim 5, wherein the three transmission lines (12) of the three-wire coupled line one (4) and the three transmission lines (12) of the three coupled line two (5) are parallel to each other with the same gap.
8. The reflectionless broadband filter of claim 5, wherein the electrical length of the three-wire coupled line one (4) is forty-eighth wavelength.
9. The reflectionless broadband filter of claim 5, wherein the electrical length of the three-wire coupled line two (5) is twenty-quarter wavelength.
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| CN115275545A (en) * | 2022-08-15 | 2022-11-01 | 南通大学 | Compact absorption type filtering power divider |
| CN115863940A (en) * | 2022-12-02 | 2023-03-28 | 大连海事大学 | Broadband balanced type notch filter with differential mode reflection-free characteristic |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103117427A (en) * | 2013-02-05 | 2013-05-22 | 江苏万邦微电子有限公司 | Wideband mini low temperature co-fired ceramic balance filter |
| CN104715911A (en) * | 2015-04-03 | 2015-06-17 | 徐园园 | Micro-strip impedance transformer |
| CN110034361A (en) * | 2019-04-23 | 2019-07-19 | 安徽大学 | It is a kind of towards 5G communication miniature ultra wide band filtering function divide feeding network and its design method |
| CN111710945A (en) * | 2020-06-08 | 2020-09-25 | 南通大学 | Subminiature balanced three-wire coupling filter |
| CN114976540A (en) * | 2022-03-31 | 2022-08-30 | 南通大学 | No-reflection band-pass filter based on three-wire coupling structure |
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| CN115863940A (en) * | 2022-12-02 | 2023-03-28 | 大连海事大学 | Broadband balanced type notch filter with differential mode reflection-free characteristic |
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