CN106788313B - Feed circuit of filter and device based on feed circuit - Google Patents
Feed circuit of filter and device based on feed circuit Download PDFInfo
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- CN106788313B CN106788313B CN201710109140.6A CN201710109140A CN106788313B CN 106788313 B CN106788313 B CN 106788313B CN 201710109140 A CN201710109140 A CN 201710109140A CN 106788313 B CN106788313 B CN 106788313B
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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
- H03H7/52—One-way transmission networks, i.e. unilines
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Abstract
The embodiment of the application provides a feed circuit of a filter and a device based on the feed circuit, wherein the feed circuit comprises an input port, a first transmission line with one end connected with the input port and the other end grounded, one end is connected with the first transmission line, the other end is grounded, the second transmission line and the capacitor are connected with the first transmission line and/or the second transmission line, and the first transmission line and/or the second transmission line are/is connected with the resonator through the capacitor and are used for supplying power to the resonator. The feeding circuit provided by the embodiment of the application uses the metal line with the end grounded as the transmission line, and transmits the low-frequency signal to the ground through the grounding while transmitting the signal to the resonator, namely, the grounding inductance is introduced into the feeding circuit, so that the filter comprising the feeding circuit can generate a transmission zero point at the low end of the passband, and the rectangle degree of the low end of the filter and the out-of-band rejection capability of the low end of the filter are effectively improved.
Description
Technical Field
The application relates to the technical field of radio frequency microwave communication and radar, and more particularly to a power supply circuit for a filter and an apparatus based on the same.
Background
The filter can effectively filter the frequency points of the specific frequency or the frequencies outside the frequency points to obtain a signal of the specific frequency, or eliminate a signal of the specific frequency, and the filter mainly plays a role in frequency control, namely, suppresses noise outside the frequency band, eliminates useless signals to reduce interference of the useless signals on useful signals.
With the rapid development of communication technology, various microwave/radio frequency devices are increasingly used, and in the transmission process of microwave system information, a filter is used as a device for generating high-quality communication signals by inhibiting specific frequency signals, the characteristics of the filter have a large influence on the whole microwave system, and the feed circuit of the filter is used as a component part of the filter, so that the influence on the performance of the filter is not negligible.
Disclosure of Invention
The embodiment of the application provides a feed circuit of a filter and a device based on the feed circuit, wherein the feed circuit effectively improves the suppression capability of the low end of a pass band of the filter while transmitting energy to a resonator, and a high-pass band-pass filter adopting the feed circuit improves the out-of-band suppression capability of the low end, so that a switch filter component based on the high-pass band-pass filter and a switch integrated signal preselector correspondingly improve the rectangular degree of the low end.
To achieve the above objective, an embodiment of the present application provides a power supply circuit of a filter, which includes an input port, a first transmission line having one end connected to the input port and the other end grounded, a second transmission line having one end connected to the first transmission line and the other end grounded, and a capacitor, wherein the first transmission line and/or the second transmission line are connected to the capacitor, and are used for connecting the resonator through the capacitor and supplying power to the resonator.
Optionally, the first transmission line is grounded through a first via, and the second transmission line is grounded through a second via.
Optionally, the shape of the first transmission line and/or the second transmission line is spiral.
Optionally, one end of the connection input port of the first transmission line is bent upwards or downwards and then connected with the first via hole.
Optionally, the grounded end of the first transmission line is bent upward or downward and then connected to the first via hole.
Optionally, the second transmission line has a bend between an end connected to the first transmission line and the ground.
The embodiment of the application also provides a high-pass band-pass filter based on the feed circuit, which comprises the feed circuit and at least two resonators, wherein the feed circuit is connected with the resonators and is used for supplying power to the resonators, and the resonators are used for filtering.
The embodiment of the application also provides a switch filter assembly, which comprises a filter bank consisting of at least two high-pass band-pass filters, an input radio frequency interface, an output radio frequency interface, an input radio frequency switch, an output radio frequency switch and a switch control module; the input end of the input radio frequency switch is connected with the output end of the input radio frequency interface, the output end of the input radio frequency switch is connected with the filter bank, one end of the output radio frequency switch is connected with the filter bank, and the other end of the output radio frequency switch is connected with the output radio frequency interface. The switch control module is connected with the input radio frequency switch and the output radio frequency switch and is used for switching the switch to select the filtered frequency band.
The embodiment of the application also provides a switch integrated signal preselector which comprises a filter bank consisting of at least two high-pass band-pass filters, an input end, an output end, a low-noise amplifier module, an attenuator bank consisting of at least two attenuators and a control module; one end of the low noise amplifier module is connected with the input end, and the other end of the low noise amplifier module is connected with the attenuator group; one end of the attenuator group is connected with the low noise amplifier module, and the other end of the attenuator group is connected with the filter group and is used for selecting an attenuation passage; one end of the filter bank is connected with the attenuator bank, and the other end of the filter bank is connected with the output end and is used for selecting a filtered frequency band; the control module is connected with the low-noise amplifier module, the attenuator group and the filter group and used for controlling the filter switch.
Optionally, the low noise amplifier module includes a pass-through path and a low noise amplification path, the pass-through path and the low noise amplification path being selected by a one-to-two switch.
In summary, the feeding circuit provided by the embodiment of the application utilizes the metal line with the end grounded, and transmits a part of signals to the ground while transmitting the signals to the resonator, namely, the grounding inductance is introduced into the feeding circuit, so that a filter comprising the feeding circuit can generate a transmission zero at the low end of a passband, and a switch filter component comprising the filter and a switch integrated signal preselector can generate a transmission zero at the low end, thereby effectively improving the rectangle degree and the out-of-band rejection capability of the device based on the feeding circuit provided by the embodiment of the application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit diagram of a feed circuit provided in an embodiment of the present application;
FIG. 2A is a schematic diagram of a feed circuit according to an embodiment of the present application;
fig. 2B is a perspective view of a feeding circuit corresponding to fig. 1 according to an embodiment of the present application;
FIG. 3A is a schematic diagram of a feed circuit according to an embodiment of the present application;
fig. 3B is a perspective view of a feeding circuit corresponding to fig. 1 according to an embodiment of the present application;
FIG. 4A is a schematic diagram of a feed circuit according to an embodiment of the present application;
fig. 4B is a perspective view of a feeding circuit corresponding to fig. 1 according to an embodiment of the present application;
FIG. 5A is a schematic diagram of a feed circuit according to an embodiment of the present application;
fig. 5B is a perspective view of a feeding circuit corresponding to fig. 1 according to an embodiment of the present application;
fig. 6 is a circuit diagram of a filter according to an embodiment of the present application;
fig. 7A is a plan view of a filter according to an embodiment of the present application;
fig. 7B is a perspective view of a filter according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a switch filter assembly according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a switch integrated signal pre-selector according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application 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 application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The existing filter feed circuit generally adopts a tap wire mode to directly feed signals into a resonator, and the filter adopting the structure has the defects of low rectangle degree, poor out-of-band suppression effect and the like. IN order to improve the rectangular degree of the filter, the application provides a feed circuit of the filter, the circuit diagram of which is shown IN fig. 1, which comprises an input port IN, a first transmission line 1 with one end connected with the input port IN and the other end grounded, a second transmission line 5 with one end connected with the first transmission line 1 and the other end grounded, and a capacitor, wherein the feed circuit is connected with a resonator of the filter through the capacitor and transmits energy to the resonator. Alternatively, the first transmission line may be grounded through the first via, and the second transmission line may be grounded through the second via.
The corresponding structure diagram of the feed circuit is shown in fig. 2A and 2B, and the feed circuit comprises a transmission line 2, wherein the transmission line 2 is a transmission line for connecting an input port and a first transmission line, and 1 and 5 are a first transmission line and a second transmission line, a first via hole 6, a second via hole 7 and a capacitor 3 respectively. Since the first transmission line 1 and the second transmission line 5 are grounded, they are functionally equivalent to inductive elements, i.e. filter low frequency signals and thus pass high frequency signals, the transmission line 2 is connected to both the first transmission line 1 and the second transmission line 5, the first transmission line 1 is grounded via a first via 6 and the second transmission line 5 is grounded via a second via 7, and the second transmission line 5 is connected to the resonator of the filter via a capacitor 3. After the signal is fed in by the transmission line 2, the low-frequency signal is transmitted to the ground through the first transmission line 1 and the second transmission line 5 respectively through the first via hole 6 and the second via hole 7, the high-frequency signal is transmitted to the resonator 4 through the capacitor 3, and other signals are reflected back, so that the feeding function is realized, and the low-frequency signal is filtered out through the grounding of the transmission line, so that the high-frequency signal passes through.
The first transmission line 1 and the second transmission line 5 may be the same transmission line, or may be two transmission lines independent of each other, which is not particularly limited herein. Although the first transmission line in fig. 2A and 2B is connected to the input port via the transmission line 2, it is reflected in the circuit diagram that one end of the first transmission line is connected to the input port.
It should be noted that, in the above description, the second transmission line is connected to the capacitor, and in actual operation, the first transmission line may be connected to the capacitor, or both the first transmission line and the second transmission line may be connected to the capacitor.
The embodiment of the application utilizes the metal lines with the tail ends grounded, namely the first transmission line 1 and the second transmission line 5 in the figures 2A and 2B, and transmits the low-frequency signals to the ground, which is equivalent to the introduction of a grounding inductance into a feed circuit, and the feed circuit with the structure supplies power for the resonator of the filter, so that the filter can generate a transmission zero point at the low end of a passband, the out-of-band rejection capability of the filter is improved, and the rectangular degree of the low end of the filter is improved.
It should be noted that the resonator is not part of the feed circuit, and for convenience of description, the resonator is introduced in fig. 2A and 2B according to the embodiment of the present application.
In the embodiment of the present application, the first transmission line 1 and/or the second transmission line 5 may be spirally connected to the via hole, and, as shown in fig. 3A and 3B, for example, the first transmission line 1 is spirally connected to the ground through the first via hole 6, the second transmission line 5 is connected to the ground through the second via hole 7, and the second transmission line 5 is connected to the resonator 4 through the capacitor 3, after a signal is fed by the transmission line 2, a low-frequency signal is transmitted to the ground through the second transmission line 5 and the first transmission line 1 through the second via hole 7 and the first via hole 6, respectively, a high-frequency signal is transmitted to the resonator through the capacitor 3, and other signals are reflected back, thereby realizing the feeding function. Of course, the second transmission line can also be in a spiral shape and grounded through the via hole, and the transmission line is in a spiral shape, so that the longer transmission line occupies less space in the circuit, and the power supply function of the feed circuit is realized on the premise of not increasing the volume of the circuit.
Alternatively, as shown in fig. 4A and 4B, one end of the connection input port of the first transmission line 1 is bent upward for a certain distance and connected to the first via hole 6, and of course, one end of the connection input port of the first transmission line 1 may also be bent downward for a certain distance and then connected to the first via hole 6 (not shown in the drawings), and when the transmission line is longer, the volume of the circuit occupied by the transmission line can be reduced by bending.
Alternatively, as shown in fig. 5A and 5B, one end of the first transmission line 1 connected to the first via hole is bent upward by a certain distance to be connected to the second via hole 7. Of course, the end of the first transmission line 1 connected to the first via hole may be bent downward by a certain distance and then connected to the second via hole 7 (not shown in the figure), and similarly, when the transmission line is longer, the end of the first transmission line 1 connected to the first via hole is bent upward, so that the volume of the circuit occupied by the transmission line may be reduced.
Further, the second transmission line may have a bend between the end connected to the first transmission line and the end grounded, which may be an upward bend or a downward bend at the end connected to the first transmission line, or an upward bend or a downward bend at the end grounded (not shown in the figure).
Based on the same inventive concept, the embodiment of the application further provides a high-pass band-pass filter, which comprises the feed circuit and the resonator, as shown in fig. 6, which is an equivalent circuit diagram of the filter, wherein the parts marked by the dashed boxes are an input feed circuit and an output feed circuit respectively, the input feed circuit comprises an input transmission line, two grounded transmission lines and a capacitor, the output feed circuit comprises an output transmission line, two grounded transmission lines and a capacitor, and the input feed circuit and the output feed circuit are connected through the capacitor and the resonator of the filter.
In the following description, a filter including 8 resonators is taken as an example, the filter is generally divided into an upper microstrip structure, a middle dielectric substrate and a bottom metal substrate, and as shown in fig. 7A, which is a planar structure diagram of the filter, and fig. 7B, which is a three-dimensional structure diagram of the filter, it can be seen that the filter includes a feed circuit and a resonator, the resonator is composed of a resonant rod 8 and a ground hole 9, and the resonant rod 8 is disposed on a surface of the dielectric substrate and is connected to a back surface of the dielectric substrate through the ground hole 9. The signals are fed in by the transmission line of the input feed circuit, wherein the low-frequency signals are transmitted to the ground through the transmission line of the feed circuit via the via hole, the high-frequency signals are transmitted to the resonator through the capacitor of the feed circuit, other signals are reflected back, and the signals transmitted to the resonator are coupled among the resonators, so that the filtering is realized through resonance.
In the filter, after signals are fed by the input transmission line, low-frequency signals are transmitted to the ground, which is equivalent to the introduction of a grounding inductor in a feed circuit, so that a transmission zero point can be introduced at the low end of a passband in the filter, the frequency at the low end of the passband of the filter is eliminated, and the out-of-band rejection capability of the filter is improved.
Based on the high-pass band-pass filter, the embodiment of the application further provides a switch filter assembly, as shown IN fig. 8, the filter assembly comprises a filter bank formed by the high-pass band-pass filters, 4 high-pass band-pass filters F1, F2, F3 and F4 are shown IN fig. 8 to form a filter bank, an input radio frequency interface IN, an output radio frequency interface OUT, an input radio frequency switch S1, an output radio frequency switch S2 and a switch control module, wherein the input end of the S1 is connected with the output end of the input radio frequency IN, the output end of the S1 is connected with the filter bank, one end of the S2 is connected with the filter bank, the other end of the S2 is connected with the output radio frequency interface OUT, and the switch control module is connected with both the S1 and the S2 to select a frequency band to be filtered by controlling the S1 and the S2.
The filter component adopts the high-pass band-pass filter described in the embodiment of the application, so that the rectangular degree of the low end of the component and the out-of-band rejection of the low end of the component are improved, and the filtering characteristic of the multi-channel switch filter component is effectively improved.
As shown IN fig. 9, the embodiment of the present application further provides a switch integrated signal pre-selector, which includes a filter bank formed by the at least two high-pass band-pass filters, as shown IN fig. 9, four filters of the high-pass band-pass filters F1, F2, F3, F4 form a filter bank, an input end IN, an output end OUT, a low-noise amplifier module, an attenuator bank formed by at least two attenuators, and a control module, as shown IN fig. 9, an attenuator bank formed by four attenuators A1, A2, A3, A4; one end of the low noise amplifier module is connected with the input end, and the other end of the low noise amplifier module is connected with the attenuator group; one end of the attenuator group is connected with the low noise amplifier module, and the other end of the attenuator group is connected with the filter group and is used for selecting an attenuation passage; one end of the filter bank is connected with the attenuator bank, and the other end of the filter bank is connected with the output end and is used for selecting a filtered frequency band; the control module is connected with the low-noise amplifier module, the attenuator group and the filter group and used for controlling the filter switch.
The low noise amplifier module comprises a direct-pass path and a low noise amplification path, wherein the two paths are selected through a switch with one being one or two.
The preselector is applied to the transmitting and/or receiving part of the communication system, and can effectively restrain harmonic waves, image frequencies and other spurious signals generated in a channel.
In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may be physically included separately, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform part of the steps of the methods according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The feed circuit of the filter is characterized by comprising an input port, a first transmission line, a second transmission line and a capacitor, wherein one end of the first transmission line is connected with the input port, the other end of the first transmission line is grounded, one end of the second transmission line is connected with the first transmission line, the other end of the second transmission line is grounded, and the first transmission line and/or the second transmission line are/is connected with the capacitor and are/is used for connecting a resonator through the capacitor and supplying power for the resonator.
2. The feed circuit of claim 1, wherein the first transmission line is grounded through a first via and the second transmission line is grounded through a second via.
3. The feed circuit according to any one of claims 1 or 2, wherein the shape of the first transmission line and/or the second transmission line is spiral.
4. The feeder circuit of claim 2, wherein an end of the first transmission line connected to the input port is bent upward or downward and then connected to the first via.
5. The feeder circuit of claim 2, wherein the grounded end of the first transmission line is connected to the first via after being bent upward or downward.
6. A feed circuit as claimed in any one of claims 1 or 2, wherein the second transmission line has a bend between an end to which the first transmission line is connected and a ground end.
7. A high pass band pass filter comprising a feed circuit as claimed in any one of claims 1 or 2 or 4 or 5 and at least two resonators, said feed circuit being connected to said resonators for powering said resonators, said resonators being for filtering.
8. A switched filter assembly comprising a filter bank of at least two high pass band pass filters as claimed in claim 7, an input radio frequency interface, an output radio frequency interface, an input radio frequency switch, an output radio frequency switch, and a switch control module; the input end of the input radio frequency switch is connected with the output end of the input radio frequency interface, the output end of the input radio frequency switch is connected with the filter bank, one end of the output radio frequency switch is connected with the filter bank, and the other end of the output radio frequency switch is connected with the output radio frequency interface. The switch control module is connected with the input radio frequency switch and the output radio frequency switch and is used for switching the switch to select a filtered frequency band.
9. A switch integrated signal preselector comprising a filter bank of at least two high pass band pass filters according to claim 7, an input, an output, a low noise amplifier module, an attenuator bank of at least two attenuators and a control module;
one end of the low noise amplifier module is connected with the input end, and the other end of the low noise amplifier module is connected with the attenuator group;
one end of the attenuator group is connected with the low noise amplifier module, and the other end of the attenuator group is connected with the filter group and is used for selecting an attenuation passage;
one end of the filter bank is connected with the attenuator bank, and the other end of the filter bank is connected with the output end and is used for selecting a filtered frequency band;
the control module is connected with the low noise amplifier module, the attenuator groups and the filter groups are connected and used for controlling the filter switch.
10. The switch-integrated signal pre-selector of claim 9 wherein the low noise amplifier module includes a pass-through path and a low noise amplification path, the pass-through path and the low noise amplification path being selected by a one-to-two switch.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710077121 | 2017-02-13 | ||
| CN201710077121X | 2017-02-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106788313A CN106788313A (en) | 2017-05-31 |
| CN106788313B true CN106788313B (en) | 2023-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710109140.6A Active CN106788313B (en) | 2017-02-13 | 2017-02-27 | Feed circuit of filter and device based on feed circuit |
| CN201720176915.7U Withdrawn - After Issue CN206878789U (en) | 2017-02-13 | 2017-02-27 | Feed circuit, bandpass filter, switch filtering device assembly, signal preselector |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720176915.7U Withdrawn - After Issue CN206878789U (en) | 2017-02-13 | 2017-02-27 | Feed circuit, bandpass filter, switch filtering device assembly, signal preselector |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788313B (en) * | 2017-02-13 | 2023-10-10 | 石家庄创天电子科技有限公司 | Feed circuit of filter and device based on feed circuit |
| CN107612520A (en) * | 2017-09-20 | 2018-01-19 | 戴承萍 | Bandpass filter |
| CN111010141B (en) * | 2019-11-15 | 2024-08-23 | 天津大学 | Filter, radio frequency front-end circuit and communication device |
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| TW201220591A (en) * | 2010-11-11 | 2012-05-16 | Mezzalingua John Ass | Filter circuit |
| CN102522615A (en) * | 2011-12-01 | 2012-06-27 | 华南理工大学 | Miniature dual-band band-pass filter with adjustable low band |
| CN103138705A (en) * | 2011-12-01 | 2013-06-05 | 西安电子科技大学 | Band-pass filter |
| CN104051827A (en) * | 2014-06-24 | 2014-09-17 | 中国科学院微电子研究所 | Broadband band-pass filter based on spiral defect ground |
| CN104078726A (en) * | 2014-06-04 | 2014-10-01 | 中国电子科技集团公司第十研究所 | Parallel connection type unilateral elliptic function transmission line filter |
| CN104733813A (en) * | 2015-03-16 | 2015-06-24 | 华南理工大学 | Broadband bandpass filter with frequency and bandwidth reconfigurable |
| CN206878789U (en) * | 2017-02-13 | 2018-01-12 | 石家庄创天电子科技有限公司 | Feed circuit, bandpass filter, switch filtering device assembly, signal preselector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI350610B (en) * | 2008-07-29 | 2011-10-11 | Ind Tech Res Inst | Band-pass filter circuit and multi-layer structure and method thereof |
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2017
- 2017-02-27 CN CN201710109140.6A patent/CN106788313B/en active Active
- 2017-02-27 CN CN201720176915.7U patent/CN206878789U/en not_active Withdrawn - After Issue
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201220591A (en) * | 2010-11-11 | 2012-05-16 | Mezzalingua John Ass | Filter circuit |
| CN102522615A (en) * | 2011-12-01 | 2012-06-27 | 华南理工大学 | Miniature dual-band band-pass filter with adjustable low band |
| CN103138705A (en) * | 2011-12-01 | 2013-06-05 | 西安电子科技大学 | Band-pass filter |
| CN104078726A (en) * | 2014-06-04 | 2014-10-01 | 中国电子科技集团公司第十研究所 | Parallel connection type unilateral elliptic function transmission line filter |
| CN104051827A (en) * | 2014-06-24 | 2014-09-17 | 中国科学院微电子研究所 | Broadband band-pass filter based on spiral defect ground |
| CN104733813A (en) * | 2015-03-16 | 2015-06-24 | 华南理工大学 | Broadband bandpass filter with frequency and bandwidth reconfigurable |
| CN206878789U (en) * | 2017-02-13 | 2018-01-12 | 石家庄创天电子科技有限公司 | Feed circuit, bandpass filter, switch filtering device assembly, signal preselector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106788313A (en) | 2017-05-31 |
| CN206878789U (en) | 2018-01-12 |
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