CN108550966A - A kind of adjustable microstrip bandpass filter that regulable center frequency absolute bandwidth is constant - Google Patents
A kind of adjustable microstrip bandpass filter that regulable center frequency absolute bandwidth is constant Download PDFInfo
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- CN108550966A CN108550966A CN201810326174.5A CN201810326174A CN108550966A CN 108550966 A CN108550966 A CN 108550966A CN 201810326174 A CN201810326174 A CN 201810326174A CN 108550966 A CN108550966 A CN 108550966A
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- cavity
- region domain
- copper region
- lying copper
- bandpass filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention relates to a kind of adjustable microstrip bandpass filter that regulable center frequency absolute bandwidth is constant, which includes：Metal rectangular chamber：Include the cavity upper cover and cavity base that resonance chamber is fixedly connected to form by the fixed cavity screw of quadrangle, the cavity base is equipped with to realize the cavity groove of cavity resonance：Microstrip line plate：It is fixed on metal rectangular intracavitary portion by fixed cavity screw, and is oppositely arranged with cavity groove, the three rank LC resonance structures by can be changed capacitance realize the adjusting of centre frequency.Compared with prior art, the present invention has many advantages, such as that regulable center frequency is humorous, is convenient for debugging.
Description
Technical field
The present invention relates to Two-port netwerk microwave device, more particularly, to a kind of constant adjustable of regulable center frequency absolute bandwidth
Microstrip bandpass filter.
Background technology
There are many implementation method, microstrip line, waveguide, half lumped filter, various filters to have respectively for microwave band-pass filter
From advantage and disadvantage.Traditional microstrip line comb filter is usually needed since microstrip line characteristic is difficult to realize preferable selecting frequency characteristic
High selecting frequency characteristic is realized by increasing the exponent number of filter, not only increase the size of filter in this way, but also increase filtering
The insertion loss of device.Waveguide filter has preferable selecting frequency characteristic, but size depends critically upon frequency, as frequency is got over
Low, waveguide filter size is bigger.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of regulable center frequencies
The constant adjustable microstrip bandpass filter of absolute bandwidth.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of adjustable microstrip bandpass filter that regulable center frequency absolute bandwidth is constant, the filter include：
Metal rectangular chamber：Include by the fixed cavity screw of quadrangle be fixedly connected to form resonance chamber cavity upper cover and
Cavity base, the cavity base are equipped with to realize the cavity groove of cavity resonance：
Microstrip line plate：It is fixed on metal rectangular intracavitary portion by fixed cavity screw, and is oppositely arranged with cavity groove,
The three rank LC resonance structures by can be changed capacitance realize the adjusting of centre frequency.
The microstrip line plate includes medium substrate and is separately positioned on the substrate top layer of medium substrate upper surface under
The substrate bottom on surface.
The substrate top layer is equipped with 3 varactors, 3 feed-through capacitors and 8 lying copper region domains, wherein first
Lying copper region domain and the 5th lying copper region domain are separately positioned on the left and right sides of substrate top layer, and are welded respectively with SMA radio frequency sockets, remain
Remaining six lying copper region domains, 3 varactors and 3 feed-through capacitors constitute three rank LC resonance structure settings and cover copper first
Between region and the 5th lying copper region domain.
First varactor is arranged between second copper-clad region and the 6th lying copper region domain, the 6th lying copper region domain
The first single order LC resonance circuit of equivalent composition, the second varactor are connect with variable DC voltage source by the first feed-through capacitor
It is arranged between third lying copper region domain and the 7th lying copper region domain, the 7th lying copper region domain is by the second feed-through capacitor and can be changed
Direct voltage source connects the second single order LC resonance circuit of equivalent compositions, and third varactor is arranged in the 4th lying copper region domain and the
Between eight lying copper region domains, the 8th lying copper region domain connect equivalent composition with variable DC voltage source by third feed-through capacitor
Third single order LC resonance circuit, the first single order LC resonance circuit, the second single order LC resonance circuit and third single order LC are humorous
The circuit that shakes forms three rank LC resonance structures by being spaced capacitive coupling.
The capacitance adjustable range of the varactor is 0.5-10pF.
The substrate bottom is equipped with contact with cavity base as with reference to ground, and is arranged the of upper and lower both sides
Nine lying copper region domains and the tenth lying copper region domain.
The medium substrate is polytetrafluoroethylene (PTFE) epoxy resin-matrix plate, thickness 0.8mm.
The size of the metal rectangular chamber is 66mm*30mm*10mm.
On the cavity lid be equipped with 3 installation feed-through capacitors mounting holes, the cavity base be equipped with to
The SMA radio frequency interfaces of SMA radio frequency sockets are installed.
Microstrip bandpass filter structure that this is adjustable is in left and right mirror symmetry.
Compared with prior art, the present invention has the following advantages：
The present invention is applied the advantages of metal cavity high quality value by being combined comb line filter and metal cavity
In comb line filter, better selecting frequency characteristic is realized, and increase feed-through capacitor and feed to the design realization of varactor
Centre frequency it is tunable, and improve Out-of-band rejection characteristic, for another angle, the present invention may be considered one
The approximate strip line filter of kind, the upper lower wall of metal cavity are equivalent to the levels of strip line, and middle layer is cabling, is overcome
The shortcomings that traditional strip line filter inconvenience is debugged.
Description of the drawings
Fig. 1 is that the three-dimensional structure of the present invention disassembles schematic diagram.
Fig. 2 is cavity body structure schematic diagram.
Fig. 3 is microstrip line plate top level structure schematic diagram.
Fig. 4 is microstrip line board bottom schematic diagram of a layer structure.
Fig. 5 is the Comparative result of cavity body filter and conventional combline filters.
Fig. 6 is the result of filter electric tuning of the present invention.
Drawing reference numeral explanation：1, cavity upper cover, 2, microstrip line plate, 3, cavity base, 31, cavity groove, 4, SMA radio frequencies
Socket, 5, feed-through capacitor mounting hole, the 51, first feed-through capacitor pad, the 52, second feed-through capacitor pad, 53, third punching
Capacitance pad, 6, medium substrate, the 61, first varactor, the 62, second varactor, 63, third varactor,
71, the first lying copper region domain, 72, second copper-clad region, 73, third lying copper region domain, the 74, the 4th lying copper region domain, the 75, the 5th lying copper region
Domain, the 76, the 6th lying copper region domain, the 77, the 7th lying copper region domain, the 78, the 8th lying copper region domain, the 79, the 9th lying copper region domain, the 70, the tenth covers
Copper region, the 81, first fixed cavity screw, the 82, second fixed cavity screw, the 83, third fixed cavity screw, the 84, the 4th is solid
Determine cavity screw, 9, SMA radio frequency interfaces, 10, fixed SMA radio frequency interface screws, 11, cavity screw hole, 12, SMA radio frequency sockets
Solder joint.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
As shown in Figure 1, metal rectangular chamber is a rectangular body cavity, it is divided into cavity upper cover 1,2 He of microstrip line plate from top to bottom
Cavity base 3；(the SMA radio frequency interfaces of SMA radio frequency interfaces 9：A kind of radio frequency interface of specific model and size, can also be other
Model) as the signal of cavity body filter interface is output and input, it is fixed by screws in cavity base.
As shown in Fig. 2, cavity upper cover 1 and 3 pedestal of cavity are fixed by four screw 81-84, screw is dimensioned for working as
The size of preceding metal cavity, in order to which fixed cavity is allowed to form a closed wire chamber environment；It is solid first
The centre for determining cavity screw 81 and the 4th fixed cavity screw 84, stay there are three feed-through capacitor mounting hole 5 for install punching electricity
Hold, is fed to the varactor of inside cavity by feed-through capacitor, inside cavity structure sees below detailed description；
As shown in Figures 3 and 4 is the top layer and fabric of micro-strip line substrate respectively, and micro-strip line substrate is positioned on cavity
Among lid and cavity base.
Shown in Fig. 3 is the top layer of substrate, and centre is dielectric layer (medium substrate 6), using the polytetrafluoroethyl-ne of 0.8mm thickness
Alkene epoxy resin double sided timber (can also be other materials, lower section is described), shown in Fig. 4 is the bottom of substrate；Medium base
Four angles of plate 6 are respectively kept with the cavity screw hole 11 of 4 fixed cavity screws, and screw can pass through the cavity screw hole 11, Gu
Surely cavity base 3 is arrived；
Substrate top layer is mainly made of eight lying copper region domains：Wherein the first lying copper region domain 71 and the 5th lying copper region domain 75 are divided
It She You not SMA radio frequency sockets pad 12；6th lying copper region domain 76, the 7th lying copper region domain 77 and the 8th lying copper region domain 78 are made respectively
For the first feed-through capacitor pad 51, the second feed-through capacitor pad 52 and third feed-through capacitor pad 53；First transfiguration two
Pole pipe 61 is located among second copper-clad region 72 and the 6th lying copper region domain 76, and the both ends of the first varactor 61 pass through welding point
It is not fixed on second copper-clad region 72 and the 6th lying copper region domain 76, the second varactor 62 is located at third lying copper region domain 73
Among the 7th lying copper region domain 77, the both ends of the second varactor 62 are separately fixed at 73 He of third lying copper region domain by welding
On 7th lying copper region domain 77, third varactor 63 is located among the 4th lying copper region domain 74 and the 8th lying copper region domain 78, third
The both ends of varactor 63 are separately fixed at by welding on the 4th lying copper region domain 74 and the 8th lying copper region domain 78.
Shown in Fig. 4 is the bottom of substrate, in addition to four angles are respectively kept with the cavity screw hole 11 of 4 fixed cavity screws
Outside, substrate bottom is mainly made of the 9th lying copper region domain 79 and the tenth lying copper region domain 70, which is mainly used for and metal cavity
Contact, the reference ground as substrate.
All contain " medium substrate 6 " in figs. 3 and 4, here it is the middle dielectric layer described before (due to top layer,
Middle dielectric layer, bottom are the entirety of a connection, therefore the signal of two width figures all embodies the dielectric layer), the material of dielectric layer
Using polytetrafluoroethylene (PTFE) epoxy resin material.
Working principle of the present invention is as follows：
Cavity comb filter of the present invention is collectively formed by metal cavity and microstripline filter；
Three rank pectinate line microstripline filters, second copper-clad region therein are realized on double-layer microstrip-line medium substrate 6
72, the 6th lying copper region domain 76 and the first varactor 61 can be equivalent to single order LC resonance circuit (L is inductance, C be electricity
Hold)；Similarly, second copper-clad region 72, the 7th lying copper region domain 77 and the second varactor 62 can equally be equivalent to single order LC
Resonance circuit, the 4th lying copper region domain 74, the 8th lying copper region domain 78 can equally be equivalent to single order LC with third varactor 63
Resonance circuit；This No. three resonance circuit forms three rank LC resonances by intermediate interval (interval can be equivalent to capacitance) coupling
Circuit；Similarly, the interval and the 4th lying copper region domain 74 and the 5th between the first lying copper region domain 71 and second copper-clad region 72
Interval between lying copper region domain 75, can be equivalent to capacitive coupling, realize three rank LC resonance circuits and the first lying copper region respectively
Signal transmission between domain 71, the 5th lying copper region domain 75, and the first lying copper region domain 71, the 5th lying copper region domain 75 are connected respectively to
SMA radio frequency sockets 4 realize the transmission of signal as the signal input and output port of the cavity body filter；Wherein two pole of transfiguration
Pipe needs to supply DC voltage by feed-through capacitor, the change for realizing the reversed junction capacity of varactor by changing DC voltage
Change, the capacitance of varactor can be changed from 0.5pF to 10pF in the present invention, and pF is the unit of capacitance in circuit field, Chinese
" pico farad " achievees the purpose that " transfiguration " to realize the variation of capacitance, and the final resonant frequency for realizing LC resonance circuit can be
It can be changed in one segment limit, finally so that the frequency range of filter electric tuning of the present invention reaches an octave bandwidth, improving
After be likely to be breached multiple octaves；
Another important component of cavity as filter of the present invention, is made of cavity upper cover and cavity base, leads to
It crosses screw locking to fix, hollow metal groove belongs to closed metal space, realizes cavity resonance, metal cavity in the present invention
Size be：66mm*30mm*10mm.
Micro-strip line substrate is placed in such new construction among cavity, it can be in the performance base for retaining traditional comb filter
On plinth, the quality factor of microstripline filter are significantly improved.
Measured result comparison is as follows：
The Comparative result of cavity body filter (present invention) and conventional combline filters shown in fig. 5；Cavity body filter
Three dB bandwidth about 40MHz, and the three dB bandwidth of traditional comb line filter nearly 400MHz；Cavity body filter in 1GHz and
The decaying of 1.5GHz has respectively reached 60dB and 60dB；And decaying of the conventional filter in 0.5GHz and 1GHz only has 3dB respectively
(1GHz frequency points can not effectively inhibit also in the band of conventional filter) and 25dB；In contrast, cavity body filter selecting frequency characteristic
Advantage is more apparent；
Filter electric tuning of the present invention shown in fig. 6 as a result, by giving varactor to supply DC voltage, keep it anti-
Change between 0.25pF~8pF to the capacitance of junction capacity, the central frequency range as can be seen from the figure tuned is from 650MHz
To 1800MHz, almost two octaves, and the three dB bandwidth of the filter is maintained at 40MHz；Center frequency is realized simultaneously
Rate electric tuning and good selecting frequency characteristic；In entirely tuning band limits, actual test cavity body filter in-band insertion loss
Between 1.5dB-2.5dB, in-band insertion loss is similar with conventional combline filters；The present invention is realized by electric tuning
Broadband application allows its application range to reach the bandwidth range of conventional combline filters, while being filtered than conventional combline
Device has better Out-of-band rejection performance.
The present invention combines metal cavity to design on the basis of traditional comb line filter, promotes quality factor, enhancing choosing
Frequency characteristic, while using the strategy of varactor designs, realizing regulable center frequency.The adjusting of centre frequency needs to increase outer
Portion's DC power supply provides DC voltage and realizes that external dc voltage is after feed-through capacitor filters, to the transfiguration on medium substrate
Diode is fed, and the variation of the capacitance of varactor is realized by the variation of external dc voltage, to realize centre frequency
Tuning.The present invention has been obviously improved the selecting frequency characteristic of filter compared with existing combline bandpass filter, and also achieves
The centre frequency of 100% relative bandwidth tunes.
Claims (10)
1. a kind of adjustable microstrip bandpass filter that regulable center frequency absolute bandwidth is constant, which is characterized in that the filter packet
It includes：
Metal rectangular chamber：Include the cavity upper cover and cavity that resonance chamber is fixedly connected to form by the fixed cavity screw of quadrangle
Pedestal, the cavity base are equipped with to realize the cavity groove of cavity resonance：
Microstrip line plate：It is fixed on metal rectangular intracavitary portion by fixed cavity screw, and is oppositely arranged with cavity groove, is passed through
Three rank LC resonance structures of variable capacitance realize the adjusting of centre frequency.
2. a kind of constant adjustable microstrip bandpass filter of regulable center frequency absolute bandwidth according to claim 1,
It is characterized in that, the microstrip line plate includes medium substrate and is separately positioned on the substrate top layer of medium substrate upper surface under
The substrate bottom on surface.
3. a kind of constant adjustable microstrip bandpass filter of regulable center frequency absolute bandwidth according to claim 2,
It is characterized in that, the substrate top layer is equipped with 3 varactors, 3 feed-through capacitors and 8 lying copper region domains, wherein first
Lying copper region domain and the 5th lying copper region domain are separately positioned on the left and right sides of substrate top layer, and are welded respectively with SMA radio frequency sockets, remain
Remaining six lying copper region domains, 3 varactors and 3 feed-through capacitors constitute three rank LC resonance structure settings and cover copper first
Between region and the 5th lying copper region domain.
4. a kind of constant adjustable microstrip bandpass filter of regulable center frequency absolute bandwidth according to claim 3,
It is characterized in that, the first varactor is arranged between second copper-clad region and the 6th lying copper region domain, the 6th lying copper region
Domain connect the first single order LC resonance circuit of equivalent composition, two pole of the second transfiguration by the first feed-through capacitor with variable DC voltage source
Pipe be arranged between third lying copper region domain and the 7th lying copper region domain, the 7th lying copper region domain by the second feed-through capacitor with can
Inversion of direct current voltage source connect the second single order LC resonance circuit of equivalent compositions, third varactor setting the 4th lying copper region domain with
Between 8th lying copper region domain, the 8th lying copper region domain connect equivalent structure with variable DC voltage source by third feed-through capacitor
At third single order LC resonance circuit, the first single order LC resonance circuit, the second single order LC resonance circuit and the third single order LC
Resonance circuit forms three rank LC resonance structures by being spaced capacitive coupling.
5. a kind of constant adjustable microstrip bandpass filter of regulable center frequency absolute bandwidth according to claim 3,
It is characterized in that, the capacitance adjustable range of the varactor is 0.5-10pF.
6. a kind of constant adjustable microstrip bandpass filter of regulable center frequency absolute bandwidth according to claim 2,
It is characterized in that, the substrate bottom is equipped with contacted with cavity base as reference ground, and is arranged in upper and lower both sides
9th lying copper region domain and the tenth lying copper region domain.
7. a kind of constant adjustable microstrip bandpass filter of regulable center frequency absolute bandwidth according to claim 2,
It is characterized in that, the medium substrate is polytetrafluoroethylene (PTFE) epoxy resin-matrix plate, thickness 0.8mm.
8. a kind of constant adjustable microstrip bandpass filter of regulable center frequency absolute bandwidth according to claim 1,
It is characterized in that, the size of the metal rectangular chamber is 66mm*30mm*10mm.
9. a kind of constant adjustable microstrip bandpass filter of regulable center frequency absolute bandwidth according to claim 3,
Be characterized in that, on the cavity lid be equipped with 3 installation feed-through capacitors mounting holes, the cavity base be equipped with to
The SMA radio frequency interfaces of SMA radio frequency sockets are installed.
10. a kind of constant adjustable microstrip bandpass filter of regulable center frequency absolute bandwidth according to claim 1,
It is characterized in that, microstrip bandpass filter structure that this is adjustable is in left and right mirror symmetry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810326174.5A CN108550966B (en) | 2018-04-12 | 2018-04-12 | Adjustable microstrip band-pass filter with adjustable center frequency and invariable absolute bandwidth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810326174.5A CN108550966B (en) | 2018-04-12 | 2018-04-12 | Adjustable microstrip band-pass filter with adjustable center frequency and invariable absolute bandwidth |
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| Publication Number | Publication Date |
|---|---|
| CN108550966A true CN108550966A (en) | 2018-09-18 |
| CN108550966B CN108550966B (en) | 2023-05-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109346804A (en) * | 2018-11-02 | 2019-02-15 | 中国电子科技集团公司第三十六研究所 | A kind of tunable filter of constant bandwidth |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403556A (en) * | 2010-09-10 | 2012-04-04 | 中国科学院物理研究所 | Tunable superconducting filter, and manufacturing method and metal shielding box of tunable superconducting filter |
| CN102610888A (en) * | 2012-02-27 | 2012-07-25 | 浙江纺织服装职业技术学院 | Radio frequency filter capable of automatically sensing and rapidly regulating frequency and bandwidth |
| CN106450612A (en) * | 2016-11-23 | 2017-02-22 | 广西大学 | High-Q-value low-loss ultrahigh-frequency high-temperature superconducting filter |
| CN208173758U (en) * | 2018-04-12 | 2018-11-30 | 上海健康医学院 | A kind of electrically tunable cavity combline bandpass filter |
-
2018
- 2018-04-12 CN CN201810326174.5A patent/CN108550966B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403556A (en) * | 2010-09-10 | 2012-04-04 | 中国科学院物理研究所 | Tunable superconducting filter, and manufacturing method and metal shielding box of tunable superconducting filter |
| CN102610888A (en) * | 2012-02-27 | 2012-07-25 | 浙江纺织服装职业技术学院 | Radio frequency filter capable of automatically sensing and rapidly regulating frequency and bandwidth |
| CN106450612A (en) * | 2016-11-23 | 2017-02-22 | 广西大学 | High-Q-value low-loss ultrahigh-frequency high-temperature superconducting filter |
| CN208173758U (en) * | 2018-04-12 | 2018-11-30 | 上海健康医学院 | A kind of electrically tunable cavity combline bandpass filter |
Non-Patent Citations (4)
| Title |
|---|
| MOHAMMED A. EL-TANANI等: "Corrugated Microstrip Coupled Lines for Constant Absolute Bandwidth Tunable Filters" * |
| NINO ZAHIROVIC等: "Tunable suspended substrate stripline filters with constant bandwidth" * |
| XIAOGUO HUANG等: "Synthesis and Design of Tunable Bandpass Filters with Constant Absolute Bandwidth Using Varactor-Loaded Microstrip Resonator" * |
| Z. P. WANG等: "Microstrip Tunable Bandpass Filter with the Colinear Resonators" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109346804A (en) * | 2018-11-02 | 2019-02-15 | 中国电子科技集团公司第三十六研究所 | A kind of tunable filter of constant bandwidth |
| CN109346804B (en) * | 2018-11-02 | 2020-07-31 | 中国电子科技集团公司第三十六研究所 | Adjustable filter with constant bandwidth |
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| CN108550966B (en) | 2023-05-02 |
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