CN107039718B - A kind of electricity-tunable filter of constant absolute bandwidth - Google Patents
A kind of electricity-tunable filter of constant absolute bandwidth Download PDFInfo
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- CN107039718B CN107039718B CN201710206092.2A CN201710206092A CN107039718B CN 107039718 B CN107039718 B CN 107039718B CN 201710206092 A CN201710206092 A CN 201710206092A CN 107039718 B CN107039718 B CN 107039718B
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- tunable 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
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape resonators
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Abstract
The invention discloses a kind of electricity-tunable filter of constant absolute bandwidth, entire electricity-tunable filter symmetrical configuration is equal sized.The overall structure of electricity-tunable filter of the present invention can be divided into three layers of upper, middle and lower, the upper layer of electricity-tunable filter is microstrip circuitry, which includes feeder line (11), feeder line (12), resonator one, resonator two and DC feedback.The middle layer of electricity-tunable filter is medium substrate, includes multiple metallization VIAs on medium substrate.The lower layer of electricity-tunable filter is covered with metallic copper.There is electricity-tunable filter of the present invention centre frequency to be continuously adjusted in a certain range, and at the same time the characteristics of keeping constant absolute bandwidth.
Description
Technical field
The present invention relates to tunable filter fields, and in particular to a kind of electricity-tunable filter of constant absolute bandwidth.
Background technique
Filter is the essential composition portion of the systems such as modern microwave relayed communications, microwave satellite communication, electronic countermeasure
Point, while being also mostly important, the highest microwave passive component of technology content.At present for the research master of electricity-tunable filter
Concentrate on centre frequency it is adjustable on, but have ignored tuning when absolute bandwidth variation.However in practical applications, it communicates
The bandwidth of system be all it is determining constant, this requires electricity-tunable filters to keep absolute in switch operating frequency
Bandwidth is constant, therefore the electricity-tunable filter for studying constant absolute bandwidth has practical significance.
Summary of the invention
It is an object of the invention to be directed to the deficiency of above-mentioned background technique, meet in communication equipment to electricity-tunable filter
The requirement for keeping constant absolute bandwidth constant, proposes a kind of electricity-tunable filter of constant absolute bandwidth.
The present invention solves its technical problem and is achieved through the following technical solutions:
A kind of electricity-tunable filter of constant absolute bandwidth, including medium substrate (1), the medium substrate upper layer printing
There is microstrip circuitry, and the medium substrate underlying surfaces are provided with copper sheet；
The microstrip circuitry includes one resonator two of resonator, and one resonator two of resonator includes short circuit
Minor matters (31), open circuit minor matters (41), open circuit rectangular patch (51), connecting line (61) and varactor (71), the open circuit minor matters
It (41) include connected first part and second part, first part and second part are rectangle, and the length of first part
Greater than the length of second part, the width of first part is greater than the width of second part；
The short circuit minor matters (31) and open circuit minor matters (41) are separately positioned on two ports of connecting line (61), the open circuit
The second part of minor matters (41) is connect with connecting line (61), and the short circuit minor matters (31) and open circuit minor matters (41) are located at connecting line
(61) the same side, and offered metallization VIA (111) on the short-circuit minor matters (31), and the metallization VIA (111)
It penetrates through medium substrate (1)；The port that open circuit minor matters (41) is connected on the connecting line (61) is provided with varactor (71), described
Varactor (71) one end is connect with connecting line (61), and varactor (71) other end is connect with open circuit rectangular sheet (51)；It is described
Open circuit rectangular sheet (51) is connected with DC feedback, and the DC feedback includes choke induction (91) and pad (101), the open circuit
Rectangular sheet (51) is connect far from the one end of varactor (71) with choke induction (91), and the choke induction (91) is far from open circuit rectangle
One end of piece (51) is connect with pad (101)；
It is provided with feeder line one (11) between short-circuit minor matters (31) and open circuit minor matters (41) on the resonator one, and described
Feeder line one (11) is connected on the connecting line (61) of resonator one；Short-circuit minor matters (31) and open circuit minor matters on the resonator two
(41) feeder line two (12) is provided between, and the feeder line two (12) is connected on the connecting line (61) of resonator two；
Two resonator one of resonator is in the upper layer of medium substrate (1) bilateral symmetry, and the resonator two is harmonious
The device one that shakes is stepping electric impedance resonator.
Further, the feeder line one (11) is the input port of the electricity-tunable filter of the constant absolute bandwidth,
The feeder line two (12) is the output port of the electricity-tunable filter of the constant absolute bandwidth；Or the feeder line one (11)
For the output port of the electricity-tunable filter of the constant absolute bandwidth, the feeder line two (12) is the constant absolute bandwidth
Electricity-tunable filter input port.
Further, the characteristic impedance of feeder line one (11) and feeder line two (12) is 50 ohm.
Further, the feeder line one (11) is vertical with connecting line (61), and the feeder line two (12) and connecting line (61)
Vertically.
Further, the pore size of the metallization VIA (111) is all the same, and the metallization VIA (111)
Pitch of holes is all the same.
The invention has the benefit that
Electricity-tunable filter is by rationally designing the structure snd size of entire filter in the present invention, control be electrically coupled and
Magnetic-coupled power makes total coefficient of coup remain anti-with centre frequency to reach the reasonable control to hybrid electromagnetic coupling
It remains unchanged than relationship, is kept constant to realize the absolute bandwidth of filter within the scope of adjustable frequency.And pass through tune
It is continuously adjustable within the scope of fixed frequency to realize centre frequency for the reversed bias voltage for saving varactor DC feedback；To meet
Modern Communication System is to the regulable center frequency of filter and keeps the requirement of constant absolute bandwidth.
Detailed description of the invention
Fig. 1 is the schematic diagram that the present invention uses printed circuit board；
Fig. 2 is the schematic top plan view of electricity-tunable filter of the present invention；
Fig. 3 is the scattering parameter emulation of electricity-tunable filter of the present invention, is emulated using HFSS software；
Fig. 4 is the test result of electricity-tunable filter of the present invention, is tested using Agilent N5230C vector network
Analyzer.
Description of symbols:
The upper metal layer of 1- dielectric substrate, 2-, 3- lower metal layer, 11- feeder line one, 12- feeder line two, 31- short circuit minor matters, 41-
Open circuit minor matters, 51- open circuit rectangular sheet, 61- connecting line, 71- varactor, 91- choke induction, 101- pad, 111- metallized
Hole.
Specific embodiment
Below by specific embodiment, the invention will be further described, and it is not limit that following embodiment, which is descriptive,
Qualitatively, this does not limit the scope of protection of the present invention.
It will be understood to those skilled in the art that unless otherwise defined, all terms used herein have and the present invention
The identical meaning of the general understanding of those of ordinary skill in fields.It should also be understood that fixed in such as general dictionary
Those of justice term, which should be understood that, to be had a meaning that is consistent with the meaning in the context of the prior art, and unless as this
In equally define, will not be explained in an idealized or overly formal meaning.
A kind of electricity-tunable filter of constant absolute bandwidth, including medium substrate 1, the present invention use relative dielectric constant
Be 2.2, with a thickness of 0.508mm pcb board as medium substrate, can also be using the pcb board of other specifications as substrate.Such as figure
Shown in 1, it is respectively coated by upper metal layer 2 and lower metal layer 3 in the upper and lower surfaces of the medium substrate 1 of pcb board, upper metal layer 2 is adopted
With the material to conduct electricity very well, copper product is can be used in upper metal layer 2, and upper metal layer 2 is gold-plated once in a while prevents from aoxidizing.Lower metal layer
Ground of the 3 optional copper sheets as entire filter.Upper metal layer 2 is the circuit structure of filter, is printed on upper metal layer 2 micro-
Band line circuit, microstrip circuitry includes symmetrical one resonator two of resonator.
As shown in Fig. 2, one resonator two of resonator includes short-circuit minor matters 31, open circuit minor matters 41, open circuit rectangular patch
51, connecting line 61 and varactor 71.Metallization VIA 111 is offered in short-circuit minor matters 31, and metallization VIA 111 penetrates through medium
Substrate 1 passes through 111 ground connection of metallization VIA combination.Metallization VIA 111 penetrates through medium substrate 1.The half of metallization VIA 111
Diameter is 0.3mm, and the spacing of metallization VIA 111 is 1mm.Minor matters 41 of opening a way include first part and second part, first part
It is rectangle with second part, and the length of first part is greater than the length of second part, the width of first part is greater than second
Partial width.
Symmetry axis along one resonator two of resonator establishes Y-axis, and the direction vertical with connecting line 61 is X-axis.Wherein connect
The length of wiring 61 along the y axis is 8mm, and length along the x axis is 1.1mm, and the company in one resonator two of resonator
The spacing of wiring 61 is 0.8mm.
Short-circuit minor matters 31 and open circuit minor matters 41 are separately positioned on two ports of connecting line 61, constitute U-shaped.Short-circuit minor matters 31
Length along the x axis is 4.5mm, and length along the y axis is 2.5mm, and short-circuit minor matters 31 are connected with 61 top of connecting line.It opens
The length of the second part of road minor matters 41 along the x axis is 0.3mm, and the length of second part along the y axis is 2.4mm；Open circuit
The length of the first part of minor matters 41 along the x axis is 3.5mm, and the length of first part along the y axis is 4mm.
The port that open circuit minor matters 41 are connected on connecting line 61 is provided with varactor 71,71 one end of varactor and connecting line 61
Connection, 71 other end of varactor are connect with open circuit rectangular sheet 51, and varactor 71 is loaded onto open circuit minor matters 41 and open circuit rectangular patch
Between 51, for changing the electrical length of open circuit rectangular patch 51.Rectangular sheet 51 of opening a way along Y-axis and along the length of X-axis is
3.5mm, and bottom end 1mm of the rectangular sheet 51 apart from connecting line 61 that open a way.
Open circuit rectangular sheet 51 is connected with DC feedback, and DC feedback includes choke induction 91 and pad 101, rectangular sheet of opening a way
51 one end far from varactor 71 is connect with choke induction 91, choke induction 91 one end and pad far from open circuit rectangular sheet 51
101 connections.The reversed bias voltage of varactor 71 is loaded by pad 101, and choke induction 91 is used to guarantee the normal work of direct current signal
The integrality of work and AC signal.Pad 101 is the square that side length is 1mm, and the inductance value of choke induction 91 is 22nH.
It is provided with feeder line 1 between short-circuit minor matters 31 on resonator one and open circuit minor matters 41, and feeder line 1 vertically connects
It connects on the connecting line 61 of resonator one.Feeder line two is provided between short-circuit minor matters 31 on resonator two and open circuit minor matters 41
12, and feeder line 2 12 is vertically connected on the connecting line 61 of resonator two.The top of feeder line 1 and feeder line 2 12 along the y axis
It is 2.7mm apart from connecting line top, the bottom end of feeder line 1 and feeder line 2 12 along the y axis is 4.2mm apart from connecting line bottom end,
The length of feeder line 1 and feeder line 2 12 along the x axis is 8mm, and the length of feeder line 1 and feeder line 2 12 along the y axis is
1.1mm。
Feeder line 1 is the input port of the electricity-tunable filter of constant absolute bandwidth, and feeder line 2 12 is that absolute bandwidth is permanent
The output port of fixed electricity-tunable filter.Or feeder line 1 is the output of the electricity-tunable filter of constant absolute bandwidth
Port, feeder line 2 12 are the input port of the electricity-tunable filter of constant absolute bandwidth.The spy of feeder line 1 and feeder line 2 12
Property impedance is 50 ohm.Input port and output port of the invention is all made of SMA welding, so as to access test or with
Circuit is connected.
Two resonators are stepping electric impedance resonators in the present invention, by adjust resonator in varactor reversed bias voltage come
The variation of centre frequency is adjusted, varactor reversed bias voltage is loaded by pad, and choke induction is for guaranteeing the normal work of direct current signal
Make and guarantee the integrality of AC signal.In the case where design absolute bandwidth is constant, obtained ideally according to theory
Then the relationship of the coefficient of coup and centre frequency optimizes coupled structure dimensional parameters, the coefficient of coup extracted under different parameters is gone
It is fitted ideal situation, to achieve the purpose that keep absolute bandwidth constant.Wherein magnetic coupling by feeder line connect microstrip line position,
The spacing in the bore dia of metallization VIA and hole is adjusted；It is electrically coupled through the spacing of two microstrip lines and adjusts.
The short-circuit minor matters 31 on filter top are grounded by metallization VIA 111, are that entire filter magnetic coupling is strongest
Part, the size and spacing of metallization VIA 111 can all have an impact coupling strength, and feeder line and microstrip circuitry connect
The position connect can also have an impact magnetic coupling.The main spacing by two connecting lines 61 is electrically coupled to determine.Made by design total
The coefficient of coup maintains and the inverse relation of centre frequency is constant, that is, can reach the purpose for keeping constant absolute bandwidth.Pass through adjusting
The reversed bias voltage of varactor 71 can reach the purpose for making centre frequency consecutive variations.
As shown in Figure 3 and Figure 4, the scattering parameter emulation of filter of the present invention and measured result.The centre frequency of filter
Adjustable extent is that 2.5GHz-3GHz. absolute bandwidth is 150MHz.As can be seen that emulation and measured result base from Comparative result
This coincide, and surveys regulable center frequency range and absolute bandwidth is consistent with design of Simulation, wherein the insertion loss of measurement error
Reason slightly bigger than normal is derived from when mismachining tolerance and sub-miniature A connector overlap that there are one section of impedance mismatchs.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (5)
1. a kind of electricity-tunable filter of constant absolute bandwidth, it is characterised in that: including medium substrate (1), the medium base
Plate upper layer is printed with microstrip circuitry, and the medium substrate underlying surfaces are provided with copper sheet；
The microstrip circuitry includes one resonator two of resonator, and one resonator two of resonator includes short-circuit minor matters
(31), it opens a way minor matters (41), open circuit rectangular patch (51), connecting line (61) and varactor (71), the open circuit minor matters (41) wrap
Include connected first part and second part, first part and second part are rectangle, and the length of first part is greater than the
The length of two parts, the width of first part are greater than the width of second part；
The short circuit minor matters (31) and open circuit minor matters (41) are separately positioned on two ports of connecting line (61), the open circuit minor matters
(41) second part is connect with connecting line (61), offers metallization VIA (111) on the short circuit minor matters (31), and described
Metallization VIA (111) penetrates through medium substrate (1)；The port that open circuit minor matters (41) is connected on the connecting line (61) is provided with
Varactor (71), described varactor (71) one end are connect with connecting line (61), varactor (71) other end and open circuit rectangle
Piece (51) connection；The open circuit rectangular sheet (51) is connected with DC feedback, and the DC feedback includes choke induction (91) and weldering
Disk (101), open circuit rectangular sheet (51) connect far from the one end of varactor (71) with choke induction (91), the choke induction
(91) one end far from open circuit rectangular sheet (51) is connect with pad (101)；
Feeder line one (11), and the feeder line are provided between short-circuit minor matters (31) and open circuit minor matters (41) on the resonator one
One (11) are connected on the connecting line (61) of resonator one, and the feeder line one, short-circuit minor matters (31) and open circuit minor matters (41) are located at
The same side of connecting line (61)；Feeder line two is provided between short-circuit minor matters (31) and open circuit minor matters (41) on the resonator two
(12), and the feeder line two (12) is connected on the connecting line (61) of resonator two；
Two resonator one of resonator is in the upper layer of medium substrate (1) bilateral symmetry, and two resonator of the resonator
One is stepping electric impedance resonator.
2. a kind of electricity-tunable filter of constant absolute bandwidth as described in claim 1, it is characterised in that: the feeder line one
It (11) is the input port of the electricity-tunable filter of the constant absolute bandwidth, the feeder line two (12) is the absolute bandwidth
The output port of constant electricity-tunable filter；Or the feeder line one (11) is the electric tunable of the constant absolute bandwidth
The output port of filter, the feeder line two (12) are the input port of the electricity-tunable filter of the constant absolute bandwidth.
3. a kind of electricity-tunable filter of constant absolute bandwidth as claimed in claim 2, it is characterised in that: feeder line one (11)
Characteristic impedance with feeder line two (12) is 50 ohm.
4. a kind of electricity-tunable filter of constant absolute bandwidth as claimed in claim 3, it is characterised in that: the feeder line one
(11) vertical with connecting line (61), and the feeder line two (12) is vertical with connecting line (61).
5. a kind of electricity-tunable filter of constant absolute bandwidth as described in claim 1, it is characterised in that: the metallization
The pore size of via hole (111) is all the same, and the pitch of holes of the metallization VIA (111) is all the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710206092.2A CN107039718B (en) | 2017-03-31 | 2017-03-31 | A kind of electricity-tunable filter of constant absolute bandwidth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710206092.2A CN107039718B (en) | 2017-03-31 | 2017-03-31 | A kind of electricity-tunable filter of constant absolute bandwidth |
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| Publication Number | Publication Date |
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| CN107039718A CN107039718A (en) | 2017-08-11 |
| CN107039718B true CN107039718B (en) | 2019-04-12 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664296A (en) * | 2012-04-27 | 2012-09-12 | 西安电子科技大学 | Low-insertion-loss and constant-absolute-bandwidth electrically-tunable band-pass filter |
| CN105789787A (en) * | 2016-03-29 | 2016-07-20 | 华南理工大学 | Frequency and bandwidth adjustable broadband balanced band pass filter |
-
2017
- 2017-03-31 CN CN201710206092.2A patent/CN107039718B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664296A (en) * | 2012-04-27 | 2012-09-12 | 西安电子科技大学 | Low-insertion-loss and constant-absolute-bandwidth electrically-tunable band-pass filter |
| CN105789787A (en) * | 2016-03-29 | 2016-07-20 | 华南理工大学 | Frequency and bandwidth adjustable broadband balanced band pass filter |
Non-Patent Citations (3)
| Title |
|---|
| "a quasi elliptic function 1.75-2.25GHz 3-pole bandpass filter with bandwidth control";Yi-chyun Chiou et al;《IEEE Transactions on microwave theory and techniques》;20120228;第60卷(第2期);第244-249页 |
| "Dual-band reconfigurable bandpass filter with independently controlled passbands and constant absolute bandwidths";Zhi-Han Chen et al;《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》;20160228;第26卷(第2期);第92-94页 |
| "具有恒定绝对带宽的射频电调带阻滤波器研究";黄勋等;《2011年全国微波毫米波会议》;20110601;第524-527页 |
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Effective date of registration: 20221212 Address after: 1009 Tianyuan East Road, Jiangning District, Nanjing City, Jiangsu Province Patentee after: Nanjing Sanhang Information Engineering Co.,Ltd. Address before: No. 29, Qinhuai District, Qinhuai District, Nanjing, Jiangsu Patentee before: Nanjing University of Aeronautics and Astronautics |