CN105680128B - Independent electrical Tunable dual band bandpass filter - Google Patents
Independent electrical Tunable dual band bandpass filter Download PDFInfo
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- CN105680128B CN105680128B CN201610165566.9A CN201610165566A CN105680128B CN 105680128 B CN105680128 B CN 105680128B CN 201610165566 A CN201610165566 A CN 201610165566A CN 105680128 B CN105680128 B CN 105680128B
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- microstrip line
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- resonator
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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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Abstract
The invention discloses a kind of independent electrical Tunable dual band bandpass filters, resonator, incoming feeder, output feeder and the outer circuits loaded including dielectric-slab, earth plate, the first quarter-wave resonance device, the second quarter-wave resonance device, short-circuit minor matters, resonator, incoming feeder, output feeder and the outer circuits that first quarter-wave resonance device, the second quarter-wave resonance device, short-circuit minor matters load are arranged at the upper surface of medium substrate, and the lower surface of medium substrate is arranged in earth plate；The resonator of short-circuit minor matters load is about filter center axis bilateral symmetry, and two quarter-wave resonance devices are about filter center axis bilateral symmetry；Incoming feeder and output feeder are about filter center axis bilateral symmetry.The present invention have the advantages that light-weight, small in size, high reliablity, have excellent performance, temperature stability is good, production cost is low etc., be suitable for the multiple services modern wireless communication systems of multiband under different operating environment.
Description
Technical field
The present invention relates to electrically tunable bandpass filters technologies, and in particular to a kind of independent electrical Tunable dual band bandpass filter.
Background technique
In recent years, with the development of mobile communication, frequency spectrum resource becomes more and more nervous, in order to increase channel quantity usually
It is required that the frequency range that extension is new, the communication that can be compatible with double/multiband becomes the trend of development.It is generally required in this way by different nothings
Wire module is integrated into same mobile terminal, is enabled the terminal to work at the same time in multiple and different frequencies, will necessarily be reduced
The utilization rate in space.
Compared to the multiband filter for possessing fixed-bandwidth, the more convenient and fast tunable filter of frequency band adjustments is as filter
One of important kind, had been widely used in civilian and military communication equipment at this stage.Many researchers tend to use
The single lesser tunable optic filter of size replaces traditional filter group, while reducing RF transceiver volume,
The power consumption and cost for reducing filter meet the main trend of the miniaturization of present receiving machine RF front-end circuit, low cost, because
The development of fast tunable filter is greatly facilitated in this.
A kind of great one kind that proposes in " design of double frequency-band Independent adjustable bandpass filter " of the mirror of Shanghai University is by adding
The tunable filter that the step electric impedance resonator (SIR) and bimodulus split-ring resonator for carrying both-end short circuit minor matters are constituted, the filtering
The bandwidth of operation of the first passband of device is relatively narrow, and relative bandwidth is less than 5%.Southwest Jiaotong University it is abundant it is sharp " be applied to WLAN&
The adjustable double-passband filter of miniaturization SIR of WiMAX " in propose it is a kind of by two symmetrical step impedance resonators form can
The relative bandwidth of tunable filter, two passbands is relatively narrow, and only 6.3% and 5.4%.
Summary of the invention
The purpose of the present invention is to provide a kind of independent electrical Tunable dual band bandpass filters.
Realize the technical solution of the object of the invention are as follows: a kind of independent electrical Tunable dual band bandpass filter, including dielectric-slab, connect
Floor, the first quarter-wave resonance device, the second quarter-wave resonance device, the resonator of short-circuit minor matters load, input
Feeder line, output feeder and outer circuits, the first quarter-wave resonance device, the second quarter-wave resonance device, short circuit
Resonator, incoming feeder, output feeder and the outer circuits of minor matters load are arranged at the upper surface of medium substrate, and earth plate is set
It sets in the lower surface of medium substrate；
For the resonator of the short-circuit minor matters load about filter center axis bilateral symmetry, two quarter-waves are humorous
The left and right ends of short-circuit minor matters load resonator, the first quarter-wave resonance device and the second quarter-wave is arranged in vibration device
Long resonator is about filter center axis bilateral symmetry；Incoming feeder be built in short-circuit minor matters load resonator and the one or four/
Between one wave resonator, output feeder be built in short-circuit minor matters load resonator and the second quarter-wave resonance device it
Between, incoming feeder and output feeder are about filter center axis bilateral symmetry；The outer circuits include the first capister
With the second capister, the first capister is connect with the open end of two quarter-wave resonance devices, the second transfiguration
Diode is connect with the open end of short-circuit minor matters load resonator.
Compared with prior art, the present invention its remarkable advantage are as follows: (1) compare existing tunable filter, the present invention is into one
Step has widened bandwidth of operation；(2) present invention has lesser insertion loss and biggish return loss；(3) present invention has good
Isolation between good selectivity and passband；(4) present invention has used quarter-wave resonance device and short-circuit minor matters line to add simultaneously
Resonator is carried, after respectively plus capister circuit, the independent electrical for realizing dual-passband is adjustable；(5) master of the invention
Wanting working frequency is 1.9GHz and 2.4GHz, while being suitable for GMS frequency range and LTE frequency range, meets current mainstream mobile communication system
System RF front-end circuit demand for development.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of independent electrical Tunable dual band bandpass filter of the present invention.
Fig. 2 is the scale diagrams of independent electrical Tunable dual band bandpass filter of the present invention.
Fig. 3 is the S parameter curve graph of independent electrical Tunable dual band bandpass filter of the present invention.
Fig. 4 is independent electrical Tunable dual band bandpass filter of the present invention S when changing C221The change curve of parameter.
Fig. 5 is independent electrical Tunable dual band bandpass filter of the present invention S when changing C121The change curve of parameter.
Fig. 6 is independent electrical Tunable dual band bandpass filter of the present invention S in the case where C1 and C2 are changed simultaneously21The change of parameter
Change curve graph.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing.
In conjunction with Fig. 1, a kind of independent electrical Tunable dual band bandpass filter, including dielectric-slab, earth plate, the first quarter-wave
Long resonator, the second quarter-wave resonance device, the resonator of short-circuit minor matters load, incoming feeder, output feeder and outer
Circuits, the first quarter-wave resonance device, the second quarter-wave resonance device, the load of short-circuit minor matters resonator, defeated
Enter the upper surface that feeder line, output feeder and outer circuits are arranged at medium substrate, the following table of medium substrate is arranged in earth plate
Face；
For the resonator of the short-circuit minor matters load about filter center axis bilateral symmetry, two quarter-waves are humorous
The left and right ends of short-circuit minor matters load resonator, the first quarter-wave resonance device and the second quarter-wave is arranged in vibration device
Long resonator is about filter center axis bilateral symmetry；Incoming feeder be built in short-circuit minor matters load resonator and the one or four/
Between one wave resonator, output feeder be built in short-circuit minor matters load resonator and the second quarter-wave resonance device it
Between, incoming feeder and output feeder are about filter center axis bilateral symmetry；The outer circuits include the first capister
With the second capister, the first capister is connected to the open end of two quarter-wave resonance devices, the second transfiguration two
Grade pipe is connected to the open end of short-circuit minor matters load resonator.
First quarter-wave resonance device includes sequentially connected first microstrip line 1, the second microstrip line 2 and third micro-strip
Line 3, the first microstrip line 1 and third microstrip line 3 are parallel to each other, and all vertical with the second microstrip line 2；Second quarter-wave
Resonator includes sequentially connected 4th microstrip line 4, the 5th microstrip line 5 and the 6th microstrip line 6, and the 4th microstrip line 4 and the 6th is micro-
Band line 6 is parallel to each other, and all vertical with the 5th microstrip line 5；The open end of both first microstrip line 1 and the 4th microstrip line 4 with
First varactor is connected；Third microstrip line 3 and the 6th microstrip line 6 ground connection.
First varactor includes first resistor R1 and first capacitor C1, and one end of first resistor R1 is micro- with first simultaneously
It is connected with line 1 with the open end of the 4th microstrip line 4, another termination first voltage V1 of first resistor R1；The one of first capacitor C1
End is connect with the open end of the first microstrip line 1 and the 4th microstrip line 4 simultaneously, the other end ground connection of first capacitor C1.
The short circuit minor matters load resonator is by the 7th microstrip line 7, the 8th microstrip line 8, the 9th microstrip line 9 and the tenth micro-strip
Line 10 forms, and the 7th microstrip line 7, the 8th microstrip line 8 and the tenth microstrip line 10 are sequentially connected, the 7th microstrip line 7, the 9th microstrip line
9 and the tenth microstrip line 10 be parallel to each other and all vertical with the 8th microstrip line 8, the 9th microstrip line 9 and filter center overlapping of axles, the
One end of nine microstrip lines 9 is connect with 8 midpoint of the 8th microstrip line, other end ground connection；7th microstrip line 7 and the tenth microstrip line 10 are opened
Terminal is connect with the second capister.
Second varactor includes second resistance R2 and the second capacitor C2, and one end of second resistance R2 is simultaneously with the
Seven microstrip lines 7 are connected with the open end of the tenth microstrip line 10, another termination second voltage V2 of second resistance R2；Second capacitor C2
One end connect simultaneously with the open end of the 7th microstrip line 7 and the tenth microstrip line 10, the other end of the second capacitor C2 is grounded.
The incoming feeder includes sequentially connected 11st microstrip line 11, the 12nd microstrip line 12, the 13rd microstrip line
13, the 14th microstrip line 14 and the 15th microstrip line 15；11st microstrip line 11 is parallel with the 13rd microstrip line 13, and the 11st is micro-
Band line 11 and the 12nd microstrip line 12, the 14th microstrip line 14 and the 15th microstrip line 15 are vertical；15th microstrip line 15 is wide
Degree is greater than 14 width of the 14th microstrip line, and the 14th microstrip line 14 and the 15th microstrip line 15 are located at same horizontal line；11st
Microstrip line 11 is parallel with the 7th microstrip line 7, and the 12nd microstrip line 12 is parallel with the second microstrip line 2, the 13rd microstrip line 13 and
Three microstrip lines 3 are parallel；
Output feeder includes sequentially connected 16th microstrip line 16, the 17th microstrip line 17, the 18th microstrip line 18,
19 microstrip lines 19 and the 20th microstrip line 20；16th microstrip line 16 is parallel with the 18th microstrip line 18, the 16th microstrip line
16 is vertical with the 17th microstrip line 17, the 19th microstrip line 19 and the 20th microstrip line 20；20th microstrip line, 20 width is big
In 19 width of the 19th microstrip line, the 19th microstrip line 19 and the 20th microstrip line 20 are located at same horizontal line；16th micro-strip
Line 16 is parallel with the tenth microstrip line 10, and the 17th microstrip line 17 is parallel with the 5th microstrip line 5, the 18th microstrip line 18 and the 6th micro-
Band line 6 is parallel.
15th microstrip line 15 and the 20th microstrip line 20 are 50 ohm of characteristic impedance of microstrip line.
By adjusting the length and spacing of coupling unit and input and output feedback between two quarter-wave resonance devices
Coupling length between line and resonator obtains preferable transmission zero response, to improve the selectivity and passband of filter
Between isolation.
The present invention is further explained in the light of specific embodiments.
Embodiment
Structure such as Fig. 1 institute of independent electrical Tunable dual band bandpass filter of the present embodiment based on minor matters line load resonator
Show, dimensions is as shown in Figure 2.Used dielectric-slab is Rogers RT/duroid 5880, with a thickness of 0.508mm, relatively
Dielectric constant is 2.2, loss angle tangent 0.0009.The dimensional parameters of each microstrip line of filter are as follows: W1=0.3mm, W2=
0.6mm, S1=0.1mm, S2=0.1mm, S3=0.16mm, L1=28.15mm, L2=22mm, L3=1.5mm, D=
34.5mm.The width of 50 ohm of input and output feeder lines is 1.54mm, and the microstrip line area of filter is 18.9 × 26.5mm2, right
The guide wavelength answered is having a size of 0.168 λg×0.235λg, wherein λgFor the corresponding guide wavelength of the first passband central frequency.Selection with
The length and width of upper microstrip line, to obtain optimal transmitted in band characteristic, out-of band rejection characteristic, band selective and frequency
Interband isolation.
Fig. 3 is the independent electrical Tunable dual band bandpass filter emulation knot based on minor matters line load resonator in the present embodiment
Fruit curve graph.Wherein, S11Indicate return loss, S21Indicate insertion loss.It can be seen from the figure that the center frequency of two passbands
Rate is respectively 1.9GHz and 2.4GHz, and the insertion loss of each passband is respectively 0.16dB and 0.20dB, the return loss of each passband
Respectively 20dB and 23.3dB, the 3dB relative bandwidth of each passband are respectively 17.9% and 9.2%.
Fig. 4 is that the independent electrical Tunable dual band bandpass filter based on minor matters line load resonator in the present embodiment is not changing
In the case where becoming C1, the simulation result curve graph of varactor C2 is adjusted.In the case where resonator electric size is certain, transmission
Zero point respective frequencies size and capacitor are inversely proportional, that is, when increase capister capacitor, corresponding cutoff frequency reduces,
The corresponding frequency of transmission zero will also reduce, to realize adjustable process.It can be seen from the figure that the case where not changing C1
Under, by adjusting the size of C2, the resonance frequency of passband one does not change, and the resonance frequency of passband two is with the reduction of C2
It constantly moves to right, constantly moves to right from the 2.5GHz of virgin work to 2.65GHz, translation bandwidth is 150MHz.Translate preceding second passband
Insertion loss be 0.19dB, relative bandwidth 11.8%, insertion loss is 0.18dB after passband translation, and relative bandwidth is
10.4%.Experimental result achieves the desired results.
Fig. 5 is that the independent electrical Tunable dual band bandpass filter based on minor matters line load resonator in the present embodiment is not changing
In the case where becoming C2, the simulation result curve graph of varactor C1 is adjusted.It can be seen from the figure that the case where not changing C2
Under, by adjusting the size of C1, the resonance frequency of passband two does not change, and the resonance frequency of passband one is with the reduction of C1
It constantly moves to right, constantly moves to right from the 1.95GHz of virgin work to 2.15GHz, translation bandwidth is 200MHz.Translate preceding first passband
Insertion loss be 0.14dB, relative bandwidth 20%, insertion loss is 0.73dB after passband translation, and relative bandwidth is
11.6%.Experimental result achieves the desired results.While increasing capister capacitor, corresponding resonance frequency reduces,
But smaller working frequency translation similar frequency bands need bigger diode capacitance amplification, thus, to guarantee the identical of two passbands
Amplification need to increase adjustment amplitude when changing C1, guarantee experiment effect.
Fig. 6 is to load the independent electrical Tunable dual band bandpass filter of resonator at the same time based on minor matters line in the present embodiment
In the case where changing C1, C2, the simulation result curve graph of the filter.It can be seen from the figure that changing C1, C2 capacitance at the same time
When, the resonance frequency of two passbands moves to right simultaneously therewith.Passband one from the 1.9GHz of virgin work constantly move to right to
2.15GHz, translation bandwidth are 250MHz, and passband two is constantly moved to right from the 2.4GHz of virgin work to 2.6GHz, translate bandwidth and are
200MHz.The insertion loss for translating preceding first passband is 0.16dB, relative bandwidth 18.4%, insertion loss after passband translation
For 0.73dB, relative bandwidth 12.1%.The insertion loss for translating preceding second passband is 0.2dB, and relative bandwidth 14.2% is led to
Insertion loss is 0.31dB, relative bandwidth 9.6% after band translation.Experimental result achieves the desired results.
The present invention realize bilateral electrification it is adjustable simultaneously, mutually relatively before tunable filter, have broader work belt
Width, smaller insertion loss, bigger return loss reach experiment and are expected.
The above description is only an embodiment of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (5)
1. a kind of independent electrical Tunable dual band bandpass filter, it is characterised in that: including dielectric-slab, earth plate, the first a quarter
Wave resonator, the second quarter-wave resonance device, the resonator of short-circuit minor matters load, incoming feeder, output feeder and
Outer circuits, the first quarter-wave resonance device, the second quarter-wave resonance device, the load of short-circuit minor matters resonator,
Incoming feeder, output feeder and outer circuits are arranged at the upper surface of medium substrate, and earth plate is arranged under medium substrate
Surface；
The resonator of the short-circuit minor matters load is about filter center axis bilateral symmetry, two quarter-wave resonance devices
The left and right ends of short-circuit minor matters load resonator are set, and the first quarter-wave resonance device and the second quarter-wave are humorous
Device shake about filter center axis bilateral symmetry；Incoming feeder is built in short-circuit minor matters load resonator and the first quarter-wave
Between long resonator, output feeder is built between short-circuit minor matters load resonator and the second quarter-wave resonance device, defeated
Enter feeder line and output feeder about filter center axis bilateral symmetry；The outer circuits include the first capister and second
Capister, the first capister are connect with the open end of two quarter-wave resonance devices, the second capister
It is connect with the open end of short-circuit minor matters load resonator；
The short circuit minor matters load resonator is micro- by the 7th microstrip line (7), the 8th microstrip line (8), the 9th microstrip line (9) and the tenth
Band line (10) forms, and the 7th microstrip line (7), the 8th microstrip line (8) and the tenth microstrip line (10) are sequentially connected, the 7th microstrip line
(7), the 9th microstrip line (9) and the tenth microstrip line (10) are parallel to each other and all vertical with the 8th microstrip line (8), the 9th microstrip line
(9) it is connect with filter center overlapping of axles, one end of the 9th microstrip line (9) with the 8th microstrip line (8) midpoint, other end ground connection；
The open end of 7th microstrip line (7) and the tenth microstrip line (10) is connect with the second capister；
The incoming feeder includes sequentially connected 11st microstrip line (11), the 12nd microstrip line (12), the 13rd microstrip line
(13), the 14th microstrip line (14) and the 15th microstrip line (15)；11st microstrip line (11) and the 13rd microstrip line (13) are flat
Row, the 11st microstrip line (11) and the 12nd microstrip line (12), the 14th microstrip line (14) and the 15th microstrip line (15) hang down
Directly；15th microstrip line (15) width is greater than the 14th microstrip line (14) width, the 14th microstrip line (14) and the 15th micro-strip
Line (15) is located at same horizontal line；11st microstrip line (11) is parallel with the 7th microstrip line (7), the 12nd microstrip line (12) and the
In parallel, the 13rd microstrip line (13) is parallel with third microstrip line (3) for two microstrip lines (2)；
Output feeder include sequentially connected 16th microstrip line (16), the 17th microstrip line (17), the 18th microstrip line (18),
19th microstrip line (19) and the 20th microstrip line (20)；16th microstrip line (16) is parallel with the 18th microstrip line (18), the
16 microstrip lines (16) and the 17th microstrip line (17), the 19th microstrip line (19) and the 20th microstrip line (20) are vertical；The
20 microstrip lines (20) width is greater than the 19th microstrip line (19) width, the 19th microstrip line (19) and the 20th microstrip line (20)
Positioned at same horizontal line；16th microstrip line (16) is parallel with the tenth microstrip line (10), the 17th microstrip line (17) and the 5th micro-
In parallel, the 18th microstrip line (18) is parallel with the 6th microstrip line (6) for band line (5).
2. independent electrical Tunable dual band bandpass filter according to claim 1, it is characterised in that: the first quarter-wave
Resonator includes sequentially connected first microstrip line (1), the second microstrip line (2) and third microstrip line (3), the first microstrip line (1)
It is parallel to each other with third microstrip line (3), and all vertical with the second microstrip line (2)；Second quarter-wave resonance device includes
Sequentially connected 4th microstrip line (4), the 5th microstrip line (5) and the 6th microstrip line (6), the 4th microstrip line (4) and the 6th micro-strip
Line (6) is parallel to each other, and all vertical with the 5th microstrip line (5)；Both first microstrip line (1) and the 4th microstrip line (4) are opened
Terminal is connected with the first varactor；Third microstrip line (3) and the 6th microstrip line (6) ground connection.
3. independent electrical Tunable dual band bandpass filter according to claim 2, which is characterized in that the first varactor packet
Include first resistor (R1) and first capacitor (C1), one end of first resistor (R1) simultaneously with the first microstrip line (1) and the 4th micro-strip
The open end of line (4) connects, another termination first voltage (V1) of first resistor (R1)；One end of first capacitor (C1) simultaneously with
First microstrip line (1) is connected with the open end of the 4th microstrip line (4), the other end ground connection of first capacitor (C1).
4. independent electrical Tunable dual band bandpass filter according to claim 1, it is characterised in that: two pole of the second transfiguration
Pipe includes second resistance (R2) and the second capacitor (C2), one end of second resistance (R2) and meanwhile with the 7th microstrip line (7) and the tenth
The open end of microstrip line (10) connects, another termination second voltage (V2) of second resistance (R2)；One end of second capacitor (C2)
It is connect simultaneously with the open end of the 7th microstrip line (7) and the tenth microstrip line (10), the other end ground connection of the second capacitor (C2).
5. independent electrical Tunable dual band bandpass filter according to claim 1, it is characterised in that: the 15th microstrip line (15)
It is 50 ohm of characteristic impedance of microstrip line with the 20th microstrip line (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610165566.9A CN105680128B (en) | 2016-03-19 | 2016-03-19 | Independent electrical Tunable dual band bandpass filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610165566.9A CN105680128B (en) | 2016-03-19 | 2016-03-19 | Independent electrical Tunable dual band bandpass filter |
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| CN105680128B true CN105680128B (en) | 2019-01-04 |
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Cited By (1)
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| RU2713719C1 (en) * | 2019-04-25 | 2020-02-06 | Акционерное общество "Научно-производственное предприятие "Исток" имени А.И. Шокина" (АО "НПП "Исток" им. Шокина") | Microwave filter |
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| CN106785261B (en) * | 2017-01-09 | 2019-08-09 | 华东交通大学 | A kind of adjustable bandpass filter of narrowband trap |
| CN108110388B (en) * | 2017-12-12 | 2020-06-26 | 中国船舶重工集团公司第七一九研究所 | Constant bandwidth broadband filter with electrically-adjusted transmission zero |
| CN113054416B (en) * | 2021-04-02 | 2022-12-09 | 西安电子科技大学 | Liquid metal reconfigurable antenna feed circuit |
| CN115189108B (en) * | 2022-08-08 | 2023-10-20 | 河南科技大学 | Double-passband filter based on multimode resonator |
| CN115425376B (en) * | 2022-09-29 | 2023-09-08 | 河南科技大学 | Double-passband filter based on branch loading |
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| RU2713719C1 (en) * | 2019-04-25 | 2020-02-06 | Акционерное общество "Научно-производственное предприятие "Исток" имени А.И. Шокина" (АО "НПП "Исток" им. Шокина") | Microwave filter |
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