CN109524749A - A kind of double-passband filter with trap characteristic - Google Patents
A kind of double-passband filter with trap characteristic Download PDFInfo
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- CN109524749A CN109524749A CN201811405446.7A CN201811405446A CN109524749A CN 109524749 A CN109524749 A CN 109524749A CN 201811405446 A CN201811405446 A CN 201811405446A CN 109524749 A CN109524749 A CN 109524749A
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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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- H01P1/20336—Comb or interdigital filters
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Abstract
The present invention provides a kind of double-passband filter with trap characteristic.The double-passband filter includes symmetrically arranged first pair of step impedance resonator and second pair of step impedance resonator, symmetrically arranged first trap wave unit and the second trap wave unit and symmetrically arranged incoming feeder structure and output feeder structure.Incoming feeder structure and output feeder structure respectively with first pair of step impedance resonator and second pair of step impedance resonator slot-coupled, to provide electromagnetic excitation.First pair of step impedance resonator and second pair of step impedance resonator slot-coupled, to generate the first passband and the second passband of double-passband filter in the case where electromagnetic excitation acts on.First trap wave unit and the second trap wave unit respectively with first pair of step impedance resonator and second pair of step impedance resonator slot-coupled, to generate the trap in the first passband in the case where electromagnetic excitation acts on.The present invention introduces trap in one of dual-passband, effectively inhibits interfering frequency in passband.
Description
Technical field
Disclosed embodiment of the invention is related to technology for radio frequency field, and more specifically, is related to a kind of with sunken
The double-passband filter of wave property.
Background technique
With the fast development of mobile communication, various kinds of mobile communication system is simultaneously deposited, so that often existing in practical applications
Occur the frequency signal of different mobile communication system in same working frequency range, therefore, needs working in some communication system
Inhibit the interfering frequency signal of other communication systems in frequency range.Meanwhile system needs received often several non-conterminous frequencies
Signal.
At present inhibit passband in interfering frequency main method first is that in the band-pass filter integrate bandstop filter, but
It is that this design method is complicated, specific implementation is difficult, and structure is complicated, and circuit area is big and is not easy to circuit integration.Meanwhile
If system uses traditional single-pass band filter, which needs a job in the radio-frequency front-end device of multiple frequency ranges
Part, this undoubtedly increases the volume of equipment.In addition, few researchs and application press down high temperature superconductor technology and radio frequency interference at present
Technology processed is combined to design the multi-pass band high temperature superconduction wave filter with trap performance.
Summary of the invention
In view of this, the present invention proposes a kind of double-passband filter with trap characteristic to solve the above problems.
The dual-passband that there is provided a kind of with the trap characteristic filter of technical solution used by the present invention solves the above problems
Wave device.The double-passband filter include symmetrically arranged first pair of step impedance resonator and second pair of step impedance resonator,
Symmetrically arranged first trap wave unit and the second trap wave unit and symmetrically arranged incoming feeder structure and output feeder structure.
Symmetrically arranged incoming feeder structure and output feeder structure are hindered with first pair of step impedance resonator and second pair of step respectively
Antiresonance device slot-coupled, to provide electromagnetic excitation to double-passband filter.Symmetrically arranged first pair of step impedance resonator
With second pair of step impedance resonator slot-coupled, in the case where electromagnetic excitation acts on generate double-passband filter the first passband and
Second passband.First trap wave unit and the second trap wave unit respectively with first pair of step impedance resonator and second pair of Stepped Impedance
Resonator slot-coupled, to generate the trap in the first passband in the case where electromagnetic excitation acts on.
Wherein, first pair of step impedance resonator and second pair of step impedance resonator are that symmetrical double Stepped Impedances are humorous
Shake device；Double step impedance resonators include the first Stepped Impedance device, the second step impedor and stub, wherein stub
Both ends are connect with the first Stepped Impedance device and the second step impedor respectively, and the first Stepped Impedance device and the second step impedor
It is symmetrical arranged.
Wherein, the first Stepped Impedance device and the second step impedor are symmetrical Stepped Impedance device；Stepped Impedance device packet
The first impedance part, the second impedance part and third impedance part are included, wherein the first impedance part and third impedance part are symmetrical arranged, and first
Equivalent impedance of the equivalent impedance of impedance part or third impedance part less than the second impedance part.
Wherein, the both ends of stub are connected to one end and the second step of the second impedance part of the first Stepped Impedance device
One end of second impedance part of impedor.
Wherein, the second impedance part is by bending process twice, so that Stepped Impedance device is U-shaped.
Wherein, the first trap wave unit and the second trap wave unit are symmetrical arranged about the first diagonal line；And incoming feeder knot
Structure and output feeder structure are symmetrical arranged about the second diagonal line, wherein the first diagonal line and the intersection of the second diagonal line.
Wherein, the first trap wave unit is from one end of first pair of step impedance resonator along first pair of step impedance resonator
Extend and first pair of step impedance resonator slot-coupled；The other end of second trap wave unit from second pair of step impedance resonator
Extend and second pair of step impedance resonator slot-coupled along second pair of step impedance resonator；Incoming feeder structure and output
One in feeder line structure with the other end slot-coupled of first pair of step impedance resonator, another and second pair of Stepped Impedance
One end slot-coupled of resonator, to provide electromagnetic excitation.
Wherein, incoming feeder structure includes the first tap portion, the first feeder line and the second feeder line, wherein the first feeder line and second
One end of feeder line is connect with the first tap portion respectively, and in 90 degree of settings；Output feeder structure includes the second tap portion, third feedback
Line and the 4th feeder line, wherein one end of third feeder line and the 4th feeder line is connect with the second tap portion respectively, and in 90 degree of settings.
Wherein, the first feeder line extends and first pair of step impedance resonator gap coupling along first pair of step impedance resonator
It closes, third feeder line extends and second pair of step impedance resonator slot-coupled along second pair of step impedance resonator；Second feedback
Line is coupled with first pair of step impedance resonator and second pair of step impedance resonator difference partial gap, the 4th feeder line and first
Double step impedance resonators and second pair of step impedance resonator difference partial gap coupling；Wherein the first feeder line or third feeder line
It is different from the resonance frequency of the second feeder line or the 4th feeder line.
Wherein, the first feeder line and third feeder line pass through bending process three times respectively, so that hindering respectively with first pair of step
Antiresonance device and second pair of step impedance resonator partial gap coupling；Second feeder line is with the 4th feeder line respectively by bending twice
Processing, so that being coupled with second pair of step impedance resonator partial gap.
The beneficial effects of the present invention are as follows: being generated by first pair of step impedance resonator and second pair of step impedance resonator
Dual-passband, and by the first trap wave unit and the second trap wave unit respectively with first pair of step impedance resonator and second pair of step
Electric impedance resonator slot-coupled, thus double caused by first pair of step impedance resonator and second pair of step impedance resonator
Trap is introduced in one of passband, being formed, there is the dual-passband of trap characteristic to subtract without additionally increasing notch filter in system
The volume of few system, effectively inhibits interfering frequency in passband.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the double-passband filter according to an embodiment of the present invention with trap characteristic；
Fig. 2 is the structural schematic diagram of a part of the double-passband filter with trap characteristic in Fig. 1；
Fig. 3 is the frequency response curve of the double-passband filter according to an embodiment of the present invention with trap characteristic；
Fig. 4 is the frequency response curve of the notch amplification in Fig. 3.
Specific embodiment
Present specification and claims in the whole text used in certain terms refer to particular elements.Such as the technology of fields
Personnel are it is understood that electronic equipment set manufacturer can refer to the same component using different names.Herein not with title
It distinguishes component, but component is distinguished with function.In following description and claims, term " comprising " is open
Restriction word, therefore it should be interpreted to mean " including but not limited to ... ".In addition, term " coupling " is intended to mean Indirect Electro
Connection is directly electrically connected.Therefore, when a device is coupled to another device, then it is this connection can be directly electrical connection or
The indirect electrical connection realized by other devices and interconnecting piece.
As shown in Figure 1, being the structural schematic diagram of the double-passband filter according to an embodiment of the present invention with trap characteristic.
The double-passband filter 100 includes symmetrically arranged first pair of step impedance resonator 130 and second pair of step impedance resonator
140, symmetrically arranged first trap wave unit 150 and the second trap wave unit 160 and symmetrically arranged 110 and of incoming feeder structure
Output feeder structure 120.
First pair of step impedance resonator 130 and second pair of step impedance resonator 140, the first trap wave unit 150 and
Two trap wave units 160 and being symmetrical arranged for incoming feeder structure 110 and output feeder structure 120 can set according to actual circuit
Meter considers to be configured.In the present embodiment, first pair of step impedance resonator 130 and second pair of step impedance resonator 140
In horizontal setting symmetrical above and below.In other embodiments, first pair of step impedance resonator 130 and second pair of Stepped Impedance resonance
Device 140 perpendicular can also be symmetrical set, or be symmetrical arranged about a parallax.
Symmetrically arranged incoming feeder structure 110 and output feeder structure 120 respectively with first pair of step impedance resonator
130 and second pair of 140 slot-coupled of step impedance resonator, to provide electromagnetic excitation to double-passband filter 100.
Symmetrically arranged first pair of step impedance resonator 130 and second pair of 140 slot-coupled of step impedance resonator, with
The first passband 310 and the second passband 320 of double-passband filter 100 are generated under electromagnetic excitation effect.Wherein the second passband 320
Center resonant frequency be greater than first passage 310 center resonant frequency.
First trap wave unit 150 and the second trap wave unit 160 respectively with first pair of step impedance resonator 130 and second pair
140 slot-coupled of step impedance resonator, to generate the trap 330 in the first passband 310 in the case where electromagnetic excitation acts on.
In the present embodiment, it is generated by first pair of step impedance resonator 130 and second pair of step impedance resonator 140
Dual-passband, and by the first trap wave unit 150 and the second trap wave unit 160 in first pair of step impedance resonator 130 and second
Trap is introduced in one of dual-passband caused by double step impedance resonators 140, is formed the dual-passband with trap characteristic, is not necessarily to
Additionally increase notch filter in system, reduce the volume of system, effectively inhibits interfering frequency in passband.
It is described in detail below with reference to various pieces of Fig. 2-Fig. 4 to the double-passband filter 100 with trap characteristic.
It should be noted that solid line is reflex response curve S11 in Fig. 3, dotted line is transmission response curve S21, Frequency table
Show frequency, Magnitude indicates amplitude.
First pair of step impedance resonator 130 and second pair of 140 slot-coupled of step impedance resonator generate the first passband
310 and second passband 320.In one embodiment, first pair of step impedance resonator 130 and second pair of step impedance resonator
140 be symmetrical double step impedance resonators 200.As shown in Fig. 2, be first pair of step impedance resonator 130 in Fig. 1 or
The structural schematic diagram of second pair of step impedance resonator 140.Specifically, double step impedance resonators 200 are hindered including the first step
Anti- device 210, the second step impedor 230 and stub 220, wherein the both ends of stub 220 respectively with the first Stepped Impedance device
210 and second step impedor 230 connect, and the first Stepped Impedance device 210 and the second step impedor 230 are symmetrical arranged.Into
One step, the first Stepped Impedance device 210 and the second step impedor 230 are symmetrical set about stub 220.
In one embodiment, since the first Stepped Impedance device 210 and the second step impedor 230 are symmetrical arranged, then the
One step impedor 210 and the second step impedor 230 are symmetrical Stepped Impedance device.The Stepped Impedance device is half-wavelength rank
Jump impedor, is made of half-wavelength microstrip line.Specifically, Stepped Impedance device includes the first impedance part 211, the second impedance part 212
With third impedance part 213, wherein the first impedance part 211 is symmetrical arranged with third impedance part 213.In the present embodiment, the first resistance
The equivalent impedance of anti-portion 211 or third impedance part 213 less than the second impedance part 212 equivalent impedance, and the first impedance part 211 or
The equivalent electrical length of third impedance part 213 is equal to the equivalent electrical length of the second impedance part 212.In other embodiments, the first resistance
The equivalent impedance of anti-portion 211 or third impedance part 213 can also be greater than the equivalent impedance of the second impedance part 212.In order to adjust
The centre frequency of one passband 310 and the second passband 320, adjustable first impedance part 211 or third impedance part 213 and the second resistance
The ratio between the equivalent electrical length in anti-portion 212.It should be noted that the first Stepped Impedance device 210 and the second step impedor 230 are phase
Same Stepped Impedance device, therefore, for sake of simplicity, label only is carried out to the first Stepped Impedance device 210 in Fig. 2, it is to be understood that
, the second step impedor 230 is equally applicable to the label of the first Stepped Impedance device 210.
In one embodiment, the both ends of stub 220 are connected to the second impedance part of the first Stepped Impedance device 210
One end of second impedance part 212 of 212 one end and the second step impedor 230, thus the third of the first Stepped Impedance device 210
Impedance part 213 is disposed adjacent with the first impedance part 211 of the second step impedor 230, and is set side by side along its long side.One
In a embodiment, the equivalent impedance of stub 220 is identical as the equivalent impedance of the second impedance part 212.
In one embodiment, the second impedance part 212 is by bending process twice, so that Stepped Impedance device is U-shaped.The
After second impedance part 212 of one step impedor 210 and the second step impedor 230 carries out bending process twice respectively, such as Fig. 1
Shown, symmetrically arranged first pair of step impedance resonator 130 and second pair of step impedance resonator 140 substantially occupy rectangle
Region.
First trap wave unit 150 and the second trap wave unit 160 respectively with first pair of step impedance resonator 130 and second pair
140 slot-coupled of step impedance resonator generates the trap 330 in the first passband 310.In one embodiment, the first trap
Unit 150 and the second trap wave unit 160 are symmetrical arranged about the first diagonal line.Incoming feeder structure 110 and output feeder structure
120 are symmetrical arranged about the second diagonal line, wherein the first diagonal line and the intersection of the second diagonal line.It should be noted that first pair
Linea angulata and the second diagonal line are considered as symmetrically arranged first pair of step impedance resonator 130 and second pair of Stepped Impedance resonance
Occupied rectangular two diagonal lines of device 140.
First trap wave unit 150 and the second trap wave unit 160 are identical half-wavelength uniform impedance resonator.Wherein,
One trap wave unit 150 from one end of first pair of step impedance resonator 130 along the first pair of step impedance resonator 130 extend with
First pair of 130 slot-coupled of step impedance resonator.The of first trap wave unit 150 and first pair of step impedance resonator 130
The coupling of one step impedor, 210 partial gap and the whole slot-coupleds of the second step impedor 230.Further, the first trap
213 slot-coupled of the second impedance part 212 and third impedance part of unit 150 and the first Stepped Impedance device 210.
The other end of second trap wave unit 160 from second pair of step impedance resonator 140 is humorous along second pair of Stepped Impedance
The device 140 that shakes extends and second pair of 140 slot-coupled of step impedance resonator.Second trap wave unit 160 and second pair of Stepped Impedance
The whole slot-coupleds of the first Stepped Impedance device 210 of resonator 140 are coupled with 230 partial gap of the second step impedor.Into one
Step ground, the 212 gap coupling of the first impedance part 211 and the second impedance part of the second trap wave unit 160 and the second step impedor 230
It closes.
Due between the first trap wave unit 150 and first pair of step impedance resonator 130 coupled characteristic and second fall into
The coupled characteristic of wave unit 160 and second pair of step impedance resonator 140, and first pair of step impedance resonator 130 and second
Coupling feature between double step impedance resonators 140, the first trap wave unit 150 and the second trap wave unit 160 are formed by sunken
A transmission zero is generated in wave 330 respectively, as shown in figure 4, i.e. transmission zero 331 and transmission zero 332, can inhibit very well
Frequency in one passband 310 in this trap 330.Simultaneously as first pair of step impedance resonator 130 and second pair of Stepped Impedance
Resonator 140 and the first trap wave unit 150 and the second trap wave unit 160, the two sides of trap 330 generate a transmission pole respectively
Point, as shown in figure 4, i.e. transmission pole 341 and transmission pole 342 further suppresses to improve the selectivity of trap 330
Frequency in one passband 310.In addition, due to the resonance characteristic of the first trap wave unit 150 and the second trap wave unit 160 itself,
The upper side band of second passband 320 generates a transmission zero respectively, as shown in figure 3, i.e. transmission zero 303 and transmission zero 304.
Incoming feeder structure 110 and output feeder structure 120 are symmetrical arranged about the second diagonal line.In one embodiment
In, one in incoming feeder structure 110 and output feeder structure 120 with the other end of first pair of step impedance resonator 130
Slot-coupled, one end slot-coupled of another and second pair of step impedance resonator 140, to provide electromagnetic excitation.In addition, by
In incoming feeder structure 110 and output feeder structure 120 is symmetrical arranged about the second diagonal line and incoming feeder structure 110
With 120 structure of output feeder structure itself, a transmission zero, such as Fig. 3 are generated between the first passband 310 and the second passband 320
With shown in Fig. 4, i.e. transmission zero 308 improves the isolation characteristic between dual-passband.
It should be noted that since the first step impedance resonator 130 and the second step impedance resonator 140 are symmetrically to set
Set, the other end of one end of first pair of step impedance resonator 130 and the second step impedance resonator 140 be it is opposite, i.e., the
The other end of the other end of one step impedance resonator 130 and the second step impedance resonator 140 is same side.Equally, first
One end of step impedance resonator 130 and one end of the second step impedance resonator 140 are same sides.
Specifically, incoming feeder structure 110 includes the first tap portion 111, the first feeder line 112 and the second feeder line 113, wherein
One end of first feeder line 112 and the second feeder line 113 is connect with the first tap portion 111 respectively, and in 90 degree of settings.Output feeder knot
Structure 120 includes the second tap portion 121, third feeder line 122 and the 4th feeder line 123, wherein third feeder line 122 and the 4th feeder line 123
One end connect respectively with the second tap portion 121, and in 90 degree be arranged.The end face in the first tap portion 111 as input point Pin,
It is fed into electromagnetic signal, the end face in the second tap portion 121 is fed out electromagnetic signal as output point Pout.It is noted that Pin
It is only illustrative with Pout, in other embodiments, the end face in the first tap portion 111 can be used as Pout, and the second tap
The end face in portion 121 is as Pin.
First feeder line 112 extends along first pair of step impedance resonator 130 to be stitched with first pair of step impedance resonator 130
Gap coupling, third feeder line 122 extends along second pair of step impedance resonator 140 to be stitched with second pair of step impedance resonator 140
Gap coupling.
Second feeder line 113 and first pair of step impedance resonator 130 and second pair of step impedance resonator 140 distinguish part
Slot-coupled, the 4th feeder line 123 and first pair of step impedance resonator 130 and second pair of 140 difference portion of step impedance resonator
Divide slot-coupled.
First feeder line 112 or third feeder line 122 are different from the resonance frequency of the second feeder line 113 or the 4th feeder line 123.
In the present embodiment, the incoming feeder structure 110 and output feeder structure 120 are also in the effect of self electromagnetism excitation
Lower generation transmission zero, so that first pair of step impedance resonator 130 and second pair of step impedance resonator 140 be inhibited to be formed
Dual-passband upper side band harmonic wave.Specifically, the first feeder line 112 and third feeder line 122 are mutual under the action of electromagnetic excitation
Coupling, generates a transmission zero in the upper side band of the second passband 320 respectively, as shown in figure 3, i.e. transmission zero 301 and transmission zero
Point 302.Due to incoming feeder structure 110 and output feeder structure 120 is symmetrical arranged about the second diagonal line and incoming feeder
Structure 110 and output feeder structure 120 structure itself, then incoming feeder structure 110 and output feeder structure 120 are in the second passband
320 upper side band generates a transmission zero, as shown in figure 3, i.e. transmission zero 305.First tap portion 111 and the second tap portion
121 intercouple under the action of electromagnetic excitation, a transmission zero are generated respectively in the upper side band of the second passband 320, such as Fig. 3 institute
Show, i.e. transmission zero 306 and transmission zero 307.
As shown in figure 3, transmission zero 301 caused by incoming feeder structure 110 and output feeder structure 120, transmission zero
Point 302, transmission zero 305, transmission zero 306 and transmission zero 307 and the first trap wave unit 150 and the second trap wave unit
Transmission zero 303 and transmission zero 304 caused by 160 reach the harmonics restraint of the double-passband filter 100
7GHz or more, and then the double-passband filter 100 has wider stopband characteristic.
First feeder line 112 passes through bending process three times with third feeder line 122 respectively, so that hindering respectively with first pair of step
Antiresonance device 130 and second pair of 140 partial gap of step impedance resonator coupling.Further, the first feeder line 112 and first pair
211 slot-coupled of the first impedance part of first Stepped Impedance device 210 of step impedance resonator 130, third feeder line 122 and second
213 slot-coupled of third impedance part of second step impedor 230 of double step impedance resonators 140.
Second feeder line 113 and the 4th feeder line 123 are respectively by bending process twice, so that humorous with second pair of Stepped Impedance
140 partial gap of device that shakes couples.Further, the first step of the second feeder line 113 and first pair of step impedance resonator 130 hinders
First impedance of the first Stepped Impedance device 210 of the first impedance part 211 and second pair of step impedance resonator 140 of anti-device 210
211 slot-coupled of portion.The third of second step impedor 230 of the 4th feeder line 123 and first pair of step impedance resonator 130 hinders
213 slot-coupled of third impedance part of second step impedor 230 of anti-portion 213 and second pair of step impedance resonator 140.
Further, in one embodiment, which further includes that high-temperature superconductor medium substrate (does not show
Out), above-mentioned symmetrically arranged first pair of step impedance resonator 130 and second pair of step impedance resonator 140, symmetrically arranged
First trap wave unit 150 and the second trap wave unit 160 and symmetrically arranged incoming feeder structure 110 and output feeder structure
120.That is, the double-passband filter is made of high-temperature superconductor medium substrate, Jie of the high-temperature superconductor medium substrate
Electric constant is 9.78, and with a thickness of 0.5mm, in turn, the loss of the double-passband filter is small, and quality factor are high, at this point, being applied to penetrate
Better effect in the special applications system such as electric astronomical observation, using stabilization, and using of long duration.The high-temperature superconductor medium substrate by
Magnesia is made, and the upper and lower surface of the high-temperature superconductor medium substrate is made of yttrium barium copper oxide superconducting film.Certainly, in other implementations
In example, within the scope of the understanding of those skilled in the art, the band logical can also be made of the medium substrate of other parameters
Filter is not limited thereto.
Those skilled in the art is apparent from, and can make while keeping teachings of the present invention content to device and method
Many modifications and variation.Therefore, above disclosure should be considered as only being limited by the range of appended claim.
Claims (10)
1. a kind of double-passband filter with trap characteristic characterized by comprising
Symmetrically arranged first pair of step impedance resonator and second pair of step impedance resonator, symmetrically arranged first trap list
Member and the second trap wave unit and symmetrically arranged incoming feeder structure and output feeder structure；
Symmetrically arranged incoming feeder structure and output feeder structure respectively with first pair of step impedance resonator and described
Second pair of step impedance resonator slot-coupled, to provide electromagnetic excitation to the double-passband filter；
Symmetrically arranged first pair of step impedance resonator and second pair of step impedance resonator slot-coupled, with
Lower the first passband and second passband for generating the double-passband filter of electromagnetic excitation effect；
First trap wave unit and second trap wave unit respectively with first pair of step impedance resonator and described
Two pairs of step impedance resonator slot-coupleds, to generate the trap in first passband in the case where electromagnetic excitation acts on.
2. as described in claim 1 with the double-passband filter of trap characteristic, which is characterized in that first pair of step
Electric impedance resonator and second pair of step impedance resonator are symmetrical double step impedance resonators；
Double step impedance resonators include the first Stepped Impedance device, the second step impedor and stub, wherein described short
The both ends of transversal are connect with the first Stepped Impedance device and the second step impedor respectively, and first Stepped Impedance
Device and the second step impedor are symmetrical arranged.
3. as described in claim 2 with the double-passband filter of trap characteristic, which is characterized in that the first step resistance
Anti- device and the second step impedor are symmetrical Stepped Impedance device；
The Stepped Impedance device include the first impedance part, the second impedance part and third impedance part, wherein first impedance part with
The third impedance part is symmetrical arranged, and the equivalent impedance of first impedance part or the third impedance part is less than described second
The equivalent impedance of impedance part.
4. as described in claim 3 with the double-passband filter of trap characteristic, which is characterized in that the two of the stub
End is connected to one end of the second impedance part of the first Stepped Impedance device and the second resistance of the second step impedor
The one end in anti-portion.
5. as described in claim 3 with the double-passband filter of trap characteristic, which is characterized in that second impedance part
By bending process twice, so that the Stepped Impedance device is U-shaped.
6. as described in claim 1 with the double-passband filter of trap characteristic, which is characterized in that the first trap list
First and described second trap wave unit is symmetrical arranged about the first diagonal line；And the incoming feeder structure and output feeder structure
It is symmetrical arranged about the second diagonal line, wherein first diagonal line and second diagonal line intersection.
7. as described in claim 6 with the double-passband filter of trap characteristic, which is characterized in that the first trap list
Member extends and described first from one end of first pair of step impedance resonator along first pair of step impedance resonator
Double step impedance resonator slot-coupleds；
Second trap wave unit is from the other end of second pair of step impedance resonator along second pair of Stepped Impedance
Resonator extends and second pair of step impedance resonator slot-coupled；
One in the incoming feeder structure and the output feeder structure another with first pair of step impedance resonator
One end slot-coupled, one end slot-coupled of another and second pair of step impedance resonator, to provide electromagnetic excitation.
8. as described in claim 7 with the double-passband filter of trap characteristic, which is characterized in that the incoming feeder knot
Structure includes the first tap portion, the first feeder line and the second feeder line, wherein one end of first feeder line and second feeder line is distinguished
It is connect with the first tap portion, and in 90 degree of settings；
The output feeder structure includes the second tap portion, third feeder line and the 4th feeder line, wherein the third feeder line and described
One end of 4th feeder line is connect with the second tap portion respectively, and in 90 degree of settings.
9. as described in claim 8 with the double-passband filter of trap characteristic, which is characterized in that first feeder line edge
First pair of step impedance resonator extend and first pair of step impedance resonator slot-coupled, the third feeder line
Extend and second pair of step impedance resonator slot-coupled along second pair of step impedance resonator；
Second feeder line and first pair of step impedance resonator and second pair of step impedance resonator distinguish part
Slot-coupled, the 4th feeder line and first pair of step impedance resonator and second pair of step impedance resonator are distinguished
Partial gap coupling；
Wherein first feeder line or the third feeder line are different from the resonance frequency of second feeder line or the 4th feeder line.
10. as described in claim 9 with the double-passband filter of trap characteristic, which is characterized in that first feeder line
Pass through bending process three times respectively with the third feeder line so that respectively with first pair of step impedance resonator and second
Double step impedance resonator partial gap couplings；
Second feeder line and the 4th feeder line pass through bending process twice respectively, so that with second pair of Stepped Impedance
Resonator parts slot-coupled.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114725635A (en) * | 2022-05-06 | 2022-07-08 | 华东交通大学 | Double-frequency balance filter |
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| CN114725635B (en) * | 2022-05-06 | 2024-01-30 | 华东交通大学 | Dual-frequency balance filter |
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