CN107453014A - The wide upper high common mode inhibition micro-strip balanced duplexer of stopband of high selectivity - Google Patents
The wide upper high common mode inhibition micro-strip balanced duplexer of stopband of high selectivity Download PDFInfo
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- CN107453014A CN107453014A CN201710475409.2A CN201710475409A CN107453014A CN 107453014 A CN107453014 A CN 107453014A CN 201710475409 A CN201710475409 A CN 201710475409A CN 107453014 A CN107453014 A CN 107453014A
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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
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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 the wide upper high common mode inhibition micro-strip balanced duplexer of stopband of high selectivity, including the first balance filter and the second balance filter；First balance filter includes the first wave filter and the second wave filter, second balance filter includes the 3rd wave filter and the 4th wave filter, first wave filter, the second wave filter, the 3rd wave filter and the 4th wave filter include the two parts symmetrically connected, and public same symmetry axis, the symmetry axis are referred to as OO ' axles；Two common nodes are provided between first balance filter and the second balance filter, two common nodes are connected along OO ' axial symmetry, first balance filter with the second balance filter by two common nodes；Straight line where the center of two common nodes is referred to as XX ' axles, and first balance filter and the second balance filter are on XX ' axial symmetry.The effect for improving balanced duplexer selectivity and isolation has been not only acted as, while has also achieved Wide stop bands.
Description
Technical field
The present invention relates to the wide upper high common mode inhibition micro-strip balanced duplexer of stopband of high selectivity, belongs to wireless communication technology neck
Domain.
Background technology
In modern wireless communication systems, balancing device is of increased attention, because balancing device can have
Effect suppresses the noise of ambient noise and internal system.And duplexer is the essential device of communication system equipment, duplex is reduced
Reduction of the volume and cost of device for whole communication system cost has very important meaning.Balanced duplexer is as channel radio
The essential device of letter system, has obtained extensive research in recent years.Balanced duplexer has under difference mode signal excitation
There is filter action, and can effectively suppress noise caused by environment and internal system, thus be widely used in Modern wireless communication
Circuit.High selectivity, high isolation, miniaturization, the Novel balance duplexer of low cost are the active demand in market, and balance double
The inexorable trend of work device development.
The content of the invention
In order to solve above-mentioned problem, the invention discloses a kind of wide upper high common mode inhibition micro-strip of stopband of high selectivity
Balanced duplexer, its concrete technical scheme are as follows：
Micro-strip balanced duplexer, the micro-strip balanced duplexer are arranged on medium substrate, the medium substrate include dielectric substrate,
The upper metal level for being coated on dielectric substrate upper surface and the lower metal layer for being coated on dielectric substrate lower surface, micro-strip balance duplex
Device is arranged in metal level, and the lower metal layer is used to be grounded, including the first balance filter and the second balance filter；
First balance filter includes the first wave filter and the second wave filter,
Second balance filter includes the 3rd wave filter and the 4th wave filter,
First wave filter, the second wave filter, the 3rd wave filter and the 4th wave filter include the two parts symmetrically connected, and
Public same symmetry axis, the symmetry axis are referred to as OO ' axles；
Two common nodes, two common node edges are provided between first balance filter and the second balance filter
OO ' axial symmetry, first balance filter are connected with the second balance filter by two common nodes；
Straight line where the center of two common nodes is referred to as XX ' axles, and first balance filter and the second balance filter close
In XX ' axial symmetry.
First balance filter uses stepping electric impedance resonator SIR, forms the first passband, the center frequency of the first passband
Rate is 2.4GHz；Second balance filter uses stepping electric impedance resonator SIR, forms the second passband, the center frequency of the second passband
Rate is 2.6GHz.
First wave filter and the 3rd wave filter are connected by a common node, the feedback of common node connection first
Line, the first feeder terminal form public port, and the public port is the first port of balanced duplexer；
Second wave filter and the 4th wave filter are connected by another common node, and the common node connects the 4th feeder line,
4th feeder terminal forms public port, and the public port is the 4th port of balanced duplexer.
First wave filter includes the first resonator and the second resonator, and the second wave filter includes the 3rd resonator and the
Four resonators, the 3rd wave filter include the 5th resonator and sixth resonator, and the 4th wave filter includes the 7th resonator and the 8th
Resonator,
Along the symmetrical axial symmetry of same, this is right for first resonator and the second resonator, the 3rd resonator and the 4th resonator
Claim axle to be referred to as YY ' axles, the first resonator and the 3rd resonator, the second resonator and the 4th resonator by open-end Low ESR
Transmission line connects with the high-impedance transmission line of terminal short circuit, close on corresponding to resonator for Low ESR region, close on OO ' axles
For high impedance areas；
Along the symmetrical axial symmetry of same, this is right for the 5th resonator and sixth resonator, the 7th resonator and the 8th resonator
Axle is claimed to be referred to as the Low ESR of ZZ ' axles, the 5th resonator and the 7th resonator, sixth resonator and the 8th resonator by open-end
Transmission line connects with the high-impedance transmission line of terminal short circuit, close on corresponding to resonator for Low ESR region, close on OO ' axles
For high impedance areas；
First resonator, the second resonator, the 5th resonator and sixth resonator successively with the 3rd resonator, the 4th resonance
Device, the 7th resonator and the 8th resonator connect along OO ' axial symmetry.
The periphery of first resonator is provided with the first open circuit minor matters, and the periphery of the 5th resonator is provided with the 3rd
Open circuit minor matters, the first open circuit minor matters connect common node with the 3rd open circuit minor matters,
The periphery of 3rd resonator is provided with the 6th open circuit minor matters, and the periphery of the 7th resonator is provided with the 7th open circuit
Minor matters, the 6th open circuit minor matters connect another common node with the 7th open circuit minor matters.
The periphery of second resonator is provided with the second open circuit minor matters, and the second open circuit minor matters connect the second feeder line,
The end of second feeder line is second port,
The periphery of 4th resonator is provided with the 5th open circuit minor matters, and the 5th open circuit minor matters connect the 5th feeder line, described
The end of 5th feeder line is fifth port,
The periphery of the sixth resonator is provided with the 4th open circuit minor matters, and the 4th open circuit minor matters connect the 3rd feeder line, described
The end of 3rd feeder line is the 3rd port,
The periphery of 8th resonator is provided with the 8th open circuit minor matters, and the 8th open circuit minor matters connect the 6th feeder line, described
The end of 6th feeder line is the 6th port.
First wave filter is under common-mode signal excitation, and the first wave filter and the second wave filter are in connection to open
Road, a both ends open circuit SIR wave filter is thus equivalent to, now the resonant frequency of the first wave filter is believed away from desired differential mode
Number passband, can hardly propagate in the interior common-mode signal of the band of difference mode signal, thus reach the effect of high common mode inhibition.
First balance filter the first wave filter and second wave filter under difference mode signal excitation are in connection
Short circuit, a short at one end SIR wave filter is thus equivalent to, now by adjusting Low ESR region and the height of SIR wave filters
The spacing and feeder line of resistance region are connected to the position in open circuit minor matters, adjust electricity, magnetic coupling coefficient between resonator respectively
Than and open circuit minor matters be located at the electrical length ratio on feeder line both sides, and then produce transmission zero and can control simultaneously its position with
Number, now the first wave filter and the second wave filter are respectively provided with 1 and 3 in the upper stopband of its passband formed and lower stopband
The size of individual transmission zero, the first resonator and the second resonator determines the resonant frequency of the first wave filter, two resonators
Between magnetic coupling realized by high impedance short-circuited transmission line, Low ESR open circuited transmission line is realized and is electrically coupled so that wave filter is overall
With electricity, magnetic hybrid coupled, by the spacing and synchronous adjustment for adjusting the first Low ESR region and the first high impedance areas
Position and common node that two feeder lines are connected in the second open circuit minor matters are connected to the position in the first open circuit minor matters, adjust respectively
Electric coupling coefficient and magnetic coupling coefficient ratio and open circuit minor matters between resonator are located at the electrical length ratio on the second feeder line both sides, enter
And the lower stopband in the first wave filter produces a transmission zero, upper stopband produces two transmission zeros, and controls its position.
Equivalent circuit structure of second balance filter under difference mode signal excitation is identical with the first balance filter,
But size is different, i.e., working frequency is different, and now the 3rd wave filter and the 4th wave filter are short circuit in connection, thus etc.
Imitate and be respectively provided with 3 in the upper stopband of its passband formed and lower stopband for a short at one end SIR wave filter, the 3rd wave filter
The size of individual and 1 transmission zero, the 3rd resonator and the 4th resonator determines the resonant frequency of the second wave filter, and two humorous
Shake device, realizes magnetic coupling by high impedance short-circuited transmission line, Low ESR open circuited transmission line is realized and is electrically coupled so that wave filter is overall
With electricity, magnetic hybrid coupled, by the spacing and synchronous adjustment for adjusting the second Low ESR region and the second high impedance areas
Position and common node that three feeder lines are connected in the 4th open circuit minor matters are connected to the position in the first open circuit minor matters, adjust respectively
Electric coupling coefficient and magnetic coupling ratio and open circuit minor matters between resonator are located at the electrical length ratio on the 3rd feeder line both sides, Jin Er
The lower stopband of first wave filter produces two transmission zeros, and upper stopband produces a transmission zero, and can control its position；
For the first wave filter, equivalent to one open circuit minor matters of the second wave filter, due to the first wave filter and the second wave filter it
Between mutual load effect to generate a new transmission zero in the working band of the second wave filter；Equally, for
For second wave filter, equivalent to one open circuit minor matters of the first wave filter, due to the mutual load effect between two wave filters
So that generating a new transmission zero in the working band of the first wave filter, strengthen the isolation of duplexer.
The present invention operation principle be：
In the present invention, micro-strip balanced duplexer is under the excitation of difference mode signal, the first resonator, the second resonator, the 3rd resonance
Device, the terminal of the 4th resonator are short circuit, and first, second, third and fourth resonator is SIR resonators, and it is equivalent to have two not
With the duplexer of working frequency range；It is the first resonator, the second resonator, the 3rd resonator, the 4th humorous under the excitation of common-mode signal
Shake device terminal be open circuit, the resonant frequency of first, second, third and fourth resonator is away from desired difference mode signal passband, in differential mode
The interior common-mode signal of band of signal can hardly be propagated, and thus reach the effect of high common mode inhibition.
The beneficial effects of the invention are as follows：
The present invention can realize being substantially reduced for resonator surface product using SIR structures, while lift the harmonic frequency of resonator,
Stopband on the width of balanced duplexer can be realized.For the wave filter being made up of SIR, by adjusting Low ESR region and height
The spacing and feeder line of resistance region are connected to the position in open circuit minor matters, can adjust electricity between resonator, magnetic coupling respectively
Coefficient ratio and open circuit minor matters be located at the electrical length ratio on the second feeder line both sides, so produce transmission zero and control its position with
Number.First wave filter of design has one and two transmission zeros, the second filter respectively in the upper stopband of its passband and lower stopband
Ripple device has two and a transmission zero respectively in the upper stopband of its passband and lower stopband, simultaneously as the first and second filtering
Mutual load effect between device so that a new transmission zero is respectively produced in the interior lower section of band of the second and first passband,
The effect for improving balanced duplexer selectivity and isolation has been not only acted as, while has also achieved Wide stop bands.
The present invention realizes the theory of more transmission zeros based on hybrid electromagnetic coupling, devises the biography with multiple close passbands
The high-performance balance filter of defeated zero point, the selectivity of balance filter is effectively improved, and utilizes the balancing filter of design
Device realizes a kind of compact-sized balanced duplexer, with stopband, high common mode inhibition, height on compact-sized, high selectivity, width
The characteristic of isolation, meet the actual demand of communication system.
First, second, third and fourth, five, six, seven, eight resonators of the micro-strip balanced duplexer are SIR structures, can be very
Stopband characteristic on the width of good lifting duplexer；First and second wave filter is in the upper stopband of its passband formed and lower stopband point
Not Dai You 1 and 3 transmission zeros, third and fourth wave filter is respectively provided with 3 in the upper stopband of its passband formed and lower stopband
It individual and 1 transmission zero, can be very good to lift the selectivity of balanced duplexer, while enhance the isolation of balanced duplexer
Degree.
Brief description of the drawings
Fig. 1 is the printed circuit board (PCB) section schematic diagram of the present invention；
Fig. 2 is the structural representation of the present invention；
Fig. 3 is the first wave filter equivalent circuit diagram under common-mode signal of the present invention excitation；
Fig. 4 is the first wave filter equivalent circuit diagram under difference mode signal of the present invention excitation；
Fig. 5 is emulation and the test result of the present invention（Emulation is tested using Agilent N5230C using HFSS softwares
Vector network analyzer）；
Fig. 5 (a) is | Sdd33|,|Sdd13|,|Sdd23| test result,
Fig. 5 (b) is | Sdd12|,|Scc13|,|Scc23|,|Scc12| test result,
Reference title is as follows：
A1：First feeder line；A2：Second feeder line；A3：3rd feeder line, A4：4th feeder line, A5：5th feeder line, A6：6th feeder line,
B1：First resonator；B2：Second resonator；B3：3rd resonator；B4：4th resonator, B5：5th resonator, B6：
Sixth resonator, B7：7th resonator, B8：8th resonator,
C1：First open circuit minor matters；C2：Second open circuit minor matters；C3：3rd open circuit minor matters；C4：4th open circuit minor matters, C5：5th opens
Road minor matters, C6：6th open circuit minor matters, C7：7th open circuit minor matters, C8：8th open circuit minor matters,
D1：Common node,
F1:First Low ESR region；F2:First high impedance areas；F3:Second Low ESR region；F4:Second high impedance areas,
S1：Medium；S2：Substrate upper strata metal；S3：Substrate lower metal,
port1：First port；port2：Second port；port3：3rd port；port4：4th port；port5：5th end
Mouthful；port6：6th port.
Embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated.It should be understood that following embodiments are only
For illustrating the present invention rather than limitation the scope of the present invention.
Fig. 1 is medium substrate of the present invention, and its relative dielectric constant is 2.2, thickness 0.508mm, loss angle
Just it is cut to 0.0009.The dielectric-slab of other specifications can certainly be selected.It has been respectively coated by dielectric substrate S1 upper and lower surface
Upper metal level S2 and lower metal layer S3, wherein balanced duplexer of the present invention is formed at metal level S2, lower metal layer S3 makees
For ground plane.
As shown in Fig. 2 reference title is as follows：A1：First feeder line；A2：Second feeder line；A3：3rd feeder line, A4：The
Four feeder lines, A5：5th feeder line, A6：6th feeder line, B1：First resonator；B2：Second resonator；B3：3rd resonator；B4：
4th resonator, B5：5th resonator, B6：Sixth resonator, B7：7th resonator, B8：8th resonator, C1：First opens
Road minor matters；C2：Second open circuit minor matters；C3：3rd open circuit minor matters；C4：4th open circuit minor matters, C5：5th open circuit minor matters, C6：The
Six open circuit minor matters, C7：7th open circuit minor matters, C8：8th open circuit minor matters, D1：Common node, F1:First Low ESR region；F2:
First high impedance areas；F3:Second Low ESR region；F4:Second high impedance areas, S1：Medium；S2：Substrate upper strata metal；
S3：Substrate lower metal, port1：First port；port2：Second port；port3：3rd port；port4：4th port；
port5：Fifth port；port6：6th port；The present invention includes the first balance filter and the second balance filter.
First balance filter includes the first wave filter and the second wave filter.
Second balance filter includes the 3rd wave filter and the 4th wave filter.
First wave filter, the second wave filter, the 3rd wave filter and the 4th wave filter include two symmetrically connected
Point, and public same symmetry axis, the symmetry axis are referred to as OO ' axles.
Two common nodes, two common nodes are provided between first balance filter and the second balance filter
Along OO ' axial symmetry, first balance filter is connected with the second balance filter by two common nodes.
Straight line where the center of two common nodes is referred to as XX ' axles, first balance filter and the second balancing filter
Device is on XX ' axial symmetry.
First balance filter uses stepping electric impedance resonator SIR, forms the first passband, the center frequency of the first passband
Rate is 2.4GHz；Second balance filter uses stepping electric impedance resonator SIR, forms the second passband, the center frequency of the second passband
Rate is 2.6GHz.
First wave filter and the 3rd wave filter are connected by a common node, the feedback of common node connection first
Line, the first feeder terminal form public port, and the public port is the first port of balanced duplexer.
Second wave filter and the 4th wave filter are connected by another common node, the feedback of common node connection the 4th
Line, the 4th feeder terminal form public port, and the public port is the 4th port of balanced duplexer.
First wave filter includes the first resonator and the second resonator, and the second wave filter includes the 3rd resonator and the
Four resonators, the 3rd wave filter include the 5th resonator and sixth resonator, and the 4th wave filter includes the 7th resonator and the 8th
Resonator.
First resonator and the second resonator, the 3rd resonator and the 4th resonator along the symmetrical axial symmetry of same,
The symmetry axis is referred to as YY ' axles, and the first resonator and the 3rd resonator, the second resonator and the 4th resonator are by the low of open-end
Impedance transmission lines connect with the high-impedance transmission line of terminal short circuit, close on corresponding to resonator for Low ESR region, close on OO '
Axle for high impedance areas.
The 5th resonator and sixth resonator, the 7th resonator and the 8th resonator along the symmetrical axial symmetry of same,
The symmetry axis is referred to as ZZ ' axles, and the 5th resonator and the 7th resonator, sixth resonator and the 8th resonator are by the low of open-end
Impedance transmission lines connect with the high-impedance transmission line of terminal short circuit, close on corresponding to resonator for Low ESR region, close on OO '
Axle for high impedance areas.
First resonator, the second resonator, the 5th resonator and sixth resonator successively with the 3rd resonator, the 4th
Resonator, the 7th resonator and the 8th resonator connect along OO ' axial symmetry.
The periphery of first resonator is provided with the first open circuit minor matters, and the periphery of the 5th resonator is provided with the 3rd
Open circuit minor matters, the first open circuit minor matters connect common node with the 3rd open circuit minor matters.
The periphery of 3rd resonator is provided with the 6th open circuit minor matters, and the periphery of the 7th resonator is provided with the 7th
Open circuit minor matters, the 6th open circuit minor matters connect another common node with the 7th open circuit minor matters.
The periphery of second resonator is provided with the second open circuit minor matters, and the second open circuit minor matters connect the second feeder line,
The end of second feeder line is second port.
The periphery of 4th resonator is provided with the 5th open circuit minor matters, and the 5th open circuit minor matters connect the 5th feeder line,
The end of 5th feeder line is fifth port.
The periphery of the sixth resonator is provided with the 4th open circuit minor matters, and the 4th open circuit minor matters connect the 3rd feeder line,
The end of 3rd feeder line is the 3rd port.
The periphery of 8th resonator is provided with the 8th open circuit minor matters, and the 8th open circuit minor matters connect the 6th feeder line,
The end of 6th feeder line is the 6th port.
As shown in figure 3, equivalent circuit structure of first wave filter under common-mode signal excitation, now the first wave filter and the
Two wave filters are open circuit in connection, are thus equivalent to a both ends open circuit SIR wave filter, are said by taking the first wave filter as an example
It is bright without loss of generality.Now the resonant frequency of the first wave filter is away from desired difference mode signal passband, in the band of difference mode signal
Common-mode signal can hardly be propagated, and thus reach the effect of high common mode inhibition.
As shown in figure 4, equivalent circuit structure of first balance filter under difference mode signal excitation, now the first wave filter
With the second wave filter connection for short circuit, be thus equivalent to a short at one end SIR wave filter, using the first wave filter as
Example explanation is without loss of generality.Now connected by adjusting the Low ESR region of SIR structures with the spacing of high impedance areas with feeder line
Position in open circuit minor matters, electricity, magnetic coupling coefficient ratio and the open circuit minor matters between resonator can be adjusted respectively positioned at feedback
The electrical length ratio on line both sides, and then produce transmission zero and its position and number can be controlled simultaneously.Now the first wave filter
（Second wave filter）1 and 3 transmission zeros are respectively provided with the upper stopband of the passband of its formation and lower stopband.First resonance
Device B1 and the second resonator B2 size determine the resonant frequency of the first wave filter, short by high impedance between two resonators
Road transmission line realizes magnetic coupling, and Low ESR open circuited transmission line is realized and is electrically coupled so that wave filter integrally has electricity, magnetic mixing coupling
Close, by the spacing and synchronous adjustment the second feeder line A3 connections that adjust the first Low ESR region F1 and the first high impedance areas F2
Position and common node D1 on the second open circuit minor matters C2 are connected to the position on the first open circuit minor matters C1, can adjust respectively
Electric coupling coefficient and magnetic coupling coefficient ratio and open circuit minor matters between resonator are located at the electrical length ratio on the second feeder line both sides, enter
And the lower stopband in the first wave filter produces a transmission zero, upper stopband produces two transmission zeros, and can control it
Position.Because first, second resonator is SIR structures, the first wave filter can produce wider upper stopband.
Equivalent circuit structure of second balance filter under difference mode signal excitation is identical with Fig. 4, but size is different, i.e. work
Working frequency is different.Now the 3rd wave filter and the 4th wave filter are short circuit in connection, and it is short to be thus equivalent to an one end
Road SIR wave filters, illustrate without loss of generality by taking the 3rd wave filter as an example.Upper stopband of 3rd wave filter in its passband formed
3 and 1 transmission zero are respectively provided with lower stopband.3rd resonator B3 and the 4th resonator B4 size determines the second filter
The resonant frequency of ripple device, two resonators, without loss of generality between magnetic coupling, Low ESR realized by high impedance short-circuited transmission line
Open circuited transmission line is realized and is electrically coupled so that wave filter integrally has electricity, magnetic hybrid coupled, by adjusting the second Low ESR region F3
With the second high impedance areas F4 spacing and the feeder line A3 of synchronous adjustment the 3rd be connected to position on the 4th open circuit minor matters C4 and
Common node D1 is connected to the position on the first open circuit minor matters C1, can adjust the electric coupling coefficient and magnetic between resonator respectively
Coupling ratio and open circuit minor matters are located at the electrical length ratio on the 3rd feeder line both sides, and then produce two in the lower stopband of the first wave filter
Transmission zero, upper stopband produces a transmission zero, and can control its position.For the first wave filter, the second filter
Equivalent to one open circuit minor matters of ripple device, because the mutual load effect between two wave filters causes the work in the second wave filter
A new transmission zero is generated in frequency band；Equally, for the second wave filter, equivalent to one open circuit of the first wave filter
Minor matters, because the mutual load effect between two wave filters to generate one in the working band of the first wave filter newly
Transmission zero, strengthen the isolation of duplexer.
As shown in figure 5, scattering parameter emulation and the measured result of present invention balance micro-strip duplexer.Wherein Sdd11It is poor to represent
Return loss under the excitation of mould signal, Sdd21、Sdd31Transmission coefficient under being encouraged for difference mode signal, Sdd23Encouraged for difference mode signal
Under isolation, Scc21、Scc31Transmission coefficient under being encouraged for common-mode signal, Scc23Isolation under being encouraged for difference mode signal.Institute
The the first passband mid-band frequency for stating balance micro-strip duplexer is 2.4GHz, and its 3dB relative bandwidth is 2.5%；In second passband
Frequency of heart is 2.6GHz, and its 3dB relative bandwidth is that 2%, as we can see from the figure emulation and measured result coincide well.In differential mode
Two signalling channel isolations have very high isolation effect below -45dB in signal passband.The common mode in difference mode signal passband
Signal suppresses below -40dB, has very high common mode inhibition effect.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned technological means, in addition to
Formed technical scheme is combined by above technical characteristic.
It is complete by above-mentioned description, relevant staff using the above-mentioned desirable embodiment according to the present invention as enlightenment
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property scope is not limited to the content on specification, it is necessary to determines its technical scope according to right.
Claims (9)
1. the wide upper high common mode inhibition micro-strip balanced duplexer of stopband of high selectivity, the micro-strip balanced duplexer are arranged in medium substrate
On, the medium substrate includes dielectric substrate, is coated on the upper metal level of dielectric substrate upper surface and is coated under dielectric substrate
The lower metal layer on surface, the micro-strip balanced duplexer are arranged in metal level, and the lower metal layer is used to be grounded, and its feature exists
In including the first balance filter and the second balance filter；
First balance filter includes the first wave filter and the second wave filter,
Second balance filter includes the 3rd wave filter and the 4th wave filter,
First wave filter, the second wave filter, the 3rd wave filter and the 4th wave filter include the two parts symmetrically connected, and
Public same symmetry axis, the symmetry axis are referred to as OO ' axles；
Two common nodes, two common node edges are provided between first balance filter and the second balance filter
OO ' axial symmetry, first balance filter are connected with the second balance filter by two common nodes；
Straight line where the center of two common nodes is referred to as XX ' axles, and first balance filter and the second balance filter close
In XX ' axial symmetry.
2. micro-strip balanced duplexer according to claim 1, it is characterised in that first balance filter uses stepping
Electric impedance resonator SIR, the first passband is formed, the centre frequency of the first passband is 2.4GHz；Second balance filter uses stepping
Electric impedance resonator SIR, the second passband is formed, the centre frequency of the second passband is 2.6GHz.
3. micro-strip balanced duplexer according to claim 2, it is characterised in that first wave filter and the 3rd wave filter
It is connected by a common node, the common node connects the first feeder line, and the first feeder terminal forms public port, the common port
Mouth is the first port of balanced duplexer；
Second wave filter and the 4th wave filter are connected by another common node, and the common node connects the 4th feeder line,
4th feeder terminal forms public port, and the public port is the 4th port of balanced duplexer.
4. micro-strip balanced duplexer according to claim 3, it is characterised in that first wave filter includes the first resonance
Device and the second resonator, the second wave filter include the 3rd resonator and the 4th resonator, and the 3rd wave filter includes the 5th resonator
And sixth resonator, the 4th wave filter include the 7th resonator and the 8th resonator,
Along the symmetrical axial symmetry of same, this is right for first resonator and the second resonator, the 3rd resonator and the 4th resonator
Claim axle to be referred to as YY ' axles, the first resonator and the 3rd resonator, the second resonator and the 4th resonator by open-end Low ESR
Transmission line connects with the high-impedance transmission line of terminal short circuit, close on corresponding to resonator for Low ESR region, close on OO ' axles
For high impedance areas；
Along the symmetrical axial symmetry of same, this is right for the 5th resonator and sixth resonator, the 7th resonator and the 8th resonator
Axle is claimed to be referred to as the Low ESR of ZZ ' axles, the 5th resonator and the 7th resonator, sixth resonator and the 8th resonator by open-end
Transmission line connects with the high-impedance transmission line of terminal short circuit, close on corresponding to resonator for Low ESR region, close on OO ' axles
For high impedance areas；
First resonator, the second resonator, the 5th resonator and sixth resonator successively with the 3rd resonator, the 4th resonance
Device, the 7th resonator and the 8th resonator connect along OO ' axial symmetry.
5. micro-strip balanced duplexer according to claim 4, it is characterised in that the periphery of first resonator is provided with
First open circuit minor matters, the periphery of the 5th resonator are provided with the 3rd open circuit minor matters, and the first open circuit minor matters and the 3rd are opened
Road minor matters connection common node,
The periphery of 3rd resonator is provided with the 6th open circuit minor matters, and the periphery of the 7th resonator is provided with the 7th open circuit
Minor matters, the 6th open circuit minor matters connect another common node with the 7th open circuit minor matters.
6. micro-strip balanced duplexer according to claim 5, it is characterised in that the periphery of second resonator is provided with
Second open circuit minor matters, the second open circuit minor matters connect the second feeder line, and the end of second feeder line is second port,
The periphery of 4th resonator is provided with the 5th open circuit minor matters, and the 5th open circuit minor matters connect the 5th feeder line, described
The end of 5th feeder line is fifth port,
The periphery of the sixth resonator is provided with the 4th open circuit minor matters, and the 4th open circuit minor matters connect the 3rd feeder line, described
The end of 3rd feeder line is the 3rd port,
The periphery of 8th resonator is provided with the 8th open circuit minor matters, and the 8th open circuit minor matters connect the 6th feeder line, described
The end of 6th feeder line is the 6th port.
7. micro-strip balanced duplexer according to claim 6, it is characterised in that first wave filter swashs in common-mode signal
Encourage down, the first wave filter and the second wave filter are open circuit in connection, are thus equivalent to a both ends open circuit SIR filtering
Device, now the resonant frequency of the first wave filter is several in the interior common-mode signal of the band of difference mode signal away from desired difference mode signal passband
It can not propagate, thus reach the effect of high common mode inhibition.
8. micro-strip balanced duplexer according to claim 7, it is characterised in that first balance filter is believed in differential mode
Number lower first wave filter of excitation and the second wave filter are short circuit in connection, are thus equivalent to a short at one end SIR filter
Ripple device, now it is connected to open circuit minor matters by adjusting the Low ESR region of SIR wave filters and the spacing and feeder line of high impedance areas
On position, adjust the electricity between resonator, magnetic coupling coefficient ratio and open circuit minor matters respectively and be located at the electrical length on feeder line both sides
Than, and then produce transmission zero and its position and number can be controlled simultaneously, now the first wave filter and the second wave filter exist
The upper stopband of its passband formed and lower stopband are respectively provided with 1 and 3 transmission zeros, the first resonator and the second resonator
Size determine the resonant frequency of the first wave filter, magnetic coupling is realized by high impedance short-circuited transmission line between two resonators
Close, Low ESR open circuited transmission line is realized and is electrically coupled so that wave filter integrally has electricity, magnetic hybrid coupled, low by regulation first
The feeder line of spacing and synchronous adjustment second of resistance region and the first high impedance areas is connected to the position in the second open circuit minor matters
The position in the first open circuit minor matters is connected to common node, adjusts electric coupling coefficient and magnetic coupling system between resonator respectively
Number ratio and open circuit minor matters are located at the electrical length ratio on the second feeder line both sides, and then produce a biography in the lower stopband of the first wave filter
Defeated zero point, upper stopband produces two transmission zeros, and controls its position.
9. micro-strip balanced duplexer according to claim 8, it is characterised in that second balance filter is believed in differential mode
Number lower equivalent circuit structure of excitation is identical with the first balance filter, but size difference, i.e. working frequency difference, and now the 3rd
Wave filter and the 4th wave filter are short circuit in connection, are thus equivalent to a short at one end SIR wave filter, the 3rd filtering
Device is respectively provided with 3 and 1 transmission zero in the upper stopband of its passband formed and lower stopband, the 3rd resonator and the 4th humorous
The size of device of shaking determines the resonant frequency of the second wave filter, two resonators, magnetic coupling is realized by high impedance short-circuited transmission line
Close, Low ESR open circuited transmission line is realized and is electrically coupled so that wave filter integrally has electricity, magnetic hybrid coupled, low by regulation second
The feeder line of spacing and synchronous adjustment the 3rd of resistance region and the second high impedance areas is connected to the position in the 4th open circuit minor matters
The position in the first open circuit minor matters is connected to common node, adjusts electric coupling coefficient and magnetic coupling ratio between resonator respectively
And open circuit minor matters are located at the electrical length ratio on the 3rd feeder line both sides, and then two transmission zero are produced in the lower stopband of the first wave filter
Point, upper stopband produces a transmission zero, and can control its position；For the first wave filter, the second wave filter phase
When minor matters of being opened a way in one, because the mutual load effect between the first wave filter and the second wave filter causes in the second wave filter
Working band in generate a new transmission zero；Equally, for the second wave filter, the first wave filter is equivalent to one
Individual open circuit minor matters, because the mutual load effect between two wave filters to generate in the working band of the first wave filter
One new transmission zero, strengthen the isolation of duplexer.
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| CN201710475409.2A CN107453014A (en) | 2017-06-21 | 2017-06-21 | The wide upper high common mode inhibition micro-strip balanced duplexer of stopband of high selectivity |
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| CN201710475409.2A CN107453014A (en) | 2017-06-21 | 2017-06-21 | The wide upper high common mode inhibition micro-strip balanced duplexer of stopband of high selectivity |
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| CN110518324A (en) * | 2019-07-16 | 2019-11-29 | 杭州电子科技大学 | It is a kind of with it is outer introduce dual transfer zero broadband filter |
| CN113782936A (en) * | 2021-09-09 | 2021-12-10 | 上海电气(集团)总公司智惠医疗装备分公司 | Unbalanced-to-balanced converter of radio frequency coaxial cable based on double shielding layers |
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