CN107171044A - A kind of hybrid coupled micro-strip duplexer - Google Patents
A kind of hybrid coupled micro-strip duplexer Download PDFInfo
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- CN107171044A CN107171044A CN201710304618.0A CN201710304618A CN107171044A CN 107171044 A CN107171044 A CN 107171044A CN 201710304618 A CN201710304618 A CN 201710304618A CN 107171044 A CN107171044 A CN 107171044A
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- resonator
- minor matters
- open circuit
- feeder line
- passband
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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
- H01P1/20363—Linear resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/19—Conjugate devices, i.e. devices having at least one port decoupled from one other port of the junction type
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a kind of hybrid coupled micro-strip duplexer, first wave filter of design has one and two transmission zeros respectively in the upper stopband and lower stopband of its passband, second wave filter has two and a transmission zero respectively in the upper stopband and lower stopband of its passband, simultaneously, due to the mutual load effect between the first and second wave filters, so that respectively producing a new transmission zero in the interior lower section of band of the second and first passband, transmission zero is located proximate to passband edge, with very high frequency selectivity, and two dead-center positions therein are close and are located at the working frequency of another passband, so that there is very high isolation second port and the 3rd port, also achieve Wide stop bands simultaneously.The duplexer of the present invention, with compact structure, and the bandwidth and centre frequency of two passbands can carry out independent regulation by different dimensional parameters, it is the active demand in market to the new duplexer of duplexer high selectivity, high isolation, miniaturization, low cost to meet market.
Description
Technical field
The invention belongs to mobile communication signal transfer technical field, specifically a kind of hybrid coupled micro-strip duplexer.
Background technology
Duplexer is the essential device of communication system equipment.It is further tight with wireless communication system frequency resource
Lack, the also more and more higher of the requirement to the performance indications of duplexer.The volume and cost of duplexer are reduced for whole communication system
The reduction of cost has very important meaning.High selectivity, high isolation, miniaturization, the new duplexer of low cost are market
Active demand, is also the inexorable trend of duplexer development.
Utilize SIR（Stepped Impendence Resonator, be realized using the transmission line of different qualities impedance it is humorous
A kind of knot shaken）Structure can realize being substantially reduced for resonator surface product, while lifting the harmonic frequency of resonator, Ke Yishi
Stopband on the width of existing duplexer.For the wave filter being made up of SIR, by adjusting Low ESR region and high impedance areas
Spacing and feeder line are connected to the position in open circuit minor matters, can adjust respectively electricity between resonator, magnetic coupling coefficient ratio and
Minor matters of opening a way are located at the electrical length ratio on the second feeder line both sides, and then produce transmission zero and control its position and number.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of hybrid coupled micro-strip duplexer, the duplexer is effectively improved
The selectivity of wave filter, and a kind of duplexer of compact conformation is realized using the wave filter of design, and with Wide stop bands, height
Selectivity, the characteristic of high isolation, meet the actual demand of communication system.
For achieving the above object, the present invention realizes the theory of many transmission zeros based on hybrid coupled, and devising has
The high performance filter of multiple transmission zeros close to passband, concrete technical scheme is as follows：
A kind of hybrid coupled micro-strip duplexer, is formed on medium substrate, including the first feeder line, the second feeder line, the 3rd feeder line,
One open circuit minor matters, the second open circuit minor matters, the 3rd open circuit minor matters, the 4th open circuit minor matters, the first resonator, the second resonator, the 3rd
Resonator, the 4th resonator, common node, the first high impedance areas, the second high impedance areas, the first Low ESR region, second
Low ESR region；Wherein, first feeder line, common node, the first open circuit minor matters, the second feeder line, the second open circuit minor matters and the
First, the second resonator constitutes the first wave filter, produces the first passband；First feeder line, common node, the 3rd open circuit branch
Section, the 3rd feeder line and the 4th open circuit minor matters and the three, the 4th resonators constitute the second wave filter, produce the second passband.
Further, first, second, third, fourth resonator is SIR structures, is not waited by two sections of sizes
Microstrip line is formed by connecting along imaginary axis XX ', and the size of the first resonator and the second resonator determines the working frequency range of the first wave filter,
The size of 3rd resonator and the 4th resonator determines the working frequency range of the second wave filter.
Further, first wave filter and the second wave filter by common node be connected, first wave filter and
There is second wave filter a public feeder line to be the first feeder line and an input/output port；First feeder line and public section
Point is vertically connected；The first open circuit minor matters, the first resonator and the second open circuit minor matters, the second resonator are all flat with imaginary axis XX '
OK, and on imaginary axis YY ' symmetrically, the straight minor matters of first open circuit, the second open circuit minor matters with the high and low impedance of corresponding resonator
Transmission line interface aligns；It is described 3rd open circuit minor matters, the 3rd resonator and the 4th open circuit minor matters, the 4th resonator also all with void
Axle XX ' is parallel, and on imaginary axis ZZ ' symmetrically, the straight minor matters of same 3rd open circuit, the 4th open circuit minor matters with corresponding resonance
The high and low impedance transmission lines interface alignment of device.
Another to improve, first resonator, the second resonator, the 3rd resonator, the 4th resonator are pointing to X ' along X
The one end at place is grounded by the via that metallizes respectively.
Another to improve, the characteristic impedance of first, second, third feeder line is 50 ohm；Connect the first feeder line port
For first port.The second feeder line port is connected for second port, the 3rd feeder line port of connection is the 3rd port.
In above-mentioned technical proposal, first wave filter is operated in the first passband, and the second wave filter is operated in second and led to
Frequency band, wherein the first passband is operated in the wlan system using centre frequency as 2.4GHz, the second passband is operated in center
Frequency is 2.6GHz wlan system.
A kind of hybrid coupled micro-strip duplexer of the present invention, the upper stopband and lower resistance of the first wave filter of design in its passband
Band has one and two transmission zeros respectively, and the second wave filter has two and one respectively in the upper stopband and lower stopband of its passband
Transmission zero, simultaneously as the mutual load effect between the first and second wave filters so that in the second and first passband
New transmission zero is respectively produced with interior lower section, transmission zero is located proximate to passband edge, with very high frequency selection
Property, and two dead-center positions therein are close and are located at the working frequency of another passband so that second port and the 3rd end
Mouth has very high isolation, while also achieving Wide stop bands.The duplexer of the present invention, with compact structure, and two passbands
Bandwidth and centre frequency independent regulation can be carried out by different dimensional parameters, meet market to duplexer high selection
Property, high isolation, miniaturization, low cost new duplexer be market active demand.
Brief description of the drawings
The hybrid coupled micro-strip duplexer that Fig. 1 is the present invention uses printed circuit board (PCB)（PCB）Schematic diagram；
Fig. 2 is structural representation in hybrid coupled micro-strip duplexer one embodiment of the invention；
Fig. 3 is transmission zero and electricity, the magnetic coupling system of hybrid coupled micro-strip duplexer one embodiment median filter of the present invention
Number when than the 3D of relation scheme by open circuit minor matters electrical length；
Fig. 4 is the simulation result in hybrid coupled micro-strip duplexer one embodiment of the present invention using HFSS softwares；
Fig. 5 for the present invention hybrid coupled micro-strip duplexer one embodiment in use Agilent N5230C vector network analyzers
Test result.
Reference title is as follows：
A1：First feeder line；A2：Second feeder line；A3：3rd feeder line；
B1：First resonator；B2：Second resonator；B3：3rd resonator；B4：4th 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；
D1：Common node；
E1：First metallization via；E2：Second metallization via；E3：3rd metallization via；E4：4th metallization via；
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.
Embodiment
Below in conjunction with the accompanying drawings, a kind of hybrid coupled micro-strip duplexer proposed by the present invention is described in detail.In this hair
In bright description, it is to be understood that the orientation of instruction such as term " left side ", " right side ", " top ", " bottom ", " bottom " or
Position relationship is, based on orientation shown in the drawings or position relationship, to be for only for ease of the description present invention and simplify description, without
It is that instruction or the signified device of hint or element must have specific orientation, with specific azimuth configuration and operation, " first ",
" second " etc. is not offered as the significance level of parts, therefore is not considered as limiting the invention.Used in the present embodiment
Specific size technical scheme solely for the purpose of illustration, be not intended to limit protection scope of the present invention.
3 ports of hybrid coupled micro-strip duplexer described in the present embodiment using SMA welding, so as to access test or
Person is connected with circuit.
The duplexer of the present embodiment uses relative dielectric constant for 2.2, and thickness is used as medium base for 0.508mm pcb board
Plate, it would however also be possible to employ the pcb board of other specifications is used as substrate.As shown in figure 1, the upper and lower surface of the dielectric substrate S1 in pcb board
It has been respectively coated by metal level S2 and lower metal layer S3.
Fig. 2 is the schematic top plan view of the duplexer.In figure duplexer be passed through by two second order microwave filters it is public
Node D1 is connected, and is connected parallel to imaginary axis XX ' the first feeder line A1 with common node.First port port1 is first, second
The public port of wave filter；Another port of first wave filter is second port port2；Another of second wave filter
Port is the 3rd port port3.
Constitute the first resonator B1, the second resonator B2 width microstrip line not etc., wider microstrip line along perpendicular to
Width on imaginary axis XX ' directions is 1.1mm, along the length on imaginary axis XX ' directions be between 10.57mm, two microstrip lines it is first low
Resistance region F1 is 0.5mm along the spacing on imaginary axis XX ' directions；Narrower microstrip line is along perpendicular to imaginary axis XX ' directions
On width be 0.175mm, be the first high impedance areas F2 between 5.73mm, two microstrip lines along the length on imaginary axis XX ' directions
It is 0.95mm along the spacing on imaginary axis XX ' directions.
First open circuit minor matters C1 is connected with common node D1, and it is 0.3mm along the width on imaginary axis XX ' directions,
It is 8.97mm along the length on imaginary axis XX ' directions.Second open circuit minor matters C2 is connected with the second feeder line A2, and it is along perpendicular to the imaginary axis
Width on XX ' directions is 0.3mm, is 8.5mm along the length on imaginary axis XX ' directions.
Constitute the 3rd resonator B3, the 4th resonator B4 width microstrip line not etc., wider microstrip line along perpendicular to
Width on imaginary axis XX ' directions is 1.15mm, is the second low-resistance between 9.5mm, two microstrip lines along the length on imaginary axis XX ' directions
Anti- region F3 is 0.45mm along the spacing on imaginary axis XX ' directions；Narrower microstrip line is along on imaginary axis XX ' directions
Width be 0.19mm, along the length on imaginary axis XX ' directions be between 5.6mm, two microstrip lines the second high impedance areas F4 along hang down
It is straight in the spacing on imaginary axis XX ' directions be 1.27mm.
3rd open circuit minor matters C3 is connected with common node D1, and it is 0.3mm along the width on imaginary axis XX ' directions,
It is 7.9mm along the length on imaginary axis XX ' directions.4th open circuit minor matters C4 is connected with the 3rd feeder line A3, and it is along perpendicular to imaginary axis XX '
Width on direction is 0.3mm, is 7.4mm along the length on imaginary axis XX ' directions.
First feeder line A1 is 1.565mm along the width on imaginary axis XX ' directions, the length along on imaginary axis XX ' directions
It is 9 mm.Second feeder line A2 is to be connected to form with isosceles trapezoid by rectangular shaped microstrip, the bottom of isosceles trapezoid micro-strip and rectangle
Micro-strip is connected, and rectangular shaped microstrip is 4.14mm along the length on imaginary axis XX ' directions, the width along on imaginary axis XX ' directions
It is 1.565mm；The height of isosceles trapezoid micro-strip is 1.6mm, and upper bottom width is 0.465mm, and bottom width is 1.565mm.3rd
Feeder line A3 is equally to be connected to form with isosceles trapezoid by rectangular shaped microstrip, the bottom of isosceles trapezoid micro-strip and rectangular shaped microstrip phase
Even, rectangular shaped microstrip is 4.14mm along the length on imaginary axis XX ' directions, is along the width on imaginary axis XX ' directions
1.565mm；The height of isosceles trapezoid micro-strip is 1.6mm, and upper bottom width is 0.465mm, and bottom width is 1.565mm.Public section
Point is connected by rectangular shaped microstrip and two pieces of isosceles trapezoid micro-strips, length of the rectangular shaped microstrip edge on imaginary axis XX ' directions
It is 2.9mm, in being 1.565mm, the size of two pieces of isosceles trapezoid micro-strips and the first feeder line A1 along the width on imaginary axis XX ' directions
Isosceles trapezoid size is identical.First metallization via E1, the second metallization via E2, the 3rd metallization via E3, the 4th metal
The radius for changing via E4 is all 0.3mm.
First resonator B1 and the second resonator B2 size determine the resonant frequency of the first wave filter, two resonators
Between magnetic coupling is 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 same step that adjust the first Low ESR region F1 and the first high impedance areas F2
The position and common node D1 that whole second feeder line A3 is connected on the second open circuit minor matters C2 are connected on the first open circuit minor matters C1
Position, electric coupling coefficient and magnetic coupling coefficient ratio between resonator can be adjusted respectively and open circuit minor matters are located at the second feeder line
The electrical length ratio on both sides, and then a transmission zero is produced in the lower stopband of the first wave filter, upper stopband produces two transmission zero
Point, and its position can be controlled.
The transmission zero of wave filter and electricity, magnetic coupling coefficient when open a way minor matters electrical length than relation as shown in figure 3, wherein
X, y-axis are respectively electric coupling coefficient and magnetic coupling coefficient ratio and open circuit minor matters electrical length ratio, and z-axis is admittance Y21 value.Due to
First, the second resonator is SIR structures, and the first wave filter can produce wider upper stopband.3rd resonator B3 and the 4th resonance
Device B4 size is determined realizes magnetic between the resonant frequency of the second wave filter, two resonators by high impedance short-circuited transmission line
Coupling, Low ESR open circuited transmission line is realized and is electrically coupled so that wave filter integrally has electricity, magnetic hybrid coupled, passes through regulation second
Low ESR region F3 and the second high impedance areas F4 spacing and the feeder line A3 of synchronous adjustment the 3rd is connected to the 4th open circuit minor matters
Position and common node D1 on C4 are connected to the position on the first open circuit minor matters C1, and the electricity between resonator can be adjusted respectively
The coefficient of coup and magnetic coupling ratio and open circuit minor matters are located at the electrical length ratio on the 3rd feeder line both sides, and then under the first wave filter
Stopband produces two transmission zeros, and upper stopband produces a transmission zero, and can control its position.For the first wave filter
For, equivalent to one open circuit minor matters of the second wave filter, because the mutual load effect between two wave filters causes second
A new transmission zero is generated in the working band of wave filter；Equally, for the second wave filter, the first wave filter phase
When minor matters of being opened a way in one, because the mutual load effect between two wave filters causes in the working band of the first wave filter
A new transmission zero is generated, strengthens the isolation of duplexer.
Fig. 4 gives the simulation result of hybrid coupled micro-strip duplexer, in as a result showing that the passband of duplexer first is operated in
Frequency of heart is 2.4GHz, and relative bandwidth is 2% wlan system, and the second passband is operated in centre frequency for 2.6GHz, relative bandwidth
For 2% wlan system, when duplexer is operated in the first passband, there is a transmission zero in its lower stopband, upper stopband there are 2
Transmission zero, 3 transmission zeros are located at 1.12,2.59 and 2.69GHz respectively.When duplexer is operated in the second passband, at it
Lower stopband has 3 transmission zeros, and 3 transmission zeros are located at 1.44,2.4 and 2.5GHz respectively.
Fig. 5 gives the test result of hybrid coupled micro-strip duplexer, and test result matches with simulation result.
Based on description of the preferred embodiment of the present invention, it should be apparent that the sheet being defined by the appended claims
Invention is not limited only to the specific detail that is illustrated in specification above, without departing from present inventive concept or scope to this hair
Bright many obviously change equally possible reaches the purpose of the present invention.
Claims (6)
1. a kind of hybrid coupled micro-strip duplexer, it is characterised in that be formed on medium substrate, including the first feeder line, the second feedback
Line, the 3rd feeder line, the first open circuit minor matters, the second open circuit minor matters, the 3rd open circuit minor matters, the 4th open circuit minor matters, the first resonator, the
It is two resonators, the 3rd resonator, the 4th resonator, common node, the first high impedance areas, the second high impedance areas, first low
Resistance region, the second Low ESR region；Wherein, first feeder line, common node, the first open circuit minor matters, the second feeder line, second
Minor matters of opening a way and first, second resonator constitute the first wave filter, produce the first passband；First feeder line, common node,
3rd open circuit minor matters, the 3rd feeder line and the 4th open circuit minor matters and the three, the 4th resonators constitute the second wave filter, produce second and lead to
Frequency band.
2. hybrid coupled micro-strip duplexer according to claim 1, it is characterised in that described first, second, third,
Four resonators are SIR structures, are that the microstrip line not waited by two sections of sizes is formed by connecting along imaginary axis XX ', the first resonator and the
The size of two resonators determines the working frequency range of the first wave filter, and the size of the 3rd resonator and the 4th resonator determines the second filter
The working frequency range of ripple device.
3. hybrid coupled micro-strip duplexer according to claim 2, it is characterised in that first wave filter and the second filter
Ripple device by common node be connected, first wave filter and the second wave filter have a public feeder line be the first feeder line and
One input/output port；First feeder line is vertically connected with common node；It is described first open circuit minor matters, the first resonator and
Second open circuit minor matters, the second resonator are all parallel with imaginary axis XX ', and, the straight minor matters of first open circuit, on imaginary axis YY ' symmetrically
Second open circuit minor matters are alignd with the high and low impedance transmission lines interface of corresponding resonator；It is the 3rd open circuit minor matters, the 3rd humorous
Shake device and the 4th open circuit minor matters, the 4th resonator it is also all parallel with imaginary axis XX ', and on imaginary axis ZZ ' symmetrically, the same described 3rd
Straight minor matters, the 4th open circuit minor matters of opening a way are alignd with the high and low impedance transmission lines interface of corresponding resonator.
4. hybrid coupled micro-strip duplexer according to claim 2, it is characterised in that first resonator, second humorous
Shake device, the 3rd resonator, the 4th resonator is grounded by the via that metallizes respectively in one end that X ' places are pointed to along X.
5. hybrid coupled micro-strip duplexer according to claim 1, it is characterised in that first, second, third feeder line
Characteristic impedance be 50 ohm；The first feeder line port is connected for first port；The second feeder line port is connected for second port, connection
3rd feeder line port is the 3rd port.
6. the hybrid coupled micro-strip duplexer according to any one of claim 1 to 5, it is characterised in that first filtering
Device is operated in the first passband, and the second wave filter is operated in the second passband, wherein the first passband is operated in centre frequency
For 2.4GHz wlan system, the second passband is operated in the wlan system using centre frequency as 2.6GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710304618.0A CN107171044A (en) | 2017-05-03 | 2017-05-03 | A kind of hybrid coupled micro-strip duplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710304618.0A CN107171044A (en) | 2017-05-03 | 2017-05-03 | A kind of hybrid coupled micro-strip duplexer |
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| Publication Number | Publication Date |
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| CN107171044A true CN107171044A (en) | 2017-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710304618.0A Pending CN107171044A (en) | 2017-05-03 | 2017-05-03 | A kind of hybrid coupled micro-strip duplexer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910435A (en) * | 2021-01-25 | 2021-06-04 | 武汉光谷航天三江激光产业技术研究院有限公司 | Duplexer device and network implementation method thereof |
| CN115513627A (en) * | 2022-08-24 | 2022-12-23 | 声呐天空资讯顾问有限公司 | Frequency divider and antenna array |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633400A (en) * | 2013-11-19 | 2014-03-12 | 华南理工大学 | Electromagnetic hybrid coupling-based micro-strip duplexer |
| CN103972617A (en) * | 2014-05-16 | 2014-08-06 | 西安电子科技大学 | Broadband duplexer based on stub-loaded dual-mode resonator |
| CN105552492A (en) * | 2016-01-19 | 2016-05-04 | 南京航空航天大学 | Microstrip duplexer applied to WLAN system |
-
2017
- 2017-05-03 CN CN201710304618.0A patent/CN107171044A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633400A (en) * | 2013-11-19 | 2014-03-12 | 华南理工大学 | Electromagnetic hybrid coupling-based micro-strip duplexer |
| CN103972617A (en) * | 2014-05-16 | 2014-08-06 | 西安电子科技大学 | Broadband duplexer based on stub-loaded dual-mode resonator |
| CN105552492A (en) * | 2016-01-19 | 2016-05-04 | 南京航空航天大学 | Microstrip duplexer applied to WLAN system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910435A (en) * | 2021-01-25 | 2021-06-04 | 武汉光谷航天三江激光产业技术研究院有限公司 | Duplexer device and network implementation method thereof |
| CN115513627A (en) * | 2022-08-24 | 2022-12-23 | 声呐天空资讯顾问有限公司 | Frequency divider and antenna array |
| CN115513627B (en) * | 2022-08-24 | 2024-02-06 | Oppo广东移动通信有限公司 | Frequency divider and antenna array |
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