CN106099268A - A kind of broadband merit filter-divider - Google Patents

A kind of broadband merit filter-divider Download PDF

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CN106099268A
CN106099268A CN201610603180.1A CN201610603180A CN106099268A CN 106099268 A CN106099268 A CN 106099268A CN 201610603180 A CN201610603180 A CN 201610603180A CN 106099268 A CN106099268 A CN 106099268A
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resonator
wavelength
quarter
impedance resonator
dielectric substrate
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邓静
邓一静
刘倩文
王雪道
陆佳元
王建朋
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/2002Dielectric waveguide filters

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Abstract

本发明公开了一种宽带功分滤波器,包括下表面覆有金属接地板(102)的介质基板(101),在所述介质基板(101)的上表面设有输入端馈线(1)、第一输出端馈线(2)、第二输出端馈线(3)、第一三模谐振器(4)、第二三模谐振器(5)、第一接地阶梯阻抗谐振器(6)、第二接地阶梯阻抗谐振器(7)、第三接地阶梯阻抗谐振器(8)、隔离电阻(9)。本发明宽带功分滤波器选择性好、隔离度高、具有较好的谐波抑制特性,适用于现代无线通信系统。

The invention discloses a broadband power division filter, which comprises a dielectric substrate (101) whose lower surface is covered with a metal grounding plate (102), and an input terminal feeder (1), The first output feeder (2), the second output feeder (3), the first three-mode resonator (4), the second three-mode resonator (5), the first grounded ladder impedance resonator (6), the second A second grounded ladder impedance resonator (7), a third grounded ladder impedance resonator (8), and an isolation resistor (9). The broadband power dividing filter of the invention has good selectivity, high isolation and good harmonic suppression characteristics, and is suitable for modern wireless communication systems.

Description

一种宽带功分滤波器A Broadband Power Divider Filter

技术领域technical field

本发明涉及微波无源器件技术领域,特别是一种基于分立元件隔离网络及三模谐振器的宽带功分滤波器。The invention relates to the technical field of microwave passive devices, in particular to a broadband power division filter based on a discrete element isolation network and a three-mode resonator.

背景技术Background technique

功分滤波器是一个独立的微波无源器件,它在功能上实现了射频电路中功分器和滤波器的有效结合,也就是说功分滤波器兼备了信号的功率分配和滤波功能。因此,高性能的功分滤波器不仅能够有效减小系统的尺寸,而且能够简化系统设计的复杂度,从而进一步实现无线通信系统的低成本、高性能、小型化设计。The power divider filter is an independent microwave passive device, which functionally realizes the effective combination of the power divider and filter in the radio frequency circuit, that is to say, the power divider filter has both signal power distribution and filtering functions. Therefore, a high-performance power division filter can not only effectively reduce the size of the system, but also simplify the complexity of system design, thereby further realizing the low-cost, high-performance, and miniaturized design of the wireless communication system.

近年来,随着模块结构单元(Modular Building Block,MBB)和单片微波集成电路(Monolithic Microwave Integrated Circuit,MMIC)的发展,低成本、高集成度、小型化的高性能功分滤波器成为了研究热点。In recent years, with the development of Modular Building Block (MBB) and Monolithic Microwave Integrated Circuit (MMIC), low-cost, high-integration, and miniaturized high-performance power divider filters have become Research hotspots.

2005年,Chi-Feng Chen,Ting-Yi Huang和Ruey-Beei Wu在IEEETransaction.Microwave Theory Technique期刊(vol.53,no.12,pp.3788-3793,2005)上发表“Design of Microstrip Bandpass Filters With Multiorder Spurious-ModeSuppression”,提出在平行耦合的理论基础上结合电容终端加载枝节的谐振特性来实现高次谐波抑制的设计方法。这种设计方法虽然设计理论较为简单,但是由于该结构引入了阶梯阻抗谐振器,使得所设计的功分滤波器的带宽较窄。此外,由于该电路由单纯的平行耦合理论实现,因此该滤波器没有带外零点,信号选择性较差。In 2005, Chi-Feng Chen, Ting-Yi Huang and Ruey-Beei Wu published "Design of Microstrip Bandpass Filters With Multiorder Spurious-ModeSuppression", proposes a design method based on the theory of parallel coupling combined with the resonance characteristics of the capacitive terminal loading stub to achieve high-order harmonic suppression. Although the design theory of this design method is relatively simple, because the structure introduces a ladder impedance resonator, the bandwidth of the designed power dividing filter is relatively narrow. In addition, since the circuit is realized by pure parallel coupling theory, the filter has no out-of-band zero and the signal selectivity is poor.

2015年,Kaijun Song在IEEE Electronics Letters期刊(vol.51,no.6,pp.495–497,2015)上发表“Compact filtering power divider with high frequencyselectivity and wide stopband using embedded dual-mode resonator”,提出通过嵌入双模谐振器来实现功分和滤波功能,同时利用源载耦合引入带外零点提高带外抑制,信号选择性较好。但是,由于该结构单纯使用隔离电阻实现两个输出端口之间的隔离,通带内隔离度较差。In 2015, Kaijun Song published "Compact filtering power divider with high frequency selectivity and wide stopband using embedded dual-mode resonator" in IEEE Electronics Letters (vol.51, no.6, pp.495–497, 2015), proposing to adopt Embed a dual-mode resonator to achieve power division and filtering functions, and at the same time use source-carrier coupling to introduce an out-of-band zero point to improve out-of-band rejection, and the signal selectivity is better. However, because this structure simply uses isolation resistors to achieve isolation between the two output ports, the isolation in the passband is poor.

2015年,Bo Zhang和Yuanan Liu在IEEE Electronics Letters期刊(vol.51,no.23,pp.1950-1952,2015)上发表“Wideband Filtering Power Divider with HighSelectivity”,提出通过平行耦合线和终端开路枝节的相互搭配来设计功分滤波器的方法,实现了较宽的工作带宽,较好的信号选择性。虽然这种设计方法设计的功分滤波器在低频段具有体积小的优点,但是由于结构简单,存在带外抑制度不高的缺点。In 2015, Bo Zhang and Yuanan Liu published "Wideband Filtering Power Divider with High Selectivity" in the IEEE Electronics Letters journal (vol.51, no.23, pp.1950-1952, 2015), proposing to open the branch through parallel coupling lines and terminals The method of designing the power division filter with the combination of the two components achieves a wider working bandwidth and better signal selectivity. Although the power division filter designed by this design method has the advantage of small size in the low frequency band, it has the disadvantage of low out-of-band rejection due to its simple structure.

总之,现有技术存在的问题是:宽带功分滤波器选择性差、隔离度低、带外抑制差。In a word, the existing problems in the prior art are: the wideband power division filter has poor selectivity, low isolation, and poor out-of-band rejection.

发明内容Contents of the invention

本发明的目的在于提供一种宽带功分滤波器,选择性好、隔离度高、带外抑制好。The purpose of the present invention is to provide a broadband power division filter with good selectivity, high isolation and good out-of-band suppression.

实现本发明目的的技术解决方案为:The technical solution that realizes the object of the present invention is:

一种宽带功分滤波器,包括下表面覆有金属接地板的介质基板,A broadband power division filter, comprising a dielectric substrate covered with a metal ground plate on the lower surface,

在所述介质基板的上表面设有输入端馈线、第一输出端馈线、第二输出端馈线、第一三模谐振器、第二三模谐振器、第一接地阶梯阻抗谐振器、第二接地阶梯阻抗谐振器、第三接地阶梯阻抗谐振器、隔离电阻,所述第一三模谐振器、第二三模谐振器的输入端分别与输入端馈线耦合,其输出端分别与第一输出端馈线、第二输出端馈线耦合,所述第三接地阶梯阻抗谐振器与第一输出端馈线和第二输出端馈线的输入端相连,所述第一接地阶梯阻抗谐振器与第一输出端馈线的输出端相连,第二接地阶梯阻抗谐振器与第二输出端馈线的输出端相连,第一接地阶梯阻抗谐振器、第二接地阶梯阻抗谐振器、第三接地阶梯阻抗谐振器的另一端穿过介质基板与金属接地板相连。An input feeder, a first output feeder, a second output feeder, a first three-mode resonator, a second three-mode resonator, a first grounded ladder impedance resonator, a second A grounded ladder impedance resonator, a third grounded ladder impedance resonator, and an isolation resistor, the input terminals of the first three-mode resonator and the second three-mode resonator are respectively coupled to the input feeder, and the output terminals are respectively connected to the first output The end feeder and the second output end feeder are coupled, the third grounded ladder impedance resonator is connected to the input end of the first output end feeder and the second output end feeder, and the first grounded ladder impedance resonator is connected to the first output end The output end of the feeder is connected, the second grounded ladder impedance resonator is connected to the output end of the second output end feeder, the other end of the first grounded ladder impedance resonator, the second grounded ladder impedance resonator, and the third grounded ladder impedance resonator Connect to the metal ground plate through the dielectric substrate.

本发明与现有技术相比,其显著优点为:Compared with the prior art, the present invention has the remarkable advantages of:

1、选择性好:现有功分滤波器一般结构简单,不能产生带外零点,从而导致虽然能够实现滤波功能,但通带带外选择性差。本发明中的一端端接开路枝节的耦合线会在通带两侧分别产生一个零点,电路中所使用的三模谐振器偶模所产生的零点也会在通带一侧产生一个零点。综上所述的两个因素,实现了电路通带的高选择性。1. Good selectivity: the existing power division filters are generally simple in structure and cannot generate out-of-band zeros, resulting in poor passband out-of-band selectivity although the filtering function can be realized. In the present invention, the coupling line with one end connected to the open stub will generate a zero point on both sides of the pass band, and the zero point generated by the even mode of the three-mode resonator used in the circuit will also generate a zero point on the pass band side. The two factors mentioned above realize the high selectivity of the passband of the circuit.

2、隔离度高:现有功分滤波器的隔离网络一般仅使用隔离电阻,来实现通带内的隔离度,但是由于单纯引入隔离电阻并不能满足所有电路的隔离度设计指标,所以这些电路的隔离度有时并不能实现在整个通带内达到15dB。本发明电路采用分立阶梯阻抗谐振器隔离网络,该网络包括一个中端加载阶梯阻抗谐振器,两个旁端加载阶梯阻抗谐振器以及一个隔离电阻。通过采用该隔离网络,可以降低输出端口的奇偶模输入阻抗的差异,从而在整个通带内实现较好的隔离度。2. High isolation: The isolation network of the existing power dividing filter generally only uses isolation resistors to achieve isolation in the passband, but because the simple introduction of isolation resistors cannot meet the isolation design indicators of all circuits, the isolation of these circuits Isolation is sometimes not able to achieve 15dB over the entire passband. The circuit of the present invention adopts a discrete ladder impedance resonator isolation network, and the network includes a middle-end loading ladder impedance resonator, two side-end loading ladder impedance resonators and an isolation resistor. By adopting the isolation network, the difference of odd and even mode input impedance of the output port can be reduced, so as to achieve better isolation in the entire passband.

3、带外抑制好:现有的功分滤波器一般结构简单,不能在带外产生零点从而导致带外谐波不能被抑制。本发明之所以能够产生较宽的上变频阻带,是因为一端端接开路枝节的耦合线能够在上边带产生若干零点,同时中端加载阶梯阻抗谐振器以及旁端加载阶梯阻抗谐振器也能够在自身谐振点处对电路上边带产生若干零点。综合以上两种方式,本发明实现了较宽的带外抑制度。3. Good out-of-band suppression: The existing power divider filters are generally simple in structure, and cannot generate zero points outside the band, so that the out-of-band harmonics cannot be suppressed. The reason why the present invention can produce wider up-conversion stop band is that the coupled line with one end connected to the open-circuit stub can produce several zero points in the upper sideband, and the stepped impedance resonator loaded at the middle end and the stepped impedance resonator loaded at the side end can also Several nulls are created on the upper sideband of the circuit at the point of self-resonance. Combining the above two methods, the present invention realizes a wider out-of-band suppression degree.

附图说明Description of drawings

图1是本发明宽带功分滤波器的立体结构示意图。FIG. 1 is a schematic diagram of a three-dimensional structure of a broadband power division filter of the present invention.

图2是图1的俯视图。FIG. 2 is a top view of FIG. 1 .

图3是实施例的结构尺寸示意图。Fig. 3 is a schematic diagram of the structural dimensions of the embodiment.

图4是实施例的S11、S21和S31参数仿真图。Fig. 4 is a simulation diagram of parameters S11, S21 and S31 of the embodiment.

图5是实施例的S23参数仿真图。Fig. 5 is a simulation diagram of S23 parameters of the embodiment.

图6是实施例的两个输出端口幅度差的仿真图。Fig. 6 is a simulation diagram of amplitude difference of two output ports of the embodiment.

图7是实施例的两个输出端口相位差的仿真图。Fig. 7 is a simulation diagram of the phase difference of two output ports of the embodiment.

图中,介质基板101,金属接地板102,In the figure, a dielectric substrate 101, a metal ground plate 102,

输入端馈线1,第一输出端馈线2,第二输出端馈线3,第一三模谐振器4,第二三模谐振器5,第一接地阶梯阻抗谐振器6,第二接地阶梯阻抗谐振器7,第三接地阶梯阻抗谐振器8,隔离电阻9,Input feeder 1, first output feeder 2, second output feeder 3, first three-mode resonator 4, second three-mode resonator 5, first grounded ladder impedance resonator 6, second grounded ladder impedance resonance device 7, the third grounded ladder impedance resonator 8, isolation resistor 9,

第一50欧姆微带线导带11,第一半波长主传输线12,第二半波长主传输线13,The first 50 ohm microstrip conduction band 11, the first half-wavelength main transmission line 12, the second half-wavelength main transmission line 13,

第二50欧姆微带线导带21,第一微带传输线22,第一四分之一波长耦合线23,The second 50 ohm microstrip conduction band 21, the first microstrip transmission line 22, the first quarter-wave coupling line 23,

第三50欧姆微带线导带31,第二微带传输线32,第二四分之一波长耦合线33,The third 50-ohm microstrip conduction band 31, the second microstrip transmission line 32, the second quarter-wave coupling line 33,

第一四分之一波长谐振器41,第二四分之一波长谐振器42,第一对称面枝节加载低阻抗谐振器43,第一对称面枝节加载高阻抗谐振器44,A first quarter-wavelength resonator 41, a second quarter-wavelength resonator 42, a low-impedance resonator 43 loaded on a branch of the first symmetry plane, and a high-impedance resonator 44 loaded on a branch of the first symmetry plane,

第三四分之一波长谐振器51,第四四分之一波长谐振器52,第二对称面枝节加载低阻抗谐振器53,第二对称面枝节加载高阻抗谐振器54,A third quarter-wavelength resonator 51, a fourth quarter-wavelength resonator 52, a low-impedance resonator 53 loaded with a branch of the second symmetry plane, and a high-impedance resonator 54 loaded with a branch of the second symmetry plane,

第一高阻抗谐振器61,第一低阻抗谐振器62,The first high-impedance resonator 61, the first low-impedance resonator 62,

第二高阻抗谐振器71,第二低阻抗谐振器72,The second high impedance resonator 71, the second low impedance resonator 72,

第三高阻抗谐振器81,第三低阻抗谐振器82。A third high-impedance resonator 81 and a third low-impedance resonator 82 .

具体实施方式detailed description

如图1所示,本发明宽带功分滤波器,包括下表面覆有金属接地板102的介质基板101,As shown in Figure 1, the broadband power division filter of the present invention includes a dielectric substrate 101 covered with a metal ground plate 102 on the lower surface,

在所述介质基板101的上表面设有输入端馈线1、第一输出端馈线2、第二输出端馈线3、第一三模谐振器4、第二三模谐振器5、第一接地阶梯阻抗谐振器6、第二接地阶梯阻抗谐振器7、第三接地阶梯阻抗谐振器8、隔离电阻9,On the upper surface of the dielectric substrate 101, there are input feeder 1, first output feeder 2, second output feeder 3, first three-mode resonator 4, second three-mode resonator 5, first grounding ladder Impedance resonator 6, second grounded ladder impedance resonator 7, third grounded ladder impedance resonator 8, isolation resistor 9,

所述第一三模谐振器4、第二三模谐振器5的输入端分别与输入端馈线1耦合,其输出端分别与第一输出端馈线2、第二输出端馈线3耦合,所述第三接地阶梯阻抗谐振器8与第一输出端馈线2和第二输出端馈线3的输入端相连,所述第一接地阶梯阻抗谐振器6与第一输出端馈线2的输出端相连,第二接地阶梯阻抗谐振器7与第二输出端馈线3的输出端相连,第一接地阶梯阻抗谐振器6、第二接地阶梯阻抗谐振器7、第三接地阶梯阻抗谐振器8的另一端穿过介质基板101与金属接地板102相连。The input ends of the first three-mode resonator 4 and the second three-mode resonator 5 are respectively coupled to the input feeder 1, and the output ends thereof are respectively coupled to the first output feeder 2 and the second output feeder 3, and the The third grounded ladder impedance resonator 8 is connected to the input ends of the first output end feeder 2 and the second output end feeder 3, and the first grounded ladder impedance resonator 6 is connected to the output end of the first output end feeder 2. Two grounding ladder impedance resonators 7 are connected to the output end of the second output end feeder 3, and the other end of the first grounding ladder impedance resonator 6, the second grounding ladder impedance resonator 7, and the third grounding ladder impedance resonator 8 pass through The dielectric substrate 101 is connected to the metal ground plate 102 .

如图1所示,所述介质基板101为矩形,输入端馈线1靠近其一个宽边,输入端设在该宽边上,第一输出端馈线2、第二输出端馈线3靠近另一个宽边,第一输出端、第二输出端分别设在相对的两个窄边上。As shown in Figure 1, the dielectric substrate 101 is rectangular, the input end feeder 1 is close to one wide side, the input end is arranged on the wide side, and the first output end feeder 2 and the second output end feeder 3 are close to the other wide side. side, the first output end and the second output end are respectively arranged on two opposite narrow sides.

如图2所示,所述输入端馈线1包括与矩形介质基板101宽边垂直的第一50欧姆微带线导带11、与该宽边平行的第一半波长主传输线12和第二半波长主传输线13,所述第一50欧姆微带线导带11的输入端位于矩形介质基板101的一个宽边中点,其输入端同时与第一半波长主传输线12和第二半波长主传输线13的始端相连,第一半波长主传输线12、第二半波长主传输线13的终端通过连通柱与金属接地板102相连。As shown in FIG. 2, the input feeder 1 includes a first 50-ohm microstrip conduction strip 11 perpendicular to the broadside of a rectangular dielectric substrate 101, a first half-wavelength main transmission line 12 and a second half-wavelength parallel to the broadside. The main wavelength transmission line 13, the input end of the first 50 ohm microstrip line conduction band 11 is located at the midpoint of a wide side of the rectangular dielectric substrate 101, and its input end is connected to the first half-wavelength main transmission line 12 and the second half-wavelength main transmission line simultaneously. The beginning ends of the transmission lines 13 are connected, and the ends of the first half-wavelength main transmission line 12 and the second half-wavelength main transmission line 13 are connected to the metal ground plate 102 through connecting posts.

如图2所示,所述第一输出端馈线2包括与矩形介质基板101宽边平行的第二50欧姆微带线导带21和第一微带传输线22以及与矩形介质基板101宽边垂直的第一四分之一波长耦合线23;As shown in FIG. 2 , the first output feeder 2 includes a second 50-ohm microstrip line conduction strip 21 parallel to the broadside of the rectangular dielectric substrate 101 and a first microstrip transmission line 22 and perpendicular to the broadside of the rectangular dielectric substrate 101. The first quarter wavelength coupling line 23;

所述第一微带传输线22的输入端与第一四分之一波长耦合线23的输出端相连,其输出端与第二50欧姆微带线导带21的输入端相连,所述第二50欧姆微带线导带21的输出端位于矩形介质基板101的一个窄边上;The input end of the first microstrip transmission line 22 is connected to the output end of the first quarter-wavelength coupled line 23, and its output end is connected to the input end of the second 50 ohm microstrip line conduction band 21, and the second The output end of the 50-ohm microstrip conduction tape 21 is located on a narrow side of the rectangular dielectric substrate 101;

所述第一接地阶梯阻抗谐振器6包括第一高阻抗谐振器61与第一低阻抗谐振器62,第一低阻抗谐振器62的一端与第一微带传输线22垂直相连;The first grounded ladder impedance resonator 6 includes a first high-impedance resonator 61 and a first low-impedance resonator 62, and one end of the first low-impedance resonator 62 is vertically connected to the first microstrip transmission line 22;

所述第二输出端馈线3包括与矩形介质基板101宽边平行的第三50欧姆微带线导带31和第二微带传输线32以及与矩形介质基板101宽边垂直的第二四分之一波长耦合线33;The second output feeder 3 includes a third 50 ohm microstrip line conduction strip 31 parallel to the wide side of the rectangular dielectric substrate 101 and a second microstrip transmission line 32, and a second quarter of the line perpendicular to the wide side of the rectangular dielectric substrate 101 A wavelength coupling line 33;

所述第二微带传输线32的输入端与第二四分之一波长耦合线33的输出端相连,其输出端与第三50欧姆微带线导带31的输入端相连,所述第三50欧姆微带线导带31的输出端位于矩形介质基板101的另一个窄边上;The input end of the second microstrip transmission line 32 is connected to the output end of the second quarter wavelength coupling line 33, and its output end is connected to the input end of the third 50 ohm microstrip line conduction band 31, and the third The output end of the 50-ohm microstrip conduction tape 31 is located on the other narrow side of the rectangular dielectric substrate 101;

所述第二接地阶梯阻抗谐振器7包括第二高阻抗谐振器71与第二低阻抗谐振器72,第二低阻抗谐振器72的一端与第二微带传输线32垂直相连;The second grounded ladder impedance resonator 7 includes a second high-impedance resonator 71 and a second low-impedance resonator 72, and one end of the second low-impedance resonator 72 is vertically connected to the second microstrip transmission line 32;

所述第三接地阶梯阻抗谐振器8包括第三高阻抗谐振器81与第三低阻抗谐振器82,第三低阻抗谐振器82的一端与第一四分之一波长耦合线23和第二四分之一波长耦合线33输入端相连。The third grounded ladder impedance resonator 8 includes a third high-impedance resonator 81 and a third low-impedance resonator 82, one end of the third low-impedance resonator 82 is connected to the first quarter wavelength coupling line 23 and the second The quarter wavelength coupling line 33 is connected to the input end.

如图2所示,所述第一三模谐振器4包括第一四分之一波长谐振器41、第二四分之一波长谐振器42、第一对称面枝节加载低阻抗谐振器43、第一对称面枝节加载高阻抗谐振器44,As shown in FIG. 2, the first three-mode resonator 4 includes a first quarter-wavelength resonator 41, a second quarter-wavelength resonator 42, a first symmetrical plane stub-loaded low-impedance resonator 43, The first symmetrical plane stub loads the high impedance resonator 44,

所述第一四分之一波长谐振器41与矩形介质基板101宽边平行,第二四分之一波长谐振器42与矩形介质基板101宽边垂直,第一对称面枝节加载低阻抗谐振器43的轴线和第一对称面枝节加载高阻抗谐振器44的轴线均与矩形介质基板101宽边成45度角,The first quarter-wavelength resonator 41 is parallel to the broadside of the rectangular dielectric substrate 101, the second quarter-wavelength resonator 42 is perpendicular to the broadside of the rectangular dielectric substrate 101, and the first symmetrical plane branch loads the low-impedance resonator The axis of 43 and the axis of the high-impedance resonator 44 loaded with stubs on the first symmetry plane both form an angle of 45 degrees with the wide side of the rectangular dielectric substrate 101,

第一对称面枝节加载低阻抗谐振器43的一端同时与第一四分之一波长谐振器41的输出端和第二四分之一波长谐振器42的输入端相连,其另一端与第一对称面枝节加载高阻抗谐振器44的中轴相连,One end of the first symmetry plane stub loaded low-impedance resonator 43 is connected with the output end of the first quarter wavelength resonator 41 and the input end of the second quarter wavelength resonator 42 simultaneously, and its other end is connected with the first The central axis of the high-impedance resonator 44 loaded on the branches of the symmetrical plane is connected,

所述第一四分之一波长谐振器41与第一半波长主传输线12平行耦合,第二四分之一波长谐振器42与第一四分之一波长耦合线23平行耦合;The first quarter-wavelength resonator 41 is coupled in parallel with the first half-wavelength main transmission line 12, and the second quarter-wavelength resonator 42 is coupled in parallel with the first quarter-wavelength coupling line 23;

所述第二三模谐振器5包括第三四分之一波长谐振器51、第四四分之一波长谐振器52、第二对称面枝节加载低阻抗谐振器53、第二对称面枝节加载高阻抗谐振器54,The second three-mode resonator 5 includes a third quarter-wavelength resonator 51, a fourth quarter-wavelength resonator 52, a second symmetrical plane stub-loaded low-impedance resonator 53, a second symmetrical plane stub-loaded high impedance resonator 54,

所述第三四分之一波长谐振器51与矩形介质基板101宽边平行,第四四分之一波长谐振器52与矩形介质基板101宽边垂直,第二对称面枝节加载低阻抗谐振器53的轴线和第二对称面枝节加载高阻抗谐振器54的轴线均与矩形介质基板101宽边成135度角,The third quarter-wavelength resonator 51 is parallel to the broadside of the rectangular dielectric substrate 101, the fourth quarter-wavelength resonator 52 is perpendicular to the broadside of the rectangular dielectric substrate 101, and the second symmetrical plane branch loads the low-impedance resonator The axis of 53 and the axis of the second symmetry plane stub-loaded high-impedance resonator 54 form an angle of 135 degrees with the wide side of the rectangular dielectric substrate 101,

第二对称面枝节加载低阻抗谐振器53的一端同时与第三四分之一波长谐振器51的输出端和第四四分之一波长谐振器52的输入端相连,其另一端与第二对称面枝节加载高阻抗谐振器54的中轴相连,One end of the second symmetry plane stub loaded low-impedance resonator 53 is connected with the output end of the third quarter-wavelength resonator 51 and the input end of the fourth quarter-wavelength resonator 52 simultaneously, and its other end is connected with the second The central axis of the high-impedance resonator 54 loaded on the branches of the symmetrical plane is connected,

所述第三四分之一波长谐振器51与第二半波长主传输线13平行耦合,第四四分之一波长谐振器52与第二四分之一波长耦合线33平行耦合。The third quarter-wavelength resonator 51 is coupled in parallel with the second half-wavelength main transmission line 13 , and the fourth quarter-wavelength resonator 52 is coupled in parallel with the second quarter-wavelength coupling line 33 .

本发明基于分立元件隔离网络及三模谐振器的宽带功分滤波器,其中第一三模谐振器4和第二三模谐振器5的第一四分之一波长谐振器41、第二四分之一波长谐振器42、第三四分之一波长谐振器51、第四四分之一波长谐振器52的长度和宽度决定了通带的位置,调节第一对称面枝节加载低阻抗谐振器43、第一对称面枝节加载高阻抗谐振器44、第二对称面枝节加载低阻抗谐振器53、第二对称面枝节加载高阻抗谐振器54可以改变两个模式的位置,从而使得通带更加平坦;第一半波长主传输线12和第二半波长主传输线13分别和与其平行耦合的第一四分之一波长谐振器41、第三四分之一波长谐振器51的间距对其耦合的强度影响较大,间距越小耦合强度越大,两个输出端口的幅度和相位吻合度越高;调节第一接地阶梯阻抗谐振器6、第二接地阶梯阻抗谐振器7和第三接地阶梯阻抗谐振器8的第一高阻抗谐振器61与第一低阻抗谐振器62、第二高阻抗谐振器71与第二低阻抗谐振器72和第三高阻抗谐振器81与第三低阻抗谐振器82的阻抗比和长度可以改变电路奇偶模输入阻抗并使两者幅度差减小,从而同时产生较好的带内隔离度和带外谐波抑制。The present invention is based on the broadband power division filter of the discrete component isolation network and the three-mode resonator, wherein the first quarter-wavelength resonator 41 of the first three-mode resonator 4 and the second three-mode resonator 5, the second four The length and width of the quarter-wavelength resonator 42, the third quarter-wavelength resonator 51, and the fourth quarter-wavelength resonator 52 determine the position of the passband, and adjust the low-impedance resonant load of the first symmetrical plane stub The device 43, the first symmetry plane stub loading high impedance resonator 44, the second symmetry plane stub loading low impedance resonator 53, and the second symmetry plane stub loading high impedance resonator 54 can change the positions of the two modes, so that the passband More flat; the first half-wavelength main transmission line 12 and the second half-wavelength main transmission line 13 are respectively coupled with the first quarter-wavelength resonator 41 and the third quarter-wavelength resonator 51 in parallel with the distance between them The strength of the influence is greater, the smaller the spacing, the greater the coupling strength, the higher the amplitude and phase coincidence of the two output ports; adjust the first grounding ladder impedance resonator 6, the second grounding ladder impedance resonator 7 and the third grounding ladder The first high-impedance resonator 61 and the first low-impedance resonator 62 of the impedance resonator 8, the second high-impedance resonator 71 and the second low-impedance resonator 72, and the third high-impedance resonator 81 and the third low-impedance resonator The impedance ratio and length of the circuit breaker 82 can change the odd and even mode input impedance of the circuit and reduce the amplitude difference between them, thereby simultaneously producing better in-band isolation and out-of-band harmonic suppression.

本发明基于分立元件隔离网络及三模谐振器的宽带功分滤波器,在制造上通过印制电路板制造工艺对电路基板正面及背面的金属面进行加工腐蚀从而形成所需的金属图案。The present invention is based on the broadband power dividing filter of the discrete element isolation network and the three-mode resonator. In manufacturing, the metal surface of the front and back of the circuit substrate is processed and corroded by the printed circuit board manufacturing process to form the required metal pattern.

下面结合具体实施例对本发明作进一步详细描述。The present invention will be further described in detail below in conjunction with specific embodiments.

实施例Example

基于分立元件隔离网络及三模谐振器的宽带功分滤波器的结构如图1所示,俯视图如图2所示,有关尺寸规格如图3所示。所采用的介质基板10相对介电常数为3.55,厚度为0.508mm,损耗角正切为0.0027。输入端50欧姆微带线导带11、二端口输出端50欧姆微带线导带21和三端口输出端50欧姆微带线导带31的特性阻抗均为50欧姆,其宽度均为W1=1.08mm。结合图3,功分滤波器的各尺寸参数如下:W1=1.08mm,L1=24.3mm,W2=0.26mm,L2=1.74mm,W3=0.26mm,L3=14.5mm,W4=5mm,L4=22mm,W5=0.2mm,L5=3.8mm,W6=0.1mm,L6=12.4mm,W7=0.26mm,L7=23mm,W8=0.9mm,L8=2mm,W9=0.2mm,L9=10.2mm,W10=0.1mm,L10=10.2mm,W11=1.8mm,L11=7.3mm,L12=7.3mm,L13=0.92mm,L14=0.97mm,g1=0.13mm,g2=0.11mm。功分滤波器的整体面积为32×60mm,对应的导波长尺寸为0.47λg×0.88λg,其中λg为通带中心频率对应的导波波长。The structure of the broadband power divider filter based on discrete component isolation network and three-mode resonator is shown in Figure 1, the top view is shown in Figure 2, and the relevant dimensions are shown in Figure 3. The dielectric substrate 10 used has a relative permittivity of 3.55, a thickness of 0.508 mm, and a loss tangent of 0.0027. The characteristic impedance of the 50-ohm microstrip line conduction tape 11 at the input end, the 50-ohm microstrip line conduction tape 21 at the two-port output end, and the 50-ohm microstrip line conduction tape 31 at the three-port output end are all 50 ohms, and their widths are all W 1 = 1.08 mm. With reference to Figure 3, the size parameters of the power division filter are as follows: W 1 =1.08mm, L 1 =24.3mm, W 2 =0.26mm, L 2 =1.74mm, W 3 =0.26mm, L 3 =14.5mm, W 4 =5mm, L 4 =22mm, W 5 =0.2mm, L 5 =3.8mm, W 6 =0.1mm, L 6 =12.4mm, W 7 =0.26mm, L 7 =23mm, W 8 =0.9mm , L 8 =2 mm, W 9 =0.2 mm, L 9 =10.2 mm, W 10 =0.1 mm, L 10 =10.2 mm, W 11 =1.8 mm, L 11 =7.3 mm, L 12 =7.3 mm, L 13 =0.92 mm, L 14 =0.97 mm, g 1 =0.13 mm, g 2 =0.11 mm. The overall area of the power dividing filter is 32×60mm, and the corresponding guide wavelength size is 0.47λ g ×0.88λ g , where λ g is the guide wavelength corresponding to the center frequency of the passband.

本实例功分滤波器是在电磁仿真软件HFSS.13中建模仿真的。图4是本实例中功分滤波器的S参数仿真图,从图中可以看出,该功分滤波器的通带中心频率为2.4GHz,相对带宽为33%,通带内回波损耗低于15dB。通带外分别有四个传输零点使得该实例功分滤波器具有很好的选择性。The power dividing filter of this example is modeled and simulated in the electromagnetic simulation software HFSS.13. Figure 4 is the S-parameter simulation diagram of the power division filter in this example. It can be seen from the figure that the passband center frequency of the power division filter is 2.4GHz, the relative bandwidth is 33%, and the return loss in the passband is low at 15dB. There are four transmission zeros outside the passband respectively, which make the power division filter of this example have good selectivity.

图5是本实例中功分滤波器的两个输出端口幅度差,从图中可以看出,该实例功分滤波器通带内的两个平衡输出端口幅度差在0.012dB以内。Figure 5 shows the amplitude difference between the two output ports of the power division filter in this example. It can be seen from the figure that the amplitude difference between the two balanced output ports within the passband of the power division filter in this example is within 0.012dB.

图6是本实例中功分滤波器的两个输出端口相位差,从图中可以看出,该实例功分滤波器通带内的两个平衡输出端口相位差在0±1.2度以内。Figure 6 shows the phase difference between the two output ports of the power division filter in this example. It can be seen from the figure that the phase difference between the two balanced output ports within the passband of the power division filter in this example is within 0±1.2 degrees.

综上所述,本发明基于分立元件隔离网络及三模谐振器的宽带功分滤波器,结合三模谐振器和终端短路的阶梯阻抗谐振器特性实现了一种选择性好、隔离度高、谐波抑制好的三模宽带功分滤波器,该功分滤波器非常适用于现代无线通信系统。In summary, the present invention is based on a discrete component isolation network and a broadband power dividing filter of a three-mode resonator, combined with the three-mode resonator and the stepped impedance resonator characteristics of the terminal short circuit to achieve a good selectivity, high isolation, A three-mode broadband power divider filter with good harmonic suppression, which is very suitable for modern wireless communication systems.

Claims (5)

1.一种宽带功分滤波器,其特征在于:包括下表面覆有金属接地板(102)的介质基板(101),1. a broadband power division filter, is characterized in that: comprise the dielectric substrate (101) that lower surface is covered with metal ground plate (102), 在所述介质基板(101)的上表面设有输入端馈线(1)、第一输出端馈线(2)、第二输出端馈线(3)、第一三模谐振器(4)、第二三模谐振器(5)、第一接地阶梯阻抗谐振器(6)、第二接地阶梯阻抗谐振器(7)、第三接地阶梯阻抗谐振器(8)、隔离电阻(9)。On the upper surface of the dielectric substrate (101) are provided an input end feeder (1), a first output end feeder (2), a second output end feeder (3), a first three-mode resonator (4), a second A three-mode resonator (5), a first grounded ladder impedance resonator (6), a second grounded ladder impedance resonator (7), a third grounded ladder impedance resonator (8), and an isolation resistor (9). 所述第一三模谐振器(4)、第二三模谐振器(5)的输入端分别与输入端馈线(1)耦合,其输出端分别与第一输出端馈线(2)、第二输出端馈线(3)耦合,所述第三接地阶梯阻抗谐振器(8)与第一输出端馈线(2)和第二输出端馈线(3)相连,所述第一接地阶梯阻抗谐振器(6)与第一输出端馈线(2)的输出端相连,第二接地阶梯阻抗谐振器(7)与第二输出端馈线(3)的输出端相连,第一接地阶梯阻抗谐振器(6)、第二接地阶梯阻抗谐振器(7)、第三接地阶梯阻抗谐振器(8)的另一端穿过介质基板(101)与金属接地板(102)相连。The input ends of the first three-mode resonator (4) and the second three-mode resonator (5) are respectively coupled with the input feeder (1), and the output ends are respectively connected with the first output feeder (2), the second The output feeder (3) is coupled, the third grounded ladder impedance resonator (8) is connected to the first output feeder (2) and the second output feeder (3), and the first grounded ladder impedance resonator ( 6) Connected to the output end of the first output end feeder (2), the second grounding ladder impedance resonator (7) is connected to the output end of the second output end feeder line (3), the first grounding ladder impedance resonator (6) The other ends of the second grounded ladder impedance resonator (7) and the third grounded ladder impedance resonator (8) are connected to the metal ground plate (102) through the dielectric substrate (101). 2.根据权利要求1所述的宽带功分滤波器,其特征在于:所述介质基板(101)为矩形,输入端馈线(1)靠近其一个宽边,输入端设在该宽边上,第一输出端馈线(2)、第二输出端馈线(3)靠近另一个宽边,第一输出端、第二输出端分别设在相对的两个窄边上。2. broadband power dividing filter according to claim 1, is characterized in that: described dielectric substrate (101) is rectangular, and input end feeder (1) is close to one broadside thereof, and input end is located on this broadside, The first output end feeder (2) and the second output end feeder (3) are close to the other broad side, and the first output end and the second output end are respectively arranged on two opposite narrow sides. 3.根据权利要求2所述的宽带功分滤波器,其特征在于:3. broadband power division filter according to claim 2, is characterized in that: 所述输入端馈线(1)包括与矩形介质基板(101)宽边垂直的第一50欧姆微带线导带(11)、与该宽边平行的第一半波长主传输线(12)和第二半波长主传输线(13),所述第一50欧姆微带线导带(11)的输入端位于矩形介质基板(101)的一个宽边中点,其输入端同时与第一半波长主传输线(12)和第二半波长主传输线(13)的始端相连。The input feeder (1) includes a first 50-ohm microstrip conduction strip (11) perpendicular to the broadside of the rectangular dielectric substrate (101), a first half-wavelength main transmission line (12) parallel to the broadside, and a second Two half-wavelength main transmission lines (13), the input end of the first 50 ohm microstrip line conduction band (11) is located at a broadside midpoint of the rectangular dielectric substrate (101), and its input end is connected to the first half-wavelength main transmission line simultaneously. The transmission line (12) is connected to the beginning of the second half-wavelength main transmission line (13). 4.根据权利要求3所述的宽带功分滤波器,其特征在于:4. broadband power division filter according to claim 3, is characterized in that: 所述第一输出端馈线(2)包括与矩形介质基板(101)宽边平行的第二50欧姆微带线导带(21)和第一微带传输线(22)以及与矩形介质基板(101)宽边垂直的第一四分之一波长耦合线(23);The first output feeder (2) includes a second 50 ohm microstrip line conduction strip (21) parallel to the wide side of the rectangular dielectric substrate (101) and a first microstrip transmission line (22) and a rectangular dielectric substrate (101) ) a first quarter-wavelength coupling line (23) perpendicular to the broadside; 所述第一微带传输线(22)的输入端与第一四分之一波长耦合线(23)的输出端相连,其输出端与第二50欧姆微带线导带(21)的输入端相连,所述第二50欧姆微带线导带(21)的输出端位于矩形介质基板(101)的一个窄边上;The input end of the first microstrip transmission line (22) is connected with the output end of the first quarter wavelength coupling line (23), and its output end is connected with the input end of the second 50 ohm microstrip line conduction band (21) connected, the output end of the second 50 ohm microstrip line conduction tape (21) is located on a narrow side of the rectangular dielectric substrate (101); 所述第一接地阶梯阻抗谐振器(6)包括第一高阻抗谐振器(61)和第一低阻抗谐振器(62),第一低阻抗谐振器(62)的一端与第一微带传输线(22)垂直相连;The first grounding ladder impedance resonator (6) includes a first high impedance resonator (61) and a first low impedance resonator (62), and one end of the first low impedance resonator (62) is connected to the first microstrip transmission line (22) vertically connected; 所述第二输出端馈线(3)包括与矩形介质基板(101)宽边平行的第三50欧姆微带线导带(31)和第二微带传输线(32)以及与矩形介质基板(101)宽边垂直的第二四分之一波长耦合线(33);The second output feeder (3) includes a third 50-ohm microstrip line conduction strip (31) parallel to the wide side of the rectangular dielectric substrate (101) and a second microstrip transmission line (32) and a rectangular dielectric substrate (101) ) a second quarter-wavelength coupling line (33) perpendicular to the broadside; 所述第二微带传输线(32)的输入端与第二四分之一波长耦合线(33)的输出端相连,其输出端与第三50欧姆微带线导带(31)的输入端相连,所述第三50欧姆微带线导带(31)的输出端位于矩形介质基板(101)的另一个窄边上;The input end of the second microstrip transmission line (32) is connected with the output end of the second quarter wavelength coupling line (33), and its output end is connected with the input end of the third 50 ohm microstrip line conduction band (31) connected, the output end of the third 50 ohm microstrip line conduction tape (31) is located on the other narrow side of the rectangular dielectric substrate (101); 所述第二接地阶梯阻抗谐振器(7)包括第二高阻抗谐振器(71)和第二低阻抗谐振器(72),第二低阻抗谐振器(72)的一端与第二微带传输线(32)垂直相连;The second grounding ladder impedance resonator (7) includes a second high impedance resonator (71) and a second low impedance resonator (72), and one end of the second low impedance resonator (72) is connected to the second microstrip transmission line (32) Vertical connection; 所述第三接地阶梯阻抗谐振器(8)包括第三高阻抗谐振器(81)和第三低阻抗谐振器(82),第三低阻抗谐振器(8)的一端分别与第一四分之一波长耦合线(23)和第二四分之一波长耦合线(33)的输入端相连。Described the 3rd grounding ladder impedance resonator (8) comprises the 3rd high impedance resonator (81) and the 3rd low impedance resonator (82), one end of the 3rd low impedance resonator (8) is connected with the first quarter respectively The one-wavelength coupled line (23) is connected to the input end of the second quarter-wavelength coupled line (33). 5.根据权利要求4所述的宽带功分滤波器,其特征在于:5. broadband power division filter according to claim 4, is characterized in that: 所述第一三模谐振器(4)包括第一四分之一波长谐振器(41)、第二四分之一波长谐振器(42)、第一对称面枝节加载低阻抗谐振器(43)、第一对称面枝节加载高阻抗谐振器(44),The first three-mode resonator (4) includes a first quarter-wavelength resonator (41), a second quarter-wavelength resonator (42), a first symmetrical plane stub-loaded low-impedance resonator (43 ), the first symmetry plane stub loaded high impedance resonator (44), 所述第一四分之一波长谐振器(41)与矩形介质基板(101)宽边平行,第二四分之一波长谐振器(42)与矩形介质基板(101)宽边垂直,第一对称面枝节加载低阻抗谐振器(43)的轴线和第一对称面枝节加载高阻抗谐振器(44)的轴线均与矩形介质基板(101)宽边成45度角,The first quarter-wavelength resonator (41) is parallel to the broadside of the rectangular dielectric substrate (101), the second quarter-wavelength resonator (42) is perpendicular to the broadside of the rectangular dielectric substrate (101), and the first The axis of the low-impedance resonator (43) loaded with branches on the symmetry plane and the axis of the high-impedance resonator (44) loaded with branches on the first symmetry plane form an angle of 45 degrees with the wide side of the rectangular dielectric substrate (101), 第一对称面枝节加载低阻抗谐振器(43)的一端同时与第一四分之一波长谐振器(41)的输出端和第二四分之一波长谐振器(42)的输入端相连,其另一端与第一对称面枝节加载高阻抗谐振器(44)的中轴相连,One end of the first symmetry plane stub loaded low-impedance resonator (43) is simultaneously connected with the output end of the first quarter-wavelength resonator (41) and the input end of the second quarter-wavelength resonator (42), Its other end is connected with the central axis of the first symmetry plane branch-loaded high-impedance resonator (44), 所述第一四分之一波长谐振器(41)与第一半波长主传输线(12)平行耦合,第二四分之一波长谐振器(42)与第一四分之一波长耦合线(23)平行耦合;The first quarter-wavelength resonator (41) is coupled in parallel with the first half-wavelength main transmission line (12), and the second quarter-wavelength resonator (42) is coupled with the first quarter-wavelength coupling line ( 23) Parallel coupling; 所述第二三模谐振器(5)包括第三四分之一波长谐振器(51)、第四四分之一波长谐振器(52)、第二对称面枝节加载低阻抗谐振器(53)、第二对称面枝节加载高阻抗谐振器(54),The second three-mode resonator (5) includes a third quarter-wavelength resonator (51), a fourth quarter-wavelength resonator (52), a second symmetrical plane stub-loaded low-impedance resonator (53 ), the second symmetry plane stub loaded high impedance resonator (54), 所述第三四分之一波长谐振器(51)与矩形介质基板(101)宽边平行,第四四分之一波长谐振器(52)与矩形介质基板(101)宽边垂直,第二对称面枝节加载低阻抗谐振器(53)的轴线和第二对称面枝节加载高阻抗谐振器(54)的轴线均与矩形介质基板(101)宽边成135度角,The third quarter-wavelength resonator (51) is parallel to the broadside of the rectangular dielectric substrate (101), the fourth quarter-wavelength resonator (52) is perpendicular to the broadside of the rectangular dielectric substrate (101), and the second The axis of the low-impedance resonator (53) loaded with branches on the symmetry plane and the axis of the high-impedance resonator (54) loaded with the branches on the second symmetry plane form an angle of 135 degrees with the wide side of the rectangular dielectric substrate (101), 第二对称面枝节加载低阻抗谐振器(53)的一端同时与第三四分之一波长谐振器(51)的输出端和第四四分之一波长谐振器(52)的输入端相连,其另一端与第二对称面枝节加载高阻抗谐振器(54)的中轴相连,One end of the second symmetry plane stub loaded low-impedance resonator (53) is simultaneously connected with the output end of the third quarter-wavelength resonator (51) and the input end of the fourth quarter-wavelength resonator (52), Its other end is connected with the central axis of the second symmetry plane branch-loaded high-impedance resonator (54), 所述第三四分之一波长谐振器(51)与第二半波长主传输线(13)平行耦合,第四四分之一波长谐振器(52)与第二四分之一波长耦合线(33)平行耦合。The third quarter-wavelength resonator (51) is coupled in parallel with the second half-wavelength main transmission line (13), and the fourth quarter-wavelength resonator (52) is coupled with the second quarter-wavelength coupling line ( 33) Parallel coupling.
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CN106848511A (en) * 2017-03-24 2017-06-13 电子科技大学 A kind of double frequency filtering power splitter for being applied to WLAN
CN109326855A (en) * 2018-08-31 2019-02-12 南京师范大学 A Novel Broadband Quad-Power Filter
CN109273807A (en) * 2018-09-13 2019-01-25 南京师范大学 A new type of high performance broadband four-power split filter
CN110137641A (en) * 2019-06-17 2019-08-16 辽宁工程技术大学 A kind of miniature double trap ultra-wide band filters based on the type of falling π resonator
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CN110518316A (en) * 2019-09-07 2019-11-29 西南交通大学 A kind of multifrequency band-pass filter based on single minor matters load multimode resonator
CN111628257A (en) * 2020-06-01 2020-09-04 中天宽带技术有限公司 Filtering power divider
CN112133992A (en) * 2020-10-15 2020-12-25 北京邮电大学 Filtering power divider with high out-of-band rejection and full-band absorption functions
CN112133992B (en) * 2020-10-15 2021-06-08 北京邮电大学 Filtering power divider with high out-of-band rejection and full-band absorption functions
CN113381142A (en) * 2021-05-21 2021-09-10 南京智能高端装备产业研究院有限公司 Three-passband power division filter with high frequency selectivity
CN113381143A (en) * 2021-06-03 2021-09-10 南京工程学院 Microstrip low-pass filter and transmission zero determination and frequency setting method
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