CN112290184B - Broadband power combiner with filtering characteristic - Google Patents
Broadband power combiner with filtering characteristic Download PDFInfo
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- CN112290184B CN112290184B CN202011057258.7A CN202011057258A CN112290184B CN 112290184 B CN112290184 B CN 112290184B CN 202011057258 A CN202011057258 A CN 202011057258A CN 112290184 B CN112290184 B CN 112290184B
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- 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
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Abstract
The application belongs to the technical field of radio frequency microwave, and particularly relates to a broadband power combiner with a filtering characteristic. The broadband power combiner comprises a first microstrip line, one end of the first microstrip line is connected with a first port, the other end of the first microstrip line is connected with the starting ends of two power distribution modules side by side, the tail end of any power distribution module is connected with a second microstrip line through a filter module, any second microstrip line is connected with a second port, when the first port serves as an input end, the two second ports serve as output ends, the filter module comprises a short-circuit coupling line and a transmission line, the transmission line comprises a first end connected with the power distribution modules and a second end connected with the second microstrip line, the short-circuit coupling line comprises two microstrip structures which are respectively started from two ends of the transmission line and oppositely extend to a cross region. The invention can replace the situation of cascade connection of the power combiner and the filter in a microwave circuit system, remove the use of the filter connected with the rear end of the power combiner, reduce the insertion loss of the circuit, reduce the volume of the circuit and save the cost.
Description
Technical Field
The application belongs to the technical field of radio frequency microwave, and particularly relates to a broadband power combiner with a filtering characteristic.
Background
Filters and power splitters are important components in radio frequency and microwave communication systems, and filters are two-port networks that have frequency selective characteristics, i.e., signals can be transmitted unattenuated in the pass band and completely un-transmitted in the stop band. The power divider is a multi-port passive microwave device and has the function of dividing the power of an input signal to each output port according to a certain proportion. The power divider can also be reversely used as a power synthesizer, and microwave signals of all paths can be superposed through the power synthesizer to obtain required output power.
Most of the existing microstrip power combiners adopt a Wilkinson form, as shown in fig. 1, and each output port of the existing microstrip power combiner can obtain output signals with equal size and same phase under the condition of equal division. In addition to the requirement that the power combiner be structurally reduced in size and functionally reduced in insertion loss, modern microwave solid-state circuits are also required to be capable of achieving wider bandwidths, i.e., achieving the required performance in wider frequency bands, which is a trend in the future development of power combiners.
In the power distribution/synthesis network, in order to improve the selectivity of the system for suppressing harmonics, an additional filter is required to eliminate noise, interference and harmonics caused by the nonlinear device, but this will increase the overall size of the system, and will also increase the loss of the circuit, which is disadvantageous to the cost of the circuit design. The frequency selective power synthesizer is realized by integrally designing the functional combiner and the filter, thereby avoiding unnecessary harmonic waves at the input or output port during power distribution/synthesis, and reducing the size and loss of the whole system. Therefore, the functional combiner with filtering performance has important application in power distribution/synthesis network ports, for example, if two devices are integrated, on one hand, the total insertion loss of a circuit can be reduced, on the other hand, a circuit system can be miniaturized, and the cost can be reduced.
Disclosure of Invention
Aiming at the condition that the output end of a power combiner in a solid-state power amplification module needs to be additionally cascaded with a filter to inhibit harmonic waves, the added devices can cause the increase of the system link area and the increase of insertion loss. Therefore, the broadband Wilkinson power combiner with the filtering characteristic is designed, the broadband Wilkinson power combiner can integrate two functions of power combining and filtering, the link area of a system is reduced, the miniaturization of a circuit is realized, and meanwhile, the broadband Wilkinson power combiner has the broadband characteristic and can be applied to a broadband power combiner system.
The application provides broadband power combiner with filtering characteristic mainly includes:
the utility model provides a power distribution module, including first microstrip line, its one end is connected with first port, and the other end is connected two initiating terminals of dividing the module side by side, arbitrary the end of dividing the module through a filtering module connects a second microstrip line, arbitrary second microstrip line is connected with a second port, works as when first port is as the input, two the second port is the output, vice versa, wherein, filtering module includes short circuit coupling line and transmission line, the transmission line include with the first end that the module is connected is divided to the merit, and with the second end that the second microstrip line is connected, short circuit coupling line include two respectively certainly transmission line both ends are originated to extend to the microstrip structure in cross area in opposite directions.
Preferably, the transmission line and the short-circuit coupling line form a substantially quadrangular structure.
Preferably, the power dividing module gradually widens from the beginning to the end and transitions according to a gradual change function.
Preferably, the gradient function is:
w(y)＝(b-a)-(b-a)sin 2 (πy/2l)
wherein, a and b are the widths of the beginning end and the end of the gradual change line respectively, and l is the length of the gradual change line.
Preferably, the transition line length is λ/4.
Preferably, the short-circuit coupling line length is λ/4 and the parallel transmission line length is 3 λ/4.
Preferably, the bend of the microstrip line of the transmission line is subjected to a corner treatment.
Preferably, an isolation resistor is arranged between the ends of the two power dividing modules.
The invention can replace the situation of cascade connection of the power combiner and the filter in a microwave circuit system, remove the use of the filter connected with the rear end of the power combiner, reduce the insertion loss of the circuit, reduce the volume of the circuit and save the cost.
Drawings
Fig. 1 is a diagram of a Wilkinson power combiner model of the related art.
Fig. 2 is a diagram of a functional combiner model of a preferred embodiment of the wideband functional combiner with filtering characteristics according to the present application.
Fig. 3 is a schematic diagram of a wideband Wilkinson power combiner with filtering characteristics according to the embodiment shown in fig. 2 of the present application.
Fig. 4 is a schematic diagram of the Wilkinson power combiner application of the embodiment of fig. 2 of the present application.
The device comprises a first microstrip line 1, a power division module 2, a filtering module 3, a short-circuit coupling line 31, a transmission line 32, a second microstrip line 4 and an isolation resistor 5.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.
The present application provides a wideband power combiner with filtering characteristics, as shown in fig. 2 to fig. 3, which mainly includes:
One end of a first microstrip line 1 is connected with a first port, the other end of the first microstrip line is connected with the starting ends of two parallel power distribution modules 2, the tail end of any one power distribution module is connected with a second microstrip line 4 through a filter module 3, any one second microstrip line is connected with a second port, when the first port is used as an input end, the two second ports are output ends to realize power division, otherwise, when the first port is used as an output end, the two second ports are input ends to realize power combination, wherein, the filtering module 3 comprises a short-circuit coupling line 31 and a transmission line 32, the transmission line 32 comprises a first end connected with the power dividing module, and a second end connected to the second microstrip line, where the short-circuit coupling line 31 includes two microstrip structures starting from two ends of the transmission line and extending to the intersection area in opposite directions.
In some alternative embodiments, as shown in fig. 2, the transmission line 32 and the short-circuit coupling line 31 form a substantially quadrilateral structure, wherein the short-circuit coupling line 31 includes two parallel lines forming one side of the quadrilateral structure, and the transmission line 32 forms the other three sides of the quadrilateral structure.
In some optional embodiments, the power dividing module 2 gradually widens from the beginning to the end, and transitions according to a gradual function, where the gradual function is:
w(y)＝(b-a)-(b-a)sin 2 (πy/2l)
wherein, a and b are the widths of the beginning end and the end of the gradual change line respectively, and l is the length of the gradual change line.
In some alternative embodiments, the length of the tapered line is λ/4, where λ is an electrical length, and the electrical length is a physical quantity used to describe how frequently the waveform of the electromagnetic wave changes, for example, a transmission line with a physical length of 1m, and for two electromagnetic waves with wavelengths of 10cm and 1cm, the electrical lengths are 10 and 100, respectively, that is: a wave with a wavelength of 10cm changes by 10 cycles and a wave with a wavelength of 1cm changes by 100 cycles on a transmission line of one meter.
In some alternative embodiments, the short-circuited coupling line 31 has a length of λ/4, and the end-metalized hole is grounded. The parallel transmission lines 32 are 3 lambda/4 long. The connection part of the short-circuit coupling line 31 and the two sections of the transmission lines 32 is connected with the 50 omega microstrip line output.
In some alternative embodiments, all the microstrip line turns in the circuit including the transmission line 32 are subjected to the corner folding process.
In some alternative embodiments, an isolation resistor 5 is disposed between the ends of the two power dividing modules 2. The isolation resistor is designed at the tail end of the gradual change line, when the power combiner is used for power distribution, a common 100 omega patch resistor can be selected, if power combination is needed, a 100 omega high-power resistor needs to be selected, and the power resisting value of the resistor is half of the input power of a single port. The optimal simulation effect is achieved by optimizing the widths and the lengths of the gradient lines and the improved parallel coupling lines and the positions of the isolation resistors. In addition, the microstrip dielectric substrate is Rogers5880 with the substrate thickness of 20 mil. Fig. 3 is a schematic circuit diagram of the present application, where R is a resistor and Z represents a microstrip line equivalent impedance.
According to the parallel coupling input port, a 50-omega microstrip line is used as an input end, and the transition is made to an improved parallel coupling line end through a section of a gradual change line structure, so that the discontinuity is reduced, and the return loss of the input port is improved.
The invention has the following advantages:
for the circuit system, the combiner is integrated with the filter, and the dual functions of power distribution/synthesis and filtering are realized, as shown in fig. 4, which is an application in the power distribution/synthesis network. The invention can replace the situation of cascade connection of the power combiner and the filter in a microwave circuit system, removes the use of the filter connected with the rear end of the power combiner, reduces the insertion loss of the circuit, reduces the volume of the circuit and saves the cost.
Compared with the traditional Wilkinson power combiner (shown in figure 1), the mode of adopting gradual transition and loading improved parallel coupling lines (shown in figure 2) has obvious filtering characteristics and obviously improved bandwidth in the aspect of performance of the power combiner, and simulation results show that the bandwidth is obviously improved. In the frequency range of 5.7 GHz-11.6 GHz, the input return loss and the isolation are both larger than 15dB, the insertion loss is smaller than 0.5dB, the absolute bandwidth is 5.9GHz, the relative bandwidth is 68.2%, and the absolute bandwidth and the relative bandwidth are respectively improved by 1GHz and 11.6% compared with the traditional Wilkinson power combiner. The out-of-band attenuation of the low frequency band is greater than 15dB in the frequency range of 0-2.65 GHz, and the out-of-band attenuation of the high frequency band is greater than 15dB in the frequency range of 13.35 GHz-18 GHz.
The invention has strong universality, simple structure, easy processing and realization and batch production, and can be widely applied to C, X waveband broadband power synthesis networks and other microwave circuits.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. A wideband power combiner having filtering characteristics, comprising:
the power divider comprises a first microstrip line (1), one end of the first microstrip line is connected with a first port, the other end of the first microstrip line is connected with the starting ends of two parallel power dividing modules (2), the tail end of any power dividing module is connected with a second microstrip line (4) through a filter module (3), any second microstrip line is connected with a second port, when the first port serves as an input end, the two second ports serve as output ends, and vice versa, wherein the filter module (3) comprises a short-circuit coupling line (31) and a transmission line (32), the transmission line (32) comprises a first end connected with the power dividing modules and a second end connected with the second microstrip line, and the short-circuit coupling line (31) comprises two microstrip structures which start from the two ends of the transmission line respectively and extend oppositely to form two parallel microstrip structures;
The transmission line (32) and the short circuit coupling line (31) form a quadrilateral mechanism, the length of the short circuit coupling line (31) is lambda/4, the length of the parallel transmission line (32) is 3 lambda/4, lambda is the wavelength of electromagnetic waves, and an isolation resistor (5) is arranged between the tail ends of the two power division modules (2).
2. The wideband power combiner with filtering characteristics according to claim 1, wherein the power dividing module (2) gradually widens from the beginning to the end and transitions according to a gradual function.
3. The wideband power combiner with filtering characteristics according to claim 2, wherein said asymptotic function is:
w(y)＝(b-a)-(b-a)sin 2 (πy/2l)
wherein, a and b are the widths of the initial end and the tail end of the gradual change line respectively, and l is the length of the gradual change line.
4. The broadband power combiner having a filtering characteristic according to claim 3, wherein the length of the tapered line is λ/4, where λ is a wavelength of the electromagnetic wave.
5. The broadband power combiner with filtering characteristics according to claim 1, wherein the microstrip line of the transmission line (32) extending from the first end to the second end is bent twice to form three microstrip sections, and the bending position of the microstrip line is subjected to corner bending.
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| CN202011057258.7A CN112290184B (en) | 2020-09-30 | 2020-09-30 | Broadband power combiner with filtering characteristic |
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| CN202011057258.7A CN112290184B (en) | 2020-09-30 | 2020-09-30 | Broadband power combiner with filtering characteristic |
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| CN117335120B (en) * | 2023-11-21 | 2024-07-26 | 南通大学 | Directional coupler integrating filtering function |
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| CN102956948A (en) * | 2011-08-29 | 2013-03-06 | 黄森 | Novel ultra wide band Wilkinson power divider |
| 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 |
| CN111384535A (en) * | 2020-02-28 | 2020-07-07 | 南京智能高端装备产业研究院有限公司 | Double-passband power division filter |
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|---|---|---|---|---|
| US7323955B2 (en) * | 2005-06-06 | 2008-01-29 | The United States Of America As Represented By The Secretary Of The Navy | Narrow-band absorptive bandstop filter with multiple signal paths |
| JP2010136045A (en) * | 2008-12-04 | 2010-06-17 | Nippon Dengyo Kosaku Co Ltd | Power distributor/synthesizer |
| CN106935948A (en) * | 2017-02-10 | 2017-07-07 | 深圳大学 | A kind of work(filter-divider |
| CN109326855B (en) * | 2018-08-31 | 2020-06-12 | 南京师范大学 | Novel broadband four-power division filter |
| CN111416182B (en) * | 2020-03-19 | 2021-07-30 | 南京智能高端装备产业研究院有限公司 | High-selectivity three-passband power division filter |
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| CN102956948A (en) * | 2011-08-29 | 2013-03-06 | 黄森 | Novel ultra wide band Wilkinson power divider |
| 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 |
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