CN104466335B - A kind of electric adjusting power distributor with filter function - Google Patents
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- CN104466335B CN104466335B CN201410714749.2A CN201410714749A CN104466335B CN 104466335 B CN104466335 B CN 104466335B CN 201410714749 A CN201410714749 A CN 201410714749A CN 104466335 B CN104466335 B CN 104466335B
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Abstract
The present invention proposes a kind of electric adjusting power distributor with filter function, and its whole circuit structure is symmetrical, and it is 1 to realize power-division ratios：1；Two pairs of quarter-wave resonance devices for intercoupling form two filter networks, realize the characteristic of bandpass filtering；Resistance realizes the matching of 3 ports of circuit and the isolation of two output ports；The varactor of loading, the electrical length of resonator and feed line is adjusted using the on-load voltage for changing di-cap, realizes regulable center frequency；Additionally, loading coupling using source to introduce three transmission zeros so that the present invention not only has selectivity very high, and stopband inhibition is also fine.
Description
Technical field
The present invention relates to a kind of electric adjusting power distributor with filter function, radio-frequency front-end electricity is more particularly to can be applied to
The electricity for being integrated with band-pass filtering function on road adjusts equal power.
Background technology
, it is necessary to reduce equipment volume in mobile communication, satellite communication, wireless sensing net node and wearable wireless device
Or more functional modules are accommodated in the confined space, therefore miniaturization is the inexorable trend of development.Due to the body of radio-frequency front-end
Product occupies a very big part in wireless device, and development further investigation is minimized to it, with important theory significance and should
With value.
Past is to the Miniaturization Research of radio-frequency devices based on the performance boost of single component and miniaturization.By near several
The research and probe in year, the degree that current device volume reduces has been difficult to continue to improve, into bottleneck.To overcome this problem,
Multiple devices are integrated into a device by the way of many device collaborative designs, make a device that there are various functions, so that
Reduce number of devices and realize miniaturization.
Power divider has the function of distribution/composite signal, will be used in many aerial arrays and balancing circuitry,
It is the microwave circuit on basis.It is also wireless communication system and bandwidth-limited circuit can isolate the function of required frequency band
The indispensable component of middle another kind.Both elements are often coexisted in system, therefore suffer from the extensive concern of scholars.
Wave filter and power divider Integration Design aspect, integrating mainly has following methods：1）Filter circuit and work(point electricity
Road fusion makes it have two kinds of functions；2）Replace the quarter-wave transmission line in power divider with filter circuit.It is set
Meter circuit has filtered power distributor, filter couplers and filtering mixing ring etc., not only obtains good electrical properties, and volume
It is small.
Although domestic and foreign scholars start to pay attention to this direction and done some explorations, the current direction is only at starting
In the stage, face the challenge.And in terms of adjustable filter circuit, Normal practice is to change the non-adjustable component in many pass-bands systems into
Adjustable component, existing many achievements in research, but, the open source literature of the adjustable power distributor with filter function also compares
It is few.In document《S. Kim, and J. Jeong, “Reconfigurable 1:3 power divider using
coupled lines,”Electron. Lett., vol. 45, no. 22, pp. 1141–1143, Oct. 2009. 》、
《H. -S. Tae, K. -S. Oh, H. -L. Lee, W. -I. Son, and J. -W. Yu,
“Reconfigurable 1× 4 power divider with switched impedance matching
circuits,” IEEE Microw. Wireless. Compon. Lett., vol. 22, no. 2, pp. 64–66,
Feb. 2012. 》With《E. Lourandakis, M. Schmidt, S. Seitz, and R. Weigel, “Reduced
size frequency agile microwave circuits using ferroelectric thin-film
varactors,” IEEE Trans. Microw. Theory Tech., vol. 56, no. 12, pp. 3093–3099,
June. 2008.》In, using switch and varactor come the equiva lent impedance of controlling transmission line, to obtain different work(point ratio, real
Show the output port number of adjustable switch, frequency-adjustable is realized using varactor, adjustable component only has power dividing function.
According to investigation, there is not the open report in terms of the adjustable power distributor with filter function also at present, therefore, the present invention proposes one
Plant the electricity tune equal power for being integrated with band-pass filtering function.
The content of the invention
It is an object of the invention to overcome deficiencies of the prior art, it is proposed that one kind is integrated with bandpass filtering work(
The adjustable equal power of energy.In the present invention, whole circuit structure is symmetrical, and it is 1 to realize power-division ratios：1；Two pairs of phases
The quarter-wave resonance device of mutual coupling forms two filter networks, realizes the characteristic of bandpass filtering；Resistance is realized
The matching and the isolation of two output ports of 3 ports of circuit；The varactor of loading, using adding for change di-cap
Carry voltage to adjust the electrical length of resonator and feed line, realize regulable center frequency；Additionally, loading coupling using source to draw
Enter three transmission zeros so that the present invention not only has selectivity very high, stopband inhibition is also fine.
The purpose of the present invention is realized at least through one of following technical scheme.
A kind of electric adjusting power distributor with filter function, including upper-layer micro-strip structure, isolation resistance, loading capacitance,
Loading varactor, intermediate medium substrate and underlying metal floor, upper-layer micro-strip structure are attached to the upper of intermediate medium substrate
Surface, intermediate medium base lower surface is underlying metal floor；It is characterized in that：The upper-layer micro-strip structure includes four resonance
Device, three feed lines and three ports, and it is arranged into two bandwidth-limited circuits symmetrical above and below；Bandpass filtering above
Circuit is by the top half and the second feed line of the first feed line in three feed lines and four described resonators
First resonator and the second resonator are constituted；The top half of wherein the first feed line is the first microstrip line, being sequentially connected
The microstrip line that two microstrip lines, the 3rd microstrip line and the 4th microstrip line are constituted；Second feed line be sequentially connected the 5th microstrip line,
The microstrip line that 6th microstrip line, the 7th microstrip line, the 8th microstrip line and the 9th microstrip line are constituted；First resonator is included and connected successively
The tenth microstrip line, the 11st microstrip line, the 12nd microstrip line and the 13rd microstrip line for connecing；Second resonator is included and is sequentially connected
The 14th microstrip line, the 15th microstrip line, the 16th microstrip line and the 17th microstrip line；First resonator and the second resonator
Share a ground short circuit end；Input port in three ports is located at the middle part of the first feed line, the first output
Port is drawn from the end of the 9th microstrip line, and the second output port is exported in underlying bandwidth-limited circuit and with first
Port is in symmetrical above and below.
Further optimize, four resonators are arranged into the structure in specular and are trapped among the first feed line and the second feedback
The outside of electric wire；First feed line and the second feed line bend rectangular and two ends and are not directly connected, the first feed line and
The upper part of two feed lines is in specular with lower part；Described the first microstrip line and the 11st microstrip line is parallel to each other and leans on
Near to form coupling, the second microstrip line and the 12nd microstrip line are parallel to each other and couple near being formed, the 3rd microstrip line and the 13rd micro-
Band line is parallel to each other near coupling is formed, and the 6th microstrip line and the 14th microstrip line are parallel to each other to be close to be formed and couple, and the 7th is micro-
Band line and the 15th microstrip line are parallel to each other near coupling is formed, and the 8th microstrip line and the 16th microstrip line are parallel to each other near shape
Into coupling, the 9th microstrip line and the 17th microstrip line are parallel to each other near formation coupling, the 13rd microstrip line and the 14th micro-strip
Line is parallel to each other and coupled near formation.
Further optimize, isolation resistance is added in two open ends of the first feed line, enhance two outputs of circuit
The isolation effect of port.
Further optimize, the loading capacitance and loading varactor have eight, a loading capacitance and
Eight groups of circuits that individual loading varactor is connected into after one group, and series connection have one end to be grounded, eight after series connection group circuit
The other end is correspondingly carried on eight open ends that four resonators and the first feed line, the second feed line are formed, i.e., described
Eight groups of circuit arrangements symmetrical above and below after series connection, four groups of top half respectively with the tenth microstrip line, the 4th microstrip line, the 5th is micro-
Band line and the 9th microstrip line are connected；The two ends for loading varactor add voltage source, and the magnitude of voltage for changing voltage source can just change
Become the capacitance loading capacitance of loading varactor and the structure of loading varactor composition.
Further optimize, the length of four described resonators is the working frequency correspondence of described bandwidth-limited circuit
Wavelength a quarter.
Further optimize, three transmission zeros in the electric adjusting power distributor transmission characteristic are distinguished by the first feed line
Generation is coupled with the second feed line and the formation source load close to each other of the 3rd feed line.
Further optimize, from input port（I/P）To the first output port（O/P1）With the second output port（O/P2）
Path it is identical, realize 1：1 power-division ratios.
Further, frequency divider input and output impedance is 50 ohm, by the value and each microstrip line that adjust isolation resistance
Between coupling realize matching.
Compared with prior art, the invention has the advantages that and technique effect：
（1）Band-pass filtering function is integrated with traditional power divider, power distribution and filtering can be simultaneously realized
Effect, has smaller size and smaller loss relative to the filter circuit and power divider of cascade, is more beneficial for radio frequency
The integra-tion application of front-end circuit.
（2）The present invention is loaded with varactor on the power divider with filter function, realizes working frequency
It is adjustable.
Brief description of the drawings
Fig. 1 is a kind of structure chart of the electric adjusting power distributor with filter function in example.
Fig. 2 is a kind of size marking figure of the electric adjusting power distributor with filter function in example.
Fig. 3 is S11Parameter and S23The measured result of parameter.
Fig. 4 is S22Parameter and S33The measured result of parameter.
Fig. 5 is S21Parameter and S31The measured result of parameter.
Specific embodiment
With reference to embodiment and accompanying drawing, implementation of the invention is described in further detail, but implementation of the invention
Mode not limited to this.
As shown in figure 1, a kind of electric adjusting power distributor with filter function, including upper-layer micro-strip structure, isolation resistance,
Loading capacitance, loading varactor, intermediate medium substrate and underlying metal floor, upper-layer micro-strip structure are attached to intermediate medium
The upper surface of substrate, intermediate medium base lower surface is underlying metal floor；Upper-layer micro-strip structure includes four resonators, three
Feed line and three ports, are arranged into two bandwidth-limited circuits symmetrical above and below；Bandwidth-limited circuit above is by institute
State in the top half 1 of the first feed line in three feed lines and the second feed line 4 and four described resonators first humorous
The device 2 that shakes is constituted with the second resonator 3.
Such as Fig. 1, the top half 1 of the first feed line is micro- the first microstrip line 5 for being sequentially connected, the second microstrip line the 6, the 3rd
With the microstrip line that line 7 and the 4th microstrip line 8 are constituted；Second feed line 4 is the 5th microstrip line 9, the 6th microstrip line that are sequentially connected
10th, the microstrip line that the 7th microstrip line 11, the 8th microstrip line 12 and the 9th microstrip line 13 are constituted；First resonator 2 is included and connected successively
The tenth microstrip line 14, the 11st microstrip line 15, the 12nd microstrip line 16 and the 13rd microstrip line 17 for connecing；Second resonator 3 is wrapped
Containing the 14th microstrip line 18, the 15th microstrip line 19, the 16th microstrip line 20 and the 17th microstrip line 21 that are sequentially connected；First
The resonator 3 of resonator 2 and second shares a ground short circuit end 18；Input port I/P in three ports is located at first
The middle part of feed line, the first output port O/P1 draws from the end of the 9th microstrip line 13, and the second output port O/P2 exists
In symmetrical above and below in underlying bandwidth-limited circuit and with the first output port O/P1；Four resonators are bent into
Two class " several " fonts of lower specular.The bending of first feed line is rectangular, the first described microstrip line 5 and the 11st micro-strip
Line 15 is parallel to each other near coupling is formed, and the second microstrip line 6 and the 12nd microstrip line 16 are parallel to each other and coupled near formation, and the 3rd
The microstrip line 17 of microstrip line 7 and the 13rd is parallel to each other near coupling is formed, and the 6th microstrip line 10 and the 14th microstrip line 18 are mutual
Coupled parallel and near to being formed, the 7th microstrip line 11 and the 15th microstrip line 19 are parallel to each other and coupled near formation, the 8th microstrip line
12 and the 16th microstrip line 20 is parallel to each other near coupling is formed, and the 9th microstrip line 13 and the 17th microstrip line 21 are parallel to each other and lean on
Near to form coupling, the 13rd microstrip line 17 and the 14th microstrip line 18 are parallel to each other and coupled near formation；Isolation resistance 26 is added in
The two ends of the first feed line, enhance two isolation effects of output port of circuit；Loading capacitance 22 and loading transfiguration two pole
Pipe 24 is grounded 25 after connecting, and voltage source 23 is added at the two ends of loading varactor 24, changes the magnitude of voltage of voltage source 23 just
The capacitance of loading varactor can be changed；A kind of electric adjusting power distributor of described filter function has eight loading electricity
Hold the structure with loading varactor composition, arrangement symmetrical above and below, four of top half respectively with the tenth microstrip line 14, the
Four microstrip lines 8, the 5th microstrip line 9 is connected with the 9th microstrip line 13.
The length of four described resonators is four points of the corresponding wavelength of working frequency of described bandwidth-limited circuit
One of；First feed line is coupled with the second feed line and the formation source load close to each other of the 3rd feed line respectively, described one
Three transmission zeros in the transmission characteristic of the electric adjusting power distributor for planting filter function；Input and output impedance is 50 ohm,
By adjusting isolation resistance（26）Value and each microstrip line between coupling.
Embodiment
As shown in Fig. 2 as example, the design of the electric adjusting power distributor with filter function, the choosing of physical circuit size
Select as follows：W 1=2.33mm,W 2=0.5mm,W 3=1.4mm,W 4=0.5mm,W 5=1.3mm,L 1=2mm,L 2=9.7mm,L 3=12.9mm,L 4=10.1mm,L 5=3mm,L 6=8.5mm,L 7=1.2mm,L 8=1.2mm,L 9=6.7mm,L 10=7mm,L 11=9.4mm,G 1=0.2mm,G 2=0.3mm, G 3=0.15mm,G 4=1.2mm, G 5=0.3mm, D=0.8mm, R=150Ω,C 1=2pF；Select to become in the design
That hold diode is the 1sv277 of Toshiba.Overall dimensions are 34mm × 23.6mm.
It is illustrated in figure 3 S11And S23Measured result, it is known that, return loss be more than 20dB, isolation be better than 18dB.
It is illustrated in figure 4 S22And S33Measured result, better than 15dB under any circumstance realizes matching well.
It is illustrated in figure 5 S21And S31Measured result, under any circumstance, Out-of-band rejection is better than 28dB, suppression level
It is high；Produce transmission zero with the synchronous change of source load coupling near pass-band, realize high selectivity；Additionally, circuit is at center
Frequency（0.83GHz-1.13GHz）In the range of it is adjustable, adjustable extent is 30.6%；Meanwhile, after frequency shift, the items of circuit
Performance indications keep good, have been well demonstrated that the correctness of design theory of the present invention.
To sum up, the invention provides a kind of electric adjusting power distributor with filter function, with small volume, filter effect
Good, the excellent properties of regulable center frequency are suitably applied in the radio-frequency front-end of wireless communication system.
Embodiments described above is an embodiment taught in the present invention, is not intended to limit the invention.Base
In embodiments of the invention, those of ordinary skill in the art on the premise of creative work is not made, based on institute of the present invention
Any modification made, equivalent improves obtained other embodiment, belongs to the protection domain of the embodiment of the present invention.
Claims (8)
1. a kind of electric adjusting power distributor with filter function, including upper-layer micro-strip structure, isolation resistance（26）, loading capacitance
（22）, loading varactor（24）, intermediate medium substrate and underlying metal floor, upper-layer micro-strip structure is attached to intermediate medium
The upper surface of substrate, intermediate medium base lower surface is underlying metal floor；It is characterized in that：The upper-layer micro-strip structure includes
Four resonators, three feed lines and three ports, and it is arranged into two bandwidth-limited circuits symmetrical above and below；Above
Bandwidth-limited circuit by the first feed line in three feed lines top half（1）With the second feed line（4）And it is described
Four resonators in the first resonator（2）With the second resonator（3）Composition；The wherein top half of the first feed line（1）For
The first microstrip line being sequentially connected（5）, the second microstrip line（6）, the 3rd microstrip line（7）With the 4th microstrip line（8）The micro-strip of composition
Line；Second feed line（4）It is the 5th microstrip line being sequentially connected（9）, the 6th microstrip line（10）, the 7th microstrip line（11）, the 8th
Microstrip line（12）With the 9th microstrip line（13）The microstrip line of composition；First resonator（2）Comprising the tenth microstrip line being sequentially connected
（14）, the 11st microstrip line（15）, the 12nd microstrip line（16）With the 13rd microstrip line（17）；Second resonator（3）Comprising according to
14th microstrip line of secondary connection（18）, the 15th microstrip line（19）, the 16th microstrip line（20）With the 17th microstrip line（21）；
First resonator（2）With the second resonator（3）Share a ground short circuit end；Input port in three ports（I/P）
Positioned at the middle part of the first feed line, the first output port（O/P1）From the 9th microstrip line（13）End draw, second is defeated
Exit port（O/P2）In underlying bandwidth-limited circuit and with the first output port（O/P1）In symmetrical above and below.
2. a kind of electric adjusting power distributor with filter function according to claim 1, it is characterised in that four resonance
Device is arranged into the structure in specular and is trapped among the outside of the first feed line and the second feed line；First feed line and the second feedback
Electric wire bends rectangular and two ends and is not directly connected, and the upper part of the first feed line and the second feed line is in mirror with lower part
As symmetrical；The first described microstrip line（5）With the 11st microstrip line（15）It is parallel to each other and coupled near formation, the second microstrip line
（6）With the 12nd microstrip line（16）It is parallel to each other and coupled near formation, the 3rd microstrip line（7）With the 13rd microstrip line（17）Mutually
Coupled parallel and near to being formed, the 6th microstrip line（10）With the 14th microstrip line（18）It is parallel to each other near coupling is formed, the 7th is micro-
Band line（11）With the 15th microstrip line（19）It is parallel to each other and coupled near formation, the 8th microstrip line（12）With the 16th microstrip line
（20）It is parallel to each other and coupled near formation, the 9th microstrip line（13）With the 17th microstrip line（21）It is parallel to each other to be close to and forms coupling
Close, the 13rd microstrip line（17）With the 14th microstrip line（18）It is parallel to each other and coupled near formation.
3. a kind of electric adjusting power distributor with filter function according to claim 1, it is characterised in that isolation resistance
（26）It is added in two open ends of the first feed line.
4. a kind of electric adjusting power distributor with filter function according to claim 1, it is characterised in that the loading
Electric capacity and loading varactor have eight, a loading capacitance（22）With a loading varactor（24）It is connected into
Eight groups of circuits after one group, and series connection have one end to be grounded（25）, the other end of eight groups of circuits after series connection is correspondingly carried in
On eight open ends that four resonators and the first feed line, the second feed line are formed, i.e., on eight groups of circuits after described series connection
Lower symmetry arrangement, four groups of top half respectively with the tenth microstrip line（14）, the 4th microstrip line（8）, the 5th microstrip line（9）With
Nine microstrip lines（13）It is connected；Loading varactor（24）Two ends add voltage source（23）, change voltage source（23）Voltage
Value can just change the capacitance loading capacitance of loading varactor and the structure of loading varactor composition.
5. a kind of electric adjusting power distributor with filter function according to claim 1, it is characterised in that described four
The length of individual resonator is a quarter of the corresponding wavelength of working frequency of described bandwidth-limited circuit.
6. a kind of electric adjusting power distributor with filter function according to claim 1, it is characterised in that the electric Power Regulation
Three transmission zeros in rate distributor transmission characteristic are mutual with the second feed line and the 3rd feed line respectively by the first feed line
Produced near source load coupling is formed.
7. a kind of electric adjusting power distributor with filter function according to claim 2, it is characterised in that from input
Mouthful（I/P）To the first output port（O/P1）With the second output port（O/P2）Path it is identical, realize 1：1 power
Distribution ratio.
8. a kind of electric adjusting power distributor with filter function according to any one of claim 1 ~ 7, it is characterised in that
Frequency divider input and output impedance is 50 ohm, by adjusting isolation resistance（26）Value and each microstrip line between coupling realize
Matching.
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| CN105098303A (en) * | 2015-08-25 | 2015-11-25 | 华南理工大学 | Power divider with double-band filter function |
| CN105375093B (en) * | 2015-10-30 | 2018-07-06 | 成都九洲迪飞科技有限责任公司 | The adjustable microstrip power divider of working frequency |
| CN106602200B (en) * | 2016-12-02 | 2018-07-31 | 南京理工大学 | A kind of micro-strip work(filter-divider |
| CN107579327B (en) * | 2017-07-31 | 2020-02-07 | 西安电子科技大学 | Reconfigurable power divider with dual-adjustable frequency and power division ratio |
| CN109888441B (en) * | 2019-03-05 | 2021-02-26 | 南通大学 | Bandwidth-adjustable balanced filtering power divider |
| CN110247143B (en) * | 2019-06-19 | 2023-12-19 | 南京信息工程大学 | Microstrip band-pass filter with switchable and tunable functions |
| CN110289830B (en) * | 2019-07-30 | 2023-05-09 | 成都频岢微电子有限公司 | Branch filter network |
| CN114335952B (en) * | 2021-12-29 | 2023-03-24 | 重庆两江卫星移动通信有限公司 | Filtering power divider with reconfigurable phase difference and distribution ratio and antenna system |
| CN115473019B (en) * | 2022-08-09 | 2023-09-26 | 华南理工大学 | Filter power divider with reconfigurable arbitrary channel number and radio frequency front end |
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