CN205723953U - The microstrip line butler matrix with band-pass filtering property based on uniform impedance resonator - Google Patents
The microstrip line butler matrix with band-pass filtering property based on uniform impedance resonator Download PDFInfo
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- CN205723953U CN205723953U CN201620524837.0U CN201620524837U CN205723953U CN 205723953 U CN205723953 U CN 205723953U CN 201620524837 U CN201620524837 U CN 201620524837U CN 205723953 U CN205723953 U CN 205723953U
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Abstract
The utility model discloses a kind of microstrip line butler matrix with band-pass filtering property based on uniform impedance resonator, it includes 4 half-wavelength uniform impedance resonators, 2 input feeder line heads, 2 outfan feeder line heads, 4 root port feeder lines.There are electric coupling or magnetic coupling between each resonator and two other resonator, realize phase-shift characterisitc by the combination of electric coupling and magnetic coupling path.This utility model uses uniform impedance resonator element to replace three-dB coupler, simple in construction, and achieves band-pass filtering property；By electric coupling and the incompatible generation phase shift of magnetic-coupled group of paths, not only eliminating the use of phase shifter, also ensure that preferable isolation, circuit size is greatly reduced.Owing to butler matrix is microstrip structure, lightweight, low cost, applicable industrial mass manufacture, so butler matrix possesses simple in construction, designs advantage easy, cheap for manufacturing cost.
Description
Technical field
This utility model relates to the technical field of microstrip line form butler matrix, particularly to one based on uniform impedance
The microstrip line butler matrix with band-pass filtering property of resonator.
Background technology
Due to the high speed development of radio communication in recent years, either universal, the Internet of Things of 3G technology is burning hot or 4G
Arrive, all indicate that wireless technology will welcome a flourish peak period again.On the other hand, swift and violent along with electronic information
Development, the problems such as people are more and more higher for the requirement of communication quality, the interference of multipath fading and interchannel the most more seem heavy
Want.The major technique solving these problems at present is to utilize beam switchover smart antenna, and butler matrix is as composition wave beam
The pith of switching smart antenna, it is possible to realize beam-forming network, therefore also becomes one of study hotspot in recent years.
Meanwhile, in actual applications, in order to suppress to transmit undesire frequency and the Intermodulation Interference of amplifier of signal, cascade is generally also needed to
One band filter, this will cause the increasing of circuit size.If able to by butler matrix and band-pass filtering property collection
Becoming in one structure, must be greatly reduced the size of circuit, this also complies with the trend of device miniaturization.
The more commonly used structure the most eaily of butler matrix is to intersect between input port and output port at present
Cascade three-dB coupler and the phase shifter of special angle, make the performance of butler matrix can reach intended index.
2013, O.M.Haraz et al. existed " IEEE International Conference on Ultra-
Wideband " on deliver entitled " Two-Layer Butterfly-Shaped Microstrip 4 × 4Butler Matrix
For Ultra-Wideband Beam-Forming Applications ", use double-layer microstrip-line structure, it is achieved that bonder
Cross interconnected with the phase shifter, forms the butler matrix of 4 × 4.This structure is as shown in Figure 1.
2013, Tong-Hong Lin et al. existed " IEEE TRANSACTIONS ON MICROWAVE THEORY AND
TECHNIQUES " on deliver entitled " Bandwidth Enhancement of 4 × 4ButlerMatrixUsing
Broadband Forward-Wave DirectionalCoupler and Phase Difference Compensation ",
Use double panel structure, be utilized respectively forward-wave direct-coupling and phase difference compensation technique realizes bonder and phase shifter, shape
Become the butler matrix of 4 × 4.This structure is as shown in Figure 2.
2015, M.J.Lancaster et al. existed " IEEE TRANSACTIONS ON MICROWAVE THEORY AND
TECHNIQUES " on deliver entitled " Advanced Butler Matrices with Integrated Bandpass
Filter Functions ", use cavity resonator to realize band-pass filtering property, utilize the coupling between cavity resonator real
Existing phase shift, forms the butler matrix of 2 × 2 band filtering characteristics.This structure is as shown in Figure 3.
Utility model content
The purpose of this utility model is that the shortcoming overcoming prior art is with not enough, it is provided that a kind of based on uniform impedance resonance
The microstrip line butler matrix with band-pass filtering property of device, this butler matrix uses at input port and outfan
Cascade the structure of resonator element between Kou, and by the electric coupling between resonator element and magnetic-coupled combination, realize
Phase of output signal difference is 0 ° or 180 °, thus eliminates phase shifter structure, reduces the size of circuit, the resonance simultaneously cascaded
Device unit is capable of good band-pass filtering property.
The purpose of this utility model is achieved through the following technical solutions:
A kind of microstrip line butler matrix with band-pass filtering property based on uniform impedance resonator, with printed circuit
The mode of plate is produced on medium substrate 1,
Make respectively on the same face of described medium substrate and have the first input end feeder line head for inputting electromagnetic wave signal
P1 and the second input feeder line head P2, for exporting the first outfan feeder line head P3 and the second outfan feeder line of electromagnetic wave signal
Head P4, the first port feedline 2 being connected with described first input end feeder line head P1, be connected with described second input feeder line head P2
The second port feedline 5, the 3rd port feedline 3 being connected with described first outfan feeder line head P3 and described second outfan
The 4th port feedline 4, two groups that feeder line head P4 is connected the first resonator 9 of be arrangeding in parallel of left and right respectively and the 4th resonator 8 with
And the 3rd resonator 6 and the second resonator 7；
Described first resonator 9 and described 4th resonator 8 and described 3rd resonator 6 and described second resonator 7
It is arranged in parallel up and down；Described first port feedline 2 and described 4th port feedline 4 lay respectively at described first resonator 9
With the outside of described 4th resonator 8, and described first port feedline 2 is parallel with described second port feedline about 4 sets
Put；Described 3rd port feedline 3 and described second port feedline 5 lay respectively at described 3rd resonator 6 and described second resonance
The outside of device 7, and described 3rd port feedline 3 and described second port feedline about 5 be arranged in parallel.
Further, described first resonator 9, described 4th resonator 8, described second resonator 7, described 3rd resonance
Device 6 is half-wavelength uniform impedance resonator.
Further, described first resonator 9 and the c-type resonator that described 3rd resonator 6 is setting symmetrical above and below, its
In, the opening direction of described first resonator 9 is lower right, and the opening direction of described 3rd resonator 6 is upper right side.
Further, described 4th resonator 8 and the U-shaped resonator that described second resonator 7 is setting symmetrical above and below, its
In, the opening direction of described 4th resonator 8 is top, and the opening direction of described second resonator 7 is lower section.
Further, described first resonator 9 and described 3rd resonator 6, described first resonator 9 are 4th humorous with described
Shake and there is electric coupling between device 8, described 3rd resonator 6 and described second resonator 7, respectively by regulate above-mentioned resonator it
Between first coupling gap the 10, second coupling gap the 11, the 3rd coupling gap 12 size control electric coupling size.
Further, between described second resonator 7 and described 4th resonator 8, there is magnetic coupling, above-mentioned by regulation
The size of the 4th coupling gap 13 between resonator controls magnetic-coupled size.
Further, when described first input end feeder line head P1 inputs electromagnetic wave signal, described first outfan feeder line head
The signal phase of P3 and described second outfan feeder line head P4 output is equal.
Further, when described second input feeder line head P2 inputs electromagnetic wave signal, described first outfan feeder line head
The signal phase of P3 and described second outfan feeder line head P4 output differs 180 °.
Further, described first input end feeder line head P1 is vertical with one end of described first port feedline 2 to be connected, described
Second input feeder line head P2 is vertical with one end of described second port feedline 5 to be connected, described first outfan feeder line head P3 with
One end of described 3rd port feedline 3 vertically connects, described second outfan feeder line head P4 and the one of described 4th port feedline 4
End is vertical to be connected.
This utility model has such advantages as relative to prior art and effect:
1, use uniform impedance resonator element to replace three-dB coupler, simple in construction, and it is special to achieve bandpass filtering
Property.
2, by electric coupling and the incompatible generation phase shift of magnetic-coupled group of paths, not only eliminate the use of phase shifter, also protect
Having demonstrate,proved preferable isolation, circuit size is greatly reduced.
3, it is microstrip structure due to butler matrix, lightweight, low cost, is suitable for industrial mass manufacture, so Butler
Matrix possesses simple in construction, designs advantage easy, cheap for manufacturing cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of butler matrix disclosed in prior art 1；
Fig. 2 is the structural representation of a kind of butler matrix disclosed in prior art 2；
Fig. 3 is the structural representation of a kind of butler matrix disclosed in prior art 3；
Fig. 4 is the microstrip line Bart with band-pass filtering property based on uniform impedance resonator that the utility model proposes
Strangle the structural representation of matrix；
Fig. 5 is the microstrip line Bart with band-pass filtering property based on uniform impedance resonator that the utility model proposes
Strangle the physical dimension schematic diagram of matrix；
Fig. 6 (a) is the scattering parameter simulation result figure of butler matrix when P1 port input signal；
Fig. 6 (b) is the scattering parameter simulation result figure of butler matrix when P2 port input signal；
Fig. 7 is the microstrip line Bart with band-pass filtering property based on uniform impedance resonator that the utility model proposes
The phase of output signal differential of the P3 port and P4 port of strangling matrix is intended to；
Fig. 8 is simulation result and the preferable phase of output signal difference of the phase of output signal difference that the utility model proposes
Error schematic diagram.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, develop simultaneously enforcement referring to the drawings
This utility model is further described by example.Should be appreciated that specific embodiment described herein is only in order to explain this reality
With novel, it is not used to limit this utility model.
Embodiment
The present embodiment discloses a kind of microstrip line Butler square with band-pass filtering property based on uniform impedance resonator
Battle array as it is shown in figure 1, this microstrip line butler matrix is produced on double-sided copper-clad micro-strip plate 1 in the manner of a printed circuit board, micro-strip
The additionally one side of plate is to cover copper earth plate.In the structure chart of the butler matrix in this utility model.
Make respectively on the same face of described medium substrate and have the first input end feeder line head for inputting electromagnetic wave signal
P1 and the second input feeder line head P2, for exporting the first outfan feeder line head P3 of electromagnetic wave signal and the feedback of the second outfan
The end of a thread P4, the first port feedline 2 being connected with described first input end feeder line head P1 and described second input feeder line head P2 phase
The second port feedline 5 even, the 3rd port feedline 3 being connected with described first outfan feeder line head P3 and described second output
The 4th port feedline 4, two groups the first resonator 9 and the 4th resonator 8 that left and right be arranged in parallel respectively that end feeder line head P4 is connected
And the 3rd resonator 6 and the second resonator 7；
Described first resonator 9 and described 4th resonator 8 and described 3rd resonator 6 and described second resonator 7
It is arranged in parallel up and down；Described first port feedline 2 and described 4th port feedline 4 lay respectively at described first resonator 9 and institute
State the outside of the 4th resonator 8, and described first port feedline 2 and described second port feedline about 4 be arranged in parallel；Described
3rd port feedline 3 and described second port feedline 5 lay respectively at outside described 3rd resonator 6 and described second resonator 7
Side, and described 3rd port feedline 3 and described second port feedline about 5 be arranged in parallel.
Wherein, described first resonator 9, described 4th resonator 8, described second resonator 7, described 3rd resonator 6
It is half-wavelength uniform impedance resonator.
Wherein, described first resonator 9 and the c-type resonator that described 3rd resonator 6 is setting symmetrical above and below, wherein,
The opening direction of described first resonator 9 is lower right, and the opening direction of described 3rd resonator 6 is upper right side.
Meanwhile, described 4th resonator 8 and the U-shaped resonator that described second resonator 7 is setting symmetrical above and below, wherein,
The opening direction of described 4th resonator 8 is top, and the opening direction of described second resonator 7 is lower section.
The external sort factor of band filter can be by changing the coupling between the length of feeder line and feeder line resonator
Regulation.Described first resonator 9 and described 3rd resonator 6, described first resonator 9 and described 4th resonator 8, described the
Electric coupling is there is, respectively by regulating the first coupling between above-mentioned resonator between three resonators 6 and described second resonator 7
The size of gap the 10, second coupling gap the 11, the 3rd coupling gap 12 controls the size of electric coupling.
Magnetic coupling is there is, by regulating between above-mentioned resonator between described second resonator 7 and described 4th resonator 8
The 4th coupling gap 13 size control magnetic-coupled size.
When described first input end feeder line head P1 inputs electromagnetic wave signal, described first outfan feeder line head P3 and described the
The signal phase of two outfan feeder line head P4 outputs is equal.
When described second input feeder line head P2 inputs electromagnetic wave signal, described first outfan feeder line head P3 and described the
The signal phase of two outfan feeder line head P4 outputs differs 180 °.
Described first input end feeder line head P1 is vertical with one end of described first port feedline 2 to be connected, described second input
Feeder line head P2 is vertical with one end of described second port feedline 5 is connected for end, described first outfan feeder line head P3 and the described 3rd
One end of port feedline 3 vertically connects, and described second outfan feeder line head P4 is vertical with one end of described 4th port feedline 4 to be connected
Connect.
From the signal of first input end feeder line head P1 port input, it is coupled to the first resonator by the first port feedline 2
9, then it is coupled to the 4th resonator 8 by the electric coupling between the first resonator 9 and the 4th resonator 8, and makes signal produce
The phase place of 90 ° is advanced, and then the signal of the 4th resonator 8 is coupled to the second outfan feeder line head P4 by the 4th port feedline 4,
Therefore the second outfan feeder line head P4 can receive the signal of advanced 90 ° of phase place；Meanwhile, the signal in the first resonator 9, also can
It is coupled to the 3rd resonator 6 by the electric coupling between the first resonator 9 and the 3rd resonator 6, and makes the phase of signal generation 90 °
Position is advanced, and then the signal of the 3rd resonator 6 is coupled to the first outfan feeder line head P3 by the 3rd port feedline 3, and therefore the
One outfan feeder line head P3 can receive the signal of advanced 90 ° of phase place；So the first outfan feeder line head P3 and the second outfan
The port of feeder line head P4 can obtain the signal of the most advanced 90 ° of phase place, but their phase place or equal.4th resonance simultaneously
In device 8 and the 3rd resonator 6, signal is respectively by the magnetic coupling between the 4th resonator 8 and the second resonator 7 and the 3rd resonance
The second resonator 7 is coupled in electric coupling between device 6 and the second resonator 7, and produces the delayed phase of 90 ° and 90 ° respectively
Phase place is advanced, then have in the second resonator 7 two equal in magnitude, phase contrast is the signal of 180 °, cancels out each other, therefore second
Input feeder line head P2 port output signal is the least, therefore has higher isolation between two input ports.
From the signal of the second input feeder line head P2 port input, it is coupled to the second resonator by the second port feedline 5
7, then it is coupled to the 4th resonator 8 by the magnetic coupling between the second resonator 7 and the 4th resonator 8, and makes signal produce
The delayed phase of 90 °, then the signal of the 4th resonator 8 is coupled to the second outfan feeder line head P4 by the 4th port feedline 4,
Therefore the second outfan feeder line head P4 can receive the signal of delayed phase 90 °；Meanwhile, the signal in the second resonator 7, also can
It is coupled to the 3rd resonator 6 by the electric coupling between the second resonator 7 and the 3rd resonator 6, and makes the phase of signal generation 90 °
Position is advanced, and then the signal of the 3rd resonator 6 is coupled to the first outfan feeder line head P3 by the 3rd port feedline 3, and therefore the
One outfan feeder line head P3 can receive the signal of advanced 90 ° of phase place；So the first outfan feeder line head P3 and the second outfan
The port of feeder line head P4 can respectively obtain the signal of delayed phase 90 ° and advanced 90 ° of phase place, therefore their phase 180 °.
Simultaneously in the 4th resonator 8 and the 3rd resonator 6 signal respectively by the thermocouple between the 4th resonator 8 and the first resonator 9
The first resonator 9 is coupled in electric coupling between conjunction and the 3rd resonator 6 and the first resonator 9, and all produces the phase place of 90 °
In advance, therefore the first resonator 9 has two equal in magnitude, phase contrast is 180 °, cancels out each other, therefore first input end feedback
The end of a thread P1 port output signal is the least, has higher isolation.These four ports are the coupling impedance of 50 ohm.
Fig. 5 is the Butler matrix structure scale diagrams that the utility model proposes.This structure chart is symmetrical.
Use three-dimensional artificial software ZELAND IE3D that butler matrix is emulated, the Bart of this utility model design
The relative dielectric constant strangling the micro-strip substrate that matrix uses is 2.55, and medium level is 0.8, the main structure parameters of wave filter
For: L1=12.85mm, L2=17.20mm, L3=5.00mm, L4=11.10mm, L5=11.57mm, L6=5.63mm, L7=
8.30mm,L8=13.95mm, W1=0.7mm, W2=1mm, W3=1mm, S1=0.20mm, S2=0.89mm, S3=1.83mm, S4
=1.58mm, S5=0.35mm.
Fig. 6 (a) and Fig. 6 (b) shows the scattering parameter of butler matrix when P1 port and P2 port input signal respectively
Simulation result, the mid frequency of its band-pass filtering property is respectively 2.4Ghz, and transverse axis represents butler matrix in this utility model
Signal frequency, the longitudinal axis represents amplitude, including insertion loss (S31、S41、S32、S42) amplitude, return loss (S11, S22) width
Degree and isolation (S21, S12) amplitude, wherein S11, S22Represent the return loss of port1 Yu port2, S respectively31Represent
The insertion loss of port1 and port3, S41Represent the insertion loss of port1 and port4, S32Represent the insertion of port2 and port3
Loss, S42Represent the insertion loss of port2 and port4.Insertion loss represents input power and another port of a signal
Relation between the output of signal, its corresponding mathematical function is: output/input power (dB)=20*log | S21
|.Return loss represents the relation between the input power of this port signal and the reflection power of signal, its corresponding mathematical function
As follows: reflection power/incident power==20*log | S11|。
In the passband of 2.4Ghz, return loss S11And S22Absolute value more than 17dB, insertion loss S31、S41、S32With
S42Absolute value be respectively less than 4dB.In terms of the frequency range of 1.8 to 3Ghz, the isolation S of butler matrix12And S21Absolute value
More than 36dB.
Fig. 7 shows that the phase of output signal of the P3 port of butler matrix and P4 port is poor, and transverse axis represents that this practicality is new
The signal frequency of butler matrix in type, the longitudinal axis represents angle.In the passband of band filter, when signal inputs from P1 port
Time, can receive, at P3 port and P4 port, two signals that phase place is of substantially equal；When signal inputs from P2 port, permissible
Two signals that phase contrast is about 180 ° are received at P3 port and P4 port.Fig. 8 shows the emulation of phase of output signal difference
The error that result is poor with preferable phase of output signal.As shown in Figure 8, in the passband of band filter, output signal
The error of phase contrast is less than 5 °.
In sum, the design of a kind of butler matrix with band-pass filtering property that the present embodiment proposes, profit
With the uniform impedance resonator structure of four 1/2nd wavelength of combination, and between each resonator and other two resonators
There is electric coupling or magnetic coupling, make output signal produce 0 ° or the phase contrast of 180 ° by the combination of coupling path.There is design
Flexibly, volume is little, low cost, and isolation is high, and filtering characteristic is good, the feature that phase of output signal mistake difference is little.
Above-described embodiment is this utility model preferably embodiment, but embodiment of the present utility model is not by above-mentioned
The restriction of embodiment, other any without departing from the change made under spirit of the present utility model and principle, modify, replace
In generation, combine, simplify, all should be the substitute mode of equivalence, within being included in protection domain of the present utility model.
Claims (9)
1. a microstrip line butler matrix with band-pass filtering property based on uniform impedance resonator, with printed circuit board (PCB)
Mode be produced on medium substrate (1), it is characterised in that:
Make respectively on the same face of described medium substrate have first input end feeder line head P1 for inputting electromagnetic wave signal and
Second input feeder line head P2, for exporting the first outfan feeder line head P3 and the second outfan feeder line head of electromagnetic wave signal
P4, the first port feedline (2) being connected with described first input end feeder line head P1, it is connected with described second input feeder line head P2
The second port feedline (5), the 3rd port feedline (3) that is connected with described first outfan feeder line head P3 second defeated with described
Go out to hold the 4th connected for feeder line head P4 port feedline (4), two groups of first resonators (9) that left and right be arranged in parallel respectively humorous with the 4th
Shake device (8) and the 3rd resonator (6) and the second resonator (7)；
Described first resonator (9) and described 4th resonator (8) and described 3rd resonator (6) and described second resonator
(7) it be arranged in parallel up and down；Described first port feedline (2) and described 4th port feedline (4) lay respectively at described first resonance
Device (9) and the outside of described 4th resonator (8), and described first port feedline (2) and described second port feedline (4) are left
The right side be arranged in parallel；Described 3rd port feedline (3) and described second port feedline (5) lay respectively at described 3rd resonator (6)
With the outside of described second resonator (7), and described 3rd port feedline (3) and described second port feedline (5) left and right flat
Row is arranged.
The microstrip line Butler square with band-pass filtering property based on uniform impedance resonator the most according to claim 1
Battle array, it is characterised in that described first resonator (9), described 4th resonator (8), described second resonator (7), the described 3rd
Resonator (6) is half-wavelength uniform impedance resonator.
The microstrip line Butler square with band-pass filtering property based on uniform impedance resonator the most according to claim 2
Battle array, it is characterised in that described first resonator (9) and described 3rd resonator (6) are the c-type resonator of setting symmetrical above and below,
Wherein, the opening direction of described first resonator (9) is lower right, and the opening direction of described 3rd resonator (6) is upper right side.
The microstrip line Butler square with band-pass filtering property based on uniform impedance resonator the most according to claim 2
Battle array, it is characterised in that described 4th resonator (8) and described second resonator (7) are the U-shaped resonator of setting symmetrical above and below,
Wherein, the opening direction of described 4th resonator (8) is top, and the opening direction of described second resonator (7) is lower section.
5. according to the arbitrary described microstrip line with band-pass filtering property based on uniform impedance resonator of Claims 1-4
Butler matrix, it is characterised in that described first resonator (9) and described 3rd resonator (6), described first resonator (9)
And described 4th resonator (8), between described 3rd resonator (6) and described second resonator (7), there is electric coupling, respectively
By regulating the first coupling gap (10) between above-mentioned resonator, the second coupling gap (11), the 3rd coupling gap (12)
Size controls the size of electric coupling.
6. according to the arbitrary described microstrip line with band-pass filtering property based on uniform impedance resonator of Claims 1-4
Butler matrix, it is characterised in that there is magnetic coupling between described second resonator (7) and described 4th resonator (8), pass through
The size regulating the 4th coupling gap (13) between above-mentioned resonator controls magnetic-coupled size.
7. according to the arbitrary described microstrip line with band-pass filtering property based on uniform impedance resonator of Claims 1-4
Butler matrix, it is characterised in that when described first input end feeder line head P1 inputs electromagnetic wave signal, described first outfan feedback
The signal phase of the end of a thread P3 and described second outfan feeder line head P4 output is equal.
8. according to the arbitrary described microstrip line with band-pass filtering property based on uniform impedance resonator of Claims 1-4
Butler matrix, it is characterised in that when described second input feeder line head P2 inputs electromagnetic wave signal, described first outfan feedback
The signal phase of the end of a thread P3 and described second outfan feeder line head P4 output differs 180 °.
The microstrip line Butler square with band-pass filtering property based on uniform impedance resonator the most according to claim 1
Battle array, it is characterised in that
Described first input end feeder line head P1 is vertical with one end of described first port feedline (2) to be connected, described second input
Feeder line head P2 is vertical with one end of described second port feedline (5) to be connected, described first outfan feeder line head P3 and the described 3rd
One end of port feedline (3) vertically connects, and described second outfan feeder line head P4 hangs down with one end of described 4th port feedline (4)
Direct-connected connect.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105914469A (en) * | 2016-06-01 | 2016-08-31 | 华南理工大学 | Microstrip line Butler matrix provided with bandpass filtering characteristic and based on uniform impedance resonators |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105914469A (en) * | 2016-06-01 | 2016-08-31 | 华南理工大学 | Microstrip line Butler matrix provided with bandpass filtering characteristic and based on uniform impedance resonators |
| CN105914469B (en) * | 2016-06-01 | 2018-09-14 | 华南理工大学 | The microstrip line butler matrix with band-pass filtering property based on uniform impedance resonator |
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