CN209929493U - Filtering power division and phase shift integrated antenna array feed network - Google Patents
Filtering power division and phase shift integrated antenna array feed network Download PDFInfo
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- CN209929493U CN209929493U CN201920666774.6U CN201920666774U CN209929493U CN 209929493 U CN209929493 U CN 209929493U CN 201920666774 U CN201920666774 U CN 201920666774U CN 209929493 U CN209929493 U CN 209929493U
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Abstract
The utility model discloses a filtering power division phase shift integrated antenna array feed network, which comprises an upper layer metal floor, a lower layer metal floor, a metal connecting column, a coaxial feed port, a suspension medium substrate, a suspension strip line and two phase modulation medium substrates; the upper and lower metal floors are grounded through the metal connecting column, the suspension strip line is arranged on the suspension medium substrate, the suspension medium substrate is horizontally arranged between the two phase modulation medium substrates, and the two phase modulation medium substrates are horizontally arranged between the upper and lower metal floors; the suspension strip line comprises a one-to-three filtering power dividing unit, two one-to-two unequal filtering power dividing units, two phase shifting lines I and two phase shifting lines II, wherein the two phase modulation medium substrates cover partial areas of the one-to-three filtering power dividing unit, the two phase shifting lines I and the two phase shifting lines II. The utility model discloses divide filtering, merit and three kinds of functional circuit that shift the phase and carried out the integrated design, avoided the problem of cascade mismatch between the different functional circuit of conventional design.
Description
Technical Field
The utility model relates to an antenna feed network field among the wireless communication system especially relates to a filtering merit divides antenna array feed network of phase shift integration.
Background
The antenna feed network is generally composed of passive devices such as a power divider, a phase shifter, a coupler and the like, and is applied to an antenna system with a plurality of radiation units to meet amplitude distribution and phase distribution required by feeding of each radiation unit. Besides the feed network, the antenna also needs to be cascaded with a filter to filter out other unnecessary signals and avoid interference.
In the conventional design, devices such as a power divider, a phase shifter, a filter and the like are independently designed, and then the devices such as the power divider, the phase shifter and the like are cascaded to form a feed network, and then the feed network is cascaded with the filter. The method brings inevitable cascade mismatch problem, so that the insertion loss of the whole circuit is increased, the performance is deteriorated, and the circuit volume is larger. In addition, the antenna needs to give consideration to co-channel interference and optimal coverage, amplitude distribution and phase distribution of each output of the feed network need to be adjusted through optimization during beam forming, wherein adjustment of the phase distribution is more important, and in order to better meet phase distribution required by electric tilt down of antenna beam forming, the feed network can flexibly adjust phase difference of each output signal, and better applicability can be achieved.
SUMMERY OF THE UTILITY MODEL
In order to overcome the shortcoming and the not enough that prior art exists, the utility model provides a filtering merit divides antenna array feed network of phase shift integration avoids the problem of cascade mismatch between the different functional circuit of conventional design, reduces circuit insertion loss and volume, promotes the wholeness ability. In addition, the phase difference of signals between output ports can be conveniently controlled by moving the position of the phase modulation medium substrate, and the phase distribution requirement required by the antenna radiation unit is met.
The purpose of the utility model can be realized by the following technical scheme:
a filtering power division and phase shift integrated antenna array feed network comprises an upper layer metal floor, a lower layer metal floor, metal connecting columns, coaxial feed ports, a suspension dielectric substrate, a suspension strip line and two phase modulation dielectric substrates;
the upper and lower metal floors are grounded through the metal connecting column, the suspension strip line is arranged on the suspension medium substrate, the suspension medium substrate is horizontally arranged between the two phase modulation medium substrates, and the two phase modulation medium substrates are horizontally arranged between the upper and lower metal floors;
the suspension strip line comprises a one-to-three filtering power dividing unit, two one-to-two unequal filtering power dividing units, two phase shifting lines I and two phase shifting lines II, and the two phase modulation dielectric substrates cover partial areas of the one-to-three filtering power dividing unit, the two phase shifting lines I and the two phase shifting lines II.
The two one-in-two unequal-division filtering power division units are symmetrically arranged on two sides of the one-in-three filtering power division unit, three output ends of the one-in-three filtering power division unit output equal-amplitude in-phase signals, two output ends of the one-in-three filtering power division unit are respectively connected with the phase shift line I on the two sides, and the other output end of the one-in-three filtering power division unit is connected with the coaxial feed port;
the input end of the one-to-two filtering power dividing unit is connected with the phase shifting line I, and the two output ends output signals with same phase and different amplitude, and are respectively connected with the phase shifting line II and the coaxial feed port.
And the matching impedance of three output ends of the one-to-three filtering power dividing unit is 50 ohms.
The input end matching impedance of the one-to-two filtering power dividing unit is the characteristic impedance corresponding to the phase modulation dielectric substrate uncovered by the phase shifting line I, the output end matching impedance connected to the coaxial feed port is 50 ohms, and the other output end matching impedance is the characteristic impedance corresponding to the phase modulation dielectric substrate uncovered by the phase shifting line II.
Two rectangular grooves distributed at intervals are arranged at two ends of the phase modulation medium substrate and used as matching units, and matching between two corresponding characteristic impedances when the phase shifting line I and the phase shifting line II are uncovered and cover the phase modulation medium substrate is realized by adjusting the width and the interval of the rectangular grooves.
And the line widths of the phase shifting line I and the phase shifting line II are set to be the widths corresponding to the characteristic impedance of 50 ohms when the phase shifting line I and the phase shifting line II are covered by the phase modulation dielectric substrate.
The one-to-three filtering power dividing unit realizes a filtering function by four open-circuit branch loading structures;
the one-to-two unequal filtering power division unit realizes the filtering function by three open-circuit branch loading structures.
The output end power ratio of the one-to-two unequal filtering power division unit is-1.6 dB to-5.1 dB.
The coaxial feed ports and the metal connecting columns are six in number, the coaxial feed ports comprise coaxial lines, the coaxial lines enable the inner conductors to be welded on the circuit of the suspension medium substrate through the through holes of the metal connecting columns, and the outer conductors are in contact with the metal connecting columns to achieve grounding.
The feed network simultaneously realizes three functions of filtering, power division and phase shifting.
The utility model has the advantages that:
1. the filter, power division and phase shift functional circuits are integrally designed, compared with a method of independently designing and then cascading different functional circuits in a conventional design, the problem of cascade mismatch is avoided, circuit insertion loss is reduced, overall performance is improved, and meanwhile circuit size is reduced.
2. By moving the position of the phase modulation dielectric substrate, the phase difference between different output ports of the feed network can be conveniently controlled, and the phase distribution requirement required by the antenna beam forming electric tilt down adjustment is met.
Drawings
Fig. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic diagram of the present invention;
fig. 3 is a top view of the present invention;
fig. 4a is a dimension labeling diagram of the power dividing unit of the feed network with one-to-three filtering according to the present invention;
fig. 4b is a dimension labeling diagram of the power dividing unit of the power feeding network with one-to-two unequal power filtering of the present invention;
fig. 4c is a dimension drawing of the feeding network phase modulation medium substrate of the present invention;
fig. 5 is a frequency response characteristic curve diagram of the feed network of the present invention;
fig. 6a shows the phase difference between the P3 and P5 output signals when the feeding network phase modulation medium substrate moves to the right;
fig. 6b shows the phase difference between the P4 and P6 output signals when the feeding network phase modulation medium substrate moves to the right.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
Examples
As shown in fig. 1, a filtering power division and phase shift integrated antenna array feed network comprises an upper metal floor 1, a lower metal floor 1, six metal connecting columns 2, a coaxial feed port 3, a suspension dielectric substrate 4, a suspension strip line 5 and two phase modulation dielectric substrates 6; the two phase modulation medium substrates have the same structure size.
As shown in fig. 2, the utility model discloses feed network integrated design's functional block diagram, the feed network of conventional design is by the wave filter of independent design, merit divide the ware and move looks ware cascade and constitute, and the circuit has inevitable cascade mismatch problem, the utility model discloses carry out the integration with a plurality of devices and design into single device and realize original function, promote circuit wholeness ability, reduce the circuit volume simultaneously.
The upper and lower metal floors are grounded through six metal connecting columns arranged between the two metal floors, the six metal connecting columns are arranged in a straight line shape, and the upper and lower metal floors are horizontally arranged.
The six coaxial feed ports P1-P6 are realized in a manner that the coaxial wires weld the inner conductor on the circuit of the suspension medium substrate through the through hole of the metal connecting column, and the outer conductor is in contact with the metal connecting column to realize grounding.
As shown in fig. 3, the two phase modulation dielectric substrates are horizontally disposed between two layers of dielectric substrates, the suspension dielectric substrate is disposed between the two phase modulation dielectric substrates, the suspension stripline is printed on the suspension dielectric substrate, and includes a one-to-three filtering power dividing unit, two one-to-two unequal filtering power dividing units, two phasing lines one, and two phasing lines two, the one-to-three filtering power dividing unit is located at a middle position, other circuits are symmetrically disposed on two sides of the one-to-three filtering power dividing unit, and the two phase modulation dielectric substrates cover partial areas of the one-to-three filtering power dividing unit, the two phasing lines one, and the two phasing lines two.
Two ends of two phase modulation medium substrates are provided with two rectangular grooves distributed at intervals for changing the characteristic impedance of the corresponding area suspension strip line, wherein, the strip line of the corresponding area of the rectangular groove is a high impedance line, the strip line of the corresponding area between the two grooves is a low impedance line, the strip line of three parts forms a step impedance structure, as a matching unit 9, the electrical length of each part of the step impedance structure is changed by adjusting the width and the interval of the two rectangular grooves, and the matching between the two corresponding characteristic impedances when the phase shifting line I and the phase shifting line II are uncovered and cover the phase modulation medium substrates is realized. Meanwhile, the range of the first phase shifting line and the second phase shifting line on the left side and the right side covered by the dielectric substrate is changed by moving the phase modulation dielectric substrate, so that the equivalent electrical lengths of the first phase shifting line and the second phase shifting line on the left side and the right side are changed, and different phase differences among output ports are realized.
The one-to-three filtering power dividing unit 7 realizes a filtering function through four open-circuit branch loading structures, the input end of the one-to-three filtering power dividing unit is connected with the coaxial feed port P1, the three outputs are in equal amplitude and same phase and are matched with 50 ohms at the same time, one output is connected to the coaxial feed port P2, and the other two outputs are connected to one end of two phasing lines, namely one lps 1.
As shown in fig. 3, the filtering function of the one-to-two unequal filtering power dividing unit 8 is implemented by three open-circuit minor matters loading structures, two outputs are in phase, the power ratio is-1.6 dB to-5.1 dB, the input of the power dividing unit is connected to the other end of the phase shifting line one, the matching impedance is the characteristic impedance corresponding to the phase shifting line one when the phase shifting line one is not covered by the phase modulating dielectric substrate, the output of the power dividing unit is connected to the coaxial feed port P4 or P6, the matching impedance is 50 ohms, the other end of the power dividing unit is connected to one end of the phase shifting line two lps2, the other end of the phase shifting line two lps2 is connected to the coaxial feed port P3 or P5, and the matching impedance is the characteristic impedance corresponding to the phase. And when the line widths of the phase shifting line I and the phase shifting line II are set to cover the phase modulation dielectric substrate, the characteristic impedance is the width corresponding to 50 ohms.
In this embodiment, the utility model discloses feed network's operating frequency is 1.4-2.7GHz, the panel thickness that suspension medium base plate processing adopted is 0.2mm, relative dielectric constant is 3.38, the tangent loss is 0.0027, the panel thickness that phase modulation medium base plate processing adopted is 3.048mm, relative dielectric constant is 2.94, the tangent loss is 0.0012, the distance between upper and lower floor metal floor is 6.4mm, each item size mark that feed network circuit corresponds is as shown in fig. 3 to 4a, 4b, 4c, concrete parameter is as follows:
w0＝4.3mm,w1＝1.4mm,w2＝0.9mm,w3＝0.7mm,w4＝2.3mm,w5＝3.8mm, w6＝4.8mm,w7＝1.2mm,w8＝3.0mm,w9＝2.6mm,w10＝2.2mm,w11＝2.5mm, w12＝8.4mm,w13＝2mm,w14＝3.5mm,w15＝6.6mm,w16＝7.6mm,ws1＝2.8mm, ws2＝1.1mm,ws3＝2.4mm,ws4＝3mm,ws5＝3.3mm,ws6＝2.4mm,ws7＝3.8mm, wp＝9.2mm,l0＝7mm，l1＝6.6mm，l2＝9.8mm，l3＝8.6mm，l4＝13.8mm，l5＝2.9mm，l6＝16mm，l7＝15.2mm，l8＝18.2mm，l9＝7.8mm，l10＝10.8mm，l11＝6mm，l12＝13.1mm， l13＝26.6mm，l14＝23.5mm，l15＝30.2mm，l16＝22.6mm，ls1＝8.2mm，ls2＝11.1mm， ls3＝11.3mm，ls4＝11.8mm，ls5＝17.4mm，ls6＝20.6mm，ls7＝17.3mm，lp＝4mm， lps1＝119mm，lps2＝105mm,lx＝256.4mm，lx1＝18mm,lx2＝10.8mm,lx3＝7.1mm，ly＝51mm， ly1＝36.1mm。
as shown in FIG. 5, for the frequency response characteristic curve of the feeding network of the present invention, the pass band is within the range of 1.4-2.7GHz, S11Less than-20 dB indicates that the input ports are well matched. Since the power ratio of the one-to-two unequal filtering power dividing unit in this embodiment is-1.6 dB: -5.1dB, ideally, the signal power ratio between the output ports is S21:S31:S41:S51:S61-4.77dB: -9.87dB: -6.37dB: -9.87dB: -6.37 dB. It can be seen from fig. 5 that the amplitudes of the output signals of the port P3 and the port P5 are substantially equal, the amplitudes of the output signals of the port P4 and the port P6 are substantially equal, the degree of imbalance of the amplitudes of the output signals is less than 1.5dB, and the insertion loss of the circuit is not more than 1.6dB except for the power distribution part in the passband frequency range. In the out-of-band 3.38-5GHz frequency range, the suppression level is more than 40dB, and the circuit has high sideband roll-off characteristics and out-of-band suppression capability and good filtering performance.
As shown in fig. 6a, in order to realize the phase difference between the output signals of the port P3 and the port P5 when the feeding network phase modulation dielectric substrate moves rightward (the moving distance is denoted as dm), and fig. 6b shows the phase difference between the output signals of the port P4 and the port P6, it can be seen that, when the phase modulation dielectric substrate does not move (dm is 0mm), the output signals of the port P3 and the port P5 are substantially in phase, and the output signals of the port P4 and the port P6 are substantially in phase, within the operating frequency range of 1.4-2.7 GHz. The phase difference between the output signals increases as the moving distance dm increases, and when dm is 20mm, the phase difference between the output signals of the port P3 and the port P5 fluctuates by [ -77.3 °, -174.3 ° ] in the passband frequency range, and the phase difference between the output signals of the port P4 and the port P6 fluctuates by [ -37.7 °, -90.9 ° ] in the passband frequency range. Because only phase shift line one passes from port P1 to port P4 and port P6, and phase shift line one and phase shift line two passes from port P1 to port P3 and port P5, due to symmetry, when the phase-modulating dielectric substrate moves, the phase difference of the output signals of port P3 and port P5 is twice as much as that of the output signals of port P4 and port P6, and as a result, the rule is basically met.
To sum up, the utility model provides a filtering merit divides antenna array feed network of integration of shifting phase has integrated filtering, merit and has shifted phase multiple functions, wherein, through the position of removing phase modulation medium base plate, can conveniently control the phase difference of signal between the output port. The utility model discloses the circuit has multiple performance advantages such as the loss is low, the integrated level is high, small, is applicable to among many radio frequency systems.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (9)
1. A filtering power division and phase shift integrated antenna array feed network is characterized by comprising an upper layer metal floor, a lower layer metal floor, metal connecting columns, a coaxial feed port, a suspension medium substrate, a suspension strip line and two phase modulation medium substrates;
the upper and lower metal floors are grounded through metal connecting columns, the suspension strip line is arranged on a suspension medium substrate, the suspension medium substrate is horizontally arranged between two phase modulation medium substrates, and the two phase modulation medium substrates are horizontally arranged between the upper and lower metal floors;
the suspension strip line comprises a one-to-three filtering power dividing unit, two one-to-two unequal filtering power dividing units, two phase shifting lines I and two phase shifting lines II, and the two phase modulation dielectric substrates cover partial areas of the one-to-three filtering power dividing unit, the two phase shifting lines I and the two phase shifting lines II.
2. The antenna array feed network of claim 1, wherein the two divide-by-two unequal filter power dividing units are symmetrically disposed at two sides of the divide-by-three filter power dividing unit, three output terminals of the divide-by-three filter power dividing unit output equal-amplitude in-phase signals, two of the output terminals are respectively connected to the phase-shifting lines at two sides, and the other output terminal is connected to the coaxial feed port;
the input end of the one-to-two filtering power dividing unit is connected with the phase shifting line I, and the two output ends output signals with same phase and different amplitude, and are respectively connected with the phase shifting line II and the coaxial feed port.
3. The antenna array feed network of claim 2, wherein the matching impedance of the three output ends of the divide-by-three filtering power dividing unit is 50 ohms.
4. An antenna array feed network according to claim 2,
the input end matching impedance of the one-to-two filtering power dividing unit is the characteristic impedance corresponding to the phase shifting line I uncovered with the phase modulation medium substrate, the output end matching impedance connected to the coaxial feed port is 50 ohms, and the other output end matching impedance is the characteristic impedance corresponding to the phase shifting line II uncovered with the phase modulation medium substrate.
5. The antenna array feed network of claim 1, wherein two rectangular slots spaced apart are provided at two ends of the phase modulating dielectric substrate as matching units.
6. The antenna array feed network of claim 1, wherein the linewidths of the phasing lines one and two are configured to have a width corresponding to a characteristic impedance of 50 ohms when covered by a phase modulating dielectric substrate.
7. The antenna array feed network of claim 1, wherein the divide-by-three filtering power dividing unit implements filtering function by four open-circuit branch loading structures;
the one-to-two unequal filtering power division unit realizes the filtering function by three open-circuit branch loading structures.
8. The antenna array feed network of claim 1, wherein the power ratio of the output end of the one-to-two unequal filtering power division unit is-1.6 dB-5.1 dB.
9. The antenna array feed network of claim 1, wherein there are six coaxial feed ports and metal connection posts, the coaxial feed ports comprising a coaxial wire having an inner conductor soldered to the circuitry of the suspended dielectric substrate through a via in the metal connection post and an outer conductor in contact with the metal connection post for grounding.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112572A (en) * | 2019-05-10 | 2019-08-09 | 华南理工大学 | A kind of filtering function divides phase shift integrated aerial array feeding network |
| CN112736378A (en) * | 2020-12-01 | 2021-04-30 | 武汉虹信科技发展有限责任公司 | Filtering phase shifter and antenna |
-
2019
- 2019-05-10 CN CN201920666774.6U patent/CN209929493U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112572A (en) * | 2019-05-10 | 2019-08-09 | 华南理工大学 | A kind of filtering function divides phase shift integrated aerial array feeding network |
| WO2020228402A1 (en) * | 2019-05-10 | 2020-11-19 | 华南理工大学 | Filtering, power-dividing and phase-shifting integrated antenna array feed network |
| US11450951B2 (en) | 2019-05-10 | 2022-09-20 | South China University Of Technology | Filtering, power-dividing and phase-shifting integrated antenna array feed network |
| CN110112572B (en) * | 2019-05-10 | 2024-01-23 | 华南理工大学 | Filtering power division and phase shift integrated antenna array feed network |
| CN112736378A (en) * | 2020-12-01 | 2021-04-30 | 武汉虹信科技发展有限责任公司 | Filtering phase shifter and antenna |
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Assignee: GUANGDONG SHENGLU TELECOMMUNICATION TECH. Co.,Ltd. Assignor: SOUTH CHINA University OF TECHNOLOGY Contract record no.: X2020440000160 Denomination of utility model: An antenna array feed network based on filtering, power division and phase shift integration Granted publication date: 20200110 License type: Common License Record date: 20201228 |
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