CN106972267B - Spatial stereo phase shifter applied to base station antenna - Google Patents
Spatial stereo phase shifter applied to base station antenna Download PDFInfo
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- CN106972267B CN106972267B CN201710296382.0A CN201710296382A CN106972267B CN 106972267 B CN106972267 B CN 106972267B CN 201710296382 A CN201710296382 A CN 201710296382A CN 106972267 B CN106972267 B CN 106972267B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/18—Phase-shifters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/18—Phase-shifters
- H01P1/184—Strip line phase-shifters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
- H01Q3/32—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by mechanical means
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- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention relates to a space three-dimensional phase shifter applied to a base station antenna, which comprises a conductor shell, a feed network component and an insulation component, wherein the conductor shell is internally provided with a plurality of layers of conductor cavities; the space three-dimensional phase shifter also comprises a transmission line which is used for connecting the adjacent two layers of interlayer feed network components and is insulated with the conductor shell. The lower layer feed network comprises a first input port and two first output ports, the upper layer feed network comprises two four-port networks, each four-port network comprises three second output ports and a second input port connected with one first output port through a transmission line, the four-port networks are metal conductor strip lines provided with slow wave lines or microstrip line printed circuit boards provided with slow wave lines, and when the phase shifter is applied to a base station antenna, the phase shifter has a larger electrical downtilt angle which is 0-20 degrees; the phase shifter has six radiators, the antenna length is about 0.7 m, and the highest gain reaches 16.5 dBi.
Description
Technical Field
The invention relates to the technical field of communication devices, in particular to a spatial stereo phase shifter applied to a base station antenna.
Background
At present, the base station electrically-tuned antenna realizes the downtilt adjustment of the beam of the base station antenna through a phase shifter in a beam forming network, and has the advantages of large downtilt adjustable range, high precision, good directional diagram control, strong anti-interference capability, easy control and the like. Therefore, the phase shifter is an essential component of the base station antenna, and the device adjusts the down tilt angle of the antenna beam by changing the relative phase between the antenna units, thereby facilitating the optimization of the communication network.
The beam forming network design of the existing base station antenna uses cables to connect each sub-phase shifter unit, or uses the cables as a part of a power divider, so that the whole feed network contains cables with different lengths, the length of each cable must be ensured to be accurate during processing, workers must weld carefully as required during welding, otherwise, the consistency of an antenna directional diagram cannot be ensured; secondly, the cables are processed, classified and managed according to the lengths of the different cables, the cables are installed in production and are extremely complex, welding spots are extremely numerous, each welding spot is an unstable factor to the whole machine, the influence factors of three-order intermodulation of the antenna are greatly increased due to the excessive welding spots, the repair cost is increased, and the production cost is increased; in addition, the cables used by the existing antennas are 141 cables, the loss of the cables is large, especially in a high-frequency band, the gain of the antenna is greatly reduced, so that a longer and larger antenna needs to be designed to improve the gain, and the cost is increased; moreover, when a cable goes wrong, all the results are wrong, the damage probability is high, and the maintenance cost is high.
In summary, it is necessary to design a highly integrated phase shifter without using cable, especially for the conventional 610-.
Disclosure of Invention
In order to solve the technical problems, the invention provides a space three-dimensional phase shifter applied to a base station antenna, which has high reliability, high repeatability, low insertion loss and high gain. The antenna efficiency using such a network will reach over 90%; compared with the traditional antenna, the gain is improved by 1-2 dBi.
In order to realize the technical effect of the invention, the following technical scheme is adopted for realizing the technical effect:
a space three-dimensional phase shifter applied to a base station antenna comprises a conductor shell internally provided with an upper layer of conductor cavity and a lower layer of conductor cavity, and a feed network component arranged in each layer of conductor cavity, wherein a lower layer feed network arranged on the lower layer feed network component comprises a first input port and two first output ports; the upper layer feed network arranged on the upper layer feed network component comprises two four-port networks, and each four-port network comprises three second output ports and a second input port connected with one first output port through a transmission line; the four-port network is a metal conductor strip line provided with a slow wave line or a microstrip line printed circuit board provided with a slow wave line.
As a further improvement, the feed network component comprises a sub phase shifter component for adjusting the beam direction of the base station antenna and an insulating component for supporting the sub phase shifter component, and the sub phase shifter component comprises a feed network connected with the transmission line and a dielectric element component connected with the feed network in a sliding way; the transmission line is arranged in the conductor shell; the lower layer feed network is a metal conductor strip line or a printed circuit board provided with a microstrip line.
As a further improvement, each layer of conductor cavity is integrally formed, two ends of each layer of conductor cavity are respectively provided with a cavity opening for the feed network component to move in or out, and the conductor shell is formed by overlapping and combining a plurality of layers of conductor cavities or integrally formed by metal conductor profiles.
As a further improvement, the insulating assembly is an insulating medium substrate, the insulating medium substrate arranged in each layer of conductor cavity is composed of an insulating medium substrate a and an insulating medium substrate B arranged in the layer of conductor cavity, and the insulating medium substrate a and the insulating medium substrate B arranged in the layer of conductor cavity are respectively arranged above and below the feed network arranged in the layer of conductor cavity.
As a further improvement, the dielectric element component arranged in the conductor cavity of the layer is also fixedly connected with a pull rod, the insulation component arranged in the conductor cavity of the layer is fixedly connected with the feed network arranged in the conductor cavity of the layer, and the insulation component arranged in the conductor cavity of the layer is fixedly connected with the conductor shell.
As a further improvement, the feeding network arranged in each layer of conductor cavity comprises a metal conductor sheet and a plurality of ports connected with the metal conductor sheet.
As a further improvement, each first output port is connected to one second input port via one transmission line.
As a further improvement, the top of the conductor shell is provided with a window communicated with the upper layer conductor cavity, the window comprises a window a and two windows B, and each window B comprises a first window arranged right above each second output port of a four-port network and a second window arranged right above a second input port of the four-port network; the second window of each window B is also arranged right above a transmission line connected with the second input port of the four-port network and a first output port connected with the transmission line; the conductor shell also comprises a conductor partition plate which is arranged in each layer of conductor cavity and is provided with an opening, and the conductor partition plate arranged in each layer of conductor cavity divides the layer of conductor cavity into a left conductor cavity and a right conductor cavity which are mutually communicated; a boss is fixedly arranged on one side of the insulating medium substrate arranged in each layer of the conductor cavity, and the boss is clamped in an opening of the conductor partition plate in the conductor cavity; the metal conductor sheet of the feed network arranged in each layer of conductor cavity is arranged in the left conductor cavity, and the port connected with the metal conductor sheet arranged in the conductor cavity penetrates through the left conductor cavity and extends into the right conductor cavity.
As a further improvement, the conductor partition plate comprises an upper conductor partition plate arranged in the upper conductor cavity and a lower conductor partition plate arranged in the lower conductor cavity, the upper conductor partition plate divides the upper conductor cavity into a left upper conductor cavity and a right upper conductor cavity, and the lower conductor partition plate divides the lower conductor cavity into a left lower conductor cavity and a right lower conductor cavity; the top of the right lower layer conductor cavity is provided with a through hole, one end of the transmission line is arranged in the right lower layer conductor cavity, and the other end of the transmission line penetrates through the through hole and extends into the right upper layer conductor cavity.
As a further improvement, the lower conductor partition plate is provided with a first opening and two second openings, the upper conductor partition plate is provided with twelve third openings and two fourth openings, the first input port penetrates through the first opening from the left lower conductor cavity and extends into the right lower conductor cavity, and each first output port penetrates through one second opening from the left lower conductor cavity and extends into the right lower conductor cavity; a second output port of each four-port network extends into the upper right conductor cavity from the upper left conductor cavity through a third opening, and a second input port of the four-port network extends into the upper right conductor cavity from the upper left conductor cavity through a fourth opening.
As a further improvement, the projections of a first output port and a second input port connected by a transmission line in the horizontal direction are staggered, and the transmission line is connected with the first output port and the second input port respectively.
As a further improvement, the conductor housing further comprises a guide boss fixedly arranged in each layer of the conductor cavity, and the pull rod arranged in the conductor cavity and the dielectric element assembly arranged in the conductor cavity enclose a guide groove matched with the guide boss.
As a further improvement, the number of the guide bosses arranged in each layer of conductor cavity is two, and the pull rod arranged in the conductor cavity is clamped in a groove formed by the two guide bosses and the left side wall, the top wall and the bottom plate of the conductor cavity.
As a further improvement, a strip window is further formed in the conductor shell, an anchor is further fixedly connected to the pull rod in the conductor cavity, the anchor arranged in the conductor cavity penetrates through the strip window and can move back and forth along the strip window, the anchor is arranged in the upper-layer conductor cavity, and the anchor arranged in the upper-layer conductor cavity is connected with the pull rod arranged in the lower-layer conductor cavity through a first connecting portion; or the anchor is arranged in the lower conductor cavity, and the anchor arranged in the lower conductor cavity is connected with the pull rod arranged in the upper conductor cavity through a first connecting part; or the upper and lower conductor cavities are provided with anchors, and the anchors arranged in the upper conductor cavity and the anchors arranged in the lower conductor cavity are connected through a first connecting part.
As a further improvement, the dielectric element assembly arranged in each layer of the conductor cavity comprises at least one dielectric element, each dielectric element arranged in the layer of the conductor cavity is respectively and fixedly connected with the pull rod arranged in the layer of the conductor cavity, and each dielectric element is provided with at least two gaps for adjusting the contact area between the feed network arranged in the layer of the conductor cavity and the dielectric element; each dielectric element is integrally formed by injection molding.
As a further improvement, the dielectric constant values of the dielectric element assemblies disposed in each layer of the cavity are set so that the phases of the feed networks disposed in each layer of the cavity can be changed synchronously when the dielectric element assemblies disposed in each layer of the conductor cavity are moved synchronously.
As a further improvement, the dielectric element assembly arranged in each layer of conductor cavity is arranged on the left side of the feed network assembly, and the insulating medium substrate and the dielectric element assembly arranged in each layer of conductor cavity are arranged in the left conductor cavity.
As a further improvement, the insulating medium substrate is made of one or more materials of polypropylene, polyethylene, polytetrafluoroethylene and poly 4-methylpentene-1.
As a further improvement, the insulating dielectric substrate is made of a foamed material.
As a further improvement, the positions of the upper and lower feeding network components can be exchanged.
The invention also provides a spatial stereo phase shifter component, which comprises any one of the two spatial stereo phase shifters which are connected with each other, and the two spatial stereo phase shifters are arranged in a left-right mirror image manner.
As a further improvement, the phase shifter assembly further comprises second connecting parts fixedly connected with the anchors at the upper parts of the two spatial stereo phase shifters respectively.
Compared with the prior art, the invention has the following beneficial effects:
1) the feed network components are placed in each layer of conductor cavity, the feed network components arranged in the adjacent two layers of conductor cavities are connected through the transmission lines to form a space three-dimensional feed network, and the feed network originally positioned on the same layer is divided into two parts and placed in a plurality of identical conductor cavities which are overlapped mutually, so that the width of the whole phase shifter is reduced. When the conductor cavity is two layers, the width of the whole phase shifter is reduced by nearly 50%, the thickness of the phase shifter is increased by only 7mm, and when the spatial stereo phase shifter is used for a base station antenna, because double space exists, a cable in a space integrated feed network can be used, a strip line and the like are used for replacing the cable, a highly integrated beam forming network without the cable is designed, and the highly integrated beam forming network enables the antenna to have the minimum welding point, so that the production efficiency and consistency of the antenna are improved, the volume of the antenna is reduced by nearly 50%, materials are saved, the cost is reduced, and the antenna is convenient to transport and flexibly net.
2) When the feed network is applied to a base station antenna, only the main feed line and the input port of the feed network and the connection port of the oscillator and the feed network need to be welded, so that the number of welding spots of the antenna using the technology is far smaller than that of the welding spots of a competitor antenna, the probability of intermodulation generation is reduced during production, the intermodulation through rate during antenna production is improved, and the consistency of standing waves is good.
3) When the spatial stereo phase shifter is used for a base station antenna, because the components realize modularization, the assembly of the antenna is very simple, and compared with the antenna in the prior art, fewer assembly workers are needed, and compared with the prior art, cables with different lengths do not need to be cut, the accurate length of each cable does not need to be ensured, whether a supervision worker welds the cable at a correct position in production is not needed, and the quality of the welding for checking by QC personnel is reduced.
4) The traditional adjustable phase shifting device of the array antenna is that a separate conductor cavity is supported by a support column on the back surface of a reflecting plate, the phase shifting device is installed in the conductor cavity, and the elements of the traditional array antenna are connected by cables. The U-shaped reflecting plate and the phase shifter cavity are integrally formed, the reflecting plate (the surface of the conductor shell) and the phase shifter conductor cavity share one surface, the reflecting plate and the phase shifter conductor cavity are not mutually independent, in the existing design, the reflecting plate and the phase shifter are mutually independent parts, the phase shifter is supported on the reflecting plate, and a transmission mechanism of the phase shifter is also higher than the cavity of the phase shifter, so that the height of the antenna is increased. The phase shifting device and the strip line are directly installed in the conductor cavity, the transmission mechanism is buried in the reflecting plate (the surface of the conductor shell) and the phase shifter cavity, the whole thickness of the antenna can be well reduced, the antenna is thinner than that of any competitor due to the design, the size and the volume of the whole antenna are reduced, the wind resistance is reduced, and the station building cost of an operator is correspondingly reduced.
5) Because the feed network of the electrically tunable antenna is very complicated, the antenna design of the existing base station antenna enterprise uses a large number of coaxial cables, so that the welding points of the antenna are too many, and the wiring is very complicated, therefore, a large number of workers are needed in the production process of the base station antenna, and the realization of automation is very difficult. Because the design has the characteristic of high integration, the product designed by the technology can be completely automatically produced in the production process, all welding and assembling are completely realized by the robot, and the production efficiency of the antenna is 5-8 times that of the traditional antenna enterprise, and the consistency of the produced antenna is greatly improved and the reject ratio is reduced due to the characteristic of high integration. The phase shifter has simple structure and easy installation and maintenance, and can obviously improve the production efficiency.
6) The lower layer feed network comprises a first input port and two first output ports; the upper layer feed network comprises two four-port networks, each four-port network comprises three second output ports and one second input port connected with one first output port through a transmission line. The number of the transmission lines for connecting the upper and lower feeding networks is two, and the whole network forms a network of one input port and six output ports after the upper and lower feeding networks are connected into a whole. Because the transmission line is only two, correspondingly, the number of the windows for accommodating the transmission line processed on the cavity is only two, the CNC processing amount can be reduced, and the processing cost is reduced.
7) The invention adopts the transmission line connection, the welding points are correspondingly reduced, the welding instability factors are correspondingly reduced, and the maintenance cost is reduced.
8) Because the top layer strip line adopts a one-to-three scheme (namely, the four-port network is divided into three second output ports and one second input port connected with one first output port through a transmission line), the number of parts is correspondingly reduced, and the length of the bottom layer strip line is correspondingly reduced. For example, a base station antenna designed based on a feed network with one input and six output ports has six radiators with a top stripline with only two separate four port networks and one lower feed network. For a base station antenna with six radiators, the length of the base station antenna at least exceeds 2.5 meters, and if the top layer strip line is a one-to-three scheme, the length of the bottom layer strip line is reduced, so that the processing difficulty is reduced, and the manufacturing cost of the strip line is reduced. When the antenna works, the leakage of electromagnetic waves is reduced, the coupling is reduced, S parameters are improved, the performance is improved, the length of the antenna is 0.7 m, and the highest gain reaches 16.5 dBi; the four-port network is a metal conductor strip line provided with a slow wave line or a microstrip line printed circuit board provided with a slow wave line, and the phase shifter has a larger electrical downtilt angle when being applied to a base station antenna, and the angle is 0-20 degrees.
Drawings
FIG. 1-1 is a schematic partial perspective view of a spatial phase shifter;
FIG. 1-2 is an enlarged schematic view of a portion of the structure of FIG. 1-1;
FIG. 2-1 is a partial schematic view of a spatial phase shifter;
FIG. 2-2 is an enlarged schematic view of a portion of the structure of FIG. 2-1;
FIG. 3-1 is a schematic view of a dielectric element assembly and a tie rod assembly disposed in an upper conductor cavity;
FIG. 3-2 is a schematic view of a dielectric element assembly disposed in an underlying conductor cavity;
FIG. 4-1 is a schematic diagram of a feed network assembly;
FIG. 4-2 is an enlarged view of a portion of the structure of FIG. 4-1;
FIG. 4-3 is a schematic diagram of the structure of the transmission line of FIG. 4-1;
FIG. 5-1 is a schematic diagram of a phase shifter assembly according to the present invention;
FIG. 5-2 is an enlarged view of a portion of the structure of FIG. 5-1;
FIGS. 5-3 are vertical plane patterns of the present invention when applied to a base station antenna with an electrical downtilt of 0 degrees;
fig. 5-4 are vertical plane patterns of the present invention when applied to a base station antenna with 20 electrical downtilt.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
As shown in the figure, the spatial stereo phase shifter applied to the base station antenna comprises a conductor shell 100 internally provided with two layers of conductor cavities and a feed network component arranged in each layer of conductor cavity, wherein the feed network component comprises a sub phase shifter component for adjusting the beam direction of the base station antenna and an insulating component for supporting the sub phase shifter component; the space three-dimensional phase shifter also comprises a transmission line which is respectively connected with the sub-phase shifter components arranged in the two adjacent layers of conductor cavities; the sub phase shifter assembly comprises a feed network connected with the transmission line and a dielectric element assembly connected with the feed network in a sliding manner, and the dielectric element assembly arranged in the conductor cavity of one layer changes the contact area between the dielectric element assembly and the feed network by sliding back and forth relative to the feed network arranged in the conductor cavity; the two conductor cavities are an upper conductor cavity 109 and a lower conductor cavity 110 respectively, the feed network arranged in the upper conductor cavity 109 is an upper feed network, the feed network arranged in the lower conductor cavity 110 is a lower feed network, and the lower feed network comprises a first input port 205 and two first output ports 206; the upper layer feed network comprises two four-port networks 410, each of which comprises three second output ports (201, 203, 204) and one second input port 202 connected to one first output port 206 by a transmission line 210; the four-port network is a metal conductor strip line provided with a slow wave line 430 or a microstrip line printed circuit board provided with the slow wave line 430.
And the feed network components in the two adjacent layers of conductor cavities are connected to form a complete space three-dimensional feed network.
According to the invention, the feed network component is placed in each layer of conductor cavity, and the feed network components arranged in the adjacent two layers of conductor cavities are connected by the transmission line to form a spatial three-dimensional feed network, so that the volume of the feed network is greatly reduced, and the volume of the phase shifter is greatly reduced.
The sub phase shifter component comprises a feed network connected with the transmission line and a dielectric element component connected with the feed network in a sliding mode, and the dielectric element component arranged in the conductor cavity of one layer changes the contact area of the dielectric element component and the feed network by sliding back and forth relative to the feed network arranged in the conductor cavity. When the spatial stereo phase shifter is used for a base station antenna, the contact area between the dielectric element component and the feed network component is changed by sliding the dielectric element component back and forth relative to the feed network arranged in the cavity, so that the beam direction of the base station antenna is adjusted.
Preferably, the lower layer feed network is a metal conductor strip line or a printed circuit board provided with a microstrip line.
Set up like this, can be thorough avoid using the cable, compare in prior art use cable need guarantee that every cable length is accurate, cable management difficulty, with cable mounting to the shifter complicated, reprocess with high costs, the loss is high, problem such as raw materials cost height, this application not only raw materials cost is low, production simple to operate, can reduce the cost of reprocessing moreover, and then thoroughly reduction in production cost.
In addition, the phase shifting mechanism is simple in structure and easy to install, and can obviously improve the production efficiency.
Preferably, the feeding network is arranged in the conductor housing and connected to the feeding network in the adjacent two layers of conductor cavities, so that the feeding network between the adjacent layers and the transmission line form an integral space three-dimensional feeding network. The transmission line 210 is not directly contacted with the conductor housing 100, i.e. there is a gap between the transmission line 210 and the conductor housing 100, so as to realize insulation and avoid short circuit. One end of the transmission line 210 may be disposed in a conductor cavity of one layer, and the other end of the transmission line passes through the conductor cavity of the layer and extends into a conductor cavity of another layer adjacent to the conductor cavity of the layer. The transmission line 210 is disposed in the conductor housing 100, so as to prevent leakage of electromagnetic waves. More signals can be transmitted to the antenna element.
Preferably, each layer of conductor cavity is integrally formed, two ends of each layer of conductor cavity are provided with cavities for allowing the feeding network component to move in or out, and the conductor housing 100 is formed by stacking and combining a plurality of layers of conductor cavities or integrally forming a metal conductor profile. During installation, various components of the feed network assembly can be assembled, and then the feed network assembly is inserted into the conductor cavity from the cavity opening, so that the installation time is greatly saved. Compared with the prior art, the problem that each cable needs to be welded to the phase shifter, and the number of welding points is large (the number of welding points is hundreds to thousands), so that the installation time is greatly saved.
Meanwhile, when the feed network component is damaged, the feed network component can be maintained only by moving out of the cavity opening, and the maintenance is very convenient.
Preferably, the insulating assembly is an insulating dielectric substrate, the insulating dielectric substrate arranged in each layer of conductor cavity is composed of an insulating dielectric substrate a and an insulating dielectric substrate B arranged in the layer of conductor cavity, and the insulating dielectric substrate a and the insulating dielectric substrate B arranged in the layer of conductor cavity are respectively arranged above and below the feed network arranged in the layer of conductor cavity. Namely, an insulating medium substrate A is arranged on the feed network arranged in the conductor cavity, and an insulating medium substrate B is arranged below the feed network arranged in the conductor cavity.
Preferably, the dielectric element assembly disposed in the conductor cavity of one layer is further fixedly connected with a pull rod 213, the insulating assembly disposed in the conductor cavity of the layer is fixedly connected with the feeding network disposed in the conductor cavity of the layer, and the insulating assembly disposed in the conductor cavity of the layer is fixedly connected with the conductor shell. Pulling the pull rod 213 can move the dielectric element assembly back and forth relative to the feed network, facilitating phase shifting.
Preferably, the feeding network provided in each layer of the conductor cavity comprises a metal conductor sheet and a plurality of ports connected to the metal conductor sheet. The metal conductor sheet and the plurality of ports connected to the metal conductor sheet of each feed network component may be integrally formed. The metal conductor stripline may be composed of a metal conductor piece and a plurality of ports connected to the metal conductor piece.
Preferably, each first output port is connected to one second input port via one transmission line.
Preferably, the top of the conductor housing 100 is provided with a window communicated with the upper layer conductor cavity 109, the window includes a window a105 and two windows B, each window B includes a first window disposed right above each second output port of a four-port network and a second window 102 disposed right above a second input port 202 of the four-port network; the second window 102 of each window B is further disposed right above a transmission line 210 connected to the second input port 202 of the four-port network and the first output port 206 connected to the transmission line 210; the conductor shell 100 further comprises a conductor partition plate 114 which is arranged in each layer of conductor cavity 100 and is provided with an opening, and the conductor partition plate 114 arranged in each layer of conductor cavity divides the layer of conductor cavity into a left conductor cavity and a right conductor cavity which are communicated with each other; a boss 411 is fixedly arranged on one side of the insulating medium substrate arranged in each layer of the conductor cavity, and the boss 411 is clamped in the opening of the conductor partition plate 114 in the layer of the conductor cavity; the metal conductor sheet of the feed network arranged in each layer of conductor cavity is arranged in the left conductor cavity, and the port connected with the metal conductor sheet arranged in the conductor cavity penetrates through the left conductor cavity and extends into the right conductor cavity. This facilitates the connection of the antenna element to the respective port via the window, preferably the window provided directly above each port has a larger horizontal projection than the port, and the antenna element and the port can be mounted more easily. The first window provided in a four port network includes a first window 101, a first window 103, and a first window 104.
Preferably, the conductor partition plates include an upper conductor partition plate disposed in the upper conductor cavity and a lower conductor partition plate disposed in the lower conductor cavity, the upper conductor partition plate divides the upper conductor cavity into a left upper conductor cavity 116 and a right upper conductor cavity 113, and the lower conductor partition plate divides the lower conductor cavity into a left lower conductor cavity 115 and a right lower conductor cavity 112; the top of the right lower conductor cavity is provided with a through hole, one end of each transmission line 210 is arranged in the right lower conductor cavity, and the other end of each transmission line passes through the through hole and extends into the right upper conductor cavity.
Preferably, the lower conductor partition is provided with a first opening and two second openings, the upper conductor partition is provided with six third openings and two fourth openings, the first input port 205 extends from the left lower conductor cavity into the right lower conductor cavity 112 through the first opening, and each first output port extends from the left lower conductor cavity 115 into the right lower conductor cavity 112 through one second opening; a second output port of each four-port network extends from upper left conductor cavity 116 through a third opening into upper right conductor cavity 113, and a second input port of the four-port network extends from upper left conductor cavity 116 through a fourth opening into upper right conductor cavity 113.
Preferably, a first output port and a second input port connected by a transmission line, which is connected to the first output port and the second input port, respectively, are offset in projection in the horizontal direction, preferably soldered. The first output line and the second input line which are arranged under one window are staggered through projection in the horizontal direction, and welding is facilitated.
Preferably, the conductor housing 100 further includes a guide boss 117 fixedly disposed in each conductor cavity, and the pull rod 213 disposed in the conductor cavity and the dielectric element assembly disposed in the conductor cavity enclose a guide slot 212 matching with the guide boss 117. The guiding boss 117 and the guiding groove 212 are matched, that is, the guiding groove 212 can be just sleeved outside the guiding boss 117, and the pull rod 213 and the dielectric element assembly can slide back and forth along the guiding boss 117 through the guiding groove 212, so that the pull rod arranged in the cavity is pulled, and the pull rod 213 arranged in the cavity and the dielectric element arranged in the cavity can move back and forth along the guiding boss 117, so that the back and forth movement is easier. Further, the pull rod can only move back and forth along the guide boss 117 without moving left and right, thereby more accurately adjusting the beam direction of the base station antenna.
Preferably, the number of the guide bosses 117 arranged in each layer of conductor cavity is two, and the pull rod 213 arranged in the layer of conductor cavity is clamped in a groove 118 formed by the two guide bosses and the left side wall, the top wall and the bottom plate of the conductor cavity. Further, the pull rod can only move back and forth along the guide boss 117 without moving left and right, thereby more accurately adjusting the beam direction of the base station antenna.
Preferably, the conductor housing 100 is further provided with a strip window 111, the pull rod 213 disposed in the upper conductor cavity is further fixedly connected with an anchor 211, and the anchor 211 disposed in the upper conductor cavity penetrates through (or penetrates through) the strip window and can move back and forth along the strip window; the anchor arranged in the upper conductor cavity is connected with the pull rod arranged in the lower conductor cavity through a first connecting part.
A force applied to anchor 211 in a forward or backward direction causes anchor 211 to move back and forth along strip window 111, causing upper dielectric element assembly 310 and lower dielectric element assembly 320 to move back and forth, thereby changing the contact area of the dielectric element assemblies with the feed network. The pull rod disposed in the lower conductor cavity 110 may also be provided with an anchor, and the first connecting member is fixedly connected to the anchor disposed in the lower cavity and the anchor disposed in the upper cavity, respectively.
Preferably, the dielectric element assembly disposed in each layer of the conductor cavity includes at least one dielectric element, each dielectric element disposed in the layer of the conductor cavity is respectively and fixedly connected to the pull rod disposed in the layer of the conductor cavity, and each dielectric element is provided with at least two notches for adjusting the contact area between the feed network disposed in the layer of the conductor cavity and the dielectric element; each dielectric element is integrally formed by injection molding, which enables a broadening of the bandwidth.
Preferably, the dielectric element is fixedly connected with the pull rod in a hot riveting or tight fit mode, and the dielectric element assembly arranged in each layer of conductor cavity comprises a plurality of dielectric elements which are respectively connected with the pull rod arranged in the conductor cavity; the pull rod is a glass fiber reinforced plastic pull rod. The upper dielectric member assembly includes two long dielectric members 301. Both the dielectric element and the anchor are provided with elongated slots.
Preferably, each feeding network is fixedly connected to the insulating member (the insulating member also serving to insulate the feeding network from the conductor cavity), preferably by means of an insulating dielectric rod passing through the insulating member and the feeding network. Fig. 4-1 shows a schematic diagram of a spatial phase shifter structure according to the present application, in which an upper feeding network, a lower feeding network, an upper dielectric element assembly 310, a lower dielectric element assembly 320, and two transmission lines 210 are contained in a conductor housing.
The insulating medium substrates 404 and 403 arranged above and below the upper layer feed network are made of plastic foaming materials, and the upper layer feed network and the insulating medium substrates 404 and 403 are fixedly connected through at least one insulating medium rod (a rod body made of insulating materials) penetrating through the upper layer feed network and the insulating medium substrates 404 and 403. The insulating dielectric substrates 404, 403 may be provided with bosses 411, each boss 411 is provided with a positioning hole 412, each boss 411 is clamped in one opening, the boss 411 is matched with the conductor housing 100 to fix the upper feeding network, a through hole is provided near each port of the upper feeding network, each insulating dielectric rod 405 passes through one positioning hole and one through hole provided under (preferably right under) the positioning hole to position and fix the upper feeding network and the insulating dielectric substrates 404, 403 to each other, and then the insulating dielectric rods 405 are tightly connected with the insulating dielectric substrates 404, the insulating dielectric substrates 403, and the upper feeding network respectively through a thermoplastic riveting process, thereby tightly fixing the insulating dielectric substrates 404, 403, and the upper feeding network together, i.e. two four-port networks 410 are respectively connected with the insulating dielectric substrates 404, 403, and the upper feeding network, 403 are fixedly connected and the insulating dielectric rod 405 may be a plastic rod.
The lower feed network comprises a three-port feed network, and the three-port feed network 420 and the dielectric substrates 401 and 402 are fixedly connected by at least one dielectric rod passing through the three-port feed network 420 and the dielectric substrates 401 and 402. It can be that the insulating dielectric substrate 401 and the insulating dielectric substrate 402 are provided with bosses 411, each boss 411 is provided with a positioning hole 412, each boss 411 is clamped in an opening of the lower conductor cavity, the boss 411 and the conductor housing 100 are mutually matched to play a role of fixing the lower feeding network, a through hole is arranged near each port of the lower feeding network, each insulating dielectric rod 405 arranged in the lower conductor cavity passes through one positioning hole 412 and one through hole arranged below (preferably right below) the positioning hole 412 to mutually position and fix the three-port feeding network 420 and the insulating dielectric substrates 401 and 402 together, then the insulating dielectric rod 405 is respectively tightly connected with the insulating dielectric substrate 401, the insulating dielectric substrate 402 and the lower feeding network through a thermoplastic riveting process, thereby tightly fixing the insulating dielectric substrate 401, the insulating dielectric substrate 402 and the lower feeding network together, the insulating dielectric rod 405 is made of a plastic rod even though the three-port feed network 420 is fixedly connected to the insulating dielectric substrates 401, 402.
The underlying dielectric element assembly includes an elongated dielectric element 302. The long dielectric element 302 and the feed network form a bi-directional phase shifter, so that the phase shifter element disposed in the lower conductor cavity includes two sub-phase shifters. Transmission line 210 is used to connect upper and lower layer feed networks, such as: a pin 407 of one transmission line 210 is inserted into a hole 409 of a second input port of the upper layer feed network, and a pin 408 of the transmission line is inserted into a hole 406 of a first output port of the lower layer feed network, that is, a second input port and a first output port are connected through one transmission line 210. Similarly, another transmission line 210 is correspondingly connected to the upper and lower feeding networks, so that the second input ports of the two four-port networks of the upper layer are connected to the two first output ports of the lower layer to form an integrated network. The feed network comprises a main input port and six second output ports, the sub phase shifter assembly arranged in the upper layer conductor cavity comprises four sub phase shifters, the sub phase shifter assembly arranged in the lower layer conductor cavity comprises two sub phase shifters, and the spatial three-dimensional phase shifter comprises six sub phase shifters in total.
Preferably, the dielectric constant values of the dielectric element assemblies disposed within each layer of the cavity are set such that the phase of the feed network disposed within each layer of the cavity can be varied synchronously when the dielectric element assemblies disposed within each layer of the conductor cavity are moved synchronously. The anchor 211 located in the upper conductor cavity and the anchor 211 located in the lower conductor cavity are connected by a first connection, which may be a rod-like member. The dielectric element assembly disposed in the upper conductor cavity and the dielectric element assembly disposed in the lower conductor cavity can be moved synchronously back and forth by applying a back and forth force to the rod-shaped member or the anchor 211. Therefore, only one transmission device is needed to realize the synchronous movement of the upper dielectric element component and the lower dielectric element component, so that the phases of the sub phase shifter components arranged in each layer of conductor cavity are synchronously changed, and a transmission system is greatly simplified. Six second output terminals may be connected to six antenna elements.
Preferably, each dielectric element in each conductor cavity is made of the same dielectric material and has the same dielectric constant, the dielectric constant of the dielectric element assembly in the upper conductor cavity is between 2.0 and 2.8 (for example, polypropylene or polystyrene-based plastic or polytetrafluoroethylene or TPX (poly 4-methylpentene-1) or PPE), the dielectric element assembly in the lower conductor cavity is made of a material having a dielectric constant between 3.0 and 5.0 (for example, ceramic material, modified PPE material), the dielectric constants of the dielectric element materials in different conductor cavity layers are different, having a difference delta in dielectric constant between them, which, when the dielectric element assemblies provided in the conductor cavities of the respective layers are moved synchronously, the phase of the feed network arranged in each layer of conductor cavity can be synchronously changed, and the transmission system of the electrically-tuned antenna is simplified.
Preferably, the dielectric element assembly arranged in each layer of the conductor cavity is arranged on the left side of the feed network assembly, and the insulating medium substrate and the dielectric element assembly arranged in each layer of the conductor cavity are arranged in the left conductor cavity.
Preferably, a part of the feed network arranged in any one of the conductor cavities extends into the insulating medium substrate, and the other part of the feed network is exposed out of the insulating medium substrate.
Preferably, the dielectric element assembly arranged in each layer of the conductor cavity is arranged on the left side of the feed network, the insulating medium substrate and the dielectric element assembly arranged in each layer of the conductor cavity are arranged in the left conductor cavity, and the pull rod, the dielectric element assembly and the insulating medium substrate arranged in the layer of the conductor cavity are sequentially arranged from left to right on the leftmost side.
Preferably, the insulating dielectric substrate is made of a low dielectric constant, low loss material. The low dielectric constant, low loss material may be, for example, one or more of polypropylene (PP), Polyethylene (PE), Polytetrafluoroethylene (PTFE), TPX (poly 4-methylpentene-1). Thereby improving the gain of the antenna.
Preferably, the insulating dielectric substrate is made of a foamed material. The adoption of the foaming material is convenient for transportation and can also improve the gain of the antenna.
Preferably, each layer of conductor cavity is a cuboid-shaped conductor cavity with cavities arranged at two ends, the four-port networks are sequentially arranged from front to back, and the pull rod and the guide boss are parallel to the long edge of the cuboid-shaped conductor cavity. Of course, the ports of the feed network arranged in the lower cavity are also arranged from front to back in sequence, and preferably, the first input port is arranged in the middle of each second input port, so that the arrangement of the strip lines of the feed network component is facilitated, and raw materials can be saved. Of course, the first output port and the second input port connected by one transmission line 210 are preferably in close proximity for ease of installation. The pull rod 213 is parallel to the guide boss 117, thereby allowing the dielectric substrate to move back and forth relative to the feed network assembly.
Preferably, the insulating dielectric substrate and the conductor housing are fixedly connected by means of rivets. For example by means of a rivet connection through the insulating dielectric substrate and the conductor housing.
During installation, the feed network components can be installed firstly, then each feed network component is inserted into the cavity from the cavity opening of the cavity layer, each first output port is connected with each second input port through a transmission line, and finally the insulating medium substrate is fixedly connected with the conductor shell 100 through rivets, so that the installation is very convenient, the installation can be completed within 10 minutes, and the production efficiency is greatly improved. Two cavity openings are arranged, so that raw materials are saved.
Or the feed network component can be inserted into the left cavity from the opening of the left cavity of each layer of cavity, then the feed network component is moved rightwards, so that each port penetrates through the opening and extends into the right cavity of the layer of cavity, the boss 411 is clamped in the opening, then the insulating medium substrate is fixedly connected with the conductor shell 100 through a rivet, and finally each first output port is connected with each second input port through a transmission line.
Preferably, the positions of the upper and lower feeding network components can be exchanged.
In summary, the feed network is divided into an upper layer and a lower layer, the upper layer and the lower layer are combined into a whole through the transmission line, and then a space three-dimensional phase shifter is formed.
When the phase shifter is used for an antenna, signals are input into each first output port from a first input port, the signals transmitted from each first output port are transmitted to a second input port connected with the transmission line through the transmission line connected with the first output port, then the signals are respectively transmitted to three second output ports which belong to a four-port feed network with the second input port, and then the signals are transmitted to an antenna oscillator connected with each second output port.
Example 2
The invention also provides a spatial stereo phase shifter component applied to the base station antenna, which comprises two spatial stereo phase shifter components which are mutually connected and are arranged in a left-right mirror image manner in the embodiment 1. The phase shifter is composed of a left space stereo phase shifter 523 and a right space stereo phase shifter 524 arranged on the right side of the left space stereo phase shifter, wherein the left space stereo phase shifter 523 and the right space stereo phase shifter 524 are flush with each other in front, back, up and down.
Preferably, the conductor housings of the two spatial phase shifters are integrally formed and connected to form the housing 521 of the phase shifter assembly.
Preferably, the phase shifter assembly further includes second connection parts 525 fixedly connected to anchors at upper portions of the two spatial phase shifters, respectively. The second connecting portion 525 may be disposed on the conductor housing 521, and the second connecting portion 525 is a dragging plate or a dragging rod. The housing 521 may be provided with a guide groove 528, the second connecting portion 525 may be provided with a guide protrusion matching with the guide groove 528, the guide protrusion is disposed in the guide groove 528, and when a forward or backward force is applied to the second connecting portion 525, the second connecting portion 525 can move back and forth along the guide groove 528, and of course, the guide groove, the pull rod, and the guide protrusion are preferably disposed in parallel. The pull rod is preferably parallel to the elongated slots of the dielectric elements of the dielectric element assembly to facilitate pulling.
Fig. 5-1 and 5-2 show structural schematic diagrams of the phase shifter of the present application, which includes an integrally formed conductor housing 521, and 8 conductor cavities 501, 502, 504, 505, 507, 508, 509, and 510 are disposed in the conductor housing 521, where the conductor cavities 501 and 510 disposed on the left side form a pair, the conductor cavity 501 and the conductor cavity 502 together form a lower conductor cavity of a left spatial stereo phase shifter, and the conductor cavity 510 and the conductor cavity 509 together form an upper conductor cavity of the left spatial stereo phase shifter; the conductor cavity 504 and the conductor cavity 505 jointly form a lower conductor cavity of the right spatial stereo phase shifter, and the conductor cavity 508 and the conductor cavity 507 jointly form an upper conductor cavity of the right spatial stereo phase shifter; the feed network placed in the left spatial phase shifter and the feed network placed in the right spatial phase shifter are separated by the longitudinal metal wall 503, the design effectively improves the isolation degree of the system, and the upper layer feed network component and the lower layer feed network component are separated by the transverse metal wall 506. The small windows 511,515 and 517 are three windows disposed right above one four-port network of the left spatial stereo phase shifter, the windows 512,516 and 518 are three windows disposed right above one four-port network of the right spatial stereo phase shifter, and the left and right sides of the phase shifter are respectively provided with six output ports. The insulating dielectric substrate provided in the upper conductor cavity can be fixed to the case by an explosive rivet inserted through a hole in the fixing hole, and the lower insulating dielectric substrate can be fixed to the metal case 521 by the same method. The long window 513 and the long window 514 are respectively second windows of the left space stereo phase shifter and the right space stereo phase shifter, the window 519 and the window 520 are respectively windows a of the left space stereo phase shifter and the right space stereo phase shifter, the main input port is located in the middle of the upper portion of the housing, the push-pull planker can slide back and forth along the elongated strip-shaped window 526,527 and the guide groove 528, and then the dielectric element assembly arranged in each conductor cavity is driven to slide back and forth relative to the feed network arranged in the conductor cavity, the contact area of the dielectric element assembly and the feed network is changed, and the beam direction is adjusted.
The metal shell 521 is provided with a round hole, the insulating medium substrate is provided with a fixing hole corresponding to the round hole, and the insulating medium substrate and the conductor shell are fixed together by an explosion rivet penetrating through the round hole and the fixing hole. The round hole can be a plurality of, and the fixing hole corresponding to each round hole also can be a plurality of.
In summary, the phase shifter feed networks are respectively arranged in the two metal conductor cavities, the two feed networks are connected into a whole through the transmission lines, and then the dielectric elements with different dielectric constants are used in different conductor cavity layers, so that the upper and lower dielectric element assemblies can be dragged to move together by using one set of transmission system, and the transmission system is simplified, otherwise, the upper and lower dielectric elements are respectively driven by using two sets of transmission systems.
Therefore, the phase shifter is expanded to a three-dimensional structure to form a space three-dimensional phase shifter, the width of the original plane phase shifter can be reduced by 50%, and as a result, the invention enables us to design electrically tunable antennas with smaller size, the antennas do not use cables, and if the antenna has M radiators, the beam forming network has M-1 sub phase shifters, so that the we can design an antenna directional pattern with high quality.
And a second output port of the left space stereo phase shifter and a second output port of the right space stereo phase shifter are respectively connected with an antenna oscillator.
The housing and the casing preferably do not have openings except for the openings to prevent electromagnetic waves from leaking. It is also preferable that the transverse metal walls 506 and the longitudinal metal walls 503 are not provided with openings to prevent electromagnetic waves from leaking.
Fig. 5-3 and 5-4 are vertical plane patterns of the present invention when electrically downtilt 0 degrees and 20 degrees, respectively, when applied to a base station antenna.
The phase shifter is suitable for all frequency bands, and is particularly suitable for fourth generation mobile base station antennas in 610-.
The conductor can be made of metal aluminum, aluminum alloy and other materials. Plural means two or more.
In addition, it should be noted that the upper and lower layer feed networks of the phase shifter are only opposite, and actually, the upper and lower layer feed networks may be exchanged, and of course, the upper and lower layer feed networks of each phase shifter constituting the phase shifter assembly are also opposite, that is, the upper and lower layer feed networks of each phase shifter constituting the phase shifter assembly may also be exchanged.
However, the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, which is intended to cover all the modifications and equivalents of the claims and the specification. In addition, the abstract and the title are provided to assist the patent document searching and are not intended to limit the scope of the invention.
Claims (8)
1. A space three-dimensional phase shifter applied to a base station antenna is characterized by comprising a conductor shell internally provided with an upper layer of conductor cavity and a lower layer of conductor cavity and a feed network component arranged in each layer of conductor cavity, wherein a lower layer feed network arranged on the lower layer feed network component comprises a first input port and two first output ports; the upper layer feed network arranged on the upper layer feed network component comprises two four-port networks, and each four-port network comprises three second output ports and a second input port connected with one first output port through a transmission line; the four-port network is a metal conductor strip line provided with a slow wave line or a microstrip line printed circuit board provided with a slow wave line; two ends of each layer of conductor cavity are provided with cavity openings for the feed network components to move in or out; the feed network component comprises a sub phase shifter component used for adjusting the beam direction of the base station antenna and an insulating component used for supporting the sub phase shifter component, and the sub phase shifter component comprises a feed network connected with the transmission line and a dielectric element component connected with the feed network in a sliding mode;
the lower layer feed network is a metal conductor strip line or a printed circuit board provided with a microstrip line
The top of the conductor shell is provided with a window communicated with the upper-layer conductor cavity, the window comprises a window A and two windows B, and each window B comprises a first window arranged right above each second output port of a four-port network and a second window arranged right above a second input port of the four-port network; the second window of each window B is also arranged right above a transmission line connected with the second input port of the four-port network and a first output port connected with the transmission line;
each first output port is connected with one second input port through one transmission line; the projections of a first output port and a second input port which are connected through a transmission line in the horizontal direction are staggered; the transmission line is arranged in the conductor shell;
the phase shifter can be applied to 610-960MHz, 1420-2690MHz and 3300-3900MHz multi-frequency base station antennas.
2. The spatial phase shifter of claim 1, wherein each layer of conductor cavity is integrally formed, and the conductor housing is formed by stacking and combining a plurality of layers of conductor cavities or integrally formed by metal conductor profiles.
3. The spatial phase shifter according to claim 1, wherein the insulating member is an insulating dielectric substrate, the insulating dielectric substrate disposed in each layer of the conductor cavity is composed of an insulating dielectric substrate a and an insulating dielectric substrate B disposed in the layer of the conductor cavity, and the insulating dielectric substrate a and the insulating dielectric substrate B disposed in the layer of the conductor cavity are disposed above and below the feeding network disposed in the layer of the conductor cavity, respectively.
4. The spatial phase shifter of claim 3, wherein the dielectric substrate is made of one or more materials selected from the group consisting of polypropylene, polyethylene, polytetrafluoroethylene, and poly-4-methylpentene-1.
5. A spatial phase shifter according to claim 3 wherein the dielectric substrate is made of a foam material.
6. The spatial phase shifter of claim 1, wherein the conductor housing further comprises a conductor partition plate having openings disposed in each of the conductor cavities, the conductor partition plate comprising an upper conductor partition plate disposed in the upper conductor cavity and a lower conductor partition plate disposed in the lower conductor cavity, the lower conductor partition plate having a first opening and two second openings, the upper conductor partition plate having six third openings and two fourth openings.
7. The phase shifter according to claim 1, wherein the upper and lower feeding network components are interchangeable.
8. A phase shifter assembly for a base station antenna, comprising two of said spatial phase shifters according to any of claims 1-7 connected to each other, and arranged in mirror image left and right.
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| CN107181062A (en) * | 2017-04-28 | 2017-09-19 | 广州司南天线设计研究所有限公司 | A kind of space multistory phase shifter and phase shifter package for antenna for base station |
| CN107819198B (en) * | 2017-09-19 | 2020-03-20 | 上海华为技术有限公司 | Feed network of base station antenna, base station antenna and base station |
| CN108232379A (en) * | 2017-12-29 | 2018-06-29 | 京信通信系统（中国）有限公司 | Phase-shift structure and antenna |
| CN107968239A (en) * | 2017-12-29 | 2018-04-27 | 京信通信系统（中国）有限公司 | Phase-shift structure and antenna |
| CN108511903B (en) * | 2018-03-09 | 2020-04-17 | 中天宽带技术有限公司 | Dielectric phase shifter-based horizontal main lobe width-adjustable spotlight antenna |
| CN112993569B (en) * | 2019-12-18 | 2022-08-26 | 京信通信技术(广州)有限公司 | Feed network and antenna |
| CN111063970A (en) * | 2019-12-27 | 2020-04-24 | 华南理工大学 | Microwave device and antenna |
| CN114976647A (en) * | 2022-05-09 | 2022-08-30 | 南通大学 | Dielectric phase shifter for base station array antenna |
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| CN202871945U (en) * | 2012-09-12 | 2013-04-10 | 苏州市大富通信技术有限公司 | A phase shifter and an electrical tilt antenna |
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