CN109755696A - A kind of wideband cavity phase shifter - Google Patents
A kind of wideband cavity phase shifter Download PDFInfo
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- CN109755696A CN109755696A CN201910144603.1A CN201910144603A CN109755696A CN 109755696 A CN109755696 A CN 109755696A CN 201910144603 A CN201910144603 A CN 201910144603A CN 109755696 A CN109755696 A CN 109755696A
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 35
- 239000002184 metal Substances 0.000 claims abstract description 35
- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 230000010363 phase shift Effects 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims abstract description 3
- 238000002955 isolation Methods 0.000 claims abstract description 3
- 238000001465 metallisation Methods 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 9
- 238000010295 mobile communication Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
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- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
Abstract
The present invention relates to antenna of mobile communication base station fields, disclose a kind of antenna for base station wideband cavity phase shifter, including metal cavity, pull rod, end cap, coaxial feeder, PCB circuit board and upper layer and lower layer slide dielectric-slab；The first plated-through hole of the TN knot transmission line for electrical communication PCB circuit media plate two sides same position and the second plated-through hole for two TN adjacent on PCB circuit media plate knot transmission line to be carried out to electrical isolation are machined on the PCB circuit media plate, the TN knot transmission line is covered on first plated-through hole, and second plated-through hole is located between adjacent two TN knot transmission line.The advantages that phase shifter proposed by the present invention has stable structure, and intermodulation is functional, and bandwidth of operation is wider, and dynamic power is stablized in dephasing processes, and the amount of phase shift linearity is high.
Description
Technical field
The present invention relates to the cavity phase shifts of antenna of mobile communication base station technical field more particularly to a kind of electric tuning antenna of base station
Device.
Background technique
In mobile communications network covering, electric tuning antenna of base station has gradually replaced traditional machine because of its good electric property
Tool has a down dip antenna.Phase shifter adjusts the significant components of antenna for base station that can pass through the amplitude between control base station bay as electricity
The beam scanning of directional diagram is realized with phase.Therefore the superiority and inferiority of phase shifter performance directly affects the electric tonality energy of antenna for base station.
In the design of cavity phase shifter, slide dielectric-slab impedance matching be determine phase shifter bandwidth of operation it is important because
Element, therefore the design for sliding dielectric-slab impedance matching portion is most important.In order to guarantee that sliding dielectric-slab is intracorporal in wire chamber
Sliding, between PCB circuit board and sliding dielectric-slab, gap can be had by sliding between dielectric-slab and metal cavity, slide dielectric-slab
Deformation and shaking in sliding process will have a direct impact on the intermodulation and electric property of cavity phase shifter.In order to realize biggish shifting
The TN knot transmission line of Xiang Liang, PCB circuit board have multichannel bending, and the mutual coupling between transmission line can seriously affect phase shifter transposition amount
The linearity and sliding process in each port power large change.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiency of the prior art, and propose a kind of there is knot
Structure is stablized, and intermodulation is functional, and bandwidth of operation is wider (meeting GSM900 frequency range), and dynamic power is stablized in dephasing processes, phase shift
Measure the high phase shifter of the linearity.
To solve the above problems, the technical solution adopted by the present invention is that:
A kind of antenna for base station wideband cavity phase shifter, including metal cavity, pull rod, end cap, coaxial feeder, PCB circuit board
And upper layer and lower layer slide dielectric-slab；Two ends of the wire chamber are arranged in the end cap；The upper layer and lower layer slide medium
Plate is located at the upper and lower surface of the PCB circuit board；One end of the pull rod is placed in outside the metal cavity, the pull rod it is another
One end is connect with upper layer and lower layer sliding dielectric-slab, and upper layer and lower layer sliding dielectric-slab is stated under the pulling of the pull rod with described
PCB circuit board generates relative displacement；The coaxial feeder and the PCB circuit board are electrically connected；The sliding dielectric-slab includes
Slide dielectric-slab phase shifting part and impedance matching portion, the PCB circuit board includes PCB circuit media plate and is attached to dielectric-slab
On TN tie transmission line；It is characterized by: being machined on the PCB circuit media plate for electrical communication PCB circuit media
The TN of plate two sides same position ties the first plated-through hole of transmission line and passes for tying two TN adjacent on PCB circuit media plate
Defeated line carries out the second plated-through hole of electrical isolation, and the TN knot transmission line is covered on first plated-through hole, institute
The second plated-through hole is stated to be located between adjacent two TN knot transmission line.
PCB circuit board includes being equipped with the PCB circuit board medium of Dense metal via hole and being attached on circuit board medium
Lower two sides are simultaneously metallized the TN knot circuit that via hole connects.It is 6mm length is 3mm's that TN, which is tied in circuit comprising 6 width,
Pad, TN knot circuit surface are externally provided with non-conductive layer except pad.Institute's hole-opening is one by one above non-conductive layer pad and metal cavity
It is corresponding.On the PCB circuit media plate upper layer and lower layer TN knot circuited transmission between and same layer TN knot circuited transmission it
Between be equipped with metallization VIA.The PCB circuit board medium upper left corner cuts elongated cuboid, and does chamfered in end.
Further, the present invention devises the sliding dielectric-slab of a impedance matching portion with exponential fade characteristic.
The sliding dielectric-slab is divided into two up and down, and upper and lower two dielectric-slabs are identical, and with axis where metal cavity center
Relationship in a center of symmetry.The sliding dielectric-slab includes sliding dielectric-slab phase shifting part, is placed in sliding dielectric-slab phase shifting part two
The impedance matching portion of side, hole, the card slot to match with hole, the card slot to match with pull rod, elastic, impedance match portion
It is arranged with cuboid supporting element.Sliding dielectric-slab main body is divided into front and back two parts of different-thickness.Impedance matching in the present invention
Part is made of the medium and cuboid supporting element of exponential fade.Between PCB dielectric-slab and sliding dielectric-slab, dielectric-slab is slided
There is the gap of 0.15mm between metal cavity.
Detailed description of the invention
Illustrate the specific embodiment of the invention or technical solution in the prior art in order to clearer, it below will be to specific
Embodiment or attached drawing needed to be used in the description of the prior art do simple introduction, it should be apparent that, be described below in it is attached
Figure is some embodiments of the present invention, and those of ordinary skill in the art are seen, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is cavity phase shifter structural schematic diagram of the present invention；
Fig. 2 is phase shifter end cover structure schematic diagram of the present invention；
Fig. 3 is PCB circuit board of the present invention and coaxial feed assembly structure diagram；
Fig. 4 is that TN ties transmission line and PCB circuit media plate fractionation structural representation in PCB circuit board of the present invention；
Fig. 5 is that exponential fade type of the present invention slides dielectric-slab structural schematic diagram；
Fig. 6 is graded index type of the present invention and stepped impedance matching schematic diagram；
Fig. 7 is phase shifter simulation result diagram of the present invention；
Wherein: 1, metal cavity, 11, hole, 12, metal bosses, 14, hole, 2, pull rod, 3, end cap, 31, cuboid
Column, 32, cylinder, 4, coaxial feeder, 5, PCB circuit board, 51, TN knot circuit, 511, pad, 512, non-conductive layer, 52, PCB electricity
Road plate medium, 521, metallization VIA, 522, cuboid, 6, sliding dielectric-slab, 61, phase shifting part, 62, impedance matching portion,
621, cuboid supporting element, 63, hole.64, card slot, 65, card slot, 66, elastic,
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
With reference to Fig. 1, cavity phase shifter proposed by the invention, including metal cavity 1, pull rod 2, end cap 3, coaxial feeder 4,
PCB circuit board 5 and upper layer and lower layer slide dielectric-slab 6.Upper layer and lower layer sliding dielectric-slab 6 is placed in 5 positive and negative two tables of PCB circuit board
Face, sliding 6 connecting rod 2 of dielectric-slab are placed in metal cavity 1, and end cap 3 is placed in the opening of metal cavity 1 both ends.
Metal cavity 1 is aluminum material, and structure is four face closure both ends opens, and both ends are equipped with and match with end cap 3
Hole 11, have metal bosses 12 in front of side rear and side, and metal bosses are divided into three parts by partition two-by-two, in front of side and side
The blocking position 13 at rear is identical, and the suitable fastener of part installation dimension separated two-by-two is fixed on convenient for this phase shifter
On antenna array.The upper surface of metal cavity is opened there are six hole 14, and the effect of this hole is convenient for PCB circuit board 5 and coaxial feed
The welding of electricity 4.12 metal cavity 1 of metal bosses is integrally formed.
With reference to Fig. 2, the outer end face of two rectangular scapus 31 of one layer of protrusion is contacted with PCB circuit board 5 among end cap 3, can
To fix PCB circuit board 5 when in cavity, ensure that sliding dielectric-slab 6 slides in metal cavity 1, PCB circuit board 5 will not
Deformation occurs and shakes, and then influences intermodulation and electrical characteristic, ensure that the stability of cavity phase shifter.Two above and below in end cap 3
The cylinder 32 of end protrusion is embedded in the hole 11 in metal cavity 1, and in cavity phase shifter welding process, PCB circuit board 5 can occur
Double swerve causes the inconsistency of phase shifter, first installs end cap in welding, can fix PCB circuit board 5, guarantees phase shift
The consistency of device.End cap 3 will not influence the electric property of cavity phase shifter.Therefore the material of end cap 3 is common PC, and price is low
It is honest and clean.
With reference to Fig. 3, Fig. 4, PCB circuit board 5 includes being equipped with PCB circuit board medium 52 and the attachment of Dense metal via hole
Two sides are descended on circuit boards and are metallized the TN knot circuit 51 that via hole connects, and it includes 5 parallel width that TN, which ties circuit 51,
Identical transmission line is spent, and connects the matched line of this five transmission lines.Wherein this five transmission lines can be such that the port is moving
Dynamic one times of amount of phase shift apart from when realize 5 times of phase shift, the matched line for connecting this five transmission lines may be implemented different wave beams and assign
Shape.It comprising 6 width is pad 511 that 6mm length is 3mm in TN knot circuit, knot 51 surface of circuit TN is externally provided with except pad 511
Non-conductive layer 512.The effect of non-conductive layer 512 be protect TN knot circuit 51 when in use between it is longer after abrasion and oxidation,
Pad 511 does not set non-conductive layer for the convenience of welding.Institute's hole-opening 14 corresponds above for pad 511 and metal cavity 1.
There is intensive metallization VIA 521 in PCB circuit board medium 52, wherein metallization VIA 521 includes two parts, and a part is company
The metallization VIA of upper layer and lower layer TN knot circuit 51 is connect, it acts as electrical short upper and lower level TN to tie circuit；Another part is TN
Tie the metallization VIA between 51 metal wire of circuit, effect be prevent the metal wire in TN knot circuit 51 be separated by it is too close caused by
Mutual coupling causes the electric property of phase shifter to decline.52 upper left corner of PCB circuit board medium cuts elongated cuboid 522, guarantees to draw
Bar 2 is connect with PCB circuit board 5.PCB circuit board medium 52 is provided with four rectangle holes 524, and does chamfered in end.
With reference to Fig. 5, Fig. 6, sliding dielectric-slab 6 to be divided to is upper and lower two, and upper and lower two dielectric-slabs are identical, and with gold
Axis relationship in a center of symmetry where belonging to 1 center of cavity.Sliding dielectric-slab 6 includes sliding dielectric-slab phase shifting part 61, is placed in sliding
The impedance matching portion 62 of dielectric-slab phase shifting part two sides, hole 63, the card slot 64 to match with hole 63 match with pull rod
Card slot 65 and elastic 68.Sliding dielectric-slab 6 divides front and back two parts 66 and 67 for different-thickness, it is assumed that sliding dielectric-slab
66 parts are corresponding with a thickness of h, effective dielectric constant ε, and phase-shift phase isSlide 67 part of dielectric-slab it is corresponding with a thickness of
h1, effective dielectric constant ε1, phase-shift phase isIt meetsWhen port 41,42,43,44,45 connects
Bay when equidistantly arranging, with reference to Fig. 3, the corresponding three phase-shifted transmission lines in port 44, corresponding five transmission lines in port 45,
In order to realize that the travel(l)ing phase of port 45,44,43,42,41 is the φ of -2 φ,-φ, 0, φ, 2, thenCause
This h=5/6h1, in order to consider the needs of actual performance index, when the antenna being connected with each port is unequal spacing arrangement, only need
The thickness that sliding dielectric-slab is adjusted according to above-mentioned formula, can be realized the phase distribution of each port.Impedance matching portion 62 is
Identical impedance is kept in order to guarantee to slide five ribbon feeders of the dielectric-slab 6 in moving process in PCB circuit board 5, because
The size and structure of this impedance matching portion directly determine the port identity of cavity phase shifter.This structure is being slided than conventional
Cuboid hole is opened up on dielectric-slab 6 with broader bandwidth.To slide thickness thinnest part in dielectric-slab impedance transformation part 62
For origin, it is assumed that sliding dielectric-slab thinnest part with a thickness of h, thickness ht, the corresponding wave of centre frequency of phase shifter work
A length of λ, then its curve meetsAccording to design experiences, ht=6hfWhen, phase shifter has preferable
Matching properties.As shown in fig. 6, Z0The aerial impedance of circuit 51, Z are tied for TNLCircuit 51 is tied by sliding dielectric-slab 6 for TN
The impedance of 61 covering part of phase shifting part, Z (z) are covered by TN knot circuit 51 by 6 middle impedance compatible portion 62 of sliding dielectric-slab
Impedance, when impedance matching portion 62 using hollow out certain length sliding dielectric-slab 6 or impedance matching portion 62 use ladder
When type changes, impedance Z+ Δ Z corresponding when being covered by TN node road 51 by it.When carrying out impedance matching, when discrete section
When number N increases, the Spline smoothing of the characteristic impedance between each section becomes smaller therewith.So exponential type grading structure is equivalent in nothing
Under the limiting case for limiting multiple sections, characteristic is approximately the impedance transmission lines of a gradual change.In order to guarantee electric property, impedance
With 62 close to pull rod 2 one end thickness be less than 1mm, this make slide dielectric-slab 61 sliding process middle impedance of metal cavity match
62 parts can deformation occurs and wobble effects electric property and intermodulation index.Therefore cuboid supporting element 621 is designed in the present invention
Guarantee the structural stability of dielectric-slab impedance matching portion 62.It slides the card slot 64 in dielectric-slab 6 and passes through PCB circuit board 5 in upper layer
In rectangle hole 524 be embedded in the hole 63 in lower layer's sliding dielectric-slab 6, complete sliding dielectric-slab 6 and PCB circuit board 5
Assembling.The card slot 65 to match with pull rod 2 in sliding dielectric-slab 6, which is embedded in pull rod 2, completes sliding dielectric-slab 6 and pull rod 2
Assembling.Sliding dielectric-slab 6 on be arranged elastic 66, make PCB dielectric-slab 5 and sliding dielectric-slab 6 between, sliding dielectric-slab 6 with
There are the gap of 0.15mm, extrusion deformation of the anti-sliding stop dielectric-slab 6 in sliding process between metal cavity 1, it is ensured that
Cavity phase shifter has good intermodulation characteristic in vibration and sliding process.
It is standing wave (VSWR) simulation result diagram of phase shifter in GSM900 frequency range with reference to Fig. 7, Fig. 7, simulation calculation shows: this
The phase shifter proposed is invented in GSM900 (806MHz-960MHz) standing wave less than 1.25, meets design requirement.
In conclusion the present invention devise it is a have the matched sliding dielectric-slab of exponential fade characteristic impedance to realize more
Wide bandwidth, and design cuboid supporting element guarantees that the structural stability of sliding dielectric-slab and intermodulation are special on sliding dielectric-slab
Property.Further, present invention design metallization VIA between the TN knot transmission line of PCB circuit board reduces between TN knot transmission line
Mutual coupling.Further, the present invention devises a plastic card, guarantees the structural stability and phase shifter of PCB circuit board
Intermodulation characteristic.
Finally it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；
Although present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that；Its
It is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features
It is replaced on an equal basis；And these modifications or substitutions, so that corresponding technical solution essence is detached from various embodiments of the present invention technical side
Case scope.
Claims (10)
1. a kind of antenna for base station wideband cavity phase shifter, including metal cavity, pull rod, end cap, coaxial feeder, PCB circuit board and
Upper layer and lower layer slide dielectric-slab；Two ends of the wire chamber are arranged in the end cap；The upper layer and lower layer slide dielectric-slab
Positioned at the upper and lower surface of the PCB circuit board；One end of the pull rod is placed in outside the metal cavity, the pull rod it is another
End is connect with upper layer and lower layer sliding dielectric-slab, and upper layer and lower layer sliding dielectric-slab is stated under the pulling of the pull rod with described
PCB circuit board generates relative displacement；The coaxial feeder and the PCB circuit board are electrically connected；The sliding dielectric-slab includes
Slide dielectric-slab phase shifting part and impedance matching portion, the PCB circuit board includes PCB circuit media plate and is attached to dielectric-slab
On TN tie transmission line；It is characterized by: being machined on the PCB circuit media plate for electrical communication PCB circuit media
The TN of plate two sides same position ties the first plated-through hole of transmission line and passes for tying two TN adjacent on PCB circuit media plate
Defeated line carries out the second plated-through hole of electrical isolation, and the TN knot transmission line is covered on first plated-through hole, institute
It states the second metallization and is tied between transmission line by being located at adjacent two TN.
2. antenna for base station wideband cavity phase shifter according to claim 1, it is characterised in that: the shifting of the sliding dielectric-slab
Mutually part is made of on the direction of vertical sliding motion the first part of different-thickness and second part, and the thickness of two parts is full
Foot:
In formula, h, ε andThe thickness, effective dielectric constant of respectively first part is and phase-shift phase；h1、ε1AndRespectively second
Partial thickness, effective dielectric constant are and phase-shift phase.
3. antenna for base station wideband cavity phase shifter according to claim 2, it is characterised in that: the resistance of the sliding dielectric-slab
Anti- compatible portion uses the matching slot extended along the sliding dielectric-slab glide direction, which meets:
In formula, y is the thickness that impedance matching portion slides dielectric-slab, hfThe thickness of dielectric-slab thinnest part is slided for impedance matching portion
Degree, htThe thickness in dielectric-slab thickness is slided for impedance matching portion, λ is the corresponding wavelength of centre frequency of phase shifter work.
4. antenna for base station wideband cavity phase shifter according to claim 1 to 3, it is characterised in that: the sliding medium
Plate is fixed on PCB circuit board two sides by dielectric-slab card slot and hole；The PCB circuit media plate is equipped with cuboid sliding slot；
The dielectric-slab card slot of the sliding dielectric-slab is located in the cuboid sliding slot；Dielectric-slab is slided by matching with pull rod card slot
Hole connect and be placed in metal cavity with pull rod.
5. antenna for base station wideband cavity phase shifter according to claim 4, it is characterised in that: the shifting of the sliding dielectric-slab
Mutually part is equipped with elastic.
6. antenna for base station wideband cavity phase shifter according to claim 5, it is characterised in that: the end cap by with metal
The cavity hole end cap card slot that matches is fixed on metal cavity both ends.
7. antenna for base station wideband cavity phase shifter according to claim 6, it is characterised in that: set between adjacent two matching slot
There is cuboid supporting element, and cuboid supporting element and sliding dielectric-slab are integrally formed；Pass through the rectangular of protrusion among the end cap
Body supporting element is contacted with PCB circuit board, and two sides are equipped with the cylindrical body to match with metal cavity to the end cap up and down.
8. antenna for base station wideband cavity phase shifter according to claim 4, it is characterised in that: the PCB circuit board TN knot
Except pad locations are externally provided with non-conductive layer on transmission line.
9. antenna for base station wideband cavity phase shifter according to claim 4, it is characterised in that: set in the PCB circuit board
One is equipped with for placing the elongated cuboid gap of pull rod.
10. antenna for base station wideband cavity phase shifter according to claim 4, it is characterised in that: behind the wire chamber side
There are metal bosses in front of side and side, and metal bosses are divided into three parts, the blocking position in side front and side rear by partition two-by-two
Identical, the part separated two-by-two can be with the suitable fastener of installation dimension and antenna cascade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910144603.1A CN109755696B (en) | 2019-02-27 | 2019-02-27 | Broadband cavity phase shifter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910144603.1A CN109755696B (en) | 2019-02-27 | 2019-02-27 | Broadband cavity phase shifter |
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| Publication Number | Publication Date |
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| CN109755696A true CN109755696A (en) | 2019-05-14 |
| CN109755696B CN109755696B (en) | 2024-03-19 |
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| CN201910144603.1A Active CN109755696B (en) | 2019-02-27 | 2019-02-27 | Broadband cavity phase shifter |
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Cited By (5)
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| CN111446523A (en) * | 2020-04-30 | 2020-07-24 | 上海安费诺永亿通讯电子有限公司 | High-integration phase shifter |
| CN111585024A (en) * | 2020-05-20 | 2020-08-25 | 武汉虹信通信技术有限责任公司 | Dielectric phase shifter and 5G base station antenna |
| CN111668578A (en) * | 2020-07-06 | 2020-09-15 | 武汉虹信通信技术有限责任公司 | Dielectric phase shifter and base station antenna |
| CN112787053A (en) * | 2021-01-12 | 2021-05-11 | 上海安费诺永亿通讯电子有限公司 | Phase shifter and antenna |
| WO2023154622A1 (en) * | 2022-02-10 | 2023-08-17 | Commscope Technologies Llc | Phase shifter assembly, cavity phase shifter with phase shifter assembly and base station antenna |
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| CN111668578A (en) * | 2020-07-06 | 2020-09-15 | 武汉虹信通信技术有限责任公司 | Dielectric phase shifter and base station antenna |
| CN112787053A (en) * | 2021-01-12 | 2021-05-11 | 上海安费诺永亿通讯电子有限公司 | Phase shifter and antenna |
| WO2023154622A1 (en) * | 2022-02-10 | 2023-08-17 | Commscope Technologies Llc | Phase shifter assembly, cavity phase shifter with phase shifter assembly and base station antenna |
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| CN109755696B (en) | 2024-03-19 |
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