CN1392628A - Continuously adjustable phase shifter - Google Patents
Continuously adjustable phase shifter Download PDFInfo
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- CN1392628A CN1392628A CN 02139334 CN02139334A CN1392628A CN 1392628 A CN1392628 A CN 1392628A CN 02139334 CN02139334 CN 02139334 CN 02139334 A CN02139334 A CN 02139334A CN 1392628 A CN1392628 A CN 1392628A
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Abstract
This invention provides a continuous-adjustable phase shifter containing a dielectric plate, a sliding plate, a coupling plate, a transmission-line board, among which the sliding plate is to form an air microstrip transmission line by two up-and-down strips, the coupling plate is to form a parallel transmission line by two up-and-down symmetrical metal plates and the dielectric plate fixed by a clip block at the outside of the sliding plate by use of the transition meander line microstrip structure connected with metal plate. The transmission line board decomposes the input radiation signal To to at least two routes of output signals and distributes the power at will to connect one of the routes to both ends of the sliding plate, then to send them to each radiation unit respectively after phase shift, and another route is connected directly to the radiation unit.
Description
Technical field:
The present invention relates to a kind of antenna element, a kind of specifically continuous adjustable phase shifter.This continuous adjustable phase shifter is specially adapted to beam scanning, and the array antenna that the secondary lobe shape is changed.
Background technology:
As everyone knows, phase shifter is the critical component that changes array antenna beam scanning.All there is defective in various degree in the phase shifter of employed various structures in the existing antenna array.For example, Chinese patent 96193925.7 shown in Figure 7, the antenna array of forming by three unit.The phase shifter of this antenna array is by the little band plate 16 of medium, medium sliding panel 17, and metal base plate 18 constitutes.Be carved with microstrip line 19 and branch line 20 on the little band plate 16 of medium.When medium sliding panel 17 along A when mobile, the signal transmission rate in the little band curved section that is connected with radiant body c is reduced, the signal transmission rate in the little band curved section that is connected with radiant body a is increased.Cause a phase place leading, c phase lag, the phase difference with respect to the radiating element b of centre is respectively+β that-β realizes beam scanning with this separately.This phaser has the deficiency of following three aspects:
(1) supposes the effective dielectric constant ε of medium sliding panel
r〉=1, establishing airborne wavelength is λ
0, obtain 1,2 output phase and change and be respectively+β, what-β, medium slide block will move apart from S is:
, necessarily require the material of efficient dielectric constant, could realize obtaining certain amount of phase shift β in the limited displacement, and the price of this material is very expensive.
(2) variation of line characteristic impedance can be brought in the medium place of arrival, the corresponding available substantially formula of relation
Describe approx; Z wherein
0Be the characteristic impedance that medium slip does not arrive microstrip transmission line before, Z
gBe the microstrip line characteristic impedance of medium slip after sliding into.Be not difficult to find out ε
rBig more, dieelctric sheet is just big more to the influence of characteristic impedance, makes feeder network middle impedance mismatch just serious more, and nature can bring the increase of reflection and the control breakdown of voltage standing wave ratio;
(3) along with ε
rIncrease, the insertion loss that dieelctric sheet brings also increases rapidly, and high ε
rThe medium of low insertion loss is difficult to obtain, and price is extremely expensive.If use low ε
rMaterial, obtain identical phase shift, it is just very big apart from s that medium block slides, and will inevitably cause the volume of whole phase shifter to increase, this is again a difficult problem for extremely limited space, antenna inside, even and if ε
rLess, the variation of characteristic impedance is still arranged inevitably, cause standing wave to degenerate.Though this technology has adopted again and respectively added a trapezoidal transforming section at the medium slip two ends and solve this problem, be because the length of this trapezoidal transforming section is the shortest
λ
gSo the size of whole phase shifter increases again
λ
gAs seen this phase shifter reduces the wastage reducing volume, avoids mismatch, and several aspects such as reduce cost all exist very big drawback.
It is another variable differential phase shifter of 94193994.4 that Fig. 8 .2 has provided application number.This technology is to be made of two orthogonal coaxial lines, wherein the side arm of the outer conductor of coaxial line 21 has a rectangular slit 22 (not drawing among the figure), the inner wire 24 of coaxial line 23 passes from slit 22, is connected with movable sliding sleeve 26 on the inner wire that is enclosed within coaxial line 21.The outer conductor 25 of coaxial line 23 is connected with movable sliding sleeve 26 on the outer conductor that is enclosed within coaxial line 21, is coupled on the coaxial line 23 by the energy of interior outer sliding sleeve with coaxial line 21, also the energy of coaxial line 23 can be coupled on the coaxial line 21.By the position of outer sliding sleeve in changing, can change the transmission path of output signal of the two-port of coaxial line 21, realize changing the purpose of phase place.The shortcoming of this technology is:
(1) when the big amount of phase shift of needs, the aperture slots 22 of coaxial line 21 certainly will be very long, and to reveal electromagnetic energy be very big in the slit of the outer conductor of coaxial line, if adopt the length of the movable sliding sleeve 26 of lengthening, then this length is 2 times of gap length at least;
(2) the scarce outer conductor in 22 places, slit of coaxial line 21 is substituted by sliding sleeve 26, because the internal diameter of sliding sleeve 26 is bigger than the outer conductor internal diameter of coaxial line 21, the characteristic impedance of place place coaxial line 21 of gapping is bigger than the characteristic impedance that does not have the slit to locate, so impedance does not match;
(3) transformer section of this technology be by
λ
g Coaxial line 23 constitutes, because
λ
gBe and frequency f
0Tightly relevant, when frequency change, the length of coaxial line 23 will no longer be
λ
g, therefore, transformer section just can not be realized the function of impedance conversion well, has the narrower deficiency of impedance bandwidth;
(4) because this technology adopts the "T"-shaped branch of coaxial line, coaxial line 23 can't be split up into multichannel again, so when it will give multiple antenna battle array feed, must adopt the mode of a plurality of phase shifter connection in series-parallel cascades, must cause the phenomenon of the insertion loss series connection superposition of a plurality of phase shifters;
(5) owing to the used interior outer sliding sleeve 26,24 of this technology is not isometric, overcoat couple current imbalance in must causing will cause electric current on the outer conductor outer wall of coaxial line 21, cause energy loss.
Can not realize to many radiating elements phase shift feed with a phase shifter that (6) for example, must three phase shifter connection in series-parallel make up (shown in Fig. 8 .1) to four radiating element phase shift feeds, complex structure uses inconvenience.
The content of invention:
The objective of the invention is to overcome the deficiency of above-mentioned prior art, provide a kind of insertion loss low, phase shift range is big, and the continuous adjustable phase shifter that impedance matching is good is with the antenna array feed of realizing forming for a plurality of radiating elements simultaneously.
Realize that the object of the invention key problem in technology is to have adopted the feeding network that has any distribution power functions concurrently, constitute the multiterminal phase shifter of an end input signal multiterminal output signal.Whole phase shifter comprises slide mechanism, coupling network, matching network three parts, by the path that the control slide mechanism moves continuously, and the phase difference of control output signal component.Wherein, slide mechanism is to constitute an air microstrip transmission line by double layer of metal slide plate 3 up and down; Coupling network supports laterally zygomorphic two sheet metals 8 by medium fixture block 6 and constitutes ribbon feeder, is fixed on the outside of metal slide plate 3; Matching network adopts gradual change meander line structure to form microstrip transmission line plate 4, and is connected with sheet metal 8; Microstrip transmission line plate 4 is with the radiofrequency signal T of input
0Be decomposed into two-way at least, send each radiating element of antenna array respectively to.
Branch's feedback meander line that the main feed meander line 10 that microstrip transmission line plate 4 in the above-mentioned phase shifter, its microstrip line are not waited by a width and many width do not wait constitutes, and the length of each section meander line is half wavelength, to realize good impedance matching.
The microstrip transmission line plate 4 of above-mentioned phase shifter, main feed meander line 10 in its microstrip line is after the process half wavelength, be split up into two transmission lines branches 11 and 12, these two branch lines adopt not wide line to obtain the unequal power distribution at the prong place, with the radiofrequency signal T of input
0Be decomposed into T1 and T2 two-way, wherein one road T1 is coupled to the two ends T3 and the T4 of metal slide plate 3 by coupling piece 8, sends two radiating elements to, and another road T2 directly is connected with coaxial line and sends another radiating element to.T3, the phase place of T4 output signal is with respect to input signal T
0Phase place can change continuously, and the phase place of T2 output signal is with respect to input signal T
0Constant phase difference is arranged, form the three-element antenna array.
Above-mentioned phase shifter is if with the two ends output T3 of metal slide plate 3 and three ports of T2 of T4 and 4 outputs of microstrip transmission line plate, on the radiating element 14 that is connected in twos and connects by coaxial line 15, can form the six-element antenna array respectively.
The coupling piece 8 of above-mentioned phase shifter and slide plate 3 parallel length of side optimal parameters are
λ
0, the length of each section of microstrip transmission line meander line is half wavelength, and the characteristic impedance of the transmission line that slide plate 3 constitutes is Z
0, the characteristic impedance of the transmission line that coupling piece 8 constitutes is
, the characteristic impedance of other output ports T1, T5 is
,, make input port T by the micro-strip meander-line impedance conversion
0Characteristic impedance to equal its input impedance be Z
0, be Z with characteristic impedance again
0Coaxial line connect, realize impedance matching.
The present invention since up and down slide plate constitute an air microstrip transmission line, thereby it is little more than the medium slide block to insert loss, phase shift range is big; Because the present invention adopts the structure of little band plate transmission line, an input signal can be decomposed into multichannel output simultaneously,, improve the antenna array gain so can realize being the phase shift of a plurality of radiating element feed and carrying out power division and impedance matching arbitrarily with a phase shifter.Actual measurement shows that frequency band range of the present invention is 800MHz～3GHz, the phase shift range flexibility and changeability, realize different phase shift ranges by the length that changes slide plate 3, with the beam scanning angle of acquisition different range, and very little to the gain effects of antenna, as shown in Figure 5.Scan 13 processes of spending from 0 degree at wave beam, the gain G of antenna changes less than 0.5dB, has to descend secondary lobe to promote well the effect that last secondary lobe suppresses and tangible " null value " filling effect of secondary lobe down.Have and can reduce blind area area in the honeycomb, improve communication quality, matching performance is good, and the advantage that production cost is low is particularly suitable for industrial production in batches.
Description of drawings:
Fig. 1 uses the structure chart of two branch's microstrip transmission line plates for the present invention
The structure chart that Fig. 2 uses three branch's microstrip transmission lines to pull for the present invention
Fig. 3 is used to Fig. 1 to contain the beam scanning antenna array instance graph of six radiating elements for the present invention
Fig. 4 is used to Fig. 2 to contain the beam scanning antenna array instance graph of ten radiating elements for the present invention
Fig. 5 is the actual measurement directional diagram of six-element antenna battle array shown in Figure 3
Fig. 6 is the actual measurement directional diagram of ten yuan of antenna arrays shown in Figure 4
Fig. 7 (a) is the "T"-shaped phase shifter structure figure of background technology
Fig. 7 (b) is the phase shifter connection in series-parallel combination of background technology, the quaternary antenna array schematic diagram of composition
Fig. 8 is the antenna array of being made up of Unit three in the background technology
Embodiment:
Referring to Fig. 1, continuous adjustable phase shifter 1 of the present invention is mainly by slide plate 3, transmission line plate 4, and coupling piece 8 is formed.Slide plate 3 by up and down two form, two ends are by medium fixture block 7 support fixation, the formation characteristic impedance is Z
0Two parallel lines transmission lines up and down, be fixed with lead-out terminal T3 at following slide plate 3 (or upper slide 3) two ends, T4, in order to Z
0Coaxial line connect.Coupling piece 8 by up and down two form " in " font structure, adopt the thick copper coin of 1mm to make, these two coupling pieces 8 are supported by a pair of medium fixture block 6 with dieelctric sheet 2, and by 9 lockings of medium pin, secured in parallel is in the outside of slide plate 3 up and down, constitutes characteristic impedance to be
The parallel lines transmission line, and the length of side is preferably
λ
g Medium pin 9 inserts from medium fixture block 6, and coupling piece 8 and upper and lower medium sheet 2 are fixed together up and down.It is the teflon plate of 0.5mm that dieelctric sheet 2 adopts thickness, between coupling piece 8 and slide plate 3, with the variation of the coupling impedance that reduces in friction between coupling piece 8 and the slide plate 3 and the sliding process to bring because of the minor variations in the gap of coupling sheet 8 and slide plate 3.The external stability of transmission line plate 4 has shielding box 5, is plugged on an end of coupling piece 8 up and down.Transmission line plate 4 adopts microstrip structure, and this microstrip transmission line is made up of not wide tortuous main feeder 10 and the not wide tortuous feeder line 11,12 that divides.Not wide meander line 10 preferably uses the gradual change microstrip line construction, and length is
λ
gInput signal is imported by T0, passes to main feeder 10, and by minute feeder line 11,12 output signals, promptly main feeder 10 is in process
λ
gBe split up into two transmission lines branches 11,12 after the length, adopt not wide line promptly not wait the input impedance parallel connection at the prong place, obtain unequal power and distribute.Output signal T1 with branch line 12 after the power division passes through coupling piece 8, be coupled to capacitive up and down on the slide plate 3, be connected respectively to two radiating elements by the two ends T3 of metal slide plate 3 and the signal of two phase change of T4 output, another road 11 by coaxial line port T2 directly with link to each other composition three-element antenna array with another radiating element.The length of each section of microstrip transmission line meander line is half wavelength, and the characteristic impedance of output port T1 is
, the characteristic impedance of T2 is Z
0By micro-strip meander-line,, make input port T with impedance conversion
0Characteristic impedance (equaling input impedance) be Z
0, be Z with characteristic impedance again
0Coaxial line connect, realize the matched well of whole phase shifter feeding network.
With reference to Fig. 2, the multiport output phase shifter that the present invention is made up of two slide plates, 3 assembly A, B and microstrip transmission line plate 4.The two ends of microstrip transmission line plate 4 are connected with slide plate 3 assembly A, B respectively, and wherein transmission line plate 4 adopts three not wide tortuous branch lines 11,12,13, constitutes.The radiofrequency signal T of input
0Be decomposed into T1, T5, T2 three tunnel outputs through main feeder 10, wherein T1 and T5 are respectively by A, the phase shift of B metal slider, the signal that is output as T3, T4, T6, T7 four tunnel phase change is delivered to each radiating element respectively, the no phase-changing signal of T2 output directly is connected with another radiating element, forms five yuan of aerial arrays.
Among Fig. 3,14 expression radiating elements, 15 expression coaxial lines, the phase shifter member 1 shown in the schematic diagrammatic sketch 1 in the frame of broken lines, three delivery outlet power of this phase shifter 1 are unequal.With radiating element 14 in twos and connect, three outputs of T2, T3, T4 that are connected respectively to phase shifter member 1 can be formed the antenna array that contains six radiating elements.This connection is the method for practical this phase shifter of use of a kind of comparison " economy ", and under the situation of beam scanning less than 13 degree, this phase shifter can accomplish that substantially antenna gain changes less than 0.5dB.Need not a plurality of cascades, reduced to increase the increase of the insertion loss that brings because of phase shifter serial number purpose.
Among Fig. 4,14 expression radiating elements, 15 expression coaxial lines, the phase shifter member shown in the schematic diagrammatic sketch 2 in the frame of broken lines, five delivery outlet power of this phase shifter are unequal.With radiating element 14 in twos and connect, be connected respectively to five outputs of T2, T3, T4, T6, T7 of phase shifter member, can form the antenna array that contains ten radiating elements.This connection also is the method for practical this phase shifter of use of a kind of comparison " economy ", can accomplish beam scanning 10 degree, and change in gain is less than 0.5dB.
The microstrip structure of above-mentioned transmission line plate 4 also can be made of the meander line 10 that a width does not wait, 10 output is T1, be connected with coupling piece 8, with energy coupling to slide plate 3, with coaxial line with slide plate three two ends delivery outlet T3, T4 links to each other with two radiating elements, to be used for that the less demanding antenna array that gains is carried out phase shift.
Fig. 5 shows, the antenna array that the utility model utilizes the GSM900 antenna for base station to form by Fig. 3, its test frequency is centre frequency 915MHz, scans the process of 13 degree from 0 degree at wave beam, the gain G of antenna changes less than 0.5dB, and have and descend secondary lobe to promote well, the effect that last secondary lobe suppresses, " null value " filling effect of following secondary lobe clearly in addition, this is to reducing blind area area in the honeycomb, improve communication quality, it is very effective reducing inter base station interference, is particularly suitable for the network optimization.
Fig. 6 shows, the antenna array that the utility model utilizes the GSM900 antenna for base station to form by Fig. 4, its test frequency is centre frequency 915MHz, the gain of the antenna array that this structure realizes is very high, reaches more than the 18dBi, and horizontal beam width is 65 degree, scan the process of 10 degree from 0 degree at wave beam, the gain G of antenna changes less than 0.5dB, and has when the part angle and descend secondary lobe to promote well, the effect of last secondary lobe inhibition.
The present invention is not limited to the above-mentioned embodiment that provides, and those skilled in the art can make different distortion under design of the present invention.
Claims (6)
1. continuous adjustable phase shifter, comprise slide mechanism, coupling network and matching network are by the mobile continuously path of control slide mechanism, the phase difference of control output signal component is characterized in that slide mechanism is to constitute an air microstrip transmission line by double layer of metal slide plate (3) up and down; Coupling network supports laterally zygomorphic two sheet metals (8) by medium fixture block (6) and constitutes ribbon feeder, is fixed on the outside of metal slide plate (3); Matching network adopts gradual change meander line structure to form microstrip transmission line plate (4), and is connected with sheet metal (8), and microstrip transmission line plate (4) is with the radiofrequency signal T of input
0Be decomposed into output signal T1, the T2 of two-way at least, send each radiating element respectively to and form antenna array.
2. phase shifter according to claim 1, branch's feedback meander line that the main feed meander line (10) that the microstrip line that it is characterized in that transmission line plate (4) is not waited by a width and at least two width do not wait constitutes, the length of each section meander line is half wavelength, to realize power match.
3. phase shifter according to claim 1 and 2, after it is characterized in that main feed meander line (10) the process half wavelength in the microstrip transmission line plate (4), be split up into two transmission lines branch (11) and (12), these two branch lines adopt not wide line to obtain power division at the prong place, with the radiofrequency signal T of input
0Be decomposed into T1 and T2 two-way, one road T1 is coupled to the two ends T3 and the T4 of metal slide plate (3) by coupling piece (8), and output phase is with respect to input signal T
0The signal of Bian Huaing serially, and send two radiating elements respectively to, another road T2 directly is connected with coaxial line, and the signal that output phase is constant is given another radiating element, forms the three-element antenna array.
4, phase shifter according to claim 3, it is characterized in that two ends output T3, the T4 of metal slide plate (3) and three ports of T2 of microstrip transmission line plate (4) output, on the radiating element (14) that is connected in twos and connects by coaxial line (15), form the six-element antenna array respectively.
5. phase shifter according to claim 1 is characterized in that metal slide plate (3) assembly is made as A, B two covers, links to each other with microstrip transmission line plate (4) two ends respectively; Main feed meander line (10) in the microstrip transmission line plate (4) is split up into the tortuous transmission line (11) of three branches, (12), (13), with the radiofrequency signal T of input
0Be decomposed into T1, T2, T5 three tunnel, T1 and T5 are output as the signal of T3, T4, T6, T7 four road phase variables respectively by A, the phase shift of B metal slider, are connected respectively to each radiating element, the signal that the T2 output phase is constant directly is connected with another radiating element, forms five yuan of aerial arrays; If in twos and connect with radiating element (14), be connected with this five tunnel output signal by coaxial line (15) respectively again, can form ten yuan of aerial arrays.
6. phase shifter according to claim 1 is characterized in that coupling piece (8) length of side optimal parameter parallel with slide plate (3) is
λ
g, the length of each section of microstrip transmission line meander line is half wavelength, and the characteristic impedance of the transmission line that slide plate (3) constitutes is Z
0, the characteristic impedance of the transmission line that coupling piece (8) constitutes is
, the characteristic impedance of another output port T1, T5 is
,, make input port T by the micro-strip meander-line impedance conversion
0Input impedance to equal its characteristic impedance be Z
0, be Z with characteristic impedance again
0Coaxial line connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021393346A CN1170336C (en) | 2002-08-07 | 2002-08-07 | Continuously adjustable phase shifter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021393346A CN1170336C (en) | 2002-08-07 | 2002-08-07 | Continuously adjustable phase shifter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1392628A true CN1392628A (en) | 2003-01-22 |
| CN1170336C CN1170336C (en) | 2004-10-06 |
Family
ID=4750038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021393346A Expired - Fee Related CN1170336C (en) | 2002-08-07 | 2002-08-07 | Continuously adjustable phase shifter |
Country Status (1)
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101816096A (en) * | 2007-10-05 | 2010-08-25 | Ace天线株式会社 | Antenna in which squint is improved |
| CN101820090A (en) * | 2010-04-15 | 2010-09-01 | 中国科学技术大学 | Novel phase shifter by adopting dentiform or comb-shape structure medium slip sheets |
| CN102790633A (en) * | 2011-05-18 | 2012-11-21 | 西门子公司 | Transmission line and passenger information system |
| CN101645524B (en) * | 2009-07-13 | 2013-02-13 | 电子科技大学 | Miniaturized electric regulating intelligent antenna phaser based on helix slow wave line |
| CN107331968A (en) * | 2016-04-28 | 2017-11-07 | 罗森伯格技术（昆山）有限公司 | A kind of device and method for controlling aerial signal frequency range to switch |
| CN109755695A (en) * | 2019-02-22 | 2019-05-14 | 摩比科技（深圳）有限公司 | A kind of phase shifter mould group, phase shifter and antenna |
| WO2020135775A1 (en) * | 2018-12-29 | 2020-07-02 | 华为技术有限公司 | Coupled feeding apparatus , phase shifter and antenna |
| CN111416191A (en) * | 2020-03-31 | 2020-07-14 | 苏治国 | Preparation method of broadband phase-adjustable phase shifter based on variable dielectric constant substrate |
| CN111416214A (en) * | 2020-04-22 | 2020-07-14 | 成都多普勒科技有限公司 | High-gain millimeter wave radar antenna with wide horizontal visual field range |
| WO2022072227A1 (en) * | 2020-09-29 | 2022-04-07 | John Mezzalingua Associates, LLC | Integrated and phase-compensated base station antenna phase shifter and calibration board |
-
2002
- 2002-08-07 CN CNB021393346A patent/CN1170336C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101816096A (en) * | 2007-10-05 | 2010-08-25 | Ace天线株式会社 | Antenna in which squint is improved |
| CN101645524B (en) * | 2009-07-13 | 2013-02-13 | 电子科技大学 | Miniaturized electric regulating intelligent antenna phaser based on helix slow wave line |
| CN101820090A (en) * | 2010-04-15 | 2010-09-01 | 中国科学技术大学 | Novel phase shifter by adopting dentiform or comb-shape structure medium slip sheets |
| CN102790633A (en) * | 2011-05-18 | 2012-11-21 | 西门子公司 | Transmission line and passenger information system |
| CN107331968A (en) * | 2016-04-28 | 2017-11-07 | 罗森伯格技术（昆山）有限公司 | A kind of device and method for controlling aerial signal frequency range to switch |
| CN107331968B (en) * | 2016-04-28 | 2024-01-26 | 普罗斯通信技术（苏州）有限公司 | Device and method for controlling switching of antenna signal frequency bands |
| WO2020135775A1 (en) * | 2018-12-29 | 2020-07-02 | 华为技术有限公司 | Coupled feeding apparatus , phase shifter and antenna |
| CN111384563A (en) * | 2018-12-29 | 2020-07-07 | 华为技术有限公司 | Coupling feeding device, phase shifter and antenna |
| CN109755695A (en) * | 2019-02-22 | 2019-05-14 | 摩比科技（深圳）有限公司 | A kind of phase shifter mould group, phase shifter and antenna |
| CN111416191A (en) * | 2020-03-31 | 2020-07-14 | 苏治国 | Preparation method of broadband phase-adjustable phase shifter based on variable dielectric constant substrate |
| CN111416191B (en) * | 2020-03-31 | 2021-08-13 | 苏治国 | Preparation method of broadband phase-adjustable phase shifter based on variable dielectric constant substrate |
| CN111416214A (en) * | 2020-04-22 | 2020-07-14 | 成都多普勒科技有限公司 | High-gain millimeter wave radar antenna with wide horizontal visual field range |
| WO2022072227A1 (en) * | 2020-09-29 | 2022-04-07 | John Mezzalingua Associates, LLC | Integrated and phase-compensated base station antenna phase shifter and calibration board |
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| Publication number | Publication date |
|---|---|
| CN1170336C (en) | 2004-10-06 |
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