EP4376212A1 - Système et procédé de commande de déphasage - Google Patents

Système et procédé de commande de déphasage Download PDF

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Publication number
EP4376212A1
EP4376212A1 EP23800720.7A EP23800720A EP4376212A1 EP 4376212 A1 EP4376212 A1 EP 4376212A1 EP 23800720 A EP23800720 A EP 23800720A EP 4376212 A1 EP4376212 A1 EP 4376212A1
Authority
EP
European Patent Office
Prior art keywords
liquid crystal
radio frequency
transmission line
frequency transmission
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23800720.7A
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German (de)
English (en)
Inventor
Nengwen YANG
Wenrong HE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CICT Mobile Communication Technology Co Ltd
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CICT Mobile Communication Technology Co Ltd
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Filing date
Publication date
Application filed by CICT Mobile Communication Technology Co Ltd filed Critical CICT Mobile Communication Technology Co Ltd
Publication of EP4376212A1 publication Critical patent/EP4376212A1/fr
Pending legal-status Critical Current

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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
    • 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

Definitions

  • the present application relates to the field of communication technology, and in particular to a phase shift control system and method.
  • a phase shifter is mainly used to adjust a phase of a radio frequency signal, and is a necessary device for phased array antenna system and mobile communication system.
  • a phase (electrical length) of a radio frequency transmission line inside the phase shifter By changing a phase (electrical length) of a radio frequency transmission line inside the phase shifter, a phase of a corresponding radiating element in the antenna array is changed, which affects a synthesized beam of the radiating element of the antenna, thereby realizing a control of the beam of the antenna.
  • a phase (electrical length) of a radio frequency signal depends on a physical length of the radio frequency transmission line and a dielectric constant of a medium of the radio frequency transmission line.
  • Phase shifters are divided into two types: one type is to change the physical length of the radio frequency transmission line, and the other type is to change the dielectric constant of the medium of the radio frequency transmission line, so as to change the electrical length.
  • the liquid crystal phase shifter system includes a crystal phase shifter 10 and a voltage controlling module 20.
  • the liquid crystal phase shifter 10 includes an upper substrate 11, a radio frequency transmission line 12, a ground layer 14, a lower substrate 15 and a liquid crystal layer 13 between the radio frequency transmission line 12 and the ground layer 14.
  • a deflection of the liquid crystal layer 13 is controlled by changing the voltage between the radio frequency transmission line 12 and the ground layer 14 by the voltage controlling module 20. The deflection of the liquid crystal layer 13 would cause changing of the dielectric constant of the surrounding effective area in the radio frequency transmission line 12, as such the electrical length of the radio frequency transmission line 12 is changed and the phase of the radio frequency transmission line is changed.
  • the dielectric constant of the liquid crystal material is not only affected by the applied voltage, but also affected by surrounding environment such as temperatures, pressures and other external factors, and a phase shift accuracy of the liquid crystal phase shifter based on liquid material cannot be ensured by a static control of the applied voltage.
  • phase shift control system including:
  • the target voltage is determined by a target value of the dielectric constant of the liquid crystal layer.
  • the target value of the dielectric constant is determined by a phase value.
  • the radio frequency transmission line is disposed on a side of a first substrate of the liquid crystal phase shifter close to the liquid crystal layer
  • the ground layer is disposed on a side of a second substrate of the liquid crystal phase shifter close to the liquid crystal layer
  • the liquid crystal layer is disposed between the first substrate and the second substrate.
  • the first substrate and the second substrate are arranged in parallel.
  • the liquid crystal layer is made of a single liquid crystal material or a mixed liquid crystal material.
  • An embodiment of the present application provides a phase shift control method, including:
  • phase shift control method includes: a difference value between the actual measured value of the dielectric constant and the target value of the dielectric constant is less than or equal to the preset deviation.
  • the target value of the dielectric constant is determined by a phase value.
  • the radio frequency transmission line is disposed on a side of a first substrate of the liquid crystal phase shifter close to the liquid crystal layer
  • the ground layer is disposed on a side of a second substrate of the liquid crystal phase shifter close to the liquid crystal layer
  • the liquid crystal layer is disposed between the first substrate and the second substrate.
  • 10 liquid phase shifter
  • 11 first substrate
  • 12 radio frequency transmission line
  • 13 liquid crystal layer
  • 14 ground layer
  • 15 second substrate
  • 20 voltage controlling module
  • 30 capacitance detecting module
  • FIG. 2 is a schematic structural diagram of a phase shift control system provided by an embodiment of the present application. As shown in FIG. 2 , the phase shift control system includes:
  • the phase shift control system provided by the present application includes the liquid crystal phase shifter 10, the voltage controlling module 20 and the capacitance detecting module 30.
  • the capacitance detecting module 30 is used for detecting the capacitance value between the radio frequency transmission line 12 and the ground layer 14, and transmitting the capacitance value to the voltage controlling module 20.
  • the voltage controlling module 20 obtains the actual measured value of the dielectric constant of the liquid crystal layer 13 based on a pre-stored first correspondence relationship of the capacitance value.
  • the voltage controlling module 20 adjusts, based on the actual measured value of the dielectric constant, the voltage between the radio frequency transmission line 12 and the ground layer 14 until the difference value between the voltage and the target voltage is less than or equal to the preset deviation, so as to control the liquid crystal layer 13 to deflect, as such the dielectric constant of a medium surrounding the radio frequency transmission line 12 is changed, a phase value of the radio frequency transmission line 12 is changed and the purpose of changing phase is achieved
  • the capacitance detecting module 30 detects the capacitance value between radio frequency transmission line 12 and the ground layer 14 of the liquid crystal phase shifter 10.
  • the voltage controlling module 20 adjusts, based on the actual measured value of the dielectric constant of the liquid crystal layer 13 of the liquid crystal phase shifter 10, the voltage between the radio frequency transmission line 12 and the ground layer 14. The adjusting operation is repeated until the difference value between the voltage and the target voltage corresponding to a target value of the dielectric constant is less than or equal to the preset deviation, so as to accomplish the phase shift process of the liquid crystal phase shifter.
  • the measured value of the dielectric constant is close or equal to the target value of the dielectric constant.
  • the preset deviation can be set to zero or close to zero, when the preset deviation is zero, it represents that the actual measured value of the dielectric constant equals to the target value of the dielectric constant; when the preset deviation is close to zero, it represents that the actual measured value of the dielectric constant is close to the target value of the dielectric constant.
  • the target voltage is determined by the target value of the dielectric constant of the liquid crystal layer.
  • the target value of the dielectric constant can be a value of the dielectric constant of the medium of the liquid crystal layer when the phase value is a desired phase value.
  • the target voltage applied on the voltage controlling module 20 can be obtained by statistics of experimental data, that is the target voltage is the voltage between the radio frequency transmission line 12 and the ground layer 14 when the value of the dielectric constant is the target value of the dielectric constant.
  • a voltage of the voltage controlling module 20 is adjusted to the target voltage, and the capacitance detecting module 20 is used for detecting the capacitance value between the radio frequency transmission line 12 and the ground layer 14, and then the actual measured value of the dielectric constant is obtained by the pre-stored first correspondence relationship.
  • the voltage controlling module 20 compares the actual measured value of the dielectric constant and the target value of the dielectric constant, and adjusts the voltage between the radio frequency transmission line 12 and the ground layer 14 until the difference value between the voltage and the target voltage is less than or equal to the preset deviation. For example, when the actual measured value of the dielectric constant is less than the target value of the dielectric constant, the voltage between the radio frequency transmission line 12 and the ground layer 14 is increased; when the actual measured value of the dielectric constant is greater than the target value of the dielectric constant, the voltage between the radio frequency transmission line 12 and the ground layer 14 is decreased.
  • the target value of the dielectric constant is determined by the phase value.
  • the target value of the dielectric constant of the liquid crystal layer 13 corresponding to the desired phase value can be obtained by a calculation formula between a pre-stored phase value and the dielectric constant.
  • phase value ⁇ ⁇ L / ⁇
  • ⁇ the phase value
  • ⁇ the dielectric constant
  • L a physical length of the radio frequency transmission line
  • ⁇ a wavelength of an electromagnetic wave of a specific frequency
  • the liquid crystal phase shifter 10 may include a first substrate 11, the radio frequency transmission line 12, the liquid crystal layer 13, the ground layer 14 and a second substrate 15.
  • the first substrate 11, the radio frequency transmission line 12, the liquid crystal layer 13, the ground layer 14 and the second substrate 15 are arranged from top to bottom or from bottom to top.
  • the transmission line 12 is disposed on a side the first substrate 11 of the liquid crystal phase shifter 10 close to the liquid crystal layer 13
  • the ground layer 14 is disposed on a side of the second substrate 15 of the liquid crystal phase shifter close to the liquid crystal layer 13
  • the liquid crystal layer 13 is disposed between the first substrate 11 and the second substrate 15.
  • the first substrate 11 and the second substrate 15 are arranged in parallel.
  • the first substrate 11 is arranged on top of the liquid crystal phase shifter 10
  • the second substrate 15 is arranged on bottom of the liquid crystal phase shifter 10
  • the first substrate 11 and the second substrate 15 are arranged in parallel.
  • liquid crystal phase shifter 10 Only a basic composition of the liquid crystal phase shifter 10 is introduced. Liquid crystal phase shifters based on different basic principles can be applied to the phase shift control system of the present application, which is not repeated here.
  • the liquid crystal layer 13 is made of a single liquid crystal material or a mixed liquid crystal material.
  • the liquid crystal layer 13 can be made of the single liquid crystal material, such as a nematic liquid crystal, a twisted nematic liquid crystal, etc.
  • the liquid crystal layer 13 can also be made of the mixed liquid crystal material, such as a mixed crystal, etc.
  • the liquid crystal layer 13 may have a uniform thickness in a radial direction to achieve a better phase shift effect.
  • the thickness of the liquid crystal layer 13 may be determined by an actual requirement, for example, by the phase value, response time, insertion loss, etc.
  • a phase shift accuracy of a radio frequency signal can be improved, as such an accuracy of shaped-beam of antenna is improved.
  • the phase shift control system provided by the present application, compared to the related art, adds the feedback mechanism, and adds the capacitance detecting module on the basis of the liquid crystal phase shifter control system of the related art.
  • the capacitance value between the radio frequency transmission line and the ground layer is detected by the capacitance detecting module, the actual measured value of the dielectric constant of the liquid crystal layer is calculated based on the detected capacitance value, and the voltage between the radio frequency transmission line and the ground layer is adjusted by comparing the actual measured value of the dielectric constant and the target value of the dielectric constant.
  • influence of external factors such as temperature, pressure, etc., in surrounding environment is eliminated, and the phase shift is more accurate and has higher precision.
  • phase shift control method provided by the present application is described below, which is achieved based on the phase shift control system described above.
  • FIG. 3 is a schematic flowchart of a phase shift control method provided by an embodiment of the present application. As shown in FIG. 3 , the method includes:
  • the target voltage is determined by a target value of the dielectric constant of the liquid crystal layer.
  • the target value of the dielectric constant is determined by a phase value.
  • the radio frequency transmission line is disposed on a side of a first substrate of the liquid crystal phase shifter close to the liquid crystal layer
  • the ground layer is disposed on a side of a second substrate of the liquid crystal phase shifter close to the liquid crystal layer
  • the liquid crystal layer is disposed between the first substrate and the second substrate, and the first substrate and the second substrate are arranged in parallel.
  • the method for phase shift control provided by the present application, compared to the related art, adds the feedback mechanism, and adds the capacitance detecting module on the basis of the liquid crystal phase shifter control system of the related art.
  • the capacitance value between the radio frequency transmission line and the ground layer is detected by the capacitance detecting module, the actual measured value of the dielectric constant of the liquid crystal layer is calculated based on the detected capacitance value, and the voltage between the radio frequency transmission line and the ground layer is adjusted by comparing the actual measured value of the dielectric constant and the target value of the dielectric constant.
  • influence of external factors such as temperature, pressure, etc., in surrounding environment is eliminated, and the phase shift is more accurate and has higher precision.

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  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
EP23800720.7A 2022-10-08 2023-05-22 Système et procédé de commande de déphasage Pending EP4376212A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202211222948.2A CN115621687A (zh) 2022-10-08 2022-10-08 移相控制系统及方法
PCT/CN2023/095503 WO2024074045A1 (fr) 2022-10-08 2023-05-22 Système et procédé de commande de déphasage

Publications (1)

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EP4376212A1 true EP4376212A1 (fr) 2024-05-29

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EP (1) EP4376212A1 (fr)
CN (1) CN115621687A (fr)
WO (1) WO2024074045A1 (fr)

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CN115621687A (zh) * 2022-10-08 2023-01-17 中信科移动通信技术股份有限公司 移相控制系统及方法

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JPWO2003065494A1 (ja) * 2002-01-31 2005-05-26 株式会社東芝 マイクロ波移相器及び電力増幅器
CN110824734A (zh) * 2018-08-10 2020-02-21 北京京东方传感技术有限公司 液晶移相器及液晶天线
JP7222738B2 (ja) * 2019-02-06 2023-02-15 株式会社ジャパンディスプレイ フェーズドアレイアンテナ装置
CN110233315B (zh) * 2019-06-14 2021-12-28 京东方科技集团股份有限公司 移相度补偿装置、移相度补偿系统及方法
CN112130357B (zh) * 2020-09-30 2022-07-19 厦门天马微电子有限公司 显示面板、显示面板温度检测方法及显示装置
CN114883794B (zh) * 2022-04-27 2024-04-19 京东方科技集团股份有限公司 液晶天线、其介电常数测量方法及其驱动方法
CN115621687A (zh) * 2022-10-08 2023-01-17 中信科移动通信技术股份有限公司 移相控制系统及方法

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CN115621687A (zh) 2023-01-17

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Owner name: CICT MOBILE COMMUNICATION TECHNOLOGY CO., LTD.