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CN-122026036-A - Electrically adjustable waveguide digital phase shifter based on waveguide transmission line

CN122026036ACN 122026036 ACN122026036 ACN 122026036ACN-122026036-A

Abstract

The invention provides an electrically adjustable waveguide digital phase shifter based on a waveguide transmission line, which comprises the waveguide transmission line and at least one phase shifting unit, wherein the waveguide transmission line is provided with a waveguide cavity extending along the transmission direction, the at least one phase shifting unit is arranged in the waveguide cavity along the electromagnetic wave transmission direction and is positioned at the center of the waveguide cavity, each phase shifting unit comprises a dielectric substrate, a pair of metal conductive sheet bodies, a pair of radio frequency control units and a first metal ground, and the radio frequency control units have a conducting state and/or a disconnecting state so that the pair of metal conductive sheet bodies have an open circuit state and/or a short circuit state. The phase shifter has at least four different phase states, the structural parameters of the metal conductive sheet body can be adjusted to obtain uniform phase shifting steps, the volume is not increased, the high phase shifter precision and the rapid switching of the phase states are realized, the phase shifter has the advantages of easy production, strong practicability and small volume, and the requirements of a modern communication system can be well met.

Inventors

  • WANG SHIWEI
  • ZHANG SHUQING
  • Yu Xuzhou
  • Mohammed Uzar

Assignees

  • 深圳大学

Dates

Publication Date
20260512
Application Date
20260324

Claims (10)

  1. 1. The electrically adjustable waveguide digital phase shifter based on the waveguide transmission line is characterized by comprising the waveguide transmission line and at least one phase shifting unit, wherein the waveguide transmission line is provided with a waveguide cavity extending along the transmission direction, and the at least one phase shifting unit is arranged in the waveguide cavity along the electromagnetic wave conduction direction and is positioned in the center of the waveguide cavity; Each phase shifting unit comprises a dielectric substrate, a pair of metal conductive sheet bodies, a pair of radio frequency control units and a first metal ground, wherein the first surface of the dielectric substrate comprises a central area and a peripheral area surrounding the central area, the pair of metal conductive sheet bodies are arranged in the central area of the same first surface, and the pair of radio frequency control units and the first metal ground are arranged in the peripheral area of the same first surface; On the same first surface, one metal conductive sheet body is connected with the first metal ground through one radio frequency control unit, and the radio frequency control unit is in a conducting state and/or a disconnecting state, so that the pair of metal conductive sheet bodies are in an open circuit state and/or a short circuit state.
  2. 2. The electrically tunable waveguide digital phase shifter based on a waveguide transmission line of claim 1, wherein a pair of the metallic conductive sheets comprises a first metallic patch and a second metallic patch, and wherein the first metallic patch is of a different size than the second metallic patch.
  3. 3. The electrically tunable waveguide digital phase shifter based on a waveguide transmission line according to claim 1, wherein the dielectric substrate has a second surface, the first surface and the second surface are respectively disposed on opposite sides of the dielectric substrate, the second surface is provided with a second metal ground, and the first metal ground and the second metal ground are connected through an outer wall of the waveguide cavity and form a radio frequency ground.
  4. 4. The electrically tunable waveguide digital phase shifter based on a waveguide transmission line according to claim 1, wherein the radio frequency control unit comprises a diode and a dc bias circuit, one of the metal conductive sheets being connected to the dc bias circuit through the diode, the dc bias circuit being connected to the anode of the diode, and the cathode of the diode being connected to the first metal ground.
  5. 5. The electrically tunable waveguide digital phase shifter based on a waveguide transmission line according to claim 4, wherein the dc bias circuit comprises a band-stop filter that is equivalently inductive at a center frequency and has a center frequency that is the same as the center frequency of the electrically tunable waveguide digital phase shifter.
  6. 6. The electrically tunable waveguide digital phase shifter based on a waveguide transmission line according to claim 4, wherein the diodes are connected to a bias voltage control circuit or FPGA controller for controlling the on or off of several of the diodes.
  7. 7. The electrically tunable waveguide digital phase shifter based on a waveguide transmission line of claim 1, wherein the radio frequency control unit is a radio frequency switch chip, and the metal conductive sheet body is connected to the first metal ground through the radio frequency switch chip.
  8. 8. The electrically tunable waveguide digital phase shifter based on a waveguide transmission line of claim 1, wherein the waveguide transmission line is rectangular or circular in shape.
  9. 9. The electrically tunable waveguide digital phase shifter based on the waveguide transmission line according to claim 1, wherein when the waveguide transmission line is circular in shape, the electrically tunable waveguide digital phase shifter further comprises a first metal probe and a second metal probe, one end of the first metal probe and one end of the second metal probe penetrate into the waveguide cavity and are in an open circuit state, the other end of the first metal probe is connected with the inner wall of the waveguide cavity and is used for forming circularly polarized waves, and the other end of the second metal probe extends out of the waveguide cavity and is externally connected with a coaxial feed structure and is used for feeding the waveguide cavity.
  10. 10. The electrically tunable waveguide digital phase shifter based on a waveguide transmission line of claim 9, wherein one end of the second metal probe is disposed perpendicular to one end of the first metal probe.

Description

Electrically adjustable waveguide digital phase shifter based on waveguide transmission line Technical Field The invention relates to the technical field of wireless communication, in particular to an electrically adjustable waveguide digital phase shifter based on a waveguide transmission line. Background After the sixties of the last century, phased array radars were widely used in the aerospace and military fields, and phase shifters were also widely used as their core devices. With the evolution of mobile communication technology, the fifth generation mobile communication has been fully commercialized, the sixth generation mobile communication technology is also coming, and the construction scale of related base stations is also continuously expanding. Currently, most of base stations adopt electrically-tunable antennas, and the phase of the base stations is adjusted through a phase shifter to control the beam inclination angle, so that the network coverage capacity is improved. In addition, in the Beidou navigation satellite system, the implementation of the beam forming technology is not separated from the support of the phase shifter. Compared with the traditional planar phase shifter based on the dielectric substrate, the waveguide phase shifter has higher power bearing capacity and better reliability. However, most waveguide phase shifters in the prior art adopt a mechanical adjustment manner, and the phase adjusting structure of the waveguide phase shifter tends to be large in size. Based on the current market demand and research situation, the waveguide phase shifter which has compact structure, controllable electric adjustment and digital adjustment is researched and designed, and has very high academic research value and engineering application value. Disclosure of Invention The invention aims to provide an electrically adjustable waveguide digital phase shifter based on a waveguide transmission line, which has a compact structure and is controllable in electric adjustment and realizes digital adjustment. The invention provides an electrically adjustable waveguide digital phase shifter based on a waveguide transmission line, which comprises the waveguide transmission line and at least one phase shifting unit, wherein the waveguide transmission line is provided with a waveguide cavity extending along the transmission direction, and the at least one phase shifting unit is arranged in the waveguide cavity along the electromagnetic wave conduction direction and is positioned in the center of the waveguide cavity; Each phase shifting unit comprises a dielectric substrate, a pair of metal conductive sheet bodies, a pair of radio frequency control units and a first metal ground, wherein the first surface of the dielectric substrate comprises a central area and a peripheral area surrounding the central area, the pair of metal conductive sheet bodies are arranged in the central area of the same first surface, and the pair of radio frequency control units and the first metal ground are arranged in the peripheral area of the same first surface; On the same first surface, one metal conductive sheet body is connected with the first metal ground through one radio frequency control unit, and the radio frequency control unit is in a conducting state and/or a disconnecting state, so that the pair of metal conductive sheet bodies are in an open circuit state and/or a short circuit state. Optionally, the pair of metal conductive sheets includes a first metal patch and a second metal patch, and the first metal patch is different in size from the second metal patch. Optionally, the dielectric substrate is provided with a second surface, the first surface and the second surface are respectively arranged at two opposite sides of the dielectric substrate, the second surface is provided with a second metal ground, and the first metal ground and the second metal ground are connected through the outer wall of the waveguide cavity and form a radio frequency ground. Optionally, the radio frequency control unit includes a diode and a dc bias circuit, one of the metal conductive sheets is connected to the dc bias circuit through the diode, the dc bias circuit is connected to the anode of the diode, and the cathode of the diode is connected to the first metal ground. Optionally, the direct current bias circuit includes a band-stop filter that is equivalently inductive at a center frequency, and the center frequency of the band-stop filter is the same as the center frequency of the electrically tunable waveguide digital phase shifter. Optionally, the diodes are connected with a bias voltage control circuit or an FPGA controller, and the bias voltage control circuit or the FPGA controller is used for controlling on or off of a plurality of the diodes. Optionally, the radio frequency control unit is a radio frequency switch chip, and the metal conductive sheet body is connected with the first metal ground through the radio frequ