Liquid crystal phase shifter, method for producing the same and method for shifting phase of electromagnetic wave

A method for producing a liquid crystal phase shifter, the method comprising:

• providing a first base substrate and a second base substrate;
• forming a first electromagnetic wave transport layer and a second electromagnetic wave transport layer for transporting electromagnetic waves on a surface of the first base substrate;
• and
• forming a first liquid crystal modulation portion and a second liquid crystal modulation portion between the second base substrate and the first base substrate formed with the first electromagnetic wave transport layer and the second electromagnetic wave transport layer, the first liquid crystal modulation portion being formed on a side of the first electromagnetic wave transport layer away from the first base substrate, and the second liquid crystal modulation portion being formed on a side of the second electromagnetic wave transport layer away from the first base substrate,
• wherein the first liquid crystal modulation portion is configured to modulate a phase of electromagnetic waves in a first frequency range and the second liquid crystal modulation portion is configured to modulate a phase of electromagnetic waves in a second frequency range different from the first frequency range.

A method for shifting a phase of electromagnetic waves by using a liquid crystal phase shifter, the liquid crystal phase shifter comprising:

• a first base substrate and a second base substrate opposed to each other;
• a first liquid crystal modulation portion and a second liquid crystal modulation portion between the first base substrate and the second base substrate;
• a first electromagnetic wave transport layer between the first base substrate and the first liquid crystal modulation portion;
• and
• a second electromagnetic wave transport layer between the first base substrate and the second liquid crystal modulation portion,
• wherein the first liquid crystal modulation portion is configured to modulate a phase of electromagnetic waves in a first frequency range and the second liquid crystal modulation portion is configured to modulate a phase of electromagnetic waves in a second frequency range different from the first frequency range,
• the method comprising:
• selecting a target liquid crystal modulation portion from the first liquid crystal modulation portion and the second liquid crystal modulation portion and selecting a target electromagnetic wave transport layer from the first electromagnetic wave transport layer and the second electromagnetic wave transport layer, depending on a predetermined frequency range of the electromagnetic waves, wherein an orthographic projection of the target liquid crystal modulation portion on the first base substrate being overlapped with an orthographic projection of the target electromagnetic wave transport layer on the first base substrate;
• controlling liquid crystal molecules in a liquid crystal layer in the target liquid crystal modulation portion to deflect depending on a target phase of the electromagnetic waves;
• and
• transporting the electromagnetic waves by using the target electromagnetic wave transport layer such that the liquid crystal molecules in the liquid crystal layer in the target liquid crystal modulation portion modulate a phase of the electromagnetic waves transported by the target electromagnetic wave transport layer.