CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of priority of Chinese Patent Application No. 201810587958.3, filed on Jun. 8, 2018, the entire disclosure of which is incorporated herein by reference.

TECHNICAL FIELD

Embodiments of the present disclosure relate to an adjustable polarization converter and an electronic device.

BACKGROUND

The electromagnetic wave polarization converter is an important component in the antenna feed system, which is of important for improving the channel capacity and improving the signal-to-noise ratio of the wireless communication system. A role of the polarization converter is to change the polarization state of the incident electromagnetic wave to another polarization state, such as transforming a linearly polarized electromagnetic wave into a circularly polarized electromagnetic wave, or converting a circularly polarized electromagnetic wave into a linearly polarized electromagnetic wave.

At present, according to the different ways of input and output of electromagnetic signals, the polarization converter can be divided into a space feed polarization converter and a forced feed polarization converter. When the space feed polarization converter is in operation, the electromagnetic signal is output from the signal source, enters the phase shifter by space radiation, passes through the polarization converter (in the form of transmission or reflection), and then is output by space radiation, and is finally received by the microwave signal receiver.

SUMMARY

At least one embodiment provides an adjustable polarization converter, comprising: a first substrate comprising a first base substrate and a first electrode on the first base substrate; a second substrate comprising a second base substrate and a second electrode on the base substrate; and a liquid crystal layer between the first substrate and the second substrate. The first electrode comprises a conductive frame and two triangular conductive patches. The conductive frame comprises two openings disposed in sequence, and the two triangular conductive patches are disposed in a region surrounded by the conductive frame and are centrally symmetric.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, each of the triangular conductive patches has a longest side parallel to a line connecting the two openings, and the two triangular conductive patches are centrally symmetric with respect to a first point on the line connecting the two openings.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, the conductive frame is axisymmetric with respect to the line connecting the two openings, and the first point is located at a center of the region surrounded by the conductive frame.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, the conductive frame has a circumference greater than 0.2 times a wavelength of a target electromagnetic wave in a dielectric layer and less than 1.5 times the wavelength of the target electromagnetic wave in the dielectric layer, and the dielectric layer comprises the first substrate, the liquid crystal layer, and the second substrate.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, each of the triangular conductive patches is an inequilateral triangular conductive patch, and the longest side of each of the triangular conductive patches has a length less than 0.7 times the wavelength of the target electromagnetic wave in the dielectric layer, and a height of each of the triangular conductive patches perpendicular to the longest side has a length greater than 0.5 times the wavelength of the target electromagnetic wave in the dielectric layer, and the dielectric layer comprises the first substrate, the liquid crystal layer, and the second substrate.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, the conductive frame is a rectangular ring in shape substantially.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, the longest side of each of the triangular conductive patches is closer to the conductive frame than an apex angle of each of the triangular conductive patches, a distance between the longest side of each of the triangular conductive patches and the rectangular ring is less than or equal to a width of a frame of the conductive frame, and a distance between a vertex of each of the triangular conductive patches opposite to the longest side and the line connecting the two openings is greater than or equal to zero.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, the distance between the vertex of each of the triangular conductive patches opposite to the longest side and the line connecting the two openings is greater than or equal to the width of the frame of the conductive frame.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, the conductive frame and the triangular conductive patches have an orthographic projection on the first base substrate falling into an orthographic projection of the liquid crystal layer on the first base substrate.

For example, the adjustable polarization converter provided by an embodiment of the present disclosure further comprises wires electrically connected to the first electrode and configured to provide a driving voltage to the first electrode.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, the wires are connected to the two triangular conductive patches and the conductive frame, respectively.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, each of the wires has a width less than 10 microns.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, the first electrode is on a side of the first base substrate near the liquid crystal layer, the second electrode is on a side of the second base substrate away from the liquid crystal layer, and the first electrode has an orthographic projection on the first base substrate falling within an orthographic projection of the second electrode on the first base substrate.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, each opening has a shape of a rectangle, and the rectangle has sides perpendicular or parallel to the line connecting the two openings.

For example, the adjustable polarization converter provided by an embodiment of the present disclosure further comprises a driving voltage source coupled to the first electrode and configured to provide a driving voltage to the first electrode.

For example, the adjustable polarization converter provided by an embodiment of the present disclosure further comprises: a first alignment film; and a second alignment film. The first alignment film is disposed on a surface of the first substrate near the liquid crystal layer, and the second alignment film is disposed on a surface of the second substrate near the liquid crystal layer.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, the liquid crystal layer has a thickness ranging from 0.01 mm to 0.25 mm.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, the conductive frame has a frame width ranging from 0.05 mm to 0.25 mm.

For example, in the adjustable polarization converter provided by an embodiment of the present disclosure, the first electrode is a metal electrode and the second electrode is an ITO electrode.

At least one embodiment of the present disclosure provides an electronic device comprising any of the adjustable polarization converters.

