Liquid crystal phase shifter, manufacturing method of the same, and liquid crystal antenna

A method for manufacturing a liquid crystal phase shifter,

• wherein the liquid crystal phase shifter comprises:
• a first substrate and a second substrate that are arranged opposite to each other, wherein the first substrate is located above a side of the second substrate that is facing a signal emission direction of the liquid crystal phase shifter;
• at least one microstrip disposed on a side of the second substrate that is facing towards the first substrate, each microstrip comprising a first transmission line and a second transmission line, wherein the first transmission line and the second transmission line are each a coil and are nested with each other in a direction perpendicular to a plane of the second substrate, and wherein a coiling transmission direction of a radio frequency signal transmitted on the first transmission line is opposite to a coiling transmission direction of a radio frequency signal transmitted on the second transmission line;
• a ground electrode disposed on a side of the first substrate that is facing towards the second substrate, wherein the ground electrode overlaps both the first transmission line and the second transmission line in the direction perpendicular to the plane of the second substrate;
• and
• liquid crystals located between the at least one microstrip and the ground electrode, the method comprising:
• forming the ground electrode on the first substrate;
• forming the at least one microstrip on the second substrate, each of the at least one microstrip comprising the first transmission line and the second transmission line, wherein the first transmission line and the second transmission line are each a coil and are nested with each other in the direction perpendicular to the plane of the second substrate, and wherein the coiling transmission direction of the radio frequency signal transmitted on the first transmission line is opposite to the coiling transmission direction of the radio frequency signal transmitted on the second transmission line, and
• oppositely arranging the first substrate with the second substrate and filing liquid crystals between the first substrate and the second substrate, wherein, when the first substrate and the second substrate are oppositely arranged, the at least one microstrip is located on the side of the second substrate that is facing towards the first substrate, the ground electrode is located on the side of the first substrate that is facing towards the second substrate, and the ground electrode overlaps both the first transmission line and the second transmission line in the direction perpendicular to the plane of the second substrate.

A liquid crystal antenna, comprising:

• a liquid crystal phase shifter;
• a feed network configured to provide radio frequency signals;
• and
• a radiator arranged on a side of the first substrate facing away from the second substrate, and configured to radiate a phase-shifted radio frequency signal,
• wherein the liquid crystal phase shifter comprises;
• a first substrate and a second substrate that are arranged opposite to each other, wherein the first substrate is located above a side of the second substrate that is facing a signal emission direction of the liquid crystal phase shifter;
• at least one microstrip disposed on a side of the second substrate that is facing towards the first substrate, each microstrip comprising a first transmission line and a second transmission line, wherein the first transmission line and the second transmission line are each a coil and are nested with each other in a direction perpendicular to a plane of the second substrate, and wherein a coiling transmission direction of a radio frequency signal transmitted on the first transmission line is opposite to a coiling transmission direction of a radio frequency signal transmitted on the second transmission line;
• a ground electrode disposed on a side of the first substrate that is facing towards the second substrate, wherein the ground electrode overlaps both the first transmission line and the second transmission line in the direction perpendicular to the plane of the second substrate;
• and
• liquid crystals located between the at least one microstrip and the ground electrode.