Brush phase shifter adapted for multiport antenna

A brush phase shifter, comprising:

• an actuating member;
• a gear assembly, the gear assembly comprising a driving gear, a pair of transmission gears symmetrically positioned in an upper-lower direction and a pair of linkage gears symmetrically positioned in a left-right direction, the transmission gears comprising a first transmission gear and a second transmission gear, the linkage gears comprising a first linkage gear and a second linkage gear, the driving gear being a bevel gear, each transmission gear comprising a bevel gear portion and a cylindrical gear portion, each bevel gear portion having a large end and a small end, the corresponding cylindrical gear portion being integrally formed at the large end of each bevel gear portion, each linkage gear being a cylindrical gear, the driving gear meshing with the face-to-face bevel gear portions, the cylindrical gear portion meshing with the adjacent linkage gear and detaching from another distant linkage gear during rotation of each transmission gear;
• a first main printed circuit board and a second main printed circuit board axially symmetrically positioned in the left-right direction;
• and
• a first brush member and a second brush member also axially symmetrically positioned in the left-right direction;
• wherein both the first brush member is rotatably disposed on the first main printed circuit board and the second brush member is rotatably disposed on the second main printed circuit board when the actuating member actuates the gear assembly.