Feed stripline, phase shifter, array antenna, and base station

An apparatus, comprising:

• a feed stripline comprising:
• a signal input line;
• a first power branch line;
• and
• a second power branch line, wherein:
• a first end of the signal input line is configured to be conductively coupled to an external signal source,
• a second end of the signal input line is electrically connected to each of the first power branch line and the second power branch line,
• the first power branch line comprises a jump structure,
• the first power branch line spans across the second power branch line from a first side of the second power branch line to a second side of the second power branch line via the jump structure, and
• the jump structure and the second power branch line are spaced apart from each other.

An array antenna, comprising:

• a radiation array;
• and
• a phase shifter coupled to the radiation array, the phase shifter comprising a signal input line, a first power branch line, and a second power branch line, wherein:
• a first end of the signal input line is configured to be conductively coupled to an external signal source,
• a second end of the signal input line is electrically connected to each of the first power branch line and the second power branch line,
• the first power branch line comprises a jump structure,
• the first power branch line spans across the second power branch line from a first side of the second power branch line to a second side of the second power branch line via the jump structure, and
• the jump structure and the second power branch line are spaced apart from each other.