Digital phase shifter

A digital phase shifter comprising:

• at least one first digital phase shift circuit group in which a plurality of digital phase shift circuits are connected in cascade;
• at least one second digital phase shift circuit group in which a plurality of digital phase shift circuits are connected in cascade;
• and
• at least one bend-type connection unit connecting a first digital phase shift circuit located at an end portion of the first digital phase shift circuit group and a second digital phase shift circuit located at an end portion of the second digital phase shift circuit group,
• wherein each digital phase shift circuit is a circuit including at least a signal line, two inner lines provided on both sides of the signal line, two outer lines provided outside of the two inner lines, a first ground conductor connected to one end of each of the two inner lines and the two outer lines, a second ground conductor connected to the other end of each of the two outer lines, and two electronic switches, one thereof being provided between the other end of one of the two inner lines and the second ground conductor, the other thereof being provided between the other end of the other of the two inner lines and the second ground conductor, the circuit being set in a low-delay mode in which a return current flows through the two inner lines or a high-delay mode in which a return current flows through the two outer lines,
• wherein a first capacitor is connected in parallel to at least one of a first connection line of the connection unit connecting the signal line of the first digital phase shift circuit and the signal line of the second digital phase shift circuit, a position in a vicinity of a connection position between signal lines of two adjacent digital phase shift circuits constituting the first digital phase shift circuit group, and a position in a vicinity of a connection position between signal lines of two adjacent digital phase shift circuits constituting the second digital phase shift circuit group,
• wherein at least one of the plurality of digital phase shift circuits includes:
• a second capacitor connected between the signal line and at least one of the first ground conductor and the second ground conductor;
• and
• a second electronic switch configured to switch between whether or not to connect the second capacitor between the signal line and the at least one of the first ground conductor and the second ground conductor, and
• wherein the first capacitor constitutes no digital phase shift circuit.