Phase shifter and communication device using the same

摘要

A phase shifter (10) includes a comb-line (13) formed by first and second transmission lines (11 and 12) electromagnetically coupled with each other and a plurality of variable-capacitance diodes (D11, D12) connected to the first and second transmission lines (11 and 12) forming the comb-line (13). In the phase shifter (10), one end of the first transmission line (11) is connected to an input terminal (P i ), one end of the second transmission line (12) is connected to an output terminal (P o ), and the variable-capacitance diodes (D11, D12) are connected between the other ends of the first and second transmission lines (11 and 12) and the corresponding grounds.