| 摘要 |
The present invention can be operated at a plurality of frequency bands, and is capable of stably operating a transmit-receive circuit. This non-reciprocal circuit element is provided with high-pass circulators (11, 12), each of which has a first center conductor (21), a second center conductor (22) and a third center conductor (23) which are insulated and disposed, so as to intersect, on a microwave magnetic body (20) to which a DC magnetic field is applied. The high-pass circulators (11, 12) each have capacitance elements (C1, C2, C3) connected in series between one end of the first center conductor (21) and an antenna port (P11), between one end of the second center conductor (22) and a receiving port (P12), and between one end of the third center conductor (23) and a transmitting port (P13). The pass band of the circulator (11) is lower than the pass band of the circulator (12). The antenna ports (P11) of the circulators (11, 12) are electrically connected so as to form a single composite antenna port (ANT), and a low-pass filter (LPF) is inserted between the composite antenna port (ANT) and the antenna port (P11) of the circulator (11). |
