Patent ID: 9583808
Date: 2017-02-28
CPC Classifications: H01P,H03H

Claim:
1. A nonreversible circuit device including first and second circulators of high pass type, each circulator including a first central conductor, a second central conductor, and a third central conductor arranged on a microwave magnetic body, to which a DC magnetic field is applied from a permanent magnet, in a relation intersecting each other in a mutually insulated state, and capacitance elements connected respectively in series between one end of the first central conductor and an antenna port, between one end of the second central conductor and a reception port, and between one end of the third central conductor and a transmission port, wherein a pass frequency band of the first circulator is lower than a pass frequency band of the second circulator, the respective antenna ports of the first and second circulators are electrically connected to provide one combined antenna port, and a low pass filter is inserted between the combined antenna port and the antenna port of the first circulator.