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概述一般在异频双工通信中采用合适的双工器可提供收发机之间必要的始终不变的隔离,这样可以保证收发共用一根天线。这根天线能给发射机和按收机提供同样的方向图并且保证接收机不致被阻塞或产生互调干扰。目前,双工器的技术指标要求收发隔离为60～90dB,而插入损耗不大于1～3dB。而双工器的形式分为陷波式和带通式。根据有关规定,450MHz 频段通信频带为20MHz,即从450～470MHz,收发频率
General The general use of suitable duplexers in inter-frequency duplex communication provides the necessary constant isolation between the transceivers, thus ensuring that transceivers share an antenna. This antenna gives the transmitter and receiver the same pattern and ensures that the receiver is not blocked or intermodulated. At present, the technical specifications of the duplexer require sending and receiving isolation is 60 ~ 90dB, and the insertion loss is not more than 1 ~ 3dB. The diplexer is divided into the form of trap and band pass. According to relevant regulations, 450MHz frequency band communication band is 20MHz, that is, from 450 ~ 470MHz, send and receive frequency