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发明背景对于许多无线电通信系统,在两点间通信时,有可能仅提供单向通信。例如,移动无线电台处于无线电接收状态时通常需要一个控制装置的推式通话开关,以便提供无线电发射。在这种情况下,收发信机耦合到一条共用天线。但是,由于连接方法是转换的,所以收发信机在同时工作时不能耦合。虽然,已提供的装置,允许双工收发信机使用同样天线时在不同频率工作,但是,据了解现有的装置不仅庞大,而且也比较昂贵。再就是,只有收发频率的间隔宽时,才能提供满意的工作,且这样的装置仅用于预定的频率。为适用于不同的频率,就需要使用不同的结
BACKGROUND OF THE INVENTION For many radiocommunication systems, it is possible to provide only one-way communication when communicating between two points. For example, a push-to-talk switch of a control device is usually required when the mobile radio is in the radio receiving state in order to provide radio transmission. In this case, the transceiver is coupled to a common antenna. However, since the connection method is switched, the transceivers can not be coupled at the same time. Although devices have been provided that allow duplex transceivers to operate at different frequencies when using the same antenna, it is understood that existing devices are not only bulky but also expensive. Again, satisfactory performance is achieved only if the frequency of transceiving is wide, and such devices are only intended for the intended frequency. To be suitable for different frequencies, different knots need to be used