Wideband transceiver

A wideband transceiver comprising:

• high- and low-band-pass filters for dividing a communication band into high and low bands to form transmission and reception channels;
• circulators, wherein transmission and reception paths are switched over by combining signal propagating directions of the circulators and out-of-band signal reflecting directions of the high- and low band-pass filters according to specified transmission and reception frequencies, wherein the circulators include:
• a first circulator having a first terminal for receiving a transmission signal, a second terminal connected to a first terminal of the low-band-pass filter, and a third terminal;
• a second circulator having a first terminal for providing a reception signal, a second terminal connected to the third terminal of the first circulator, and a third terminal connected to a first terminal of the high-band-pass filter;
• and
• a third circulator having a first terminal connected to a second terminal of the high-band-pass filter, a second terminal connected to input/output means for transmitting and receiving transmission and reception signals, and a third terminal connected to a second terminal of the low-band-pass filter,
• the circulating direction of each of the circulators being from the first terminal to the second terminal, from the second terminal to the third terminal, and from the third terminal to the first terminal.

A wideband transceiver comprising:

• transmitting and receiving filters for dividing a communication band into high and low bands to form transmission and reception channels;
• means for guiding a transmitting signal reflected by the receiving filter to an output circuit;
• means for guiding a received signal reflected by the transmitting filter to a reception circuit;
• and
• a frequency controller for switching over the high and low bands assignment of the transmission and reception frequency signals by setting local oscillation frequencies provided to the transceiver section to change over the specified frequencies of the transmission and reception frequency signals.

A wideband transceiver having filters for dividing a communication band into high and low bands to form transmission and reception channels:

• comprising;
• means for extracting transmitting and received signals reflected by the filters;
• means for guiding the reflected transmitting signal to an output circuit;
• means for guiding the reflected received signal to a reception circuit;
• and
• a frequency controller for switching over the high and low bands assignment of the transmission and reception frequency signals by setting local oscillation frequencies provided to the transceiver section to change over the specified frequencies of the transmission and reception frequency signals.