Wireless communication device

A wireless communication apparatus which establishes communication using reception and transmission frequencies simultaneously,

• characterized in that an interference signal cutoff circuit for cutting interference signals having a frequency equal to the transmission frequency is interposed between the input terminal to a receiver and an antenna.

A wireless communication apparatus which establishes communication using reception and transmission frequencies simultaneously,

• characterized in that an interference signal cutoff circuit for cutting interference signals having frequencies approximately equal to the absolute value of the sum or difference of the reception and transmission frequencies is interposed between the input terminal to a transmitter and an antenna.

A wireless communication apparatus which establishes communication using reception and transmission frequencies simultaneously and has a switch made up of active elements interposed between the input terminal to a receiver and an antenna,

• characterized in that an interference signal cutoff circuit for cutting interference signals having frequencies approximately equal to the absolute value of the sum or difference of the reception and transmission frequencies is interposed between the switch and the antenna.

A wireless communication apparatus which establishes communication using reception and transmission frequencies simultaneously and has a switch made up of active elements interposed between the input terminal to a receiver and an antenna,

• characterized in that an interference signal cutoff circuit for cutting interference signals having frequencies approximately equal to the absolute value of the sum or difference of the reception and transmission frequencies is interposed between the switch and the input terminal to the receiver.

A wireless communication apparatus which establishes communication using reception and transmission frequencies simultaneously and has a switch made up of active elements interposed between the input terminal to a receiver and an antenna,

• characterized in that interference signal cutoff circuits for cutting interference signals having frequencies approximately equal to the absolute value of the sum or difference of the reception and transmission frequencies are interposed between the antenna and the switch and between the switch and the input terminal to the receiver.

A wireless communication apparatus which establishes communication using reception and transmission frequencies simultaneously and has a switch made up of active elements interposed between the input terminal to a receiver and an antenna,

• characterized in that an impedance adjusting circuit for adjusting the impedance to interference signals having frequencies approximately equal to the absolute value of the sum or difference of the reception and transmission frequencies is interposed between the switch and the input terminal to the receiver.

A wireless communication apparatus which establishes communication using reception and transmission frequencies simultaneously,

• characterized in that a circuit presenting a low impedance to interference signals having frequencies approximately equal to the absolute value of the sum or difference of the reception and transmission frequencies is provided as a part of an antenna.

A wireless communication apparatus which establishes communication using reception and transmission frequencies simultaneously,

• characterized in that a circuit which presents high impedances at the reception frequency and the transmission frequency and which presents a low impedance to interference signals having frequencies approximately equal to the absolute value of the sum or difference of the reception and transmission frequencies is provided as a part of an antenna.