PURPOSE: To reduce number of device input output interface circuits to the utmost by integrating a transmission use high output amplifier and a reception use low noise amplifier so as to suppress output decrease and noise characteristic deterioration thereby realizing 2-way simultaneous communication and simplifying the installation.

CONSTITUTION: An output of a transmission high output amplifier stage 7 and an input of a reception low noise amplifier stage 5 are integrated by a transmission reception branching filter 1 and an input of a transmission high output amplifier stage 8 and an output of a reception low noise amplifier stage 6 are integrated by another transmission reception branching filter 2, and the radio equipment is connected to externally by two common input output terminals 9,10 only. Moreover, the required attenuation to block the oscillation by a transmission reception amplifier closed loop is shared by an inter-stage filters such as a reception filter 3 and a transmission filter 4 to reduce the share of the attenuation to the transmission reception branching filter 1 and to reduce the loss thereby high output transmission and low noise reception of the equipment.