shield wherein the first interconnection and the second interconnection are separated by one or more of the ground parts for electromagnetic shield application_number US 54316006 A description hereinafter the present invention will be described in more detail using preferred embodiments the accompanying drawings are used in the description to ease understanding of the present invention fig1 shows a configuration of a radio frequency power amplifier circuit in a first embodiment the radio frequency power amplifier circuit comprises an input impedance matching circuit 1 an input stage transistor 10 for power amplification an inter stage impedance matching circuit 2 an output stage transistor 11 for power amplifier an output impedance matching circuit 3 and a base bias voltage control circuit 20 for transistors 10 and 11 wherein the base bias voltage control circuit 20 in this circuit comprises the transistors 12 and 13 and resistors 30 and 31 the radio frequency power amplifier circuit comprises a first terminal 40 for supplying a voltage for collector driving to the output stage transistor 11 a second terminal 41 for supplying a voltage for collector driving to the transistors 12 and 13 making up the base bias voltage control circuit 20 a third terminal 42 for supplying a current and a voltage for gain control to the transistors 12 and 13 making up the base bias voltage control circuit 20 a signal input terminal 43 for inputting a signal to the base of the input stage transistor 10 a signal output terminal 44 for extracting a signal from the collector of the output stage transistor.