A communication apparatus including a radio frequency circuit module can be reduced in the number of components therefor to reduce the cost for its components and to simplify its fabrication process and thus reduce the cost for manufacturing the same while the RF circuit module can also be shielded reliably. The test device has an electron collector plate conformed as an array of individually addressable electrodes, able to be taken to a positive or negative potential in order to carry out an injection or an extraction of electrons. A voltage of the gate of the power source switching transistor is made changing in an amplitude greater than an amplitude of an input and an output signal to the logic gate. A quasi-hermetically sealed space, which is the extinguishing space, is formed by the enclosing component and a first yoke.