Abstract: A radio-frequency circuit includes an antenna connection terminal, switch circuits, a duplexer, a low-pass filter, and a high-pass filter. The switch circuit includes a port connected to the antenna connection terminal and ports. The switch circuit includes a single transmission port connected to the port, a simultaneous transmission port connected to ports. The duplexer is connected to the port. The low-pass filter is disposed on a signal path connecting the port and the simultaneous transmission port. The high-pass filter is connected to the port. No filter is disposed on a signal path connecting the port and the single transmission port.

Abstract: The present invention is characterized by the following. Data for administrating equipment and measurement results are prepared prior to measurement of the prescribed input signal, measurement files consisting of measurement results are prepared and recorded on a storage medium during measurement, and a digital signature is affixed to these files after measurement. These characteristics enable the data to be handled as official data enabling restriction of access to the equipment and measurement data, operation logs and records of measurement conditions, and writing of signatures.