As type acceptance important matter is made secure, in the RF system the system which improves the ability of the device

摘要

(57) Abstract Transmission of the RF signal by the communication system and/or it is the question system which enables reception. According to this invention, with the transmitter and the antenna, the tranceiver through the antenna, before transmitting or receiving, or, question is executed the RF signal. This question is used although it judges, whether or not the power which is required by the tranceiver and/or the antenna transmits or receives the RF signal which possesses frequency zone. This question is done by the device of the question side which transmits the question signal to the device of other response side. The device of response side, responding to the reception of the question signal, transmits the response signal to the device of question side. It judges the device of question side, whether or not the response signal has had specified quality. When the response signal has had specified quality, transmission of the RF signal and/or reception enables. As another applications of this question, it is to identify it can use for the transmission or reception of the RF signal either one in the plural antennas which are connected to the tranceiver.