ON-ROAD EQUIPMENT FOR RADIO COMMUNICATION BETWEEN ON-ROAD EQUIPMENTS HAVING VEHICLE DETECTION RADAR FUNCTION

摘要

PURPOSE:To attain simplicity and miniaturization by using a plane type print antenna for circularly polarized wave for two-terminal drive for both transmission and reception in common while a circularly polarized wave is used for all radio propagation in three operations of an on-road equipment so as to use a carrier oscillator in common in the three operations. CONSTITUTION:Two terminals A, B of the TEM two-terminal drive plane type circularly polarized wave print antenna 31 are connected to a hybrid circuit 32 and two terminals C, D of the hybrid circuit 32 are terminals from which circularly polarized waves having opposite rotatory directions are driven. A circulator 33 using the antenna in common for transmission/reception is connected to the drive terminal C and a radar wave receiver 34 is connected to the terminal D. A carrier oscillator 37 and a transmission modulator 36 are connected to a transmission port of the circulator 33, and an output of the carrier oscillator 37 is transmitted by pulse modulation by a transmission modulator 36 or by no modulation depending on the radar system. Further, the transmission port circuit is used entirely in common for two-way information communication between on-vehicle equipment.