RADAR DEVICE, CIRCULATOR FOR RADAR DEVICE, WAVEGUIDE TYPE FILTER FOR RADAR DEVICE AND MAGNETRON FOR RADAR DEVICE

摘要

PROBLEM TO BE SOLVED: To reliably suppress so-called second harmonic spurious to a low level. SOLUTION: Inside of the neighborhood of the first port to which the transmission part of a circulator 104 is connected, reactance elements 10a and 10b are arranged at a prescribed position from the center of a microwave ferrite 5 to generate resonance to the second harmonic of the basic wave frequency of magnetron. Thus, the transmission radio of a so-called -1 mode frequency is attenuated to lower the level of spurious radiation.