A research of Quasi optical ferrite reflection isolator

Quasi-optical isolator in the Quasi-optical system plays a role to separate the sending and receiving signals. It has important effect to the system performance. This paper focuses on the compare transmission-type with reflection-type millimeterwave quasi-optical isolator. We have done experiment at 75-110G and 175-195G to analyze the match, bandwidth, insertion loss and isolation. Although the bandwidth of the reflection-type isolator is narrower than the transmission-type isolator, the reflection-type isolator has less insertion loss, and it avoid the problem of demagnetization. The change of Magnetic Bias means polarization rotation angle can be regulated. It also reduces the precision of magnetization and thinkness of ferrite plate.