A millimeter wave microstrip, high reverse loss isolator is provided comprising a monolithic ferrite element disposed on one surface of a section of microstrip dielectric substrate having a ground plane on the opposite substrate surface. The ferrite element has a pair of right prism- shaped central portions each having three prism faces and two downwardly sloping transition arm portions extending radially outwardly from two of the prism faces. A bar shaped connecting arm portion interconnects the remaining prism faces of the pair of central portions. All of the top surfces of the ferrite element are covered with microstrip conductor and four sections of microstrip conductor are disposed on the surface of the substrate in alignment with the downwardly-sloping transition arm portions of the element. Permanent magnet biasing means mounted on the ground plane beneath the ferrite element central portions cause these portions to act as microstrip Y-junction circulators. The shared connecting arm portion of the element connects the circulators in tandem so that a four port (two ports terminated) high reverse loss isolator results.
展开▼
