Abstract: A two-element slot line array antenna comprises a substrate having a first and a second main surface, a conductor disposed on the first main surface, a slot line formed in the conductor, and a pair of slot line antenna elements formed in the conductor. The slot line has one end side electromagnetically coupled to the pair of antenna elements, and the other end side serving as a feed end. The pair of antenna elements is arranged in parallel with an electric field plane or a magnetic field plane formed by the slot line. The pair of antenna elements and the slot line are arranged in mirror symmetry with respect to a magnetic field plane or electric field plane which starts at the feed end, so that the pair of antenna elements is excited in phase.

Abstract: A high frequency oscillator suitable for implementing a push-push oscillator, a push-pull oscillator, and a four-phase push-push oscillator comprises a transmission line resonator, two active devices for oscillation connected to two resonant wave points, respectively, located on the transmission line resonator in an opposite phase relationship to each other, and a combiner line connected to an electric symmetric point of the transmission line resonator. The respective active devices constitute two oscillation systems, respectively, which share the transmission line resonator as a high frequency resonator. The combiner line combines outputs from the respective oscillation systems to generate a high frequency output.