Abstract: Disclosed is a novel topology of monolithic, microwave amplifiers with high integration. This is a more compact topology, divided into a two-level or tree-like structure in which the division of the input signal is done firstly on each transistor Tij and, secondly, on each of the elementary transistors tijk of the transistors Tij. More specifically, the input line LE is divided into different basic lines li, each line li supplying lines lij distributed on either side of said lines li, a line lij then supplying a power transistor Tij. Application to microwave amplifiers.

Abstract: The invention pertains to a doubling oscillator with low noise in the vicinity of the carrier frequency. The doubling oscillator of the invention is of the "push-push" type comprising two parallel-mounted transistors. The gates of these two transistors have a common oscillating circuit comprising two microstrip lines, two resistors and a common dielectric resonator positioned between the two microstrip lines. To reduce the low-frequency noise in the vicinity of the carrier near the load, the non-correlated low frequency noise sources of the transistors are either placed in series by means of a choke and two capacitances mounted at the ends of the microstrips or loaded at an infinite impedance through two capacitances mounted at the ends of the microstrips. This oscillator has applications in ultra-high frequency systems, radars and telecommunications.

Abstract: An oscillator of the "three-terminal" type, comprising for example a field effect transistor, having a narrow spectrum and electronically tunable within a very wide frequency band in spite of its narrow spectrum due to a resonator of the yttrium garnet ball type. The field effect transistor has its source connected to a dipole comprising an electronically variable reactance and its gate connected to a similar dipole. A feedback loop is also established between input and output circuits of the oscillator. Under the action of a single command, acting for example on a magnetic field, the reactances vary simultaneously. In one embodiment, a single yttrium garnet ball resonator has two conductive half loops inserted in the tuning dipole and coupling dipole of the oscillator.