A DRO-based X-band injection-locked amplifier without input non-reciprocal elements

Conventional design of injection-locked amplifiers (ILA´s) implies the use of a non-reciprocal (ferrite, usually) element for separating the input signal from the synchronized output signal. In this paper a novel topological structure is proposed which permitted the realization of a wide-band, transmission-type, ILA with no need for separating input-port isolator or preamplifier. The prototype, realized in HMIC technology, while intended only as demonstrator of the newly proposed approach in the design of ILA´s, shows quite satisfactory performances at X-band, with a simple, compact and low-cost structure.