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Abstract
In 1948 a new circuit element called the “Gyrator” was proposed by B. D. H. Tellegen. Many circuit properties of the gyrator have been worked out in the subsequent years. The gyrator is essentially a passive, linear element that does not obey the principle of reciprocity. This article considers the attenuation and image impedance characteristics of four-terminal networks using non-reciprocal elements and shows that in networks incorporating gyrators it is possible to realize finite attenuation in one direction and infinite attenuation in the other.