On the Transformerless Synthesis of Reactance Two-Ports of Degree Four or Less

This paper deals with the transformerless synthesis of reactive immittance matrices that are compact and whose elements are of degree four or less. In reference to the well-known necessary condition for transformerless networks, it is shown that there exist transformerless equivalent networks for the Darlington section, the cascade of two Brune sections with attenuation poles on the real and imaginary axes, and the cascade of two Brune sections with attenuation poles on the imaginary axis. These results are applied to transformerless one-port synthesis.