Ricerc@Sapienza

This paper presents for the first time a theoretical proof that at certain frequencies it may be impossible to match a nonuniform multiconductor transmission line by terminating it with a multiport load network of only passive partial admittances. The analytical proof is based on a detailed modal analysis of the chain connection of two unequal uniform lossless line sections, each one made of two parallel wires above ground.

A technique for the open-stopband (OSB) suppression in one-dimensional (1-D) periodic leaky-wave antennas based on a double asymmetric series/shunt discontinuity inside the unit cell is discussed and applied to a canonical 2-D structure. A longitudinal equivalent network formalism is developed here to analyze the unit-cell matching, which confirms that the OSB suppression cannot be achieved using a double symmetric discontinuity.