High isolation cross-over for canceling mutually coupled signals between

Abstract

A stripline isolation cross-over is configured to cancel signals that may be mutually coupled at cross-over points between adjacent stripline networks within a compact multilayer signal distribution architecture, such as one feeding elements of phased array antennas, without a shielding layer between adjacent signal distribution networks. The signal distribution networks includes layers of stripline, patterned on opposite sides of a dielectric layer. Wherever the stripline layers mutually overlap, they are oriented at right angles to one another, and one of the striplines is configured as a pair of power dividers, connected back-to-back via stripline interconnect passing the other stripline layer, to form a signal splitting-recombining stripline pair. The locations where the sections of interconnect cross the second stripline are spaced apart by a half-wavelength of transported signals, so that any signal mutually coupled between the two striplines at each cross-over point will combine antiphase with itself, thereby effectively preventing mutual interference between the two networks.