1results about How to "Good Common Mode Rejection" patented technology

This invention discloses a miniaturized balanced-single-ended 180° hybrid coupler, belonging to the field of radio frequency and microwave technology. It includes: a stacked dielectric substrate, and a differential-end balanced feed unit, a symmetrical short-circuit stepped impedance ring, a center-loaded short-circuit stub, a sum-end balanced feed group, a first single-port, and a second single-port, all disposed within the dielectric substrate. The differential-end balanced feed unit and the symmetrical short-circuit stepped impedance ring are connected by a short circuit at one half to form two sets of wide-side coupled striplines, creating an anti-phase coupled transmission path. The sum-end balanced feed group and the center-loaded short-circuit stub at the symmetrical midpoint of the symmetrical short-circuit stepped impedance ring form a three-wire coupling, creating an in-phase coupled transmission path. The first and second single-ports are connected to two impedance transformation nodes of the symmetrical short-circuit stepped impedance ring for input / output of equal-amplitude in-phase or equal-amplitude out-of-phase single-ended signals. This invention integrates balanced-single-ended conversion, broadband filtering, high common-mode rejection, and compact packaging into a single unit.