Broadband dual-linearly-polarized or dual-circularly-polarized feed source

The invention discloses a broadband dual-linearly-polarized or dual-circularly-polarized feed source in the fields of wireless communication and radio astronomy. The broadband feed source consists of four groups of radiation oscillators, 2 impedance-matched printed boards and a circularly-polarized electric bridge, wherein the radiation oscillators are log periodic dipole arrays, and are connected with the two impedance-matched printed boards which are orthogonally arranged, so that impedance values of the wide ends of metal microstrip lines of the impedance-matched printed boards are 1/4 of impedance values between left and right pins of the radiation oscillators, so that feeding is simplified, and high performance is achieved. The broadband feed source is simple and compact in structure, low in feed loss and machining cost, high in feed efficiency and particularly applicable to a feed network of a feed source or antenna working under a broadband dual-linear-polarization or dual-circular-polarization application condition.