A feed network device, comprising: two first stage couplers (601, 604; 701, 704), two phase shifters (605, 606; 705, 706), and two second stage couplers (602, 603; 702, 703) cascaded on a Printed Circuit Board, wherein each first stage couplers (601, 604; 701, 704) and second stage couplers (602, 603; 702, 703) is a multilayered dielectric broad-side coupler, and the difference of phase between an output signal at the coupling port and an output signal at the direct connection port is 90° in each multilayered dielectric broad-side coupler (601, 602, 603, 604; 701, 702, 703, 704); wherein an input port of each multilayered dielectric broad-side coupler in the first stage (601, 604; 701, 704) is a signal input port, and the other input port is connected with a matched load resistance; two output ports of each multilayered dielectric broad-side coupler in the second stage (602, 603; 702, 703) are signal output ports, wherein the two phase shifters are 45° phase shifters, wherein: the coupling port of the first multilayered dielectric broad-side coupler in the first stage (601; 701) is connected to an input port of the first multilayered dielectric broad-side coupler in the second stage (603; 702) via a 45° phase shifter (605; 705), the direct connection port of the first multilayered dielectric broad-side coupler in the first stage (601; 701) is connected directly to an input port of the second multilayered dielectric broad-side coupler in the second stage (602; 703); the coupling port of the second multilayered dielectric broad-side coupler in the first stage (604; 704) is connected to the other input port of the second multilayered dielectric broad-side coupler in the second stage (602; 703) via a 45° phase shifter (606; 706), and the direct connection port of the second multilayered dielectric broad-side coupler in the first stage (604; 704) is connected directly to the other input port of the first multilayered dielectric broad-side coupler in the second stage (603; 702); the feed network device being characterzied in that each multilayered dielectric broad-side coupler in the first stage (601, 604; 701, 704) is a multilayered dielectric broad-side coupler that provides output signals at unequal amplitude and each multilayered dielectric broad-side coupler in the second stage (602, 603; 702, 703) is a multilayered dielectric broad-side coupler that provides output signals at equal amplitude. the coupling port of the first multilayered dielectric broad-side coupler in the first stage (601; 701) is connected to an input port of the first multilayered dielectric broad-side coupler in the second stage (603; 702) via a 45° phase shifter (605; 705), the direct connection port of the first multilayered dielectric broad-side coupler in the first stage (601; 701) is connected directly to an input port of the second multilayered dielectric broad-side coupler in the second stage (602; 703); the coupling port of the second multilayered dielectric broad-side coupler in the first stage (604; 704) is connected to the other input port of the second multilayered dielectric broad-side coupler in the second stage (602; 703) via a 45° phase shifter (606; 706), and the direct connection port of the second multilayered dielectric broad-side coupler in the first stage (604; 704) is connected directly to the other input port of the first multilayered dielectric broad-side coupler in the second stage (603; 702); the feed network device being characterzied in that each multilayered dielectric broad-side coupler in the first stage (601, 604; 701, 704) is a multilayered dielectric broad-side coupler that provides output signals at unequal amplitude and each multilayered dielectric broad-side coupler in the second stage (602, 603; 702, 703) is a multilayered dielectric broad-side coupler that provides output signals at equal amplitude.