Manufacturing method of 10MHz-678MHz small-size directional coupler

The invention discloses a manufacturing method of a 10MHz-678MHz small-size directional coupler, and belongs to the technical field of directional couplers, the method comprises the following steps: layout of a PCB (Printed Circuit Board): the PCB is provided with two layers, and each layer of the PCB is grounded through a large area; directional couplers arranged on the PCB are arranged in a bilateral symmetry manner, and four inductors are wound on a double-hole magnetic core and are fixed on the PCB; a large number of grounding through holes are adopted in the PCB, the grounding effect is improved, the directional couplers arranged on the PCB are arranged in a bilateral symmetry mode, stray capacitance and inductance generated by a left bonding pad and a right bonding pad are equal, and later product manufacturing is facilitated; and a double-hole magnetic core is adopted, so that the size of the product is reduced by 10 * 7.6 * 5.1 mm. 本发明公开了一种10MHz~678MHz小尺寸定向耦合器的制造方法，属于定向耦合器技术领域，该方法为：PCB电路板布局：PCB电路板设置有两