Patent ID: 7157986
Filing Date: 2007-01-02
Classification: H01P

Abstract:
1. A three-dimensional balun, comprising: multiple conductor layers made of metal material and having a dielectric substrate layer interposed between every two conductor layers, where each conductor layer includes a circuit topology, and the dielectric substrate layers are planar plates, wherein the conductor layers are in transmission line configuration, in such a way that the first conductor layer includes first and second transmission lines, a first terminal, and a second terminal; the second conductor layer includes third and fourth transmission lines; the third conductor layer includes a ground electrode and a fifth terminal; the fourth conductor layer includes fifth and sixth transmission lines, and a third terminal; and the fifth conductor layer includes seventh and eighth transmission lines, and a fourth terminal; and the sixth conductor layer is a ground electrode; the three-dimensional balun characterized in that one end of the first transmission line is connected to one end of the fifth transmission line through a via core, passing through multiple interlayer dielectric substrates in between, while another end of the first transmission line is connected to the fourth terminal through a via core, passing through interlayer dielectric substrates in between, where these two via cores are not connected to the third and sixth conductor layers; one end of the third transmission line is connected to one end of the fifth terminal through a via core, passing through multiple interlayer dielectric substrates in between, while another end of the third transmission line is connected to one end of the seventh transmission line through a via core, passing through interlayer dielectric substrates in between, where these two via cores joining two ends of the seventh transmission line are not connected to the third and sixth conductor layers; one end of the second transmission line is connected to one end of the sixth transmission line through a via core, passing through interlayer dielectric substrates in between, while another end of the second transmission line is connected to the fourth terminal through a via core, passing through interlayer dielectric substrates in between, where these two via cores are not connected to the third and sixth conductor layers; one end of the fourth transmission line is connected to the fifth terminal through a via core, passing through interlayer dielectric substrates in between, while another end of the fourth transmission line is connected to one end of the eighth transmission line through a via core, passing through interlayer dielectric substrates in between, where these two via cores disposed on two ends of the eighth transmission line are not connected to the third and sixth conductor layers; the first and third transmission lines, the fifth and seventh transmission lines, the second and fourth transmission lines, and the sixth and eight transmission lines form pairs of coupling lines respectively; and one end of the sixth transmission line being defined as the third terminal is to be an input port, passing through interlayer dielectric substrates, where the input port and the via core are not connected to the third and sixth conductor layers.