| 主权项 |
1. A directional coupler for forward coupling energy from an input port to a coupled port, the directional coupler having a coupling factor, an operating frequency, and an operating wavelength corresponding to the operating frequency, the directional coupler comprising:
a first transmission line having the input port, a through port, and a first coupling section; and a second transmission line having an isolated port, the coupled port, and a second coupling section, wherein the first coupling section is located at a first position and the second coupling section is located at a second position, which is located proximate to the first position, wherein a spacing between the first position and second position define a gap spacing between the first coupling section and the second coupling section, wherein the isolated port is located closer to the input port than the coupled port is located to the input port, wherein the gap spacing is configured to minimize a transfer of energy from the input port to the isolated port, wherein the first coupling section has a first length and the second coupling section has a second length, wherein the second length is longer than a wavelength of the operating wavelength, and wherein the second length is predetermined to produce a transfer of energy from the input port to the coupled port that corresponds to the coupling factor. |
