Patent ID: 8035389

Claim:
An RF switch device, comprising: at least four RF switch units, each RF switch unit comprising an output terminal and at least two input terminals, and said RF switch units being configured to select one channel of RF signals from among several channels of RF signals that are supplied as inputs to the respective input terminals for emission as an output from the respective output terminals; and said at least four RF switch units being divided into at least two stages, and each RF switch comprising one input terminal and two output terminals, in which the input terminal of the first-stage RF switch is used as the input terminal of said RF switch unit; at the various stages preceding the last stage, one output terminal of each RF switch is connected with a grounding resistance, the other output terminal and one output terminal of another RF switch at the same stage are jointly connected with the input terminals of the same RF switch at the next stage; one RF switch of the two RF switches connecting to the same RF switch at the next stage outputs the RF signal inputted into its input terminal to the RF switch at the next stage, another RF switch outputs the RF signal inputted into its input terminal to the grounding resistance, and if the number of the RF switches at the same stage is odd, the remaining RF switch operates as the RF switch at the next stage; at a last stage, the two output terminals of each RF switch are separately connected to the grounding resistance and the output terminal of said RF switch unit; one RF switch at the last stage outputs the RF signals input to its input terminal to the output terminal of said RF switch unit, and the other RF switch outputs the RF signals input to its input terminal to the grounding resistance.