| 摘要 |
The circuit includes at least one switch (23.X) which comprises at least one device for decoupling transmission- and reception signals, at least one device for selecting frequencies of the transmission- and reception signals, and at least one high frequency conductor with an electric length of lambda /4. The at least one switch comprises a coupler (11.X) on a conductor of an antenna input/output (16) to a power amplifier (2.X). An lambda /4 high frequency conductor (3.X.2) which is connected directly with ground, or an lambda /2 high frequency conductor are provided on the conductor between antenna input/output and coupler. At least one lambda /4 high frequency conductor (3.X.1) is provided between the power amplifier and the coupler, which is short-circuited or open at one end, and which is connected in series with an HF switch (4.X.1) connected with ground. A conductor to an RX output (14.X) with at least one HF switch (4.X.2) connected in series, is provided between the lambda /4 or lambda /2 high frequency conductor and the antenna input/output. |
