| 摘要 |
1. A level-measuring device comprising a signal generating device for generating both a radio-frequency transmit signal and a sampling control signal for sampling the radio-frequency signal, a transmitting and/or receiving device and a sampling device, controlled by the sampling control signal, for sampling the radio-frequency signal, the signal generating device, the transmitting and/or receiving device and the sampling device being connected by a coupling device which comprises a transformer. 2. A level-measuring device comprising a signal generating device for generating both a radio-frequency transmit signal and a sampling control signal for sampling the radio-frequency signal, a transmitting and/or receiving device and a sampling device, controlled by the sampling control signal, for sampling the radio-frequency signal, the signal generating device, the transmitting and/or receiving device and the sampling device being connected by a coupling device which comprises at least one line node. 3. A level-measuring device comprising a signal generating device for generating both a radio-frequency transmit signal and a sampling control signal for sampling the radio-frequency signal, a transmitting and/or receiving device and a sampling device, controlled by the sampling control signal, for sampling the radio-frequency signal, the signal generating device, the transmitting and/or receiving device and the sampling device being connected by a coupling device which comprises a λ/4 coupler. 4. The level-measuring device as claimed in claim 3, in which the λ/4 coupler is a Wilkinson coupler. 5. The level-measuring device as claimed in claim 3, in which the λ/4 coupler is a Lange coupler. 6. The level-measuring device as claimed in claim 3, in which the λ/4 coupler is a directional coupler. 7. The level-measuring device as claimed in claim 3, in which the λ/4 coupler is a line coupler. 8. The level-measuring device as claimed in claim 3, in which the λ/4 coupler is a coaxial line coupler. 9. The level-measuring device comprising a signal generating device for generating both a radio-frequency transmit signal and a sampling control signal for sampling the radio-frequency signal, a transmitting and/or receiving device and a sampling device, controlled by the sampling control signal, for sampling the radio-frequency signal, the signal generating device, the transmitting and/or receiving device and the sampling device being connected by a coupling device which comprises a circulator. 10. The level-measuring device as claimed in one of claims 1 to 9, in which the signal generating device comprises a comparator circuit which is used for delaying the sampling signal with respect to the radio-frequency transmit signal. 11. The level-measuring device as claimed in one of claims 1 to 9, in which the signal generating device comprises a beat oscillator circuit which is used for delaying the sampling signal with respect to the radio-frequency transmit signal. 12. The level-measuring device as claimed in one of claims 1 to 9, in which the signal generating device comprises a regulated delay circuit which is used for delaying the sampling signal with respect to the radio-frequency transmit signal. 13. The level-measuring device as claimed in one of claims 10 to 12, in which the sampling device comprises a diode ring circuit and a holding capacitor. 14. The level-measuring device as claimed in one of claims 10 to 12, in which the sampling device comprises at least one diode and one holding capacitor. 15. The level-measuring device as claimed in one of claims 10 to 12, in which the sampling device comprises a mixer circuit. 16. The level-measuring device as claimed in one of claims 1 to 12 or 15, in which the radio-frequency transmit signal is a burst signal. 17. The level-measuring device as claimed in one of claims 1 to 9, in which the sampling device comprises a diode ring circuit and a holding capacitor. 18. The level-measuring device as claimed in one of claims 1 to 9, in which the sampling device comprises at least one diode and one holding capacitor. 19. The level-measuring device as claimed in one of claims 1 to 9, in which the sampling device comprises a mixer circuit. 20. The level-measuring device as claimed in one of claims 17 to 19, in which the signal generating device comprises a comparator circuit which is used for delaying the sampling signal with respect to the radio-frequency transmit signal. 21. The level-measuring device as claimed in one of claims 17 to 19, in which the signal generating device comprises a beat oscillator circuit which is used for delaying the sampling signal with respect to the radio-frequency transmit signal. 22. The level-measuring device as claimed in one of claims 17 to 19, in which the signal generating device comprises a regulated delay circuit which is used for delaying the sampling signal with respect to the radio-frequency transmit signal. 23. The level-measuring device as claimed in one of claims 17 to 19, in which the radio-frequency transmit signal is a burst signal. |
