During the station's transmission/reception mode, this device is fully transparent and is not involved in the transmission of the signal of frequency fl or in the reception of the signal frequency f2. This device is interposed between the antenna 2 and the duplexer 6. Finally, in order to detect any malfunction in one of its elements, the station conventionally comprises a remote loop-back device 7 which, as it were, is a circuit for monitoring the operation of the station. In order for the antenna 2 to be used simultaneously for transmission and reception, the station furthermore has a duplexer 6. The working frequencies of these systems are respectively the frequencies fl and f2, of the order of thirty gigahertz. As indicated above, it has a transmission system 4 and a reception system 5. This station is connected to an antenna 2 via a waveguide 3. A terminal station 1 is represented in Figure 1. Since radio beams are two-directional, each of these stations has a reception system and a transmission system. Radio links are organized around terminal stations and relay stations. The application of the invention lies, more particularly, in the production of equipment for directional millimetre radio. The present invention relates to a remote loop-back device intended to frequency-transpose a microwave signal of frequency fl into a microwave signal of frequency f2. H03D9/0633- Transference of modulation using distributed inductance and capacitance by means of diodes mounted on a stripline circuit.H03D9/0608- Transference of modulation using distributed inductance and capacitance by means of diodes.H03D9/06- Transference of modulation using distributed inductance and capacitance.H03D9/00- Demodulation or transference of modulation of modulated electromagnetic waves.H03D- DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER.VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1.229910052904 quartz Inorganic materials 0.000 description 1.229920001343 polytetrafluoroethylene Polymers 0.000 description 1.

239000004810 polytetrafluoroethylene Substances 0.000 description 1.

238000006011 modification reaction Methods 0.000 description 1.

238000010521 absorption reaction Methods 0.000 description 4.

230000005540 biological transmission Effects 0.000 description 9.

238000004519 manufacturing process Methods 0.000 abstract description 2.

230000001902 propagating Effects 0.000 claims description 4.

230000017105 transposition Effects 0.000 claims abstract description 4.

Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from FR97/07964 external-priority Application filed by Trt Lucent Technologies (S.A.) filed Critical Trt Lucent Technologies (S.A.) Priority to US09/445,946 priority Critical patent/US6603963B1/en Priority to DE69801108T priority patent/DE69801108T2/en Priority to EP98936411A priority patent/EP0990304B1/en Publication of WO1998059415A1 publication Critical patent/WO1998059415A1/en Links Inventor Claude Boulic Original Assignee Trt Lucent Technologies (S.A.) Priority date (The priority date is an assumption and is not a legal conclusion.

Loop back device