Duplex microwave radio system
Номер патента: CA1113155A
Опубликовано: 24-11-1981
Автор(ы): Friedbert Becker, Gunter Biethan, Peter Kloeber
Принадлежит: SIEMENS AG
Опубликовано: 24-11-1981
Автор(ы): Friedbert Becker, Gunter Biethan, Peter Kloeber
Принадлежит: SIEMENS AG
Реферат: ABSTRACT OF THE INVENTION DUPLEX MICROWAVE RADIO SYSTEM The invention concerns a duplex microwave radio system which serves to transmit analogue or digital data between mobile transmitting-receiving stations which move along given paths and fixed transmitting-receiving relay stations which are arranged at given intervals along these paths and operate in both directions of the path. The relay stations on a path are connected to a main, central transmitting-receiving station. Such systems are of use in, for example, railway systems. The invention provides that each mobile and/or relay station comprises a transmitting section including a microwave oscillator (3), frequency stabilisation and modulation means (4), and a receiving section including a microwave frequency-conversion mixer (5), an amplifier (6) and a demodulator, the output of the transmitting section and the input of the receiving section being connected to first and second arms of a circulator (7) having a third arm lying between the first two, the third arm being connected via a 3-dB coupler (8) to a pair of antennae means (9,10) whose radiation directions are offset by 180°, the arrangement being such that, in use, a signal from the microwave oscillator (3) passes, attenuated from the first to the second arm of the circulator (7) to provide a local oscillator signal for the mixer (5). (Figure 1)
Duplex microwave system and oscillator stabilization
Номер патента: AU4005378A. Автор: F. Breihan G. and Kloeker P Becker. Владелец: SIEMENS AG. Дата публикации: 1980-03-27.