Microwave systems for eliminating spurious signals from pulsed source
AssigneeC.G.R. MeV
InventorsAndre Bensussan, Claude Levaillant
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Abstract
Selective transmission systems for transmitting from an H.F. generator to a load device whose electrical characteristics may vary rapidly, a pulsed main H.F. signal of given frequency, and for eliminating the spurious signal or signals accommpanying the main H.F. signal at the beginning of the pulse, when the load impedance presented to the H.F. generator is not suitable. Several embodiments are described which take account of the frequency of the spurious signals in relation to the frequency of the main signal.
Claims7
A selective transmission system for transmitting pulsed H.F. signals emitted by an H.F. generator and designed for injection into a load device, said H.F. generator being capable of emitting a first signal known as the main signal, of given frequency, and at least one second signal which is a spurious signal, said selective transmission system comprising means for eliminating said spurious signal and selectively transmitting to said load device said first signal and further means for presenting to the H.F. generator a matched load impedance throughout the time of the pulse, said further means comprising at least an hyperfrequency unidirectional element of the isolator type, said selective transmission system further comprising at least a three-channel junction having a first channel receiving said signals of frequency f.sub.1 (main signal) and f.sub.2 (spurious signal) emitted by said generator, a second channel which is equipped at its end with a microwave absorber and means for the selective transmission of the spurious signal of frequency f.sub.2 to said absorber, and a third channel which is provided with a band-pass filter centered on said main frequency f.sub.1, and with said hyperfrequency unidirectional element centred on said main frequency f.sub.1, said third channel being connected to said load device, said second channel being constituted by a waveguide which is a cut-off waveguide in relation to said main signal.
A selective transmission device for transmitting pulsed H. F. signals emitted by an H. F. generator and designed for injection into a load device, said H. F. generator being capable of emitting a first signal known as the main signal, of given frequency, and at least one second signal which is a spurious signal, said selective transmission system comprising means for eliminating said spurious signal and selectively transmitting to said load device said first signal and further means for presenting to the H. F. generator a matched load impedance throughout the time of the pulse, said further means comprising at least an hyperfrequency unidirectional element of the isolator type centered on said frequency f.sub.1, said selective transmission system further comprising at least a three-channel junction having a first channel receiving said signals of frequency f.sub.1 (main signal) and f.sub.2 (spurious signal) emitted by said generator, a second channel which is equipped at its end with a microwave absorber and means for the selective transmission of the spurious signal of frequency f.sub.2 to said absorber, said second channel being further provided with matching means for modifying the load impedance of said generator, said matching means being constituted by metal obstacles arranged in said waveguide of said second channel, in a direction which is parallel to the electric field in said waveguide, and a third channel provided with a band-pass filter centered on said main frequency f.sub.1, said third channel being connected to said load device, and a further unidirectional element of the circulator type connected to said unidirectional element of the H. F. isolator type.
Dependencies are inferred from the claim text.