Single-mode tunable oscillator using magnetostatic waves
AssigneeThomson-CSF
InventorJean P. Castera
Life of this patent
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Abstract
An oscillator including two magnetostatic wave delay lines of different lengths formed on the surface of a magnetic material, one of whose ends is common and made by a first microstrip coupler, each of the other ends being made of a second and a third microstrip couplers respectively. The two lines are looped by means of a single amplifier. By selecting the two lengths, it is possible to obtain the desired interval between modes in such a way that there is a single oscillation mode comprised in the pass-band of the strips, in a pre-determined tuning band. This oscillator operates in the microwave range.
Claims6
A single-mode tunable oscillator comprising:
- amplifier means having an input and an output,
- two magnetostatic wave delay lines providing different delays and interconnected in feedback loops from said output to said input, said lines being made in a magnetic material arranged in a layer formed between short-circuited input and output strip couplers deposited on said layer,
- electromagnetic means simultaneously subjecting said two lines to an external magnetic field,
- extracting means for extracting a fraction of the electric signal present at said output, the frequency f of said signal being varied by variation of the intensity of said magnetic field.
Dependencies are inferred from the claim text.