US3622896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave signal-processing circuits, and particularly microwave fm discriminator
Assignee: Thales SA
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Filing: 1970-05-06
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Granted: 1971-11-23
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Expires: 1990-05-06
Abstract
Abstract A first hybrid circuit has a microwave signal applied thereto and has two signal component outputs, 90* out of phase with respect to each other. The hybrid circuit is interconnected to a second hybrid, in the form of a magic Tee, and delivers sum and difference signals of the inputs, which are then applied to a difference detector. The interconnection between the two hybrid circuits includes, in one line a ferromagnetic resonator located in a magnetic field set to the center frequency of the applied input signal to the first hybrid; upon deviation of the frequency of the input signal from the center, with the magnetic field constant, the second hybrid will develop sum and difference signals which can be detected, so that a frequency-varying signal is being analyzed. In an alternative, the input signal is kept at constant frequency and the magnetic field strength is varied, the change in the output signal than being indicative of variation of magnetic field strength.
Inventors
- 👤 George Pircher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:41
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/02; H03D9/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
Signal-processing circuit to transform characteristics of electrical signals, varying about a center value, into other signals, having a similar variation comprising a first hybrid microwave circuit (3) connected to have a microwave signal (AF) applied thereto, said first hybrid circuit splitting said microwave signal into two signal components (a; -ja) 90* out of phase with respect to each other; a second hybrid circuit (8) having the signal components from said first hybrid circuit applied thereto and being connected to deliver an output forming the sum and differences of the input signals to the second hybrid circuit; a pair of circuits (4, 5) interconnecting said signal components between said first and second hybrid circuit; and a ferromagnetic resonator means (1, 2) located in a magnetic field (H), the field strength of said field for the resonator being selectable with respect to the center frequency of said microwave signal, said ferromagnetic resonator being inserted in one of the interconnecting circuits of said pair.
Claim 2
Dependent Claim
161 words
Signal-processing circuit to transform characteristics of electrical signals, varying about a center value, into other signals, having a similar variation comprising a first hybrid microwave circuit (3) connected to have a microwave signal (AF) applied thereto, said first hybrid circuit splitting said microwave signal into two signal components (a; -ja) 90* out of phase with respect to each other; a second hybrid circuit (8) having the signal components from said first hybrid circuit applied thereto and being connected to deliver an output forming the sum and differences of the input signals to the second hybrid circuit; a pair of circuits (4, 5) interconnecting said signal components between said first and second hybrid circuit; and a ferromagnetic resonator means (1, 2) located in a magnetic field (H), the field strength of said field for the resonator being selectable with respect to the center frequency of said microwave signal, said ferromagnetic resonator being inserted in one of the interconnecting circuits of said pair.
Claim 3
Dependent Claim
19 words
Circuit according to claim 1 including a difference detector (11) connected to the output of the second hybrid circuit.
Claim 4
Dependent Claim
42 words
Circuit according to claim 1 wherein the interconnecting circuits comprise a pair of identical circulators (4, 5), the ferromagnetic resonator (1) being connected to one (5) of the circulators; and wave reflection means (7) connected to the other (4) of the circulators.
Claim 5
Dependent Claim
30 words
Circuit according to claim 3 wherein the wave reflection means comprises a terminAting element (7) having a reflection factor of about unity without introducing a substantial phase or frequency shifts.
Claim 6
Dependent Claim
17 words
Circuit according to claim 1 wherein the ferromagnetic resonator is a sphere (1) of yttrium iron garnet.
Claim 7
Dependent Claim
24 words
Circuit according to claim 1 wherein the first hybrid circuit (3) is a 3db. coupler; and the second hybrid circuit is a magic Tee.
Claim 8
Dependent Claim
47 words
Circuit according to claim 1 for use as a frequency detector, wherein the electrical characteristic is an excursion of frequency of the microwave signal; and said magnetic field affecting the ferromagnetic resonator (1) is selected to polarize the resonator at the center frequency of the microwave signal.
Claim 9
Dependent Claim
48 words
Circuit according to claim 1 wherein said ferromagnetic resonator includes means (16, 17) generating an adjustable magnetic field (H); and means controlling the intensity of said magnetic field and setting said intensity to provide for resonance of said ferromagnetic resonator at the center frequency of the microwave signal.
Claim 10
Dependent Claim
42 words
Circuit according to claim 8 including a feedback loop (11, 19) interconnecting the output from said second hybrid circuit (8) and means generating an adjustable magnetic field and connected to control the field strength about the center frequency of the microwave signal.
Claim 11
Dependent Claim
91 words
Circuit according to claim 8 wherein the variation about the center value of field strength (HO) of the magnetic field (H) polarizing the ferromagnetic resonator is to be analyzed; said first hybrid circuit (3) has a signal of predetermined microwave frequency (Fo) applied thereto and said means generating said magnetic field (17, 16) is preset (18) to provide a field (Ho) polarizing said resonator to said predetermined frequency; the output from said second hybrid circuit (8) being indicative of variation of magnetic field polarizing said ferromagnetic resonator, about said center value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |