US3859600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguide mixer
Assignee: International Standard Electric Corp
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Filing: 1973-10-25
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Granted: 1975-01-07
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Expires: 1993-10-25
Abstract
Abstract There is disclosed an evanescent mode waveguide mixer. A first length of evanescent mode waveguide is provided having one end coupled to a signal source and the other end coupled to a local oscillator. A resonant slot, either a longitudinal or a transverse resonant slot, is provided intermediate the two ends of the first length of waveguide so that the first length of waveguide between the resonant slot and the signal source constitutes an evanescent mode filter for coupling the signal of the signal source to the resonant slot and so that the first length of waveguide between the resonant slot and the local oscillator constitutes an evanescent mode filter for coupling the signal of the local oscillator to the resonant slot. A second length of waveguide is disposed at right angles to the first length of waveguide and disposed to receive energy through the resonant slot. A mixer diode is disposed in the second length of waveguide closely adjacent the resonant slot. The second length of waveguide is dimensioned to be evanescent at the mixer generated frequency and propagating at the mixer generated sum frequency. Reactance components are provided in the second length of waveguide beyond the mixer diode to provide independent adjustment to terminate the image and sum frequencies.
Inventors
- 👤 George Frederick Craven
- 👤 Raymond Richard Thomas
- 👤 Maurice Francis Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:22
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0616
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
224 words
A waveguide mixer arrangement comprising: a first waveguide, one end of which receives an input signal having a first given frequency and the other end of which receives a local oscillator signal having a second given frequency different than said first given frequency; a first resonant slot disposed in one wall of said first waveguide intermediate the ends thereof; said first waveguide including a first evanescent mode waveguide filter to couple sAid input signal to said first resonant slot, and a second evanescent mode waveguide filter to couple said local oscillator signal to said first resonant slot; a second waveguide coupled at right angles to said first waveguide encompassing said first resonant slot, said second waveguide being dimensioned to be evanescent at the mixer generated image frequency and propagating at the mixer generated sum frequency; a mixer diode disposed in said second waveguide adjacent to said first resonant slot; a capacitive obstacle disposed in said second waveguide a first given distance from said first resonant slot to provide within said second waveguide an evanescent mode resonator tuned to said image frequency so as to effect reactive termination of said image frequency; and a short circuit plate disposed in said second waveguide a second given distance greater than said first given distance from said first resonant slot to effect reactive termination of said sum frequency.
Claim 2
Dependent Claim
224 words
A waveguide mixer arrangement comprising: a first waveguide, one end of which receives an input signal having a first given frequency and the other end of which receives a local oscillator signal having a second given frequency different than said first given frequency; a first resonant slot disposed in one wall of said first waveguide intermediate the ends thereof; said first waveguide including a first evanescent mode waveguide filter to couple sAid input signal to said first resonant slot, and a second evanescent mode waveguide filter to couple said local oscillator signal to said first resonant slot; a second waveguide coupled at right angles to said first waveguide encompassing said first resonant slot, said second waveguide being dimensioned to be evanescent at the mixer generated image frequency and propagating at the mixer generated sum frequency; a mixer diode disposed in said second waveguide adjacent to said first resonant slot; a capacitive obstacle disposed in said second waveguide a first given distance from said first resonant slot to provide within said second waveguide an evanescent mode resonator tuned to said image frequency so as to effect reactive termination of said image frequency; and a short circuit plate disposed in said second waveguide a second given distance greater than said first given distance from said first resonant slot to effect reactive termination of said sum frequency.
Claim 3
Dependent Claim
49 words
An arrangement according to claim 1, further including a coaxial connector coupled to said second waveguide and said mixer diode; and a low pass filter contained in said connector to extract the desired intermediate frequency signal which is equal to said first given frequency minus said second given frequency.
Claim 4
Dependent Claim
26 words
An arrangement according to claim 2, wherein said first resonant slot includes an unloaded narrow slot disposed parallel to the longitudinal dimension of said first waveguide.
Claim 5
Dependent Claim
26 words
An arrangement according to claim 2, wherein said first resonant slot includes a dumb-bell shaped slot disposed parallel to the transverse dimension of said first waveguide.
Claim 6
Dependent Claim
97 words
An arrangement according to claim 2, further including a second resonant slot disposed in said one wall of said first waveguide adjacent said first resonant slot; a third waveguide coupled at right angles to said first waveguide parallel to said second waveguide encompassing said second resonant slot, said third waveguide being dimensioned to be evanescent at said second given frequency; and a capacitive obstacle disposed in said third waveguide a third given distance different than said first and second given distances from said resonant slot to provide an evanescent mode rejection filter for said second given frequency.
Claim 7
Dependent Claim
29 words
An arrangement according to claim 5, wherein said first and second resonant slots each include an unloaded narrow slot disposed parallel to the longitudinal dimension of said first waveguide.
Claim 8
Dependent Claim
29 words
An arrangement according to claim 5, wherein said first and second resonant slots each include a dumb-bell shaped slot disposed parallel to the transverse dimension of said first waveguide.
Claim 9
Dependent Claim
26 words
An arrangement according to claim 1, wherein said first resonant slot includes an unloaded narrow slot disposed parallel to the longitudinal dimension of said first waveguide.
Claim 10
Dependent Claim
26 words
An arrangement according to claim 1, wherein said first resonant slot includes a dumb-bell shaped slot disposed parallel to the transverse dimension of said first waveguide.
Claim 11
Dependent Claim
97 words
An arrangement according to claim 1, wherein a second resonant slot disposed in said one wall of said first waveguide adjacent said first resonant slot; a third waveguide coupled at right angles to said first waveguide parallel to said second waveguide encompassing said second resonant slot, said third waveguide being dimensioned to be evanescent at said second given frequency; and a capacitive obstacle disposed in said third waveguide a third given distance different than said first and second given distances from said second resonant slot to provide an evanescent mode rejection filter for said second given frequency.
Claim 12
Dependent Claim
29 words
An arrangement according to claim 10, wherein said first and second resonant slots each include an unloaded narrow slot disposed parallel to the longitudinal dimension of said first waveguide.
Claim 13
Dependent Claim
29 words
An arrangement according to Claim 10, wherein said first and second resonant slots each include a dumb-bell shaped slot disposed parallel to the transverse dimension of said first waveguide.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |