US4319244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short-range doppler radar
Assignee: Hitachi Ltd
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Filing: 1980-01-17
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Granted: 1982-03-09
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Expires: 2000-01-17
Abstract
Abstract In a Doppler radar system for measuring the velocity of a vehicle, such as an automobile, in order to lessen interference with external electric wave appliances, such as radios and televisions, caused by transmitting microwaves, one of the higher harmonics generated from a mixer diode driven by the fundamental waves of a local oscillator is selected by a filter for transmission and is used as the transmission output wave, whereby the power of the transmission waves is remarkably reduced in comparison with the mixer driving power.
Inventors
- 👤 Yukitsugu Hirota
- 👤 Yoichi Kaneko
- 👤 Kenji Sekine
- 👤 Akira Endo
- 👤 Katsuhiro Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:24
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/91; G01S13/92; G01S7/00; G01S7/02; G01S7/03; G01S7/032
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
97 words
A short-range Doppler radar comprising: (a) an oscillator; (b) a frequency multiplier device which is driven by an output of said oscillator and which forms a range of higher harmonic frequency components of a frequency of the oscillator output; (c) filter means for selecting one of the higher harmonic frequency components formed by said frequency multiplier device; (d) means for radiating the selected higher harmonic frequency component provided at the output of said filter means and for receiving reflected waves of the radiated component; and (e) means for detecting the Doppler frequency in the received reflected waves.
Claim 2
Dependent Claim
97 words
A short-range Doppler radar comprising: (a) an oscillator; (b) a frequency multiplier device which is driven by an output of said oscillator and which forms a range of higher harmonic frequency components of a frequency of the oscillator output; (c) filter means for selecting one of the higher harmonic frequency components formed by said frequency multiplier device; (d) means for radiating the selected higher harmonic frequency component provided at the output of said filter means and for receiving reflected waves of the radiated component; and (e) means for detecting the Doppler frequency in the received reflected waves.
Claim 3
Dependent Claim
82 words
A short-range Doppler radar according to claim 1, wherein a dielectric substrate which forms a micro-integrated circuit including said frequency multiplier device and a micro strip line for coupling the output of said oscillator to said frequency multiplier device is mounted on an inner wall of a metallic package, and said filter means is made up of a window provided in said dielectric substrate and the adjacent wall of said metallic package and a waveguide coupling said window and said radiating means.
Claim 4
Dependent Claim
19 words
A short-range Doppler radar according to claims 1 or 2, wherein said frequency multiplier device is a mixer diode.
Claim 5
Dependent Claim
26 words
A short-range Doppler radar according to claims 1 or 2, wherein said oscillator and said frequency multiplier device are unitarily constructed of a single Gunn diode.
Claim 6
Dependent Claim
50 words
A short-range Doppler radar according to claim 1, wherein said filter means includes a narrow band filter capable of passing a higher harmonic frequency component equal to nfo, where fo is the frequency of the oscillator output and n is an integer in the range of 2 to 5 inclusive.
Claim 7
Dependent Claim
16 words
A short-range Doppler radar according to claim 1, wherein said radiating means is a horn antenna.
Claim 8
Dependent Claim
17 words
A short-range Doppler radar according to claims 1 or 2, wherein said oscillator comprises a Gunn diode.
Claim 9
Dependent Claim
68 words
A short-range Doppler radar comprising microwave signal generating means for generating a fundamental frequency signal and a range of higher harmonic frequency components thereof; filter means connected to said signal generating means for passing only a selected harmonic frequency component; antenna means for radiating said selected harmonic frequency component and for receiving reflected waves thereof; and means for detecting the Doppler frequency component in the received reflected waves.
Claim 10
Dependent Claim
68 words
A short-range Doppler radar comprising microwave signal generating means for generating a fundamental frequency signal and a range of higher harmonic frequency components thereof; filter means connected to said signal generating means for passing only a selected harmonic frequency component; antenna means for radiating said selected harmonic frequency component and for receiving reflected waves thereof; and means for detecting the Doppler frequency component in the received reflected waves.
Claim 11
Dependent Claim
98 words
A short-range Doppler radar comprising microwave signal generating means for generating a fundamental frequency signal and a range of higher harmonic frequency components thereof; filter means connected to said signal generating means for passing only a selected harmonic frequency component; antenna means for radiating said selected harmonic frequency component and for receiving reflected waves thereof; means for detecting the Doppler frequency component in the received reflected waves, and a dielectric substrate having a metallic layer on one side thereof and having a micro-integrated circuit formed on the other side thereof, which circuit comprises said microwave signal generating means.
Claim 12
Dependent Claim
98 words
A short-range Doppler radar comprising microwave signal generating means for generating a fundamental frequency signal and a range of higher harmonic frequency components thereof; filter means connected to said signal generating means for passing only a selected harmonic frequency component; antenna means for radiating said selected harmonic frequency component and for receiving reflected waves thereof; means for detecting the Doppler frequency component in the received reflected waves, and a dielectric substrate having a metallic layer on one side thereof and having a micro-integrated circuit formed on the other side thereof, which circuit comprises said microwave signal generating means.
Claim 13
Dependent Claim
30 words
A short-range Doppler radar according to claim 9, wherein said filter means comprises a window provided in said dielectric substrate and a waveguide coupling said window to said antenna means.
Claim 14
Dependent Claim
51 words
A short-range Doppler radar according to claim 9, wherein said filter means includes a narrow band filter capable of passing a higher harmonic frequency component equal to nfo, where fo is the frequency of said fundamental frequency signal and n is an integer in the range of 2 to 5 inclusive.
Claim 15
Dependent Claim
35 words
A short-range Doppler radar according to claim 11, wherein said window is dimensioned to pass frequencies in a range of n·fo and below, and said waveguide is dimensioned to pass frequencies of nfo and above.
Claim 16
Dependent Claim
40 words
A short-range Doppler radar according to claim 8, wherein said microwave signal generating means comprises an oscillator generating said fundamental frequency signal and a frequency multiplier device connected to said oscillator for generating said range of higher harmonic frequency components.
Claim 17
Dependent Claim
17 words
A short-range Doppler radar according to claim 13, wherein said frequency multiplier device is a mixer diode.
Claim 18
Dependent Claim
19 words
A short-range Doppler radar according to claim 9, wherein said microwave signal generating means comprises a single Gunn diode.
Claim 19
Dependent Claim
104 words
A short-range Doppler radar comprising an oscillator which generates a fundamental frequency wave; a mixer diode which is driven by an output of said oscillator and generates a range of higher harmonic frequency components of said fundamental frequency wave and mixes said fundamental frequency wave with received reflected waves; filter means for passing only a selected harmonic frequency component of the output generated by said mixer diode; antenna means coupled to said mixer diode for radiating said selected harmonic frequency component and for receiving reflected waves thereof; and means connected to said mixer diode for selecting the Doppler frequency in the received reflected waves.
Claim 20
Dependent Claim
104 words
A short-range Doppler radar comprising an oscillator which generates a fundamental frequency wave; a mixer diode which is driven by an output of said oscillator and generates a range of higher harmonic frequency components of said fundamental frequency wave and mixes said fundamental frequency wave with received reflected waves; filter means for passing only a selected harmonic frequency component of the output generated by said mixer diode; antenna means coupled to said mixer diode for radiating said selected harmonic frequency component and for receiving reflected waves thereof; and means connected to said mixer diode for selecting the Doppler frequency in the received reflected waves.
Claim 21
Dependent Claim
42 words
A short-range Doppler radar according to claim 16, including a dielectric substrate having a metallic layer on one side thereof and a micro-integrated circuit formed on the other side thereof, which circuit at least comprises said mixer diode and said selecting means.
Claim 22
Dependent Claim
30 words
A short-range Doppler radar according to claim 17, wherein said filter means comprises a window provided in said dielectric substrate and a waveguide coupling said window to said antenna means.
Claim 23
Dependent Claim
54 words
A short-range Doppler radar according to claim 17, wherein said filter means includes a narrow band filter capable of passing a higher harmonic frequency component equal to n·f o , wherein f o is the frequency of said fundamental frequency wave and n is an integer in the range of 2 to 5 inclusive.
Claim 24
Dependent Claim
40 words
A short-range Doppler radar according to claim 18, wherein said window is dimensioned to pass frequencies in a range of n·f o and below, and said waveguide is dimensioned to pass frequencies in a range of n·f o and above.
Claim 25
Dependent Claim
16 words
A short-range Doppler radar according to claim 17, wherein said mixer diode is a Gunn diode.
Claim 26
Dependent Claim
92 words
A short-range Doppler radar comprising generating means including a diode for generating a fundamental frequency wave and a range of higher harmonic frequency components of said fundamental frequency wave and for mixing said fundamental wave with received reflected waves; filter means for passing only a selected harmonic frequency component of the waves generated by said generating means; antenna means coupled to said diode for radiating said selected harmonic frequency component and for receiving reflected waves thereof; and means connected to said diode for selecting the Doppler frequency in the received reflected waves.
Claim 27
Dependent Claim
92 words
A short-range Doppler radar comprising generating means including a diode for generating a fundamental frequency wave and a range of higher harmonic frequency components of said fundamental frequency wave and for mixing said fundamental wave with received reflected waves; filter means for passing only a selected harmonic frequency component of the waves generated by said generating means; antenna means coupled to said diode for radiating said selected harmonic frequency component and for receiving reflected waves thereof; and means connected to said diode for selecting the Doppler frequency in the received reflected waves.
Claim 28
Dependent Claim
38 words
A short-range Doppler radar according to claim 22, including a dielectric substrate having a metallic layer on one side thereof and a micro-integrated circuit formed on the other side thereof, which circuit at least comprises said selecting means.
Claim 29
Dependent Claim
27 words
A short-range Doppler radar according to claim 23, wherein said filter means comprises a window provided in said dielectric substrate and a waveguide connected to said window.
Claim 30
Dependent Claim
55 words
A short range Doppler radar according to claim 23, wherein said filter means includes a narrow band filter capable of passing a higher harmonic frequency component equal to n·f o , where f o is the frequency of said fundamental frequency wave and n is an integer in the range of 2 to 5 inclusive.
Claim 31
Dependent Claim
15 words
A short-range Doppler radar according to claim 23, wherein said diode is a Gunn diode.
Claim 32
Dependent Claim
79 words
A short-range Doppler radar comprising microwave signal generating means for generating a fundamental frequency signal and a range of higher harmonic frequency components thereof; filter means connected to said signal generating means for passing only a selected harmonic frequency component; antenna means for radiating said selected harmonic frequency component and for receiving reflected waves thereof; means for detecting the Doppler frequency component in the received reflected waves, and wherein said microwave signal generating means comprises a single Gunn diode.
Claim 33
Dependent Claim
79 words
A short-range Doppler radar comprising microwave signal generating means for generating a fundamental frequency signal and a range of higher harmonic frequency components thereof; filter means connected to said signal generating means for passing only a selected harmonic frequency component; antenna means for radiating said selected harmonic frequency component and for receiving reflected waves thereof; means for detecting the Doppler frequency component in the received reflected waves, and wherein said microwave signal generating means comprises a single Gunn diode.
References Cited (Backward Citations)
US4217585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-08 | 1985-09-07 | 1986-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-08 | 1989-09-07 | 1990-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-08 | 1993-09-07 | 1994-03-09 | $7700.00 | Window Closed / Lapsed |