US3728730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting incident angle of radio wave
Assignee: Mitsubishi Electric Corp
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Filing: 1970-09-16
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Granted: 1973-04-17
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Expires: 1990-09-16
Abstract
Abstract An apparatus for detecting an incident angle of radio wave can find the incident angle of radio signal without mechanical motion of any of antennas or radiator elements. The radio signals received by the paired radiator elements are utilized to produce a sum and a difference signals, with the phase relationship between them changing with a magnitude of the incident angle. By using a combination of polarities of the sum and the difference signals, the incident angle can be detected in digital form.
Inventors
- 👤 K Takao
- 👤 M Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:57
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/46; G01S3/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
An apparatus for detecting an incident angle of a radio wave comprising, an antenna array including at least a pair of radiator elements by each of which said radio wave is received, means for generating a sum signal and a difference signal from said radio wave, each of said sum and difference signals having a positive or negative phase depending on a magnitude of said incident angle, a detection unit receiving said sum and difference signals and determining the magnitude of said incident angle in accordance with phase relations between said sum and difference signals, said detection unit comprising a first phasedetecting means for detecting a first signal based on said sum signal by a comparison signal, a second phase-detecting means for detecting a second signal based on said difference signal by said comparison signal, and a detector for determining a magnitude of said incident angle in accordance with a combination of outputs from said first and second phase-detecting means.
Claim 2
Independent Claim
160 words
An apparatus for detecting an incident angle of a radio wave comprising, an antenna array including at least a pair of radiator elements by each of which said radio wave is received, means for generating a sum signal and a difference signal from said radio wave, each of said sum and difference signals having a positive or negative phase depending on a magnitude of said incident angle, a detection unit receiving said sum and difference signals and determining the magnitude of said incident angle in accordance with phase relations between said sum and difference signals, said detection unit comprising a first phasedetecting means for detecting a first signal based on said sum signal by a comparison signal, a second phase-detecting means for detecting a second signal based on said difference signal by said comparison signal, and a detector for determining a magnitude of said incident angle in accordance with a combination of outputs from said first and second phase-detecting means.
Claim 3
Dependent Claim
71 words
The apparatus as claimed in claim 1, said detection unit further comprising a first inteRmediate frequency generator receiving said sum signal and a reference signal and generating a first intermediate frequency output on basis of which said first signal is produced, and a second intermediate frequency generator receiving said difference signal and said reference signal and generating a second intermediate frequency output on basis of which said second signal is produced.
Claim 4
Dependent Claim
43 words
The apparatus as claimed in claim 2, comprising a phase-shifter for shifting said second intermediate frequency out-put in phase angle by 90* to compensate a 90* phase difference between said sum and difference signals, said shifted output being utilized as said second signal.
Claim 5
Dependent Claim
58 words
The apparatus as claimed in claim 2, comprising a third phase-detecting means for detecting an added output of said first and second signals by said comparison signal, said third phase-detecting means developing such an output so as to allow a frequency of said reference signal to be regulated to lock the phases of said first and second signals.
Claim 6
Dependent Claim
50 words
The apparatus as claimed in claim 1, comprising a plurality of antenna arrays, each of which includes said paired antenna elements and associates with said separate hybrid circuit and said separate detection unit, outputs from said detection units being combined to thereby find the incident angle of the radio wave.
Claim 7
Dependent Claim
33 words
The apparatus as claimed in claim 5, said plural pairs of antenna elements disposed on a common plane spaced away from one another by different intervals in symmetric relation to a common axis.
Claim 8
Dependent Claim
34 words
The apparatus as claimed in claim 5, a predetermined number of said plurality of antenna arrays disposed on a first common plane and the remainder on a second plane different from said first plane.
Claim 9
Dependent Claim
18 words
The apparatus as claimed in claim 5, said plurality of antenna elements being disposed on a common periphery.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |