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US3768007A Expired / Lapsed US ⏱️ 0.0 years remaining

Tapped delay line phase discriminator

Assignee: US Philips Corp
•
Filing: 1972-07-19
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Granted: 1973-10-23
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Expires: 1992-07-19
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Abstract

Abstract A phase discriminator comprises a transmission line which is tapped by four detectors connected respectively to four points spaced along the line at regular intervals of lambda /8. The line is tapped by a fifth detector connected to a point on the line separated from one of those four points by lambda /16, lambda being the wavelength of two signals fed to respective ends of the line. This arrangement enables the phase difference to be located within intervals of pi /8 radians. The fifth detector may suitably be situated symmetrically with respect to the first four two further detectors may tap the line at two additional tapping points, one being located lambda /32 from an end tapping-point and the other additional point being 3 lambda /32 from a penultimate tapping-point: this enables the phase difference to be located within intervals of pi /16 radians.

Inventors

  • 👤 T Tozer

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 11:43
CPC Classifications
G; G01; G01R; G01R25/00; G01R25/02

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 116 words
A phase discriminator, for comparing the phases of two signals having a wavelength lambda , comprising, in combination, a transmission line having spaced porTions adapted for receiving said signals, respectively, first four tapping points spaced along the line at regular intervals of lambda /8 and arranged between said spaced portions, a fifth tapping point spaced from at least one of said first four tapping points by an interval of lambda /16, detecting means connected to each tapping point, and means for providing phase-dependent difference signals forming together a code representative of the measured phase comprising a logic circuitry including subtraction circuits connected between the outputs of at least eight different pair arrangements of said detecting means.
Claim 2
Dependent Claim 116 words
A phase discriminator, for comparing the phases of two signals having a wavelength lambda , comprising, in combination, a transmission line having spaced porTions adapted for receiving said signals, respectively, first four tapping points spaced along the line at regular intervals of lambda /8 and arranged between said spaced portions, a fifth tapping point spaced from at least one of said first four tapping points by an interval of lambda /16, detecting means connected to each tapping point, and means for providing phase-dependent difference signals forming together a code representative of the measured phase comprising a logic circuitry including subtraction circuits connected between the outputs of at least eight different pair arrangements of said detecting means.
Claim 3
Dependent Claim 38 words
A phase discriminator as claimed in claim 1 wherein said logic circuitry further comprises binary circuits connected to the outputs of said subtraction circuits to display at least an eight-bit binary code representative of a measured phase interval.
Claim 4
Dependent Claim 21 words
A phase discriminator according to claim 1 wherein the fifth tapping-point is situated symmetrically with respect to the first four tapping-points.
Claim 5
Dependent Claim 34 words
A phase discriminator according to claim 3 and tapped by two further detectors connected one to each point which is lambda /32 from an end tapping-point and 3 lambda /32 from a penultimate tapping-point.
Claim 6
Dependent Claim 16 words
A phase discriminator according to claim 1 wherein the transmission line is 3 lambda /8 long.

References Cited (Backward Citations)

US3113315A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-10-22 1977-04-23 1977-10-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-10-22 1981-04-23 1981-10-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-10-22 1985-04-23 1985-10-23 $7700.00 Window Closed / Lapsed

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