US3741625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarization-insensitive millimeter-wave directional coupler
Assignee: AT&T Inc
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Filing: 1971-06-21
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Granted: 1973-06-26
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Expires: 1991-06-21
Abstract
Abstract A polarization insensitive quasi-optical directional coupler comprising three contiguous dielectric layers. Polarization insensitivity of the coupler is realized by selecting the thicknesses and dielectric constants of the layers and the angular orientation of the coupler such that they satisfy predetermined relationships.
Inventors
- 👤 A Saleh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:46
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16; H01P5/19
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
A directional coupler disposed along an input wave path for transmitting and reflecting portions of an incident wave having a wavelength in the millimeter to submillimeter wavelength range propagating therealong comprising: first, second and third contiguous layers, each of said layers having dielectric properties and being substantially lossless over said range; said first, second and third layers having dielectric constants and thicknesses such that equal relative portions of said incident wave are transmitted through said layers for all polarizations of said incident wave and such that equaL relative portions of said incident wave are reflected by said layers for all polarizations of said incident wave.
Claim 2
Dependent Claim
105 words
A directional coupler disposed along an input wave path for transmitting and reflecting portions of an incident wave having a wavelength in the millimeter to submillimeter wavelength range propagating therealong comprising: first, second and third contiguous layers, each of said layers having dielectric properties and being substantially lossless over said range; said first, second and third layers having dielectric constants and thicknesses such that equal relative portions of said incident wave are transmitted through said layers for all polarizations of said incident wave and such that equaL relative portions of said incident wave are reflected by said layers for all polarizations of said incident wave.
Claim 3
Dependent Claim
40 words
A directional coupler in accordance with claim 1 wherein said first and third layers have equal dielectric constants epsilon 1 and equal thicknesses d1 and said second layer has a different dielectric constant epsilon 2 and a different thickness d2.
Claim 4
Dependent Claim
24 words
A directional coupler in accordance with claim 2 wherein said parameters epsilon 1, epsilon 2, d1 and d2 are defined by the following relationship:
Claim 5
Dependent Claim
14 words
Apparatus in accordance with claim 3 wherein theta 1 is substantially equal to 45*.
Claim 6
Dependent Claim
170 words
Apparatus comprising, in combination: an input path, first and second output paths, means for transmitting an electromagnetic wave having an arbitrary polarization and a wavelength in the millimeter to submillimeter wavelength range along said input path, means for dividing said transmitted wave into a first wave which is directed along said first output path and a second wave which is directed along said second output path, said dividing means being disposed along said input path at an angle thereto and comprising: first, second and third contiguous layers, each of said layers having dielectric properties and being substantially lossless over said range, said first and third layers having equal thicknesses and dielectric constants, and said second layer having a thickness and dielectric constant that are different from the corresponding parameters of said first and third layers by functions related to said angle and said dielectric constant of said first and third layers, said functions being those for which said first and second waves have the same polarization as said transmitted wave.
Claim 7
Dependent Claim
170 words
Apparatus comprising, in combination: an input path, first and second output paths, means for transmitting an electromagnetic wave having an arbitrary polarization and a wavelength in the millimeter to submillimeter wavelength range along said input path, means for dividing said transmitted wave into a first wave which is directed along said first output path and a second wave which is directed along said second output path, said dividing means being disposed along said input path at an angle thereto and comprising: first, second and third contiguous layers, each of said layers having dielectric properties and being substantially lossless over said range, said first and third layers having equal thicknesses and dielectric constants, and said second layer having a thickness and dielectric constant that are different from the corresponding parameters of said first and third layers by functions related to said angle and said dielectric constant of said first and third layers, said functions being those for which said first and second waves have the same polarization as said transmitted wave.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |