US3720953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual polarized slot elements in septated waveguide cavity
Assignee: Raytheon Co
•
Filing: 1972-02-02
•
Granted: 1973-03-13
•
Expires: 1992-02-02
Abstract
Abstract A slot radiating element for use in a two-dimensional phased array is in the ''''end'''' wall of a septated waveguide which is stepped-down in back of the radiating element to allow for excitation by means of reduced-height waveguide, stripline, coaxial line or other feeding networks without requiring additional vertical or horizontal spacing between the radiating elements. The radiating element constitutes a crossed or vertical slot or circular hole in the end wall centered over the septum with an additional slot in the septum extending into the cavity from the radiating element to excite the horizontal component (component in the plane of the septum) of polarization. Opposite sides of the septum are excited in antiphase (odd mode) to cause excitation of an electric field parallel to the septum in the radiating slot or hole and are fed in-phase (even mode) to cause excitation of an electric field perpendicular to the plane of the septum in the radiating element. Thus, polarization of the radiating slots or hole and, hence, the antenna is controlled by controlling the phase and/or amplitude relationship between the two excitations. In view of the arbitrary height of the slotted end wall, arrays can be stacked close enough to allow the capability of being scanned by phase shift in that plane, without formation of grating lobes.
Inventors
- 👤 J Ajioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:33
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/24; H01Q13/00; H01Q13/10; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/13; H01Q19/138; H01Q21/0006; H01Q21/0031; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/34
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
204 words
A two-dimensional phased array comprising a plurality of rows of contiguous slot radiating elements in a common plane, each of said radiating elements including: a. uniformly oriented sections of waveguide disposed normal to and commencing from said common plane in a common direction; b. a stepped-down extension in the narrow dimension attached to each of said uniformly oriented sections of waveguide and extending away from said common plane; c. a conductive end wall disposed across each of said uniformly oriented sections of waveguide in said common plane; d. a center conductive septum disposed across the broad dimension of each of said uniformly oriented sections of waveguide and said stepped-down extension thereto, thereby to form first and second cavities in each of said sections of waveguide; e. a radiating aperture disposed across said center septum in each of said end walls in said common plane; f. a slot in each of said center septums commencing from each of said radiating apertures in said common plane, and g. means for exciting said first and second cavities with energy of the type included in the group wherein said first and second cavities are energized in phase and wherein said first and second cavities are energized in anti-phase.
Claim 2
Dependent Claim
204 words
A two-dimensional phased array comprising a plurality of rows of contiguous slot radiating elements in a common plane, each of said radiating elements including: a. uniformly oriented sections of waveguide disposed normal to and commencing from said common plane in a common direction; b. a stepped-down extension in the narrow dimension attached to each of said uniformly oriented sections of waveguide and extending away from said common plane; c. a conductive end wall disposed across each of said uniformly oriented sections of waveguide in said common plane; d. a center conductive septum disposed across the broad dimension of each of said uniformly oriented sections of waveguide and said stepped-down extension thereto, thereby to form first and second cavities in each of said sections of waveguide; e. a radiating aperture disposed across said center septum in each of said end walls in said common plane; f. a slot in each of said center septums commencing from each of said radiating apertures in said common plane, and g. means for exciting said first and second cavities with energy of the type included in the group wherein said first and second cavities are energized in phase and wherein said first and second cavities are energized in anti-phase.
Claim 3
Dependent Claim
204 words
A two-dimensional phased array comprising a plurality of rows of contiguous slot radiating elements in a common plane, each of said radiating elements including: a. uniformly oriented sections of waveguide disposed normal to and commencing from said common plane in a common direction; b. a stepped-down extension in the narrow dimension attached to each of said uniformly oriented sections of waveguide and extending away from said common plane; c. a conductive end wall disposed across each of said uniformly oriented sections of waveguide in said common plane; d. a center conductive septum disposed across the broad dimension of each of said uniformly oriented sections of waveguide and said stepped-down extension thereto, thereby to form first and second cavities in each of said sections of waveguide; e. a radiating aperture disposed across said center septum in each of said end walls in said common plane; f. a slot in each of said center septums commencing from each of said radiating apertures in said common plane, and g. means for exciting said first and second cavities with energy of the type included in the group wherein said first and second cavities are energized in phase and wherein said first and second cavities are energized in anti-phase.
Claim 4
Dependent Claim
204 words
A two-dimensional phased array comprising a plurality of rows of contiguous slot radiating elements in a common plane, each of said radiating elements including: a. uniformly oriented sections of waveguide disposed normal to and commencing from said common plane in a common direction; b. a stepped-down extension in the narrow dimension attached to each of said uniformly oriented sections of waveguide and extending away from said common plane; c. a conductive end wall disposed across each of said uniformly oriented sections of waveguide in said common plane; d. a center conductive septum disposed across the broad dimension of each of said uniformly oriented sections of waveguide and said stepped-down extension thereto, thereby to form first and second cavities in each of said sections of waveguide; e. a radiating aperture disposed across said center septum in each of said end walls in said common plane; f. a slot in each of said center septums commencing from each of said radiating apertures in said common plane, and g. means for exciting said first and second cavities with energy of the type included in the group wherein said first and second cavities are energized in phase and wherein said first and second cavities are energized in anti-phase.
Claim 5
Dependent Claim
38 words
The two-dimensional phased array as defined in claim 1 wherein said radiating aperture disposed across said center septum in each of said end walls in said common plane is a longitudinal slot oriented normal to said center septum.
Claim 6
Dependent Claim
34 words
The two-dimensional phased array as defined in claim 2 including an additional longitudinal slot in each of said end walls disposed normal to and across said longitudinal slot oriented normal to said center septum.
Claim 7
Dependent Claim
32 words
The two-dimensional phased array as defined in claim 1 wherein said radiating aperture disposed across said center septum in each of said end walls in said common plane has a circular configuration.
Claim 8
Dependent Claim
57 words
The two-dimensional phased array as defined in claim 1 wherein said radiating aperture disposed across said center septum in each of said end walls in said common plane constitutes first and second crossed longitudinal slots disposed in said end wall with said center septum bisecting the angle therebetween, said crossed longitudinal slots being substantially the same length.
Claim 9
Dependent Claim
44 words
The two-dimensional phased array as defined in claim 1 wherein said slot in each of said center septums is at an angle with said end wall, thereby to control the phase of the horizontal polarization component of energy radiated from the concomitant radiating aperture.
Claim 10
Dependent Claim
60 words
The two-dimensional phased array as defined in claim 1 wherein said slot in each of said center septums is normal to said end wall and on one side of the centerline of said center septum along said uniformly oriented sections of waveguide, thereby to control the phase of the horizontal polarization component of energy radiated from the concomitant radiating aperture.
Claim 11
Dependent Claim
47 words
The two-dimensional phased array as defined in claim 1 wherein said slot in each of said center septums has segments that are normal and parallel to said end wall, thereby to control the phase of the horizontal polarization component of energy radiated from the concomitant radiating aperture.
Claim 12
Dependent Claim
31 words
The two-dimensional phased array as defined in claim 8 wherein said slot in each of said center septums has a plurality of spaced segments that are parallel to said end wall.
Claim 13
Dependent Claim
47 words
The two-dimensional phased array as defined in claim 8 wherein said segment of said slot in each of said center septums that is normal to said end wall is disposed to one side of the centerline of said center septum along said uniformly oriented sections of waveguide.
Claim 14
Dependent Claim
217 words
A two-dimensional phased array comprising a plurality of rows of contiguous slot radiating elements in a common plaNe, each of said radiating elements including: a. uniformly oriented sections of waveguide disposed normal to and commencing from said common plane in a common direction; b. a stepped-down extension in the narrow dimension attached to each of said uniformly oriented sections of waveguide and extending away from said common plane; c. conductive end walls disposed across opposite extremities of each of said uniformly oriented sections of waveguide and said stepped-down extensions thereto, thereby to enclose each of said sections of waveguide; d. a center conductive septum disposed across the broad dimension of each of said uniformly oriented sections of waveguide and said stepped-down extensions thereto thereby to form first and second cavities in each of said enclosed sections of waveguide; e. a radiating aperture disposed across said center septum in each of said end walls in said common plane; f. a slot in each of said center septums commencing from each of said radiating apertures in said common plane; and g. means for exciting said first and second cavities with energy of the type included in the group wherein said first and second cavities are energized in phase and wherein said first and second cavities are energized in anti-phase.
Claim 15
Dependent Claim
217 words
A two-dimensional phased array comprising a plurality of rows of contiguous slot radiating elements in a common plaNe, each of said radiating elements including: a. uniformly oriented sections of waveguide disposed normal to and commencing from said common plane in a common direction; b. a stepped-down extension in the narrow dimension attached to each of said uniformly oriented sections of waveguide and extending away from said common plane; c. conductive end walls disposed across opposite extremities of each of said uniformly oriented sections of waveguide and said stepped-down extensions thereto, thereby to enclose each of said sections of waveguide; d. a center conductive septum disposed across the broad dimension of each of said uniformly oriented sections of waveguide and said stepped-down extensions thereto thereby to form first and second cavities in each of said enclosed sections of waveguide; e. a radiating aperture disposed across said center septum in each of said end walls in said common plane; f. a slot in each of said center septums commencing from each of said radiating apertures in said common plane; and g. means for exciting said first and second cavities with energy of the type included in the group wherein said first and second cavities are energized in phase and wherein said first and second cavities are energized in anti-phase.
Claim 16
Dependent Claim
37 words
The two-dimensional phased array as defined in claim 11 wherein said last-named means includes first and second strip line corporate feeds coupled to said first and second cavities, respectively, of said radiating elements along a common row.
Claim 17
Dependent Claim
50 words
The two-dimensional phased array as defined in claim 11 wherein said last-named means includes first and second lengths of reduced-height waveguide disposed normal to and on opposite sides of said stepped-down extensions of said radiating elements along a common row and coupled to said first and second cavities thereof, respectively.
Claim 18
Dependent Claim
202 words
A two-dimensional phased array comprising a plurality of rows of contiguous slot radiating elements in a common plane, each of said radiating elements including: a. uniformly oriented sections of waveguide disposed normal to and commencing from said common plane in a common direction; b. a stepped-down extension in the narrow dimension attached to each of said uniformly oriented sections of waveguide and extending away from said common plane; c. a conductive end wall disposed across each of said uniformly oriented sections of waveguide in said common plane, d. a center conductive septum disposed across the broad dimension of each of said uniformly oriented sections of waveguide and said stepped-down extension thereto, thereby to form first and second cavities in each of said sections of waveguide; e. a radiating aperture disposed across said center septum in each of said end walls in said common plane; f. a slot in each of said center septums commencing from each of said radiating apertures in said common plane, and g. means including a parallel plate antenna feed for exciting said first and second cavities of a number of adjacent uniformly oriented sections of waveguide along a row with microwave energy through said respective stepped-down extensions thereto.
Claim 19
Dependent Claim
202 words
A two-dimensional phased array comprising a plurality of rows of contiguous slot radiating elements in a common plane, each of said radiating elements including: a. uniformly oriented sections of waveguide disposed normal to and commencing from said common plane in a common direction; b. a stepped-down extension in the narrow dimension attached to each of said uniformly oriented sections of waveguide and extending away from said common plane; c. a conductive end wall disposed across each of said uniformly oriented sections of waveguide in said common plane, d. a center conductive septum disposed across the broad dimension of each of said uniformly oriented sections of waveguide and said stepped-down extension thereto, thereby to form first and second cavities in each of said sections of waveguide; e. a radiating aperture disposed across said center septum in each of said end walls in said common plane; f. a slot in each of said center septums commencing from each of said radiating apertures in said common plane, and g. means including a parallel plate antenna feed for exciting said first and second cavities of a number of adjacent uniformly oriented sections of waveguide along a row with microwave energy through said respective stepped-down extensions thereto.
References Cited (Backward Citations)
US3599216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |