EP0126626A2
Expired / Lapsed
EP
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Resonant waveguide aperture manifold
Assignee: BAE Systems Aerospace Inc
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Filing: 1984-05-17
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Granted: —
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Expires: 2004-05-17
Abstract
Abstract A waveguide manifold (200) for monitoring the operation of an array antenna (1). The waveguide is centerfed (203) and has reflecting terminations (201, 202) at either end. The waveguide output is matched to the waveguide as if non-reflecting terminations were at either end of the waveguide. The waveguide input is a plurality of groups of slots (206-214) wherein adjacent slots in each group (A, B, C, D) have alternating polarity and adjacent groups may have alternating phase. A standing wave created in the waveguide has a plurality of cells of alternating phase. Each slot is located within one of the resonating standing wave cells. The resulting manifold beam forming characteristic will be temperature and frequency independent over a practical range.
Inventors
- 👤 Richard F. Frazita
- 👤 Alfred R. Lopez
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 11:26
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/267
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
117 words
Apparatus comprising a transmission line (200) for directing electromagnetic energy in a predetermined frequency range, said line having first and second ends; and elements (206-214) associated with said line; said apparatus characterised by: (a) a transducer (203) associated with said line for converting energy having a frequency within the predetermined frequency range into an electrical signal having a corresponding frequency and vice versa, said transducer having an impedance which is matched to said line as if said line had substantially non-reflecting terminations coupled to the first and second ends thereof; (b) a first short circuit (201) at the first end of said line; and (c) a second short circuit (202) at the second end of said line.
Claim 2
Dependent Claim
117 words
Apparatus comprising a transmission line (200) for directing electromagnetic energy in a predetermined frequency range, said line having first and second ends; and elements (206-214) associated with said line; said apparatus characterised by: (a) a transducer (203) associated with said line for converting energy having a frequency within the predetermined frequency range into an electrical signal having a corresponding frequency and vice versa, said transducer having an impedance which is matched to said line as if said line had substantially non-reflecting terminations coupled to the first and second ends thereof; (b) a first short circuit (201) at the first end of said line; and (c) a second short circuit (202) at the second end of said line.
Claim 3
Dependent Claim
13 words
Apparatus according to claim 1 wherein adjacent elements (Fig. 4A) have different phases.
Claim 4
Dependent Claim
29 words
Apparatus according to claim 1 or claim 2 wherein said transmission line (200) comprises an electrically conductive hollow member and said elements comprise openings (206-214, 506-508) in said member.
Claim 5
Dependent Claim
45 words
Apparatus according to claim 3 wherein said electrically conductive hollow member is a linear waveguide of rectangular cross-section (Figures 5 and 6) and said openings comprise a linear array of slots spaced apart by substantially one-half of the waveguide wavelength of said member (Figure 3).
Claim 6
Dependent Claim
16 words
Apparatus according to claim 4 wherein said transducer comprises a connector (203) projecting into said member.
Claim 7
Dependent Claim
21 words
Apparatus according to claim 5 further including a circuit (215) for isolating from the waveguide any load connected to the connector.
Claim 8
Dependent Claim
63 words
Apparatus acording to any one of claims 4 to 6 wherein said first short circuit (201) comprises f first electrically conductive member substantially perpendicular to the sides of said waveguide and attached to the first end, and said second short circuit comprises a second electrically conductive member substantially perpendicular to the sides of said waveguide and attached to the second end Figure 3).
Claim 9
Dependent Claim
18 words
Apparatus according to any one of claims 1 to 7 wherein adjacent elements have opposite phases (Figure 4A).
Claim 10
Dependent Claim
29 words
Apparatus according to any one of claims 1 to 8 further including apparatus (250,260) for eliminating odd mode resonance thereby reducing amplitude and phase distortions of the element excitations.
Claim 11
Dependent Claim
19 words
Apparatus according to claim 9 wherein said apparatus for eliminating comprises a ridge (250, 260) located within said member.
Claim 12
Dependent Claim
83 words
Apparatus according to any one of claims 1 to 10 comprising: groups (A,B,C, D) of elements associated with said line wherein adjacent groups have different phase (Figure 4B), each group having N elements wherein adjacent elements within each group have different phases, where N is a positive even integer greater than one; whereby supplying an electrical signal having a frequency within the predetermined frequency range to the transducer results in the elements radiating a beam which is not perpendicular to the transmission line.
Claim 13
Dependent Claim
22 words
Apparatus according to claim 11 wherein said elements are waveguide slots configured to approximate a beam pointing angle of approximately 11.25°(Figure 4B).
Claim 14
Dependent Claim
28 words
Apparatus according to claim 11 or claim 12 wherein adjacent groups (AB,BC,CD) of elements have opposite phases and adjacent elements within each group have opposite phases (Figure 4B).
References Cited (Backward Citations)
No citation records indexed.
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