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EP0215240A2
Expired / Lapsed
EP
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Planar-array antenna for circularly polarized microwaves
Assignee: Sony Corp
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Filing: 1986-07-23
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Granted: —
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Expires: 2006-07-23
Abstract
Abstract A planar antenna for circular polarized microwaves incorporates a substrate (3) sandwiched between conductive layers (1, 2) having a plurality of openings (4, 5) arranged in a rectangular array, with a pair of perpendicular excitation probes (8, 9) supported on the substrate (3) in alignment with each opening (4, 5) and a feed circuit for interconnecting the excitation probes (8, 9) in a predetermined phase relationship. Two additional conductive elements (20, 21) may be supported on the substrate (3) in alignment with the excitation probes (8, 9) to provide improved impedance matching. The feed circuit may incorporate a pair of quarter wavelength feed lines (40, 41) connected to the excitation probes (8, 9), with a resistance element (42) interconnected between the feed lines (40, 41). The feed point (12) of the antenna may be located near the center of the array, occupying a position normally occupied by one of the pairs of excitation probes (8, 9).
Inventors
- 👤 Keiji C/O Sony Corporation Fukuzawa
- 👤 Fumihiro C/O Sony Corporation Ito
- 👤 Shinobu C/O Sony Corporation Tsurumaru
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 20:40
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/08; H01Q21/00; H01Q21/0006; H01Q21/0075; H01Q21/0081; H01Q13/10; H01Q13/18; H01Q21/06; H01Q21/061; H01Q21/064; H01Q21/24
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
95 words
A suspended line feed type planar antenna, characterized in a substrate (3) sandwiched between a pair of conductive surfaces (1, 2), each of said surfaces (1, 2) having a plurality of spaced openings (4, 5) defining radiation elements, a plurality of said openings (4, 5) having a pair of excitation probes (8, 9) formed perpendicularly to each other in a common plane on said substrate (3) in alignment with said openings, and means (7, 10, 11) for connecting signals received at said pair of excitation probes to a suspended line in phase with each other.
Claim 2
Dependent Claim
95 words
A suspended line feed type planar antenna, characterized in a substrate (3) sandwiched between a pair of conductive surfaces (1, 2), each of said surfaces (1, 2) having a plurality of spaced openings (4, 5) defining radiation elements, a plurality of said openings (4, 5) having a pair of excitation probes (8, 9) formed perpendicularly to each other in a common plane on said substrate (3) in alignment with said openings, and means (7, 10, 11) for connecting signals received at said pair of excitation probes to a suspended line in phase with each other.
Claim 3
Dependent Claim
23 words
Apparatus according to claim 1, characterized in that said excitation probes (8, 9) are formed as printed circuit elements on said substrate (3).
Claim 4
Dependent Claim
43 words
Apparatus according to claim 1 or 2, characterized in suspended line (7) interconnecting all of said excitation probes (8, 9), said suspended line (7) being formed as a printed circuit on said substrate (3) and spaced between said two conductive surfaces (1, 2).
Claim 5
Dependent Claim
53 words
Apparatus according to any one of claims 1 to 3, characterized in that said means for connecting comprises first and second suspended line segments (10) connected to said excitation probes (8, 9) and being perpendicular to each other, and means (11) for interconnecting said first and second segments to said suspended line (7).
Claim 6
Dependent Claim
45 words
Apparatus according to claim 4, characterized in that said means for interconnecting comprises a common suspended line segment (7) interconnecting said first and second suspended line segments, and a T (11; 40, 41, 42) connecting said common suspended line segment to said suspended line (7).
Claim 7
Dependent Claim
25 words
Apparatus according to claim 5, characterized in that said T (11) is offset relative to the center of said common suspended line segment (7, 10).
Claim 8
Dependent Claim
43 words
Apparatus according to any one of claims 1 to 6, characterized in that said suspended line comprises a coaxial line having an inner conductor (7) supported on said substrate (3) and an outer conductor formed by said pair of conductive surfaces (1, 2).
Claim 9
Dependent Claim
35 words
Apparatus according to any one of claims 1 to 7, characterized in a plurality of conductive segments (20, 21) aligned and spaced from said excitations probes (8, 9) in alignment with said openings (4, 5).
Claim 10
Dependent Claim
25 words
Apparatus according to claim 8, characterized in that said conductive segments (20, 21) are elongate, and are electrically connected to said conductive surfaces (1, 2).
Claim 11
Dependent Claim
26 words
Apparatus according to claim 8 or 9, characterized in that said conductive segments (20, 21) are spaced end to end from said excitation probes (8, 9).
Claim 12
Dependent Claim
27 words
Apparatus according to any one of claims 8 to 10, characterized in that said conductive segments (20, 21) are formed as printed circuits on said substrate (3).
Claim 13
Dependent Claim
66 words
Apparatus according to any one of claims 1 to 11, characterized in that said means for connecting comprises a pair of 1/4 wavelength lines (40, 41), each having one end connected to one of said excitation probes (8, 9) and the other end connected in common to a suspended line (7), and a resistor (42) interconnecting said one ends of said 1/4 wavelength lines (40, 41).
Claim 14
Dependent Claim
21 words
Apparatus according to claim 12, characterized in that said resistor (42) is formed as a printed circuit on said substrate (3).
Claim 15
Dependent Claim
26 words
Apparatus according to claim 12 or 13, characterized in that said resistor (42) has a resistance of twice the characteristic impedance of said suspended line (7).
Claim 16
Dependent Claim
46 words
Apparatus according to any one of claims 1 to 14, characterized in a rectangular array of said radiation elements (13i), and said means for connecting comprises suspended line connecting means for connecting a plurality of said excitation probes to a centrally located feed point (12, 14).
Claim 17
Dependent Claim
42 words
Apparatus according to claim 15, characterized in that said feed point (12, 14) is located at a position offset from the center of said array and occupies the position of one of said radiation elements closest to the center of said array.
Claim 18
Dependent Claim
43 words
Apparatus according to claim 15 or 16, characterized in a resistor (31) terminating a suspended line with the characteristic impedance of said line, said resistor (31) being formed on said substrate (3) as a printed circuit and located adjacent said feed point (12).
Claim 19
Dependent Claim
28 words
Apparatus according to any one of claims 15 to 17, characterized in a rectangular waveguide (30, 32) connected to said suspended line (7) at said feed point (12).
Claim 20
Dependent Claim
22 words
Apparatus according to claim 18, characterized in that said rectangular waveguide (32) has a width (a) to height (b) ratio of 2:1.
References Cited (Backward Citations)
No citation records indexed.
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