US5594455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bidirectional printed antenna
Assignee: NTT Inc
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Filing: 1995-06-07
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Granted: 1997-01-14
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Expires: 2015-06-07
Abstract
Abstract A bidirectional printed antenna includes a dielectric substrate (33) having first and second surfaces which are substantially in parallel, at least one pair of radiation element conductors (31, 32) having the same shape and the same size, each pair of which is arranged on the first and second surfaces at positions opposing with each other, respectively, a feeding circuit (34, 35, 36, 37) coupled to at least one edge of each of the radiation element conductors, and a ground conductor (37) arranged on the second surface. The ground conductor (37) covers at least an area outside of the edge of the radiation element conductor, which edge is coupled to the feeding circuit, and an area outside of the opposite edge with respect to the radiation element conductor by leaving a gap of a predetermined width between the radiation element conductor and this ground conductor. The antenna further includes a first strip conductor (34, 35) arranged on the first surface and connected to the radiation element conductor (31) on the first surface, and a second strip conductor (36) arranged on the second surface, for connecting the radiation element conductor (32) on the second surface with the ground conductor. The above-mentioned feeding circuit includes an unbalanced feed line which consists of the ground conductor (37) and the first strip conductor (35), and a balanced feed line which consists of the first and second strip conductors (34, 36).
Inventors
- 👤 Toshikazu Hori
- 👤 Keizo Cho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:39
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/08; H01Q25/00; H01Q25/005; H01Q5/00; H01Q5/30; H01Q5/378; H01Q5/385; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/0414
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
227 words
A bidirectional printed antenna comprising: a dielectric substrate having first and second surfaces which are substantially in parallel; at least one pair of radiation element conductors having the same shape and the same size, each pair of said radiation element conductors being arranged on said first and second surfaces at positions opposing with each other, respectively; a feeding circuit coupled to at least one edge of each of said radiation element conductors; a ground conductor arranged on said second surface, said ground conductor covering at least an area outside of said at least one edge of said radiation element conductor on said second surface, coupled to said feeding circuit, and an area outside of an opposite edge with respect to said radiation element conductor on said second surface by leaving a gap of a predetermined width between the radiation element conductor on said second surface and the ground conductor; a first strip conductor arranged on said first surface and connected to said radiation element conductor on the first surface; and a second strip conductor arranged on said second surface, for connecting said radiation element conductor on the second surface with said ground conductor, said feeding circuit including a first unbalanced feed line which consists of said ground conductor and said first strip conductor, and a balanced feed line which consists of said first and second strip conductors.
Claim 2
Dependent Claim
227 words
A bidirectional printed antenna comprising: a dielectric substrate having first and second surfaces which are substantially in parallel; at least one pair of radiation element conductors having the same shape and the same size, each pair of said radiation element conductors being arranged on said first and second surfaces at positions opposing with each other, respectively; a feeding circuit coupled to at least one edge of each of said radiation element conductors; a ground conductor arranged on said second surface, said ground conductor covering at least an area outside of said at least one edge of said radiation element conductor on said second surface, coupled to said feeding circuit, and an area outside of an opposite edge with respect to said radiation element conductor on said second surface by leaving a gap of a predetermined width between the radiation element conductor on said second surface and the ground conductor; a first strip conductor arranged on said first surface and connected to said radiation element conductor on the first surface; and a second strip conductor arranged on said second surface, for connecting said radiation element conductor on the second surface with said ground conductor, said feeding circuit including a first unbalanced feed line which consists of said ground conductor and said first strip conductor, and a balanced feed line which consists of said first and second strip conductors.
Claim 3
Dependent Claim
43 words
The antenna as claimed in claim 1, wherein said ground conductor is arranged around said radiation element conductor of said second surface by leaving a gap of a predetermined width between the radiation element conductor of said second surface and the ground conductor.
Claim 4
Dependent Claim
25 words
The antenna as claimed in claim 1, wherein a plurality of pairs of said radiation element conductors are arranged on the substrate in an array.
Claim 5
Dependent Claim
47 words
The antenna as claimed in claim 1, wherein each of said radiation element conductors is formed in a square shape having four sides, and wherein said balanced feed line is connected to one of said four sides of each of the radiation element conductors at its center.
Claim 6
Dependent Claim
54 words
The antenna as claimed in claim 1, wherein each of said radiation element conductors is formed in a rectangular shape having long sides and short sides which are shorter than said long sides, and wherein said balanced feed line is connected to one of said long sides of each of the radiation element conductors.
Claim 7
Dependent Claim
29 words
The antenna as claimed in claim 5, wherein said balanced feed line is connected to said long side of the each of radiation element conductors at an off-centered point.
Claim 8
Dependent Claim
65 words
The antenna as claimed in claim 1, wherein said antenna further comprises at least one pair of parasitic element conductors with no feeding, which oppose said radiation element conductors, respectively, each of said parasitic element conductors having substantially the same shape as that of the radiation element conductor and locating at a position apart from each of said radiation element conductors by a predetermined distance.
Claim 9
Dependent Claim
46 words
The antenna as claimed in claim 1, wherein said unbalanced feed line has a predetermined line length and a predetermined line width so that exciting phase and exciting amplitude of said radiation element conductors are controlled to a desired phase and to a desired amplitude, respectively.
Claim 10
Dependent Claim
53 words
The antenna as claimed in claim 2, wherein said antenna further comprises at least one slot and a third strip conductor arranged on said first surface crossed with said slot, and wherein said slot is fed by a second unbalanced feed line which consists of said third strip conductor and said ground conductor.
Claim 11
Dependent Claim
51 words
The antenna as claimed in claim 9, wherein a plurality of pairs of said radiation element conductors and a plurality of said slots are arranged on the substrate in an array, and wherein the number of said slots is the same as that of said pairs of the radiation element conductors.
Claim 12
Dependent Claim
50 words
The antenna as claimed in claim 9, wherein said radiation element conductors are formed in a rectangular shape having long sides and short sides which are shorter than said long sides, and wherein said balanced feed line is connected to one of said long sides of the radiation element conductor.
Claim 13
Dependent Claim
65 words
The antenna as claimed in claim 9, wherein said antenna further comprises at least one pair of parasitic element conductors with no feeding, which oppose said radiation element conductors, respectively, each of said parasitic element conductors having substantially the same shape as that of the radiation element conductors and locating at a position apart from each of said radiation element conductors by a predetermined distance.
Claim 14
Dependent Claim
47 words
The antenna as claimed in claim 9, wherein said second unbalanced feed line has a predetermined line length and a predetermined line width so that exciting phase and exciting amplitude of said radiation element conductors are controlled to a desired phase and to a desired amplitude, respectively.
Claim 15
Dependent Claim
40 words
The antenna as claimed in claim 9, wherein said antenna further comprises a 90° hybrid inserted between said first unbalanced feed line for feeding to said radiation element conductors and said second unbalanced feed line for feeding to said slot.
References Cited (Backward Citations)
US4899164A
Cited
JPH03254208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-01-14 | 2000-07-15 | 2001-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-14 | 2004-07-15 | 2005-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-14 | 2008-07-15 | 2009-01-14 | $7700.00 | Window Closed / Lapsed |