US4538153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directivity diversity communication system with microstrip antenna
Assignee: NTT Inc
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Filing: 1982-09-03
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Granted: 1985-08-27
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Expires: 2002-09-03
Abstract
Abstract An improved diversity communication system which has a single micro-strip antenna has been found. The micro-strip antenna according to the invention comprises a thin dielectric layer sandwiched by a ground conductor plane and a radiation conductor plane, a pair of feed points on the radiation conductor plane through the holes on the ground conductor plane, and said feed points being positioned so that a line between a first feed point and a center of the radiation conductor plane is substantially perpendicular to a line between a second feed point and a center of the radiation conductor plane. Each of the feed points is coupled with each branch input of a diversity receiver, and those feed points operate like separated two antennas, which have a pair of perpendicular directivities. Preferably, a radiation conductor plane is circular with a plurality of slots along the periphery of the same. The feed points of the present micro-strip antenna have little correlation between the same. The present invention is advantageous in particular for mobile communication as the size and/or the height of the antenna is small, and the antenna may be mounted in a housing of a receiver itself.
Inventors
- 👤 Tokio Taga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:44
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/10; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q25/00; H01Q9/00; H01Q9/04; H01Q9/0407; H04B7/04; H04B7/08; H04B7/0837; H04B7/0842; H04B7/086
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
160 words
A directivity diversity communication system comprising: (a) a micro-strip antenna having a dielectric layer sandwiched by a ground conductor plane and a circular radiation conductor plane, said circular radiation conductor plane having a plurality of slots provided around the entire circumference thereof, a pair of feed points provided on said radiation conductor plane, said feed points being positioned so that a line between a first feed point and a center of the radiation conductor plane is substantially perpendicular to a line between a second feed point and a center of the radiation conductor plane, so that a radiation pattern by a first feed point is perpendicular to a radiation pattern by a second feed point, (b) a diversity receiver for receiving signals on a pair of input terminals, each of which is coupled with one of said feed points and each of the signals on an input terminal being combined with another on another input terminal through a diversity technique.
Claim 2
Dependent Claim
160 words
A directivity diversity communication system comprising: (a) a micro-strip antenna having a dielectric layer sandwiched by a ground conductor plane and a circular radiation conductor plane, said circular radiation conductor plane having a plurality of slots provided around the entire circumference thereof, a pair of feed points provided on said radiation conductor plane, said feed points being positioned so that a line between a first feed point and a center of the radiation conductor plane is substantially perpendicular to a line between a second feed point and a center of the radiation conductor plane, so that a radiation pattern by a first feed point is perpendicular to a radiation pattern by a second feed point, (b) a diversity receiver for receiving signals on a pair of input terminals, each of which is coupled with one of said feed points and each of the signals on an input terminal being combined with another on another input terminal through a diversity technique.
Claim 3
Dependent Claim
135 words
A micro-strip antenna for a directivity diversity communication system with a pair of feed points comprising: (a) a dielectric layer which is thinner than the length of the wavelength, (b) a ground conductor plane and a circular radiation conductor plane sandwiching said dielectric layer, (c) said radiation conductor plane having a more than four slots along a periphery of the same with an equal interval, (d) a pair of feed points provided on said radiation conductor plane through a pair of through-holes on said ground conductor plane and, (e) said feed points being positioned on said radiation conductor plane so that a line between a first feed point and a center of the radiation conductor plane is substantially perpendicular to a line between a second feed point and a center of the radiation conductor plane.
Claim 4
Dependent Claim
135 words
A micro-strip antenna for a directivity diversity communication system with a pair of feed points comprising: (a) a dielectric layer which is thinner than the length of the wavelength, (b) a ground conductor plane and a circular radiation conductor plane sandwiching said dielectric layer, (c) said radiation conductor plane having a more than four slots along a periphery of the same with an equal interval, (d) a pair of feed points provided on said radiation conductor plane through a pair of through-holes on said ground conductor plane and, (e) said feed points being positioned on said radiation conductor plane so that a line between a first feed point and a center of the radiation conductor plane is substantially perpendicular to a line between a second feed point and a center of the radiation conductor plane.
Claim 5
Dependent Claim
73 words
A micro-strip attenna for a directivity diversity communication system according to claim 2, wherein the ratio (a 2 /a 1 ) of an inner radius between a center of a radiation conductor plane and an inner edge of the slots, to an outer radius (a 1 ) between a center of a radiation conductor plane and an outer edge of the slots, is greater than or equal to 0.2 and less than 1.0.
Claim 6
Dependent Claim
32 words
A micro-strip antenna for a directivity diversity communication system according to claim 2, wherein said ratio (a 2 /a 1 ) is 0.9, and the number (N) of the slots is 18.
Claim 7
Dependent Claim
42 words
A micro-strip antenna for a directivity diversity communication system according to claim 2, wherein the center angle of each slot is 360°/(2N), and the center angle of each duration between two slots is also 360°/(2N), where N is the number of slots.
References Cited (Backward Citations)
US3478362A
Cited
US4125839A
Cited
US4125838A
Cited
GB2005922A
Cited
US4318107A
Cited
JPS5763904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |