US4963891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planar antenna
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-09-29
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Granted: 1990-10-16
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Expires: 2007-09-29
Abstract
Abstract A planar antenna comprising a dielectric layer containing a homopolymer of 3-methylbutene-1 or a copolymer of 3-methylbutene-1 and an alpha-olefin of from 2 to 12 carbon atoms, a polyene or a mixture thereof, a conductor laminated on the whole back surface of said dielectric layer and a circularly polarized radiation microstrip element formed from a metal foil and provided on the other surface of said dielectric layer.
Inventors
- 👤 Yoshiki Aoyagi
- 👤 Atsushi Murakami
- 👤 Mamoru Nakada
- 👤 Mitsunori Ajiki
- 👤 Shigeru Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:13
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/0087; H01Q1/00; H01Q1/36; H01Q1/38; Y; Y10; Y10S; Y10S428/00; Y10S428/901
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
193 words
A planar antenna comprising a porous dielectric layer comprising at least one polymer selected from the group consisting of a 3-methylbutene-1homopolymer, a copolymer of 3-methylbutene-1 and an α-olefin having from 2 to 12 carbon atoms, a copolymer of 3-methylbutene-1and a polyene, a copolymer of 3-methylbutene-1, said α-olefin and said polyene, and a modified polymer obtained by graft-polymerizing a radically polymerizable monomer to each of said homopolymer and said copolymers; a conductor on one of the surfaces of said dielectric layer; and a circularly polarized radiation microstrip element on the other surface of said dielectric layer which is formed from a metal foil; said porous dielectric layer being produced by molding a mixture comprising 20 to 70% by weight of at least one polymer selected from the group consisting of said homopolymer, said copolymers and said modified polymer and 30 to 80% by weight of at least one plasticizer selected from the group consisting of an aliphatic compound, an aromatic compound, an aliphatic mineral oil and an aromatic mineral oil at a temperature of from 260° to 320° C. into a sheet form, and then subjecting the sheet to extraction with a low-boiling solvent.
Claim 2
Dependent Claim
193 words
A planar antenna comprising a porous dielectric layer comprising at least one polymer selected from the group consisting of a 3-methylbutene-1homopolymer, a copolymer of 3-methylbutene-1 and an α-olefin having from 2 to 12 carbon atoms, a copolymer of 3-methylbutene-1and a polyene, a copolymer of 3-methylbutene-1, said α-olefin and said polyene, and a modified polymer obtained by graft-polymerizing a radically polymerizable monomer to each of said homopolymer and said copolymers; a conductor on one of the surfaces of said dielectric layer; and a circularly polarized radiation microstrip element on the other surface of said dielectric layer which is formed from a metal foil; said porous dielectric layer being produced by molding a mixture comprising 20 to 70% by weight of at least one polymer selected from the group consisting of said homopolymer, said copolymers and said modified polymer and 30 to 80% by weight of at least one plasticizer selected from the group consisting of an aliphatic compound, an aromatic compound, an aliphatic mineral oil and an aromatic mineral oil at a temperature of from 260° to 320° C. into a sheet form, and then subjecting the sheet to extraction with a low-boiling solvent.
Claim 3
Dependent Claim
52 words
A planar antenna according to claim 1, wherein the thickness of said dielectric layer is from 500 to 1000 μm, the thickness of said conductor is from 0.5 to 3.0 mm and the thickness of said metal foil which forms said circularly polarized radiation microstrip element is from 10 to 40 μm.
Claim 4
Dependent Claim
36 words
A planar antenna according to claim 1, which has dielectric constant (ε) of not higher than 2.2, dielectric loss tangent (tan δ) of not higher than 15×10 -4 and gain of not less than 30 dB.
Claim 5
Dependent Claim
18 words
A planar antenna according to claim 1, wherein a glass cloth has been laminated on said dielectric layer.
Claim 6
Dependent Claim
25 words
A planar antenna according to claim 1, wherein the porosity of said dielectric layer is not less than 1.2 times as calculated by expansion ratio.
Claim 7
Dependent Claim
49 words
A planar antenna according to claim 1, wherein said aliphatic compound is cetyl alcohol, heptadecyl alcohol, stearyl alcohol, ceryl alcohol, behenyl alcohol, dioctyl ether, didecyl ether, didodecyl ether, diotadecyl ether, methyl tetradecyul ketone, n-propyl hexadecyl ketone, didodecyl ketone, dioctadecyl ketone, octyl laurate, ethyl palmitate, butyl stearate or octyl stearate.
Claim 8
Dependent Claim
17 words
A planar antenna according to claim 1, wherein said aromatic compound is dibutyl phthalate or dioctyl phthalate.
Claim 9
Dependent Claim
18 words
A planar antenna according to claim 1, wherein said aliphatic mineral oil is a process oil of paraffins.
Claim 10
Dependent Claim
18 words
A planar antenna according to claim 1, wherein said aromatic mineral oil is a process oil of naphthenes.
Claim 11
Dependent Claim
25 words
A planar antenna according to claim 1, wherein said low-boiling solvent is a lower alcohol, a ketone, a saturated aliphatic hydrocarbon or a mixture thereof.
Claim 12
Dependent Claim
16 words
A planar antenna according to claim 10, wherein said lower alcohol is methanol, ethanol or propanol.
Claim 13
Dependent Claim
16 words
A planar antenna according to claim 10, wherein said ketone is acetone or methyl ethyl ketone.
Claim 14
Dependent Claim
16 words
A planar antenna according to claim 10, wherein said saturated aliphatic hydrocarbon is hexane or heptane.
Claim 15
Dependent Claim
47 words
A planar antenna according to claim 1, wherein said radically polymerizable monomer is an unsaturated monocarboxylic acid, an ester thereof, an unsaturated dicarboxylic acid, an anhydride thereof, an amide thereof, a cycloaliphatic polybase carboxylic acid having an unsaturated bond, an aromatic vinyl compound or a vinyl ester.
Claim 16
Dependent Claim
35 words
A planar antenna according to claim 14, wherein said radically polymerizable monomer is a member selected from the group consisting of acrylic acid, glycidyl acrylate, maleic acid, maleic anhydride, maleamide, styrene, α-methylstyrene and vinyl acetate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |