US3747112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide band dipole antenna with capacitive reactance added to arms
Assignee: Toshiba Corp
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Filing: 1971-05-24
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Granted: 1973-07-17
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Expires: 1991-05-24
Abstract
Abstract A wide-band antenna comprising a dipole antenna mainly consisting of a pair of linearly arranged antenna arms and a capacitor disposed at a prescribed one point on each of said paired arms equally spaced from the center of a feeding portion.
Inventors
- 👤 K Hidaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:32
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/28; H01Q19/30; H01Q19/02; H01Q5/00; H01Q5/10; H01Q5/15; H01Q5/30; H01Q5/307; H01Q5/314; H01Q5/321; H01Q9/00; H01Q9/04; H01Q9/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
173 words
A wide band dipole antenna comprising: a feeding portion; a pair of arms extending in line with each other in opposite directions from said feeding portion; and a pair of capacitors, one disposed in each of said arms respectively, located at points equally spaced from the center of said feeding portion, and connected electrically in series with said arms; in which C1/l2 is between 0.25 and 0.3; 2ln(2l2/ Rho 2) and 2ln(2l2/ Rho 1) are each less than 12; and, l1/l2 is between 0.4 and 0.6 where C1 is the capacitance of said capacitor in picofarads l1 is the distance between said capacitor and the center of said feeding portion l2 is the distance from the end of either arm to the center of said feeding portion Rho 1 is the radius of said arms between said feeding portion and said capacitor Rho 2 is the radius of said arms between said capacitor and the outer ends of the arms ln is the base of natural logarithms all physical measurements being in centimeters.
Claim 2
Dependent Claim
173 words
A wide band dipole antenna comprising: a feeding portion; a pair of arms extending in line with each other in opposite directions from said feeding portion; and a pair of capacitors, one disposed in each of said arms respectively, located at points equally spaced from the center of said feeding portion, and connected electrically in series with said arms; in which C1/l2 is between 0.25 and 0.3; 2ln(2l2/ Rho 2) and 2ln(2l2/ Rho 1) are each less than 12; and, l1/l2 is between 0.4 and 0.6 where C1 is the capacitance of said capacitor in picofarads l1 is the distance between said capacitor and the center of said feeding portion l2 is the distance from the end of either arm to the center of said feeding portion Rho 1 is the radius of said arms between said feeding portion and said capacitor Rho 2 is the radius of said arms between said capacitor and the outer ends of the arms ln is the base of natural logarithms all physical measurements being in centimeters.
Claim 3
Dependent Claim
122 words
A wide-band antenna according to claim 1 wherein said capacitor is formed of those end portions of pair of hollow conductors substantially constituting the antenna arm which face each other at a predetermined space; a central conductor of predetermined length coaxially disposed with the hollow conductors in the interspace between said facing end portions; an inner dielectric material filled in an area defined by the inner walls of the facing end portions of the hollow conductors with the outer walls of the central conductor as well as in an interspace between said facing end portions; and an outer insulation material mounted on the outer peripheral surface of said facing end portions, as well as of the fractional extensions of said end portions.
Claim 4
Dependent Claim
118 words
A wide-band antenna according to claim 1 where said capacitor is formed of the end portion of a first hollow conductor substantially constituting the antenna arm; that end portion of a second conductor having a smaller diameter than said first hollow conductor and inserted coaxially therewith at a space for predetermined distance which faces the end portion of said first hollow conductor; an inner dielectric material filled in said first hollow conductor so as to surround the aforesaid end of the second conductor; and an outer insulation material deposited on the outer peripheral surface of the end portion of the first hollow conductor as well as of the fractional extension of the end portion of the second conductor.
Claim 5
Dependent Claim
77 words
A wide-band antenna according to claim 1 wherein said capacitor consists of those portions of a pair of plate conductors substantially constituting the antenna arm which face each other at predetermined space; an inner dielectric material filled between said facing end portions; an outer insulation material deposited on the outer peripheral surface of those portions of the paired conductors between which there is filled said dielectric material as well as of the fractional extensions of said portions.
Claim 6
Dependent Claim
80 words
A wide-band antenna according to claim 1 wherein said capacitor is constituted by flattened end portions of a pair of hollow conductors substantially forming the antenna arms which are inclined in opposite directions with respect to the axis of said conductors so as to face each other at a predetermined space; and a dieLectric material deposited between said facing flattened end portions and on the outer peripheral surface of said end portions as well as of the fractional extensions thereof.
Claim 7
Dependent Claim
20 words
A wide band yagi antenna comprising director elements, a reflector element and a dipole element as defined by claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |