US4935747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial mode helical antenna
Assignee: Aisin Corp
•
Filing: 1987-09-10
•
Granted: 1990-06-19
•
Expires: 2007-09-10
Abstract
Abstract An axial mode helical antenna includes a metal belt member disposed around the reflector of the antenna in order to permit use of reduced diameter reflectors and, therefore, to produce a small helical antenna having increased directivity.
Inventors
- 👤 Murakami Yuichi
- 👤 Ieda Kiyokazu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:36
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/42; H01Q11/00; H01Q11/02; H01Q11/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
In an axial mode helical antenna having a holder member, a conductor wound around said holder member so as to form a helical antenna element, and a reflector connected to one end of said holder member, an improvement comprising: a metal belt having first and second ends which is electrically insulated from and disposed substantially around the perimeter of said reflector to permit the use of a small diameter reflector.
Claim 2
Dependent Claim
70 words
In an axial mode helical antenna having a holder member, a conductor wound around said holder member so as to form a helical antenna element, and a reflector connected to one end of said holder member, an improvement comprising: a metal belt having first and second ends which is electrically insulated from and disposed substantially around the perimeter of said reflector to permit the use of a small diameter reflector.
Claim 3
Dependent Claim
30 words
The improved axial mode helical antenna according to claim 1 wherein the reflector is circular and the center of said metal belt is aligned with the circumference of said reflector.
Claim 4
Dependent Claim
30 words
The improved axial mode helical antenna according to claim 1 wherein the reflector is circular and has a diameter of 0.485λ, λ being the free space wavelength of the antenna.
Claim 5
Dependent Claim
82 words
An axial mode helical antenna comprising: a holder member; a conductor wound around said holder member so as to form a helical antenna element; a reflector connected to one end of said holder member; and a metal belt having first and second ends which is electrically insulated from and disposed substantially around the perimeter of said reflector to permit the use of a small diameter reflector, the center of said non-looped metal belt being substantially aligned with the perimeter of said reflector.
Claim 6
Dependent Claim
82 words
An axial mode helical antenna comprising: a holder member; a conductor wound around said holder member so as to form a helical antenna element; a reflector connected to one end of said holder member; and a metal belt having first and second ends which is electrically insulated from and disposed substantially around the perimeter of said reflector to permit the use of a small diameter reflector, the center of said non-looped metal belt being substantially aligned with the perimeter of said reflector.
References Cited (Backward Citations)
US3573840A
Cited
US4012744A
Cited
US4427984A
Cited
US4516133A
Cited
JPS5977705A
Cited
JPS61208904A
Cited
US4742359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |