US4516133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna element having non-feed conductive loop surrounding radiating element
Assignee: Japan Radio Co Ltd
•
Filing: 1982-09-07
•
Granted: 1985-05-07
•
Expires: 2002-09-07
Abstract
Abstract The directivity as well as the gain of an antenna element associated with a finite length reflector, which includes a feed antenna such as a dipole antenna and a reflector having a finite length of several wavelengths or less, are improved by disposing a non-feed loop element having a peripheral length of about 2 wavelengths along a common imaginary plane with the feed antenna so as to surround the feed antenna. Preferably, the non-feed loop element is disposed in parallel to the reflector, and more preferably it is disposed nearly symmetrically with respect to the center of the feed antenna.
Inventors
- 👤 Shigeru Matsumoto
- 👤 Yoshikatsu Okabe
- 👤 Yasuhiro Kazama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:20
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q19/00; H01Q19/06; H01Q19/10; H01Q19/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
An antenna element adaptable for use as a primary antenna in a parabolic antenna system, comprising a feed dipole antenna, a reflector having a finite length and supported in spaced-apart operative relation to said feed dipole antenna, and a non-feed loop element stationarily disposed around said dipole antenna generally in parallel with said reflector and electrically insulated from both said dipole antenna and said reflector, said non-feed loop element being a closed and endless loop element of a wire-like thin conductor material in the plane of said dipole antenna, wherein said non-feed loop element is of a shape and circumferential length selected to increase the H-plane directivity of said feed dipole antenna and said reflector in the absence of said non-feed loop element, in the proximity of the directions of extension of said reflector.
Claim 2
Dependent Claim
134 words
An antenna element adaptable for use as a primary antenna in a parabolic antenna system, comprising a feed dipole antenna, a reflector having a finite length and supported in spaced-apart operative relation to said feed dipole antenna, and a non-feed loop element stationarily disposed around said dipole antenna generally in parallel with said reflector and electrically insulated from both said dipole antenna and said reflector, said non-feed loop element being a closed and endless loop element of a wire-like thin conductor material in the plane of said dipole antenna, wherein said non-feed loop element is of a shape and circumferential length selected to increase the H-plane directivity of said feed dipole antenna and said reflector in the absence of said non-feed loop element, in the proximity of the directions of extension of said reflector.
Claim 3
Dependent Claim
32 words
An antenna element as claimed in claim 1, wherein said dipole antenna has a length of 1/2 wavelengths, and the entire circumference of said non-feed loop element has a length of 1.5λ-2.5λ.
Claim 4
Dependent Claim
19 words
An antenna element as claimed in claim 1, wherein said non-feed element is formed in a circular ring shape.
Claim 5
Dependent Claim
19 words
An antenna element as claimed in claim 1, wherein said non-feed loop element is formed in a square shape.
Claim 6
Dependent Claim
26 words
An antenna element as claimed in claim 1, wherein said non-feed loop element is disposed substantially symmetrically with respect to the center of said feed antenna.
Claim 7
Dependent Claim
25 words
An antenna element as claimed in claim 2, wherein said non-feed looop element is formed in a circular ring shape of a diameter of 0.6λ-0.7λ.
Claim 8
Dependent Claim
17 words
An antenna element as claimed in claim 1, wherein said dipole antenna is a cross dipole antenna.
References Cited (Backward Citations)
US2556046A
Cited
US2657313A
Cited
US2998605A
Cited
GB959019A
Cited
US3605104A
Cited
GB1396827A
Cited
US3887926A
Cited
GB1555307A
Cited
US4240080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |