US4494122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna apparatus capable of resonating at two different frequencies
Assignee: Motorola Solutions Inc
•
Filing: 1982-12-22
•
Granted: 1985-01-15
•
Expires: 2002-12-22
Abstract
Abstract An antenna is provided which exhibits an overall shortened length with respect to the length of the conventional sleeve dipole type antenna. The antenna includes an upper radiating element coupled to a tank circuit to induce resonance at a first resonant frequency and further includes a helical element electrically coupled to a sleeve member which cooperate to resonate at a second resonant frequency.
Inventors
- 👤 Oscar M. Garay
- 👤 Quirino Balzano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:23
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q5/00; H01Q5/30; H01Q5/307; H01Q5/314; H01Q5/342; H01Q5/357
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
An antenna exhibiting first and second predetermined resonant frequencies comprising: a helically configured electrically conductive element having opposed ends, one end of said element being electrically coupled to a feed port; a first electrically conductive, cylindrically shaped member having opposed ends, one end of said member being electrically coupled to the remaining end of said element, such that when radio frequency energy is applied to said feed port, said element and said first member cooperate to resonate at a first frequency; a second electrically conductive member having opposed ends, one end of said second member being electrically coupled to said feedport; said first and second members and said element being substantially aligned so as to share a common axis between the respective ends thereof, and resonant circuit means, electrically coupled to the remaining end of said second member, such that when radio frequency energy is applied to said feed port, said second member and said resonant circuit means cooperate to resonate at a second resonant frequency.
Claim 2
Dependent Claim
166 words
An antenna exhibiting first and second predetermined resonant frequencies comprising: a helically configured electrically conductive element having opposed ends, one end of said element being electrically coupled to a feed port; a first electrically conductive, cylindrically shaped member having opposed ends, one end of said member being electrically coupled to the remaining end of said element, such that when radio frequency energy is applied to said feed port, said element and said first member cooperate to resonate at a first frequency; a second electrically conductive member having opposed ends, one end of said second member being electrically coupled to said feedport; said first and second members and said element being substantially aligned so as to share a common axis between the respective ends thereof, and resonant circuit means, electrically coupled to the remaining end of said second member, such that when radio frequency energy is applied to said feed port, said second member and said resonant circuit means cooperate to resonate at a second resonant frequency.
Claim 3
Dependent Claim
64 words
The antenna of claim 1 including a coaxial feedline having a center conductor and a ground conductor situated within said first member and said element, said center conductor being electrically coupled to the end of said second member which is coupled to said feed port, said ground conductor being electrically coupled to the end of said element which is coupled to said feed port.
Claim 4
Dependent Claim
25 words
The antenna of claim 1 wherein said resonant circuit means comprises a tank circuit including a capacitor and an inductor electrically coupled together in parallel.
Claim 5
Dependent Claim
187 words
An antenna exhibiting dips in return loss at first and second predetermined frequencies comprising: a helically configured electrically conductive element having opposed ends, one end of said element being electrically coupled to a feed port; a first electrically conductive, cylindrically shaped member having opposed ends, one end of said member being electrically coupled to an end of said element, such that when radio frequency energy is applied to said feed port, said element and said first member cooperate to exhibit a dip in return loss at said first frequency at said feed port; a second electrically conductive member having opposed ends, one end of said second member being electrically coupled to said feed port; said first and second members and said element being substantially aligned so as to share a common axis between the respective ends thereof, and resonant circuit means, electrically coupled to the remaining end of said second member, such that when radio frequency energy is applied to said feed port, said second member and said resonant circuit means cooperate to exhibit a dip in return loss at said second frequency at said feed port.
Claim 6
Dependent Claim
187 words
An antenna exhibiting dips in return loss at first and second predetermined frequencies comprising: a helically configured electrically conductive element having opposed ends, one end of said element being electrically coupled to a feed port; a first electrically conductive, cylindrically shaped member having opposed ends, one end of said member being electrically coupled to an end of said element, such that when radio frequency energy is applied to said feed port, said element and said first member cooperate to exhibit a dip in return loss at said first frequency at said feed port; a second electrically conductive member having opposed ends, one end of said second member being electrically coupled to said feed port; said first and second members and said element being substantially aligned so as to share a common axis between the respective ends thereof, and resonant circuit means, electrically coupled to the remaining end of said second member, such that when radio frequency energy is applied to said feed port, said second member and said resonant circuit means cooperate to exhibit a dip in return loss at said second frequency at said feed port.
Claim 7
Dependent Claim
25 words
The antenna of claim 4 wherein said resonant circuit means comprises a tank circuit including a capacitor and an inductor electrically coupled together in parallel.
References Cited (Backward Citations)
US2184729A
Cited
US2311472A
Cited
US2492404A
Cited
US2615131A
Cited
US2648771A
Cited
US2826756A
Cited
US2821709A
Cited
US2898590A
Cited
US2875443A
Cited
US3048845A
Cited
US3541567A
Cited
US3689928A
Cited
US3902178A
Cited
US3932873A
Cited
US4097867A
Cited
US4008479A
Cited
US4137534A
Cited
US4229743A
Cited
US4204212A
Cited
US4425565A
Cited
US4442438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |