US3573628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna for miniature radio receiver including portions of receiver housing and chassis
Assignee: Motorola Solutions Inc
•
Filing: 1968-07-15
•
Granted: 1971-04-06
•
Expires: 1988-07-15
Abstract
Abstract Antenna for radio receiver of the capacitively loaded vertical ground plane type wherein an active vertical portion is formed by parts of the receiver and is connected to a conductive escutcheon to form a capacitive loading structure for the vertical antenna. The lower end of the vertical antenna is connected to shield cans and grounded conductors on the chassis which form an effective ground plane. The signal from the top of the vertical antenna is coupled through a matching circuit to the base of a transistor. A jack for connecting an external antenna is connected between the ground plane and a point on the vertical antenna.
Inventors
- 👤 Joseph F Cramer Jr
- 👤 Thomas M Yackish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:16
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/243
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
116 words
An antenna for a miniature radio device having an insulating housing with a part thereon formed of conductive material, and having a chassis within the housing with conducting means at a reference potential, such antenna including conductor means extending vertically within the housing when the radio device is in the position of use to form an active antenna element, first conductive means connecting the upper end of said conductor means to the conductive part of the housing and forming therewith a capacitor for loading said antenna element, and second conductive means connecting the lower end of said conductor means to the conducting means of the chassis to form an effective ground plane for said antenna element.
Claim 2
Dependent Claim
116 words
An antenna for a miniature radio device having an insulating housing with a part thereon formed of conductive material, and having a chassis within the housing with conducting means at a reference potential, such antenna including conductor means extending vertically within the housing when the radio device is in the position of use to form an active antenna element, first conductive means connecting the upper end of said conductor means to the conductive part of the housing and forming therewith a capacitor for loading said antenna element, and second conductive means connecting the lower end of said conductor means to the conducting means of the chassis to form an effective ground plane for said antenna element.
Claim 3
Dependent Claim
29 words
The antenna of claim 1 wherein said conductor means is formed of a plurality of parts, at least one of which has a further function in the radio device.
Claim 4
Dependent Claim
26 words
The antenna of claim 1 including conducting shield cans on the chassis which form at least a part of the ground plane for said antenna element.
Claim 5
Dependent Claim
108 words
A miniature radio receiver including in combination, an insulating housing having an escutcheon thereon formed of conductive material, a chassis within the housing with conducting means at a reference potential, conductor means on said chassis extending vertically within the housing when the receiver is in the position of use to form an active antenna element, first conductive means connecting the upper end of said conductor means to said escutcheon and forming therewith a capacitor for loading said antenna element, anD second conductive means connecting the lower end of said conductor means to said conducting means of said chassis to form an effective ground plane for said antenna element.
Claim 6
Dependent Claim
108 words
A miniature radio receiver including in combination, an insulating housing having an escutcheon thereon formed of conductive material, a chassis within the housing with conducting means at a reference potential, conductor means on said chassis extending vertically within the housing when the receiver is in the position of use to form an active antenna element, first conductive means connecting the upper end of said conductor means to said escutcheon and forming therewith a capacitor for loading said antenna element, anD second conductive means connecting the lower end of said conductor means to said conducting means of said chassis to form an effective ground plane for said antenna element.
Claim 7
Dependent Claim
28 words
The structure of claim 4 including a conductive bracket which forms a part of said conductor means and which has a portion in electrical connection with said escutcheon.
Claim 8
Dependent Claim
41 words
The structure of claim 5 wherein said bracket supports a jack for connecting an external antenna to the receiver, and said jack has a first connector connected to said conductor means and a second connector connected to said second conductive means.
Claim 9
Dependent Claim
37 words
The structure of claim 4 wherein said escutcheon includes a conductive finger, and wherein said conductor means and said first conductive means are formed in part by a conductive bracket having a portion engaging said conductive finger.
Claim 10
Dependent Claim
32 words
The structure of claim 4 including a transistor forming the first stage of the receiver, and a matching circuit connected from said first conductive means to said transistor for applying signals thereto.
Claim 11
Dependent Claim
50 words
The structure of claim 8 wherein said transistor has base, emitter and collector electrodes and said matching circuit is connected to said base electrode, and including means connecting said emitter electrode to said second conductive means, and tuned circuit means connected between said collector electrode and said second conductive means.
Claim 12
Dependent Claim
39 words
The structure of claim 9 including conductive shield cans on said chassis which form at least a part of the ground plane, and wherein said transistor and said tuned circuit means are provided in one of said shield cans.
References Cited (Backward Citations)
US2840694A
Cited
US3307108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |