US4814776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optimally grounded small loop antenna
Assignee: Quarterhill Inc
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Filing: 1987-09-10
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Granted: 1989-03-21
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Expires: 2007-09-10
Abstract
Abstract A small closed loop antenna is formed by a flat metal member formed into a U-shape which also serves as the front, back and top surfaces, or parts thereof, of the housing for a portable communications receiver. Connected to the open (bottom) end of the arms is an isolation network providing an optimum antenna ground and a reactance network which applies a capacitive reactance across the antenna and isolation network so that the conductive member forms an antenna that detects the H-field of the electromagnetic wave to be received. The reactance network is tunable to adjust the antenna for reception at particular frequencies.
Inventors
- 👤 Joseph D. Caci
- 👤 Lorenzo A. Ponce de Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:27
CPC Classifications
H; H01; H01Q; H01Q7/00; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/243
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
125 words
An optimally coupled loop antenna for a miniature portable radio receiver, comprising: a flat conductive member formed in a U-shaped configuration having first and second elongated substantially parallel arms and a connecting portion connecting said arms, said arms having a length greater than that of said connecting portion, said conductive member forming a part of the housing of the receiver with said arms extending substantially vertical in a normal position of the receiver; isolation means, coupled between the end of said first arm opposite said connecting portion and a receiver ground; and reactance means, coupled between the end of said second arm opposite said connecting portion and the receiver ground, said reactance means presenting a capacitive reactance across said conductive member and said isolation means.
Claim 2
Dependent Claim
125 words
An optimally coupled loop antenna for a miniature portable radio receiver, comprising: a flat conductive member formed in a U-shaped configuration having first and second elongated substantially parallel arms and a connecting portion connecting said arms, said arms having a length greater than that of said connecting portion, said conductive member forming a part of the housing of the receiver with said arms extending substantially vertical in a normal position of the receiver; isolation means, coupled between the end of said first arm opposite said connecting portion and a receiver ground; and reactance means, coupled between the end of said second arm opposite said connecting portion and the receiver ground, said reactance means presenting a capacitive reactance across said conductive member and said isolation means.
Claim 3
Dependent Claim
16 words
The antenna according to claim 1 wherein said conductive member functions as an inductive loop antenna.
Claim 4
Dependent Claim
34 words
The antenna according to claim 1 wherein said reactance means is adjustable to select a value of said capacitive reactance to tune the conductive member for reception of the H-field of an electromagnetic wave.
Claim 5
Dependent Claim
35 words
The antenna according to claim 1 wherein said isolation means comprises: an inductor; and a capacitor in parallel with said inductor and parallel resonant with said inductor at a frequency of operation of the receiver.
Claim 6
Dependent Claim
24 words
The antenna according to claim 4 wherein said capacitor is the stray capacitance resultant from coupling between said conductive member and said receiver ground.
Claim 7
Dependent Claim
142 words
An optimally coupled loop antenna for a miniature portable radio receiver, comprising: a flat conductive member formed in a U-shaped configuration having first and second elongated substantially parallel arms and a connecting portion connecting said arms, said conductive member forming a part of the housing of the receiver wherein said arms constitute at least a part of the front and back surfaces and said connecting portion constituting at least a part of the top surface of the housing, said arms of said conductive member extending vertically in a normal position of the receiver; isolation means, coupled between the end of said first arm opposite said connecting portion and a receiver ground; and reactance means coupled between the end of said second arm opposite to said connecting portion and the receiver ground, for deriving signals therefrom and delivering the signals to said receiver.
Claim 8
Dependent Claim
142 words
An optimally coupled loop antenna for a miniature portable radio receiver, comprising: a flat conductive member formed in a U-shaped configuration having first and second elongated substantially parallel arms and a connecting portion connecting said arms, said conductive member forming a part of the housing of the receiver wherein said arms constitute at least a part of the front and back surfaces and said connecting portion constituting at least a part of the top surface of the housing, said arms of said conductive member extending vertically in a normal position of the receiver; isolation means, coupled between the end of said first arm opposite said connecting portion and a receiver ground; and reactance means coupled between the end of said second arm opposite to said connecting portion and the receiver ground, for deriving signals therefrom and delivering the signals to said receiver.
Claim 9
Dependent Claim
38 words
The antenna according to claim 6 including spring biased contact means engaging said arms at the ends thereof opposite to said connecting portion for making electrical connections between said arms and said isolation means and said reactance network.
Claim 10
Dependent Claim
34 words
The antenna according to claim 6 wherein said reactance means is adjustable to select a value of said capacitive reactance to tune the conductive member for reception of the H-field of an electromagnetic wave.
Claim 11
Dependent Claim
35 words
The antenna according to claim 6 wherein said isolation means comprises: an inductor; and a capacitor in parallel with said inductor and parallel resonant with said inductor at a frequency of operation of the receiver.
Claim 12
Dependent Claim
25 words
The antenna according to claim 9 wherein said capacitor is the stray capacitance resultant from coupling between said U-shaped conductive member and the receiver ground.
Claim 13
Dependent Claim
126 words
An optimally coupled loop antenna for a miniature portable radio receiver having a housing, said antenna comprising: a flat conductive member formed in a U-shaped configuration having first and second elongated substantially parallel arms and a connecting portion connecting said arms, said arms having a length greater than that of said connecting portion, said conductive member concealed within the housing with said arms extending substantially vertical in a normal position of the receiver; isolation means, coupled between the end of said first arm opposite said connecting portion and a receiver ground; and reactance means coupled between the end of said second arm opposite to said connecting portion and the receiver ground, said reactance means presenting a capacitive reactance across said conductive member and said isolation means.
Claim 14
Dependent Claim
126 words
An optimally coupled loop antenna for a miniature portable radio receiver having a housing, said antenna comprising: a flat conductive member formed in a U-shaped configuration having first and second elongated substantially parallel arms and a connecting portion connecting said arms, said arms having a length greater than that of said connecting portion, said conductive member concealed within the housing with said arms extending substantially vertical in a normal position of the receiver; isolation means, coupled between the end of said first arm opposite said connecting portion and a receiver ground; and reactance means coupled between the end of said second arm opposite to said connecting portion and the receiver ground, said reactance means presenting a capacitive reactance across said conductive member and said isolation means.
Claim 15
Dependent Claim
16 words
The antenna according to claim 11 wherein said conductive member functions as an inductive loop antenna.
Claim 16
Dependent Claim
34 words
The antenna according to claim 11 wherein said reactance means is adjustable to select a value of said capacitive reactance to tune the conductive member for reception of the H-field of an electromagnetic wave.
Claim 17
Dependent Claim
35 words
The antenna according to claim 11 wherein said isolation means comprises: an inductor; and a capacitor in parallel with said inductor and parallel resonant with said inductor at a frequency of operation of the receiver.
Claim 18
Dependent Claim
24 words
The antenna according to claim 14 wherein said capacitor is the stray capacitance resultant from coupling between said conductive member and said receiver ground.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |