US3571716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronically tuned antenna system
Assignee: Motorola Solutions Inc
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Filing: 1968-04-16
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Granted: 1971-03-23
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Expires: 1988-04-16
Abstract
Abstract A tank circuit for the aerial of a radio receiver includes a transformer located in a housing positioned at the bottom of the aerial with the primary winding electrically connected to the aerial. A voltage variable capacitor is connected across the primary winding. The secondary winding of the transformer is connected by a coaxial cable to the radio receiver which is remotely positioned from the aerial. A direct current potential from a potentiometer in the radio receiver is coupled through the coaxial cable to the voltage variable capacitor for tuning the antenna tank circuit over a predetermined frequency band. The selected RF signal in turn is coupled from the secondary winding of the transformer through the coaxial cable to the radio receiver.
Inventors
- 👤 Fred P Hill
- 👤 Richard T Race
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:30
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H03H7/40; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
An antenna system for wave signal apparatus, including in combination, an aerial, a housing, antenna tank circuit means positioned in said housing, said housing being mechanically connected to said aerial at the base thereof with said tank circuit means being electrically connected to said aerial, said tank circuit means including a transformer having a voltage variable reactance means connected across the primary winding thereof, circuit means connected to said voltage variable reactance means and applying a variable bias potential thereto for selectively tuning said antenna tank circuit means to a predetermined frequency and coupling means including a conductor connected to the secondary winding of said transformer for coupling signals at the predetermined frequency to the wave signal apparatus whereby the reactance of said conductor is across the secondary winding thereby providing greatly reduced attenuation of the wave signal between said aerial and the wave signal apparatus.
Claim 2
Dependent Claim
146 words
An antenna system for wave signal apparatus, including in combination, an aerial, a housing, antenna tank circuit means positioned in said housing, said housing being mechanically connected to said aerial at the base thereof with said tank circuit means being electrically connected to said aerial, said tank circuit means including a transformer having a voltage variable reactance means connected across the primary winding thereof, circuit means connected to said voltage variable reactance means and applying a variable bias potential thereto for selectively tuning said antenna tank circuit means to a predetermined frequency and coupling means including a conductor connected to the secondary winding of said transformer for coupling signals at the predetermined frequency to the wave signal apparatus whereby the reactance of said conductor is across the secondary winding thereby providing greatly reduced attenuation of the wave signal between said aerial and the wave signal apparatus.
Claim 3
Dependent Claim
144 words
In an antenna system for a radio receiver having a plurality of signal processing stages tunable in response to an applied direct current potential over a predetermined frequency range and being remotely positioned from the receiver aerial, the combination including, an aerial, a housing mechanically connected to said aerial at the base thereof, an antenna tank circuit including a transformer located in the Housing, said transformer having a primary and secondary winding, said primary winding being electrically connected to said aerial, said tank circuit further including a voltage variable capacitor coupled across said primary winding and being responsive to a direct current potential applied thereto for tuning said tank circuit to a predetermined radio frequency, and coupling means connected to said secondary winding of said transformer and coupling the selected radio frequency signal from said tank circuit to the radio receiver remotely positioned therefrom.
Claim 4
Dependent Claim
144 words
In an antenna system for a radio receiver having a plurality of signal processing stages tunable in response to an applied direct current potential over a predetermined frequency range and being remotely positioned from the receiver aerial, the combination including, an aerial, a housing mechanically connected to said aerial at the base thereof, an antenna tank circuit including a transformer located in the Housing, said transformer having a primary and secondary winding, said primary winding being electrically connected to said aerial, said tank circuit further including a voltage variable capacitor coupled across said primary winding and being responsive to a direct current potential applied thereto for tuning said tank circuit to a predetermined radio frequency, and coupling means connected to said secondary winding of said transformer and coupling the selected radio frequency signal from said tank circuit to the radio receiver remotely positioned therefrom.
Claim 5
Dependent Claim
99 words
The radio receiver of claim 2 further including variable voltage means providing a direct current potential to selected signal processing stages of the radio receiver for tuning the same over the predetermined frequency range, and wherein said coupling means includes a coaxial cable, said coaxial cable coupling said direct current potential from said variable voltage means to said voltage variable capacitor so that said tank circuit is tuned to the same radio frequency as the selected signal processing stages of the radio receiver, said coaxial cable further coupling selected radio frequencies from said tank circuit to the radio receiver.
Claim 6
Dependent Claim
158 words
An antenna system for a radio receiver having a plurality of signal processing stages and a remotely located aerial, including in combination, a housing connected to the aerial, a transformer located in said housing and having a primary and secondary winding, a voltage variable capacitor coupled across said primary winding and forming a tank circuit, said tank circuit being connected to said aerial, a potentiometer providing a direct current potential, circuit means for connecting said potentiometer to said voltage variable capacitor, said potentiometer varying the bias on said voltage variable capacitor to tune said tank circuit to a predetermined radio frequency signal, a radio frequency amplifier stage positioned in said housing remote from the radio receiver, said secondary winding of said transformer coupling said signal at said predetermined frequency to said radio frequency amplifier stage, and conductor means for connecting said amplifier stage to the remaining signal processing stages of the radio receiver positioned remotely from said aerial.
Claim 7
Dependent Claim
158 words
An antenna system for a radio receiver having a plurality of signal processing stages and a remotely located aerial, including in combination, a housing connected to the aerial, a transformer located in said housing and having a primary and secondary winding, a voltage variable capacitor coupled across said primary winding and forming a tank circuit, said tank circuit being connected to said aerial, a potentiometer providing a direct current potential, circuit means for connecting said potentiometer to said voltage variable capacitor, said potentiometer varying the bias on said voltage variable capacitor to tune said tank circuit to a predetermined radio frequency signal, a radio frequency amplifier stage positioned in said housing remote from the radio receiver, said secondary winding of said transformer coupling said signal at said predetermined frequency to said radio frequency amplifier stage, and conductor means for connecting said amplifier stage to the remaining signal processing stages of the radio receiver positioned remotely from said aerial.
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |