US3778731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuning method for t-network couplers
Assignee: Cincinnati Electronics Corp
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Filing: 1972-06-05
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Granted: 1973-12-11
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Expires: 1992-06-05
Abstract
Abstract Disclosed herein is a method for tuning a T-network coupler and matching an antenna to a transmitter output. With both input and output inductances of the coupler at values such that the impedance is in a capacitive region of the Smith Chart and within a predetermined resistance circle (say 50 ohms) the value of the output inductance is first increased until said resistance circle is traversed (moving in the direction of less resistance), as sensed by a loading or resistance detector. The input inductance is then increased until the resistance value again traverses said resistance circle, going in the direction of greater resistance. The resistance detector senses this. Then the first and second steps are repeated. The process continues until the phase detector indicates that the phase angle is zero. In any case wherein the impedance is in an inductive region the output inductance is decreased only when the resistance is less than that of the load (50 ohms, for example) and the input inductance is decreased only if the resistance is greater than that of the load.
Inventors
- 👤 J Oomen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:20
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H03H7/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
173 words
A method of matching an r.f. load to a source so that there is presented to the source an impedance having predetermined real and reactive values, a tuning network being connected in circuit with said source and load, said network including an input inductor and an output inductor, said inductors being connected in series between the source and load and a capacitor shunting a connection between the inductors, the method cOmprising: (1) sensing the real and reactive components presented to the source, (2) in response to the sensed real and reactive components deviating from the predetermined values, adjusting one of the inductors until the sensed real value crosses the predetermined real value in a first direction, (3) then in response to the then sensed reactive component deviating from the predetermined reactive value adjusting the other inductor until the sensed real value crosses the predetermined real value in the other driection, and (4) then iteratively continuing steps (2) and (3) until the sensed reactive component is at the predetermined value for the reactive component.
Claim 2
Independent Claim
173 words
A method of matching an r.f. load to a source so that there is presented to the source an impedance having predetermined real and reactive values, a tuning network being connected in circuit with said source and load, said network including an input inductor and an output inductor, said inductors being connected in series between the source and load and a capacitor shunting a connection between the inductors, the method cOmprising: (1) sensing the real and reactive components presented to the source, (2) in response to the sensed real and reactive components deviating from the predetermined values, adjusting one of the inductors until the sensed real value crosses the predetermined real value in a first direction, (3) then in response to the then sensed reactive component deviating from the predetermined reactive value adjusting the other inductor until the sensed real value crosses the predetermined real value in the other driection, and (4) then iteratively continuing steps (2) and (3) until the sensed reactive component is at the predetermined value for the reactive component.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the values of both inductors are varied in the same direction during each of steps (2), (3) and (4).
Claim 4
Dependent Claim
91 words
The method of claim 1 wherein: in response to the sensed reactive component being at a phase angle less than the phase angle associated with the predetermined reactive value and the sensed real component being greater than the predetermined real value, increasing the value of the output inductor; and in response to the sensed reactive component being at a phase angle less than the phase angle associated with the predetermined reactive value and the sensed real value being less than the predetermined real value, increasing the value of the input inductor.
Claim 5
Dependent Claim
91 words
The method of claim 1 wherein: in response to the sensed reactive component being at a phase angle greater than the phase angle associated with the predetermined reactive value and the sensed real component being greater than the predetermined real value, decreasing the value of the input inductor; and, in response to the sensed reactive component being at a phase angle greater than the phase angle associated with the predetermined reactive value and the sensed real value being less than the predetermined real value, decreasing the value of the output inductor.
Claim 6
Dependent Claim
175 words
The method of claim 1 wherein: in response to the sensed reactive component being at a phase angle less than the phase angle associated with the predetermined reactive value and the sensed real component being greater than the predetermined real value, increasing the value of the output inductor; in response to the sensed reactive component being at a phase angle less than the phase angle associated with the predetermined reactive value and the sensed real value being less than the predetermined real value, increasing the value of the input inductor; in response to the sensed reactive component being at a phase angle greater than the phase angle associated with the predetermined reactive value and the sensed real component being greater than the predetermined real value, decreasing the value of the input inductor; and in response to the sensed reactive component being at a phase angle greater than the phase angle associated with the predetermined reactive value and the sensed real value being less than the predetermined real value, decreasing the value of the output inductor.
Claim 7
Independent Claim
222 words
A method of matching an r.f. load to a source so that there is presented to the source an impedance having predetermined real and reactive values, a tuning network being connected in circuit with said source and load, said network including an input reactance and an output reactance, said reactances being of the same type and connected in series between the source and load and having a range of values over which they are variable between a low limit value and a high limit value, a shunt reactance of a type opposite from the type of reactances of the input and output reactances, said shunt reactance being connected between the input and output reactances, the method comprising: initially setting both the series reactances at one of the limit values thereof, both of said limit values being in the same direction, sensing the real and reactive impedance components seen by the source, varying one of said series reactances toward the other limit value until the sensed real component pasSes through the predetermined value therefor in a first direction, varying the other series reactance toward the other limit value until the sensed real component passes through the predetermined value therefor in the other direction, and iteratively repeating the previously defined varying steps in sequence until the predetermined value of the reactive component is sensed.
Claim 8
Independent Claim
222 words
A method of matching an r.f. load to a source so that there is presented to the source an impedance having predetermined real and reactive values, a tuning network being connected in circuit with said source and load, said network including an input reactance and an output reactance, said reactances being of the same type and connected in series between the source and load and having a range of values over which they are variable between a low limit value and a high limit value, a shunt reactance of a type opposite from the type of reactances of the input and output reactances, said shunt reactance being connected between the input and output reactances, the method comprising: initially setting both the series reactances at one of the limit values thereof, both of said limit values being in the same direction, sensing the real and reactive impedance components seen by the source, varying one of said series reactances toward the other limit value until the sensed real component pasSes through the predetermined value therefor in a first direction, varying the other series reactance toward the other limit value until the sensed real component passes through the predetermined value therefor in the other direction, and iteratively repeating the previously defined varying steps in sequence until the predetermined value of the reactive component is sensed.
Claim 9
Dependent Claim
46 words
The method of claim 6 wherein both of the series reactances are inductors and the shunt reactance is a capacitor and wherein the inductors are initially set at low limit values therefor, and the values of the inductors are increased during each of the varying steps.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |