US3587017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overvoltage protecting arrangement for an rf amplifier
Assignee: Fujitsu Ltd
•
Filing: 1967-11-27
•
Granted: 1971-06-22
•
Expires: 1987-11-27
Abstract
Abstract An overvoltage-protecting arrangement comprises a filter connected between an antenna and the input of an RF amplifier for providing impedance matching between the antenna and the amplifier. A diode is connected between the inductor of the filter at a point having an inductance L 1/ omega 2C and a point at ground potential, C being the capacitance between the antenna and ground, omega being 2 pi f and f being the operating frequency of the arrangement. The diode has a zener diode characteristic and is switched to its conductive condition when the antenna supplies a high voltage signal to the filter thereby providing an impedance mismatch between the antenna and the filter.
Inventors
- 👤 Michio Kurusu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:22
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H03; H03F; H03F1/00; H03F1/52; H03F3/00; H03F3/189; H03F3/19; H03F3/191
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
245 words
An overvoltage-protecting arrangement for an RF amplifier having an input from an overvoltage in an antenna coupled to the input of said RF amplifier, said RF amplifier including an inputcoupling transformer having an input winding and an output winding inductively coupled to said input winding said overvoltage-protecting arrangement comprising filter means connected between said antenna and the input of said RF amplifier for providing impedance matching between said antenna and said RF amplifier, said filter means comprising an inductor connected in series between said antenna and the input winding of the input-coupling transformer of said RF amplifier, said inductor having a pair of spaced opposite ends, a first capacitor connected between one end of said inductor and a point at ground potential and a second capacitor connected between the other end of said inductor and a point at ground potential; and a diode connected between the inductor of said filter means at a portion of the inductor having an inductance L 1/ omega 2C and a point at ground potential and across the output winding of the input-coupling transformer of said RF amplifier, wherein C is the capacitance between said antenna and ground and omega is 2 pi f, f being the operating frequency of said arrangement, said diode having a Zener diode characteristic and being switched to its conductive condition when said antenna supplies a high voltage signal to said filter means thereby providing an impedance mismatch between said antenna and said RF amplifier.
Claim 2
Dependent Claim
245 words
An overvoltage-protecting arrangement for an RF amplifier having an input from an overvoltage in an antenna coupled to the input of said RF amplifier, said RF amplifier including an inputcoupling transformer having an input winding and an output winding inductively coupled to said input winding said overvoltage-protecting arrangement comprising filter means connected between said antenna and the input of said RF amplifier for providing impedance matching between said antenna and said RF amplifier, said filter means comprising an inductor connected in series between said antenna and the input winding of the input-coupling transformer of said RF amplifier, said inductor having a pair of spaced opposite ends, a first capacitor connected between one end of said inductor and a point at ground potential and a second capacitor connected between the other end of said inductor and a point at ground potential; and a diode connected between the inductor of said filter means at a portion of the inductor having an inductance L 1/ omega 2C and a point at ground potential and across the output winding of the input-coupling transformer of said RF amplifier, wherein C is the capacitance between said antenna and ground and omega is 2 pi f, f being the operating frequency of said arrangement, said diode having a Zener diode characteristic and being switched to its conductive condition when said antenna supplies a high voltage signal to said filter means thereby providing an impedance mismatch between said antenna and said RF amplifier.
Claim 3
Dependent Claim
228 words
An overvoltage-protecting arrangement for an RF amplifier having an input from an overvoltage in an antenna coupled to the input of said RF amplifier, said overvoltage-protecting arrangement comprising filter means connected between said antenna and the input of said RF amplifier for providing impedance matching between said antenna and said RF amplifier, said filter means comprising an inductor connected in series between said antenna and the input of said RF amplifier, said inductor having a pair of spaced opposite ends, a first capacitor connected between one end of said inductor and a point at ground potential and a second capacitor connected between the other end of said inductor and a point at ground potential; a diode connected between an end of the inductor of said filter means at a portion of the inductor having an inductance L 1/ omega 2C and a point at ground potential, wherein C is the capacitance between said antenna and ground and omega is 2 pi f, f being the operating frequency of said arrangement, said diode having a Zener diode characteristic and being switched to its conductive condition when said antenna supplies a high voltage signal to said filter means thereby providing an impedance mismatch between said antenna and said RF amplifier; and another inductor connected between an end of the inductor of said filter means and a point at ground potential.
Claim 4
Dependent Claim
228 words
An overvoltage-protecting arrangement for an RF amplifier having an input from an overvoltage in an antenna coupled to the input of said RF amplifier, said overvoltage-protecting arrangement comprising filter means connected between said antenna and the input of said RF amplifier for providing impedance matching between said antenna and said RF amplifier, said filter means comprising an inductor connected in series between said antenna and the input of said RF amplifier, said inductor having a pair of spaced opposite ends, a first capacitor connected between one end of said inductor and a point at ground potential and a second capacitor connected between the other end of said inductor and a point at ground potential; a diode connected between an end of the inductor of said filter means at a portion of the inductor having an inductance L 1/ omega 2C and a point at ground potential, wherein C is the capacitance between said antenna and ground and omega is 2 pi f, f being the operating frequency of said arrangement, said diode having a Zener diode characteristic and being switched to its conductive condition when said antenna supplies a high voltage signal to said filter means thereby providing an impedance mismatch between said antenna and said RF amplifier; and another inductor connected between an end of the inductor of said filter means and a point at ground potential.
Claim 5
Dependent Claim
228 words
An overvoltage-protecting arrangement for an RF amplifier having an input from an overvoltage in an antenna coupled to the input of said RF amplifier, said overvoltage-protecting arrangement comprising filter means connected between said antenna and the input of said RF amplifier for providing impedance matching between said antenna and said RF amplifier, said filter means comprising an inductor connected in series between said antenna and the input of said RF amplifier, said inductor having a pair of spaced opposite ends, a first capacitor connected between one end of said inductor and a point at ground potential and a second capacitor connected between the other end of said inductor and a point at ground potential; a diode connected between an end of the inductor of said filter means at a portion of the inductor having an inductance L 1/ omega 2C and a point at ground potential, wherein C is the capacitance between said antenna and ground and omega is 2 pi f, f being the operating frequency of said arrangement, said diode having a Zener diode characteristic and being switched to its conductive condition when said antenna supplies a high voltage signal to said filter means thereby providing an impedance mismatch between said antenna and said RF amplifier; and a resistor connected between an end of the inductor of said filter means and a point at ground potential.
Claim 6
Dependent Claim
228 words
An overvoltage-protecting arrangement for an RF amplifier having an input from an overvoltage in an antenna coupled to the input of said RF amplifier, said overvoltage-protecting arrangement comprising filter means connected between said antenna and the input of said RF amplifier for providing impedance matching between said antenna and said RF amplifier, said filter means comprising an inductor connected in series between said antenna and the input of said RF amplifier, said inductor having a pair of spaced opposite ends, a first capacitor connected between one end of said inductor and a point at ground potential and a second capacitor connected between the other end of said inductor and a point at ground potential; a diode connected between an end of the inductor of said filter means at a portion of the inductor having an inductance L 1/ omega 2C and a point at ground potential, wherein C is the capacitance between said antenna and ground and omega is 2 pi f, f being the operating frequency of said arrangement, said diode having a Zener diode characteristic and being switched to its conductive condition when said antenna supplies a high voltage signal to said filter means thereby providing an impedance mismatch between said antenna and said RF amplifier; and a resistor connected between an end of the inductor of said filter means and a point at ground potential.
Claim 7
Dependent Claim
224 words
An overvoltage-protecting arrangement for an RF amplifier having an input from an overvoltage in an antenna coupled to the input of said RF amplifier, said overvoltage-protecting arrangement comprising filter means connected between said antenna and the input of said RF amplifier for providing impedance matching between said antenna and said RF amplifier, said filter means comprising an inductor connected in series between said antenna and the input of said RF amplifier, said inductor having a pair of spaced opposite ends, a first capacitor connected between one end of said inductor and a point at ground potential and a second capacitor connected between the other end of said inductor and a point at ground potential, said inductor having a tap point; a diode connected between the tap point of the inductor of said filter means at a portion of the inductor having an inductance L 1/ omega 2C and a point at ground potential, wherein C is the capacitance between said antenna and grOund and omega is 2 pi f, f being the operating frequency of said arrangement, said diode having a Zener diode characteristic and being switched to its conductive condition when said antenna supplies a high voltage signal to said filter means thereby providing an impedance mismatch between said antenna and said RF amplifier; and another inductor connected in shunt with said diode.
Claim 8
Dependent Claim
224 words
An overvoltage-protecting arrangement for an RF amplifier having an input from an overvoltage in an antenna coupled to the input of said RF amplifier, said overvoltage-protecting arrangement comprising filter means connected between said antenna and the input of said RF amplifier for providing impedance matching between said antenna and said RF amplifier, said filter means comprising an inductor connected in series between said antenna and the input of said RF amplifier, said inductor having a pair of spaced opposite ends, a first capacitor connected between one end of said inductor and a point at ground potential and a second capacitor connected between the other end of said inductor and a point at ground potential, said inductor having a tap point; a diode connected between the tap point of the inductor of said filter means at a portion of the inductor having an inductance L 1/ omega 2C and a point at ground potential, wherein C is the capacitance between said antenna and grOund and omega is 2 pi f, f being the operating frequency of said arrangement, said diode having a Zener diode characteristic and being switched to its conductive condition when said antenna supplies a high voltage signal to said filter means thereby providing an impedance mismatch between said antenna and said RF amplifier; and another inductor connected in shunt with said diode.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |