Patent US3906405A successfully refreshed from Google Patents.
US3906405A
Expired / Lapsed
US
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Tunable antenna coupling circuit
Assignee: Motorola Solutions Inc
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Filing: 1974-07-01
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Granted: 1975-09-16
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Expires: 1994-07-01
Abstract
Abstract Tunable antenna coupling circuit for applying signals of different frequencies between an antenna and a transmitterreceiver, including a series circuit having a plurality of inductance sections and one or more shunt circuits providing capacitance between the series circuit and a reference potential. Reed switches are connected across the inductance sections, and selectively connect the capacitors in the shunt circuits, to thereby control the effective values in the circuit to match the impedance of the antenna at different frequencies to efficiently apply signals between the antenna and the transmitter-receiver. The reed switches are controlled by a channel selector having positions for the different channels (frequencies) to be used, which is coupled to the reed switches through a diode matrix for selectively operating the switches. The position of the channel selector controls the operation of predetermined ones of the reed switches to provide the desired coupling impedances for each channel. The values of inductance of the sections and the values of the capacitors have a binary relation so that by the selective connection thereof in the coupling circuit, a wide range of inductance values and capacitance values are obtained in small incremental steps.
Inventors
- 👤 Richard S Kommrusch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:24
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H03H7/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
348 words
A tunable coupling circuit for applying signals of different frequencies between a first signal translating device and a second signal translating device for matching the impedance of the translating devices and efficiently coupling signals therebetween, such coupling circuit including in combination, a series circuit connected between the first and second translating devices and including a plurality of inductance coil sections connected in series, a shunt circuit connected between said series circuit and a reference potential and including a plurality of capacitorS, switch means including a first plurality of switches having contacts individually connected across said coil sections for selectively shunting said coil sections in said series circuit and a second plurality of switches having contacts individually connected to said capacitors for selectively connecting said capacitors in parallel in said shunt circuit, a certain one or more of said first plurality of switches and a certain one or more of said second plurality of switches when actuated effect tuning of said coupling circuit to a particular one of said different frequencies, matrix means having input lines and output lines, each one of said input lines having one-way connections with one or more of said output lines, which connections for each input line being associated with a particular one of said different frequencies, one each of said output lines being connected to a respective one each of said first plurality and said second plurality of switches, and selector means for tuning the coupling circuit to one of said different frequencies, said selector means including a plurality of conductors, each one of said conductors being associated with a particular one of said different frequencies, the conductor of said selector means associated with a particular one of said different frequencies being connected to the input conductor of said matrix means for that same frequency, and means for selectively connecting one of said plurality of conductors to a given potential for defining a circuit through said selector and the circuit of said matrix to those switches of said first plurality of switches and said second plurality of switches associated with the particular frequency.
Claim 2
Dependent Claim
348 words
A tunable coupling circuit for applying signals of different frequencies between a first signal translating device and a second signal translating device for matching the impedance of the translating devices and efficiently coupling signals therebetween, such coupling circuit including in combination, a series circuit connected between the first and second translating devices and including a plurality of inductance coil sections connected in series, a shunt circuit connected between said series circuit and a reference potential and including a plurality of capacitorS, switch means including a first plurality of switches having contacts individually connected across said coil sections for selectively shunting said coil sections in said series circuit and a second plurality of switches having contacts individually connected to said capacitors for selectively connecting said capacitors in parallel in said shunt circuit, a certain one or more of said first plurality of switches and a certain one or more of said second plurality of switches when actuated effect tuning of said coupling circuit to a particular one of said different frequencies, matrix means having input lines and output lines, each one of said input lines having one-way connections with one or more of said output lines, which connections for each input line being associated with a particular one of said different frequencies, one each of said output lines being connected to a respective one each of said first plurality and said second plurality of switches, and selector means for tuning the coupling circuit to one of said different frequencies, said selector means including a plurality of conductors, each one of said conductors being associated with a particular one of said different frequencies, the conductor of said selector means associated with a particular one of said different frequencies being connected to the input conductor of said matrix means for that same frequency, and means for selectively connecting one of said plurality of conductors to a given potential for defining a circuit through said selector and the circuit of said matrix to those switches of said first plurality of switches and said second plurality of switches associated with the particular frequency.
Claim 3
Dependent Claim
18 words
A tunable coupling circuit in accordance with claim 1 wherein said selector means includes a channel selector switch.
Claim 4
Dependent Claim
19 words
A tunable coupling circuit in accordance with claim 1 wherein the one-way connections of said matrix means comprises diodes.
Claim 5
Dependent Claim
352 words
A tunable coupling circuit for connecting an antenna to a radio transmitter-receiver for matching the impedance of the antenna and efficiently applying signals of different frequencies from the transmitter to the antenna and from the antenna to the radio receiver, such coupling circuit including in combination, a series circuit connected between the antenna and the radio and including a plurality of inductors connected in series, a shunt circuit connected between said series circuit and a reference potential and including a plurality of capacitors, switch means including a first plurality of switches having contacts individually connected across said inductors for selectively shunting the same and a second plurality of switches having contacts individually connected in series with said capacitors for selectively connecting the same in parallel in said shunt circuit, a certain one or more of said first plurality of switches and a certain one or more of said second plurality of switches when actuated effect tuning of said coupling circuit to a particular one of said different frequencies, matrix means having a plurality of input lines and a plurality of output lines, each one of said input lines having one-way connections with one or more of said output lines, which connections for each input line being associated with a particular one of said different frequencies, one each of said output lines being connected to a respective one each of said first plurality and said second plurality of switches, and, selector means for tuning the coupling circuit to one of said different frequencies, said selector means including a plurality of conductors, each one of said conductors being associated with a particular one of said different frequencies, the conductor of said selector means associated with a particular one of said different frequencies being connected to the input conductor of said matrix means for that same frequency, and means for selectively connecting one of said plurality of conductors to a given potential for defining a circuit through said selector and the circuit of said matrix to those switches of said first plurality of switches and said second plurality of switches associated with the particular frequency.
Claim 6
Dependent Claim
352 words
A tunable coupling circuit for connecting an antenna to a radio transmitter-receiver for matching the impedance of the antenna and efficiently applying signals of different frequencies from the transmitter to the antenna and from the antenna to the radio receiver, such coupling circuit including in combination, a series circuit connected between the antenna and the radio and including a plurality of inductors connected in series, a shunt circuit connected between said series circuit and a reference potential and including a plurality of capacitors, switch means including a first plurality of switches having contacts individually connected across said inductors for selectively shunting the same and a second plurality of switches having contacts individually connected in series with said capacitors for selectively connecting the same in parallel in said shunt circuit, a certain one or more of said first plurality of switches and a certain one or more of said second plurality of switches when actuated effect tuning of said coupling circuit to a particular one of said different frequencies, matrix means having a plurality of input lines and a plurality of output lines, each one of said input lines having one-way connections with one or more of said output lines, which connections for each input line being associated with a particular one of said different frequencies, one each of said output lines being connected to a respective one each of said first plurality and said second plurality of switches, and, selector means for tuning the coupling circuit to one of said different frequencies, said selector means including a plurality of conductors, each one of said conductors being associated with a particular one of said different frequencies, the conductor of said selector means associated with a particular one of said different frequencies being connected to the input conductor of said matrix means for that same frequency, and means for selectively connecting one of said plurality of conductors to a given potential for defining a circuit through said selector and the circuit of said matrix to those switches of said first plurality of switches and said second plurality of switches associated with the particular frequency.
Claim 7
Dependent Claim
37 words
A tunable coupling circuit in accordance with claim 4 wherein said switches are reed switches having contacts and windings for operating said contacts, with said windings being individually connected to said output lines of said matrix means.
Claim 8
Dependent Claim
89 words
A tunable coupling circuit in accordance with claim 4 wherein said shunt circuit is connected to said series circuit adjacent to the antenna, and including a further shunt circuit connected to said series circuit at a point between a pair of said inductors thereof, said further shunt circuit including a further plurality of capacitors and further switches having contacts individually connecting said capacitors in parallel in said further shunt circuit, and wherein said matrix means includes further output lines connected to said further switches for selectively operating the same.
References Cited (Backward Citations)
US2441570A
Cited
US2855508A
Cited
US3087125A
Cited
US3160833A
Cited
US3390337A
Cited
US3794941A
Cited
US3778731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |