Patent US4574201A successfully refreshed from Google Patents.
US4574201A
Expired / Lapsed
US
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Radio frequency switching circuit device
Assignee: Alps Alpine Co Ltd
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Filing: 1982-09-24
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Granted: 1986-03-04
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Expires: 2002-09-24
Abstract
Abstract A radio frequency switching circuit device wherein an LC circuit is inserted between two terminals, while a diode is shunted, and wherein the diode is controlled into its nonconductive state and its conductive state by a D.C. voltage, whereby the path between the two terminals is switched into a conductive state and a nonconductive state with respect to a radio frequency signal; characterized in that a transistor which turns "on" upon the application of the D.C. voltage is inserted in series with a D.C. voltage terminal for applying the D.C. voltage to the diode.
Inventors
- 👤 Toru Ohyama
- 👤 Takao Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:31
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/74; H03K17/56; H03K17/567
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
179 words
A device for switching between two radio frequency signals, comprising: means including first and second terminals for receiving respective radio frequency input signals; means including a D.C. voltage terminal for receiving a D.C. voltage; switching means controlled by the D.C. voltage to be in conductive or non-conductive states; means including a transistor connected in series with said D.C. voltage terminal for applying said D.C. voltage to said switching means; and a resonance circuit including a capacitor connected to said switching means and to said transistor for receiving input signals from said first and second terminals and for trapping one of the radio frequency signals by the operation of said switching means; said resonance circuit having an effective capacitance the discharging path of which includes said transistor, such that when the switching means is in a non-conductive state and the transistor is in a substantially off state, the time constant of the discharging path is sufficiently long relative to the frequencies of said radio frequency signals to keep the capacitance charged to maintain said switching means in the non-conductive state.
Claim 2
Independent Claim
179 words
A device for switching between two radio frequency signals, comprising: means including first and second terminals for receiving respective radio frequency input signals; means including a D.C. voltage terminal for receiving a D.C. voltage; switching means controlled by the D.C. voltage to be in conductive or non-conductive states; means including a transistor connected in series with said D.C. voltage terminal for applying said D.C. voltage to said switching means; and a resonance circuit including a capacitor connected to said switching means and to said transistor for receiving input signals from said first and second terminals and for trapping one of the radio frequency signals by the operation of said switching means; said resonance circuit having an effective capacitance the discharging path of which includes said transistor, such that when the switching means is in a non-conductive state and the transistor is in a substantially off state, the time constant of the discharging path is sufficiently long relative to the frequencies of said radio frequency signals to keep the capacitance charged to maintain said switching means in the non-conductive state.
Claim 3
Dependent Claim
16 words
A radio frequency switching device according to claim 1, wherein said transistor is a PNP transistor.
Claim 4
Dependent Claim
23 words
A radio frequency switching device according to claim 1, wherein said transistor is controlled by the D.C. voltage from said D.C. voltage terminal.
Claim 5
Dependent Claim
16 words
A radio frequency switching device according to claim 1, wherein said switching means is a diode.
Claim 6
Dependent Claim
17 words
A radio frequency switching device according to claim 2, wherein said transistor is of the grounded-base type.
Claim 7
Dependent Claim
22 words
A radio frequency switching device according to claim 1, wherein a capacitor is interposed between said D.C. voltage terminal and said transistor.
Claim 8
Dependent Claim
21 words
A radio frequency switching device according to claim 1, wherein said resonance circuit is constructed of an inductance and a capacitor.
Claim 9
Dependent Claim
31 words
A radio frequency device according to claim 1, including an output terminal, and said switching means serving to switch either one of the radio frequency input signals to said output terminal.
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) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |