US4817201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single side band harmonic frequency converter, in particular for high-frequency receiving and transmitting systems
Assignee: Siemens Telecomunicazioni SpA
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Filing: 1986-11-06
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Granted: 1989-03-28
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Expires: 2006-11-06
Abstract
Abstract Two harmonic mixers arranged in parallel are connected to a first signal frequency gate and to a second local frequency gate by means of a single radiofrequency hybrid circuit in quadrature or by means of respective hybrid circuits of which one in quadrature and centered on the signal frequency and the other in phase, quadrature or opposition of phase and centered on the local frequency. Another intermediate frequency hybrid circuit in quadrature connects the two mixers to a third intermediate frequency gate and to a fourth gate closable on a termination. In this manner there is obtained a harmonic frequency conversion with image suppression.
Inventors
- 👤 Paolo Bonato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:25
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/60; H03D; H03D7/00; H03D7/16; H03D7/165; H03D7/18
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
181 words
A single side band harmonic frequency converter, comprising: two harmonic mixers arranged in parallel, each mixer including a pair of Schottky diodes connected in parallel and with opposite polarity, and an impedance matching system; a single radiofrequency hybrid circuit with phase quadrature outputs connecting each harmonic mixer with a first signal frequency gate and with a second local frequency gate wherein said radiofrequency hybrid circuit includes inputs for receiving a signal frequency input signal from the first gate, and a local frequency input signal from the second gate; and an intermediate frequency hybrid circuit with phase quadrature outputs connecting each harmonic mixer with a third intermediate frequency gate and a fourth gate; wherein: said impedance matching system includes a common node coupled to said radiofrequency hybrid circuit, a first open-circuit line section having a first terminal coupled to said common node, a second line section coupled between said Schottky diodes and said common node, a third line section coupled between said common node and said third intermediate frequency gate, and a capacitance coupled between said third intermediate frequency gate and ground.
Claim 2
Dependent Claim
181 words
A single side band harmonic frequency converter, comprising: two harmonic mixers arranged in parallel, each mixer including a pair of Schottky diodes connected in parallel and with opposite polarity, and an impedance matching system; a single radiofrequency hybrid circuit with phase quadrature outputs connecting each harmonic mixer with a first signal frequency gate and with a second local frequency gate wherein said radiofrequency hybrid circuit includes inputs for receiving a signal frequency input signal from the first gate, and a local frequency input signal from the second gate; and an intermediate frequency hybrid circuit with phase quadrature outputs connecting each harmonic mixer with a third intermediate frequency gate and a fourth gate; wherein: said impedance matching system includes a common node coupled to said radiofrequency hybrid circuit, a first open-circuit line section having a first terminal coupled to said common node, a second line section coupled between said Schottky diodes and said common node, a third line section coupled between said common node and said third intermediate frequency gate, and a capacitance coupled between said third intermediate frequency gate and ground.
Claim 3
Dependent Claim
34 words
The converter in accordance with claim 1 wherein said radiofrequency hybrid circuit comprises an interdigited Lange coupler with dimensions such as to present an optimal balance at the signal frequency and the local frequency.
Claim 4
Dependent Claim
70 words
The converter in accordance with claim 1 further comprising: a first band-pass filter coupled between said radiofrequency hybrid circuit and said first signal frequency gate for passing the signal frequency input signal and blocking the local frequency input signal; and a second band-pass filter coupled between said radiofrequency hybrid circuit and said second local frequency gate for passing the local frequency input signal and blocking the signal frequency input signal.
Claim 5
Dependent Claim
42 words
The converter in accordance with claim 3 wherein said first band-pass filter comprises a low-pass filter and a resistive line between said radiofrequency hybrid circuit and ground, and a high-pass filter between said radiofrequency hybrid circuit and said first signal frequency gate.
Claim 6
Dependent Claim
14 words
The converter in accordance with claim 4 wherein said low-pass filter comprises a line-section.
Claim 7
Dependent Claim
14 words
The converter in accordance with claim 4 wherein said high-pass filter comprises two line-sections.
Claim 8
Dependent Claim
42 words
The converter in accordance with claim 3 wherein said second band-pass filter comprises a high-pass filter and a resistive line between said radiofrequency hybrid circuit and ground, and a low-pass filter between said radiofrequency hybrid circuit and said second local frequency gate.
Claim 9
Dependent Claim
17 words
The converter in accordance with claim 7 wherein said high-pass filter is made up of a line-section.
Claim 10
Dependent Claim
17 words
The converter in accordance with claim 7 wherein said low-pass filter is made up of two line-sections.
Claim 11
Dependent Claim
173 words
A single side band harmonic frequency converter, comprising: two harmonic mixers arranged in parallel, each mixer including a pair of Schottky diodes connected in parallel and with opposite polarity, and an impedance matching system; a single radiofrequency hybrid circuit with phase quadrature outputs connecting each harmonic mixer with a first signal frequency gate and with a second local frequency gate, wherein said radiofrequency hybrid circuit includes inputs for receiving a signal frequency input signal from the first gate, and said local frequency input signal from the second gate; and an intermediate frequency hybrid circuit with phase quadrature outputs connecting each harmonic mixer with a third intermediate frequency gate and a fourth gate; a first band-pass filter coupled between said radiofrequency hybrid circuit and said first signal frequency gate for passing the signal frequency input signal and blocking the local frequency input signal; and a second band-pass filter coupled between said radiofrequency hybrid circuit and said second local frequency gate for passing the local frequency input signal and blocking the signal frequency input signal.
Claim 12
Dependent Claim
173 words
A single side band harmonic frequency converter, comprising: two harmonic mixers arranged in parallel, each mixer including a pair of Schottky diodes connected in parallel and with opposite polarity, and an impedance matching system; a single radiofrequency hybrid circuit with phase quadrature outputs connecting each harmonic mixer with a first signal frequency gate and with a second local frequency gate, wherein said radiofrequency hybrid circuit includes inputs for receiving a signal frequency input signal from the first gate, and said local frequency input signal from the second gate; and an intermediate frequency hybrid circuit with phase quadrature outputs connecting each harmonic mixer with a third intermediate frequency gate and a fourth gate; a first band-pass filter coupled between said radiofrequency hybrid circuit and said first signal frequency gate for passing the signal frequency input signal and blocking the local frequency input signal; and a second band-pass filter coupled between said radiofrequency hybrid circuit and said second local frequency gate for passing the local frequency input signal and blocking the signal frequency input signal.
Claim 13
Dependent Claim
76 words
The converter in accordance with claim 10 wherein said impedance matching system comprises: a common node coupled to said radiofrequency hybrid circuit; a first open-circuit line section having a first terminal coupled to said common node; a second line section coupled between said Schottky diodes and said common node; a third line section coupled between said common node and said third intermediate frequency gate; and a capacitance coupled between said third intermediate frequency gate and ground.
Claim 14
Dependent Claim
34 words
The converter in accordance with claim 10 wherein said radiofrequency hybrid circuit comprises in interdigited Lange coupler with dimensions such as to present an optimal balance at the signal frequency and the local frequency.
Claim 15
Dependent Claim
42 words
The converter in accordance with claim 10 wherein said first band-pass filter comprises a low-pass filter and a resistive line between said radiofrequency hybrid circuit and ground, and a high-pass filter between said radiofrequency hybrid circuit and said first signal frequency gate.
Claim 16
Dependent Claim
14 words
The converter in accordance with claim 13 wherein said low-pass filter comprises a line-section.
Claim 17
Dependent Claim
14 words
The converter in accordance with claim 13 wherein said high-pass filter comprises two line-sections.
Claim 18
Dependent Claim
42 words
The converter in accordance with claim 10 wherein said second band-pass filter comprises a high-pass filter and a resistive line between said radiofrequency hybrid circuit and ground, and a low-pass filter between said radiofrequency hybrid circuit and said second local frequency gate.
Claim 19
Dependent Claim
17 words
The converter in accordance with claim 16 wherein said high-pass filter is made up of a line-section.
Claim 20
Dependent Claim
17 words
The converter in accordance with claim 16 wherein said low-pass filter is made up of two line-sections.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |