Patent US4084552A successfully refreshed from Google Patents.
US4384367A
Expired / Lapsed
US
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MDS Receiver
Assignee: Theta Com of California
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Filing: 1981-06-10
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Granted: 1983-05-17
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Expires: 2001-06-10
Abstract
Abstract An improved low-cost microwave receiver is disclosed. The receiver is intended for use in the Multipoint Distribution Services (MDS) for the reception of television signals transmitted in the 2 to 2.5 GHz region. The receiver of the present invention is of the single-conversion superheterodyne type utilizing printed circuit and microstrip transmission line construction. Printed circuit board and microstrip transmission line construction permits low-cost fabrication without machined resonant cavities or waveguide components.
Inventors
- 👤 Charles T. King
- 👤 Bernard E. Sigmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:46
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/02; H01P3/08; H01P3/081; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
195 words
A single conversion superheterodyne type microwave receiver for frequency translating signals applied from a microwave antenna comprising: input means for effecting an electrical connection to said microwave antenna; first amplification means electrically connected to said input means for amplifying the electrical signal received by said microwave antenna; a local oscillator including a step-recovery diode circuit and a first bandpass filter means, wherein said step-recovery diode circuit includes a crystal oscillator, a microstrip transmission line low-pass filter and matching structure and a step-recovery diode; mixing means for electronically mixing the output of said first amplification means with that of said local oscillator to produce a second electrical signal; second bandpass filter means electrically connected to said mixing means for passing predetermined frequencies of said second electrical signal to a second amplification means; said second amplification means being electrically connected to said second bandpass filter means and being adapted to amplify the output thereof to predetermined levels; power supply means for energizing said first and second amplification means, said mixing means, and said local oscillator; and output means for effecting an electrical connection through said power supply means between said second amplification means and a utilization device.
Claim 2
Dependent Claim
195 words
A single conversion superheterodyne type microwave receiver for frequency translating signals applied from a microwave antenna comprising: input means for effecting an electrical connection to said microwave antenna; first amplification means electrically connected to said input means for amplifying the electrical signal received by said microwave antenna; a local oscillator including a step-recovery diode circuit and a first bandpass filter means, wherein said step-recovery diode circuit includes a crystal oscillator, a microstrip transmission line low-pass filter and matching structure and a step-recovery diode; mixing means for electronically mixing the output of said first amplification means with that of said local oscillator to produce a second electrical signal; second bandpass filter means electrically connected to said mixing means for passing predetermined frequencies of said second electrical signal to a second amplification means; said second amplification means being electrically connected to said second bandpass filter means and being adapted to amplify the output thereof to predetermined levels; power supply means for energizing said first and second amplification means, said mixing means, and said local oscillator; and output means for effecting an electrical connection through said power supply means between said second amplification means and a utilization device.
Claim 3
Dependent Claim
31 words
The receiver of claim 1 wherein said first bandpass filter means consists of a plurality of electromagnetically coupled parallel, coplanar sections of microstrip transmission lines disposed in a predetermined spatial relationship.
Claim 4
Dependent Claim
236 words
A superheterodyne type microwave receiver for frequency translating signals applied from a microwave antenna comprising: input means for effecting an electrical connection to said microwave antenna; first amplification means electrically connected to said input means for amplifying the electrical signal received by said microwave antenna; a local oscillator including a step-recovery diode circuit and a first bandpass filter means, said step-recovery diode circuit having a crystal oscillator, a microstrip transmission line low-pass filter and matching structure and a step-recovery diode, and said first bandpass filter means consisting essentially of a plurality of electromagnetically coupled parallel, coplanar sections of microstrip transmission lines disposed in a predetermined spatial relationship; mixing means for electronically mixing the output of said first amplification means with that of said local oscillator to produce a second electrical signal, said mixing means consisting essentially of a quadrature hybrid microstrip transmission line having a dual-diode balanced mixer configuration; second bandpass filter means electrically connected to said mixing means for passing predetermined frequencies of said second electrical signal to second amplification means; said second amplification means being electrically connected to said second bandpass filter means and being adapted to amplify the output thereof to predetermined levels; power supply means for energizing said first and second amplification means, said mixing means, and said local oscillator; and output means for effecting an electrical connection through said power supply means between said second amplification means and a utilization device.
Claim 5
Dependent Claim
236 words
A superheterodyne type microwave receiver for frequency translating signals applied from a microwave antenna comprising: input means for effecting an electrical connection to said microwave antenna; first amplification means electrically connected to said input means for amplifying the electrical signal received by said microwave antenna; a local oscillator including a step-recovery diode circuit and a first bandpass filter means, said step-recovery diode circuit having a crystal oscillator, a microstrip transmission line low-pass filter and matching structure and a step-recovery diode, and said first bandpass filter means consisting essentially of a plurality of electromagnetically coupled parallel, coplanar sections of microstrip transmission lines disposed in a predetermined spatial relationship; mixing means for electronically mixing the output of said first amplification means with that of said local oscillator to produce a second electrical signal, said mixing means consisting essentially of a quadrature hybrid microstrip transmission line having a dual-diode balanced mixer configuration; second bandpass filter means electrically connected to said mixing means for passing predetermined frequencies of said second electrical signal to second amplification means; said second amplification means being electrically connected to said second bandpass filter means and being adapted to amplify the output thereof to predetermined levels; power supply means for energizing said first and second amplification means, said mixing means, and said local oscillator; and output means for effecting an electrical connection through said power supply means between said second amplification means and a utilization device.
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) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |