Claims
- 1. 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.
- 2. 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.
- 3. 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.
Parent Case Info
This is a continuation of application Ser. No. 120,815, filed Feb. 12, 1980, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
414769 |
Aug 1934 |
GBX |
Non-Patent Literature Citations (1)
Entry |
A Receiver for 144 MHz, by N. Davies, Radio Communication, vol. 52, No. 12, pp. 900-905, Dec. 1976. |
Continuations (1)
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Number |
Date |
Country |
Parent |
120815 |
Feb 1980 |
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