GB977335A - Microwave modulation circuit arrangement for producing a carrier wave and a single sideband - Google Patents
Microwave modulation circuit arrangement for producing a carrier wave and a single sidebandInfo
- Publication number
- GB977335A GB977335A GB1529161A GB1529161A GB977335A GB 977335 A GB977335 A GB 977335A GB 1529161 A GB1529161 A GB 1529161A GB 1529161 A GB1529161 A GB 1529161A GB 977335 A GB977335 A GB 977335A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- carrier
- degrees
- coupler
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C7/00—Modulating electromagnetic waves
- H03C7/02—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
- H03C1/60—Modulators in which carrier or one sideband is wholly or partially suppressed with one sideband wholly or partially suppressed
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Amplitude Modulation (AREA)
Abstract
977,335. Amplitude modulation systems. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Feb. 26, 1962 [April 27, 1961], No. 15291/61. Heading H3R. In a microwave carrier and single sideband generator, carrier is applied through a 3db. coupler 10 equally with 90 degrees phase difference to waveguides comprising modulators 11, 12 fed with identical modulation signals 90 degrees out of phase so that the upper (or lower) sidebands of the modulator outputs are in phase and the lower (or upper) sidebands in anti-phase. If the output of modulator 12 is phase shifted at 18 by + 90 degrees and the two pairs additively combined by a 3db. coupler 17 producing a 90 degrees phase lag of the input from modulator 12, then only the lower sideband is produced and applied through a 10db. coupler 5 to the output B (and the upper sidebands suppressed). Further, all unmodulated carrier output from modulators 11, 12 is by-passed by polarization sensitive side arms 13, 14 to a 3db. coupler 21 which additively combines the two 90 degrees out of phase carrier inputs and wholly directs the unmodulated carrier to output B. The carrier inputs to modulators 11, 12 may be maintained 90 degrees out of phase by a variable phase shifter 19 automatically controlled as in Specification 970,728 by detecting relative phase variations in the side arms 13, 14, sample outputs being taken by 40db. couplers 23, 24.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1529161A GB977335A (en) | 1961-04-27 | 1961-04-27 | Microwave modulation circuit arrangement for producing a carrier wave and a single sideband |
| FR895958A FR1320637A (en) | 1961-04-27 | 1962-04-27 | Microwave modulation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1529161A GB977335A (en) | 1961-04-27 | 1961-04-27 | Microwave modulation circuit arrangement for producing a carrier wave and a single sideband |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB977335A true GB977335A (en) | 1964-12-09 |
Family
ID=10056457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1529161A Expired GB977335A (en) | 1961-04-27 | 1961-04-27 | Microwave modulation circuit arrangement for producing a carrier wave and a single sideband |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB977335A (en) |
-
1961
- 1961-04-27 GB GB1529161A patent/GB977335A/en not_active Expired
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