US3757222A - D shorting diodes controlling a transmission line electrical length single sideband generator employing a plurality of cyclically switche - Google Patents

D shorting diodes controlling a transmission line electrical length single sideband generator employing a plurality of cyclically switche Download PDF

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Publication number
US3757222A
US3757222A US00216982A US3757222DA US3757222A US 3757222 A US3757222 A US 3757222A US 00216982 A US00216982 A US 00216982A US 3757222D A US3757222D A US 3757222DA US 3757222 A US3757222 A US 3757222A
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United States
Prior art keywords
transmission line
carrier
radio frequency
line
circulator
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Expired - Lifetime
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US00216982A
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English (en)
Inventor
F Oberbury
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International Standard Electric Corp
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International Standard Electric Corp
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Publication date
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    • 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
    • H03C7/025—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas using semiconductor devices
    • H03C7/027—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas using semiconductor devices using diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B21/00—Generation of oscillations by combining unmodulated signals of different frequencies
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D9/00—Demodulation or transference of modulation of modulated electromagnetic waves
    • H03D9/06—Transference of modulation using distributed inductance and capacitance
    • H03D9/0608—Transference of modulation using distributed inductance and capacitance by means of diodes

Definitions

  • ABSTRACT [22] Filed: 1971 A digital single sideband generator in which the carrier [21 1 A No. 216,982 frequency is fed via a circulator to a (microstrip) transmission line which has a series of switchable short circuits (RF grounded diodes) along a length of the line [2%] 3291:8535/2; equal to half the carrier wavelength successivecyclic 49 switching of the diodes simulates a moving RF energy I 1 2: 3;; 44 2 1 reflector advancing or retarding the phase of the rel flected energy according to direction of switching and resulting in a frequency offset at the circulator output [56] References Cited determined by the cyclic rate.
  • a single sideband generating device including a radio frequency transmission line having an electical length from one end thereof at least equal to half the carrier wavelength means for simulating cyclic unidirectional movement along said transmission line over a length thereof equal to said half wavelength of a radio frequency energy reflector in a direction and at a rate determining respectively the sense and the magnitude of frequency offset of the sideband frequency from the carrier frequency, and circulator means for coupling a source of carrier frequency when connected to the circulator input to said one end of the transmission line and for coupling the reflected energy from said one end of the transmission line to the circulator output.
  • a radio frequency microstrip transmission line 1 is coupled at one end to an intermediate port of a circulator 2 having an input port 3 for connection to a carrier frequency source and an output port 4 for connection to a load.
  • n diodes 5 Connected to the transmission line I along an electrical length d equal to half the wavelength of the carrier frequency are n diodes 5 with an electrical length spacing of 11/11 between adjacent diodes.
  • Each diode is connected to ground for radio frequency energy, via a suitable capacitance, shown as a capacitor 6, on application to the diode of a positive switching pulse via each pulse input (typically 7).
  • pulse distributor 8 for applying the switching pulse cyclically in turn to each of the diodes 5 to enable the short circuit resulting from the respective diode being RF grounded.
  • the energy propagating along the transmission line is reflected at the instantaneous position of the short circuit to return along the length thereof, after having travelled a distance determined by the position of the short circuit and is thereafter routed from the circulator end of the line to the output 4 of the circulator, which prevents the reflected energy returning to the source.
  • Successive switching of the position of the short circuit on the line causes a corresponding advance or retard of the phase of the signal at the load, in digital steps, determined by the direction of the switching sequence, the shift in this Signal frequency from that of the carrier being determined by the rate of simulated movement of the radio frequency energy reflecting short circuit.
  • switching After a complete cycle of phase has been introduced (after a half wavelength due to the double path to he travelled), switching reverts to the start for the next cycle in the repetitive series.
  • the above described sideband generator is very suitable for frequencies between 50 MHZ and 3,000 MHZ. Only an upper or a lower sideband is fundamentally generated, and there is'no basic loss other than that in the circulator.
  • a single sideband generating device for a radio frequency system comprising:
  • a radio frequency transmission line having an electrical length at least equal to one half wavelength at the carrier frequency
  • a radio frequency circulator having input, output and intermediate ports, said intermediate port being connected to a first end of said transmission line and said input and output ports providing carrier input and output, respectively;
  • shorting devices include diodes responsive to said cyclical control, said means for cyclically controlling comprising an electrical pulse distributor to produce said electrical sequencing.
  • Apparatus according to claim 4 including a matched load connected to the second end of said transmission line for terminating said line.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Transceivers (AREA)
  • Transmitters (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
US00216982A 1971-01-08 1971-01-11 D shorting diodes controlling a transmission line electrical length single sideband generator employing a plurality of cyclically switche Expired - Lifetime US3757222A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0014/71A GB1279361A (en) 1971-01-08 1971-01-08 Frequency changing device
US21698271A 1971-01-11 1971-01-11

Publications (1)

Publication Number Publication Date
US3757222A true US3757222A (en) 1973-09-04

Family

ID=26236359

Family Applications (1)

Application Number Title Priority Date Filing Date
US00216982A Expired - Lifetime US3757222A (en) 1971-01-08 1971-01-11 D shorting diodes controlling a transmission line electrical length single sideband generator employing a plurality of cyclically switche

Country Status (4)

Country Link
US (1) US3757222A (enExample)
DE (1) DE2200458A1 (enExample)
FR (1) FR2121674B1 (enExample)
GB (1) GB1279361A (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5376888A (en) * 1993-06-09 1994-12-27 Hook; William R. Timing markers in time domain reflectometry systems
US5450044A (en) * 1993-04-14 1995-09-12 Acrodyne Industries, Inc. Quadrature amplitude modulator including a digital amplitude modulator as a component thereof
US5469127A (en) * 1992-08-04 1995-11-21 Acrodyne Industries, Inc. Amplification apparatus and method including modulator component

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4954791A (en) * 1989-09-29 1990-09-04 Hewlett-Packard Company Non-commensurate line length rf modulator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290624A (en) * 1964-02-10 1966-12-06 Microwave Ass Phase shifter in iterative circuits using semiconductors
GB1119879A (en) * 1966-08-18 1968-07-17 Ass Elect Ind Improvements relating to modulators
US3423699A (en) * 1967-04-10 1969-01-21 Microwave Ass Digital electric wave phase shifters
GB1187760A (en) * 1969-03-13 1970-04-15 Standard Telephones Cables Ltd Phase-Shifting Arrangement
US3573660A (en) * 1969-04-24 1971-04-06 Robert V Garver Broadband, reflection-type single sideband modulators

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5469127A (en) * 1992-08-04 1995-11-21 Acrodyne Industries, Inc. Amplification apparatus and method including modulator component
US5450044A (en) * 1993-04-14 1995-09-12 Acrodyne Industries, Inc. Quadrature amplitude modulator including a digital amplitude modulator as a component thereof
US5376888A (en) * 1993-06-09 1994-12-27 Hook; William R. Timing markers in time domain reflectometry systems
US5726578A (en) * 1993-06-09 1998-03-10 Precision Moisture Instruments, Inc. Apparatus and methods for time domain reflectometry
US6104200A (en) * 1993-06-09 2000-08-15 Precision Moisture Instruments, Inc. Apparatus and methods for generating unambiguous large amplitude timing makers in time domain reflectometry systems for measuring propagation velocities of RF pulses to determine material liquid contents moisture

Also Published As

Publication number Publication date
GB1279361A (en) 1972-06-28
FR2121674B1 (enExample) 1976-09-03
DE2200458A1 (de) 1972-07-20
FR2121674A1 (enExample) 1972-08-25

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