US2817760A - Ultra high frequency harmonic generators or the like - Google Patents

Ultra high frequency harmonic generators or the like Download PDF

Info

Publication number
US2817760A
US2817760A US457835A US45783554A US2817760A US 2817760 A US2817760 A US 2817760A US 457835 A US457835 A US 457835A US 45783554 A US45783554 A US 45783554A US 2817760 A US2817760 A US 2817760A
Authority
US
United States
Prior art keywords
high frequency
ultra high
cavity
resonator
terminal
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 - Lifetime
Application number
US457835A
Inventor
Willard H Dobbertin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoffman Electronics Corp
Original Assignee
Hoffman Electronics Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hoffman Electronics Corp filed Critical Hoffman Electronics Corp
Priority to US457835A priority Critical patent/US2817760A/en
Application granted granted Critical
Publication of US2817760A publication Critical patent/US2817760A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03BGENERATION 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
    • H03B5/00Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/18Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance
    • H03B5/1817Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator
    • H03B5/1835Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator the active element in the amplifier being a vacuum tube

Definitions

  • This invention is related to ultra high frequency harmonic generators, and more particularly. to an improved ultra high frequency harmonic generator which is relatively inexpensive to manufacture, and which also exhibits optimum performance at all operating frequencies.
  • a signal distorting crystal diode input is coupled to a resonant cavity construction capable of being tuned to select particular harmonic in the distorted input wave form of an input signal when this signal is translated through the aforementioned crystal diode.
  • the resonant cavity construction consists of a cavity and a center resonant line which may be capacitively loaded by means of a probe which is capacitively coupled to an adjustable end portion of the aforementioned cavity.
  • One or more inductive probes within the cavity couple the selected harmonic signal to an associated output terminal.
  • harmonic generator is shown to consist of cap assembly 11 and cavity resonator assembly 12.
  • Cap 13 of cap assembly 11 is internally threaded.
  • Adjusting screw 14 is threaded into a tapped hole in cap 13.
  • Locking nut 15 is provided to lock adjusting screw 14 in a chosen vertical position.
  • Cylindrical cavity 16 has externally threaded end portion 17 and output attachment flanges 18. Cylindrical cavity 16 is closed at the lower end by base element 19.
  • Base element 19 may, of course, be manufactured integrally with cylindrical cavity 16.
  • Resonator 20 consists of resonant line portion 21 and capacitive probe portion 22. Resonator 20 is affixed to base element 19 in conventional manner.
  • Resonant line portion 21 of resonator 20 has provided on its periphery a receptacle portion 23 to receive one terminal of crystal diode 24.
  • access hole in the wall of cylindrical cavity 16 is provided to accommodate the placement of crystal diode 24.
  • the remaining terminal of crystal diode 24 is to be connected to external signal generating circuitry (not shown).
  • Atlixed by screws or other 2,817,760 Patented Dec. 24, 1957 means to output attachment flanges 18 of cylindrical cavity 16 are two output terminal receptacle assemblies 26.
  • Receptacle assemblies 26 each consist of mounting fiange 27, cylindrical L-section element 28, insulator 29, probe 30, and output terminal 31.
  • Inductance probes 30 are each grounded at one end and are of appropriate length and spacing from resonant line portion 21.
  • Input receptacle 32 is shown disattached from its respective mounting flange, for sake of clarity.
  • the harmonic generator apparatus shown in the sole figure operates as follows.
  • a high frequency signal source (not shown) is coupled through crystal diode 24 to harmonic generator 10.
  • Crystal diode 24 will pass either the positive half-cycles or the negative half-cycles of the input signal, depending upon which end-terminal of crystal diode 24 is disposed within receptacle 23.
  • the properties of crystal diodes are such as to distort the wave form of the signal passing through them.
  • a distorted input signal will be fed to resonant line portion 21 of resonator 20, of the harmonic generator.
  • the positioning of receptacle 23 upon resonant line portion 21 will be dictated by a maximum energy transfer for a given cavity load.
  • the overall height of cylindrical cavity 16 would have to be approximately 7.5 centimeters, i. e., one-fourth wave length at a frequency of 1,000 megacycles, for example.
  • the length thereof at 1,000 megacycles must be 7.5 centimeters.
  • the present invention allows the quarter wave resonant line section to be shortened physically by end-loading capacitively. This capacitive loading is accomplished by varying the capacitance between capacitive probe portion 22 of resonator 20 and the top portion of cap assembly 11. It is to be noted that the downward progression of cap 11 uniformly reduces the height of the cavity without distorting the cavity and incurring mode skipping which might otherwise occur by such distortion.
  • the subject configuration may be thought of either as a re-entrant cavity resonator or as a coaxial transmission line short-circuited at one end and in quarter-wave resonance.
  • the apparatus will progressively exhibit resonant cavity characteristics. It will be true that as the distance between capacitive probe portion 22 and cap 13 of cap assembly 11 is increased, the capacitance loading will decrease and the consequent resonant frequency will increase, and, simultaneously, the effective electrical length of the cavity will increase, thereby reducing the resonant frequency and tending to cancel the decrease in capacitance loading.
  • the subject invention provides a way for tuning the cavity resonator to a particular harmonic of the fundamental frequency of the signal source, and selecting the same for transmission to output terminals 31.
  • the design of inductance probes 30 and terminal receptacles 26 may be such as to match the impedance of a conventional 50 ohm coupling line.
  • this invention provides a relatively simple and inexpensive apparatus for generating and selecting harmonies of any particular fundamental frequency and feeding such selective harmonic to any and all of the output terminals employed.
  • An ultra high frequency harmonic generator including, in combination, a signal input terminal; a crystal diode having first and second end terminals, said first end terminal of said crystal diode being connected to said input terminal; a resonator element having a resonant line portion and a capacitive probe portion, said resonant line portion of said resonator element having a terminal receptacle adapted to receive said second end terminal of said crystal diode; a cylindrical cavity enclosing said resonator element and having means for receiving and securing output coaxial connectors, a threaded end portion, and a base portion to which said resonator element is aflixed; a threaded cap element in capacitive relationship with said probe portion and adapted to cooperate with said threaded end portion of said cylindrical cavity; and at least one coaxial output connector mounted upon said securing means of said cylindrical cavity and having inductive probes grounded at one end and disposed within said cylindrical cavity adjacent said resonator element.
  • An ultra high frequency harmonic generator including, in combination, a signal input terminal; a crystal diode having first and second end terminals, said first end terminal of said crystal diode being connected to said input terminal; a resonator element having a resonant line portion and a capacitive probe portion, said resonant line portion of said resonator element having a terminal receptacle adapted to receive said second end terminal of said crystal diode; a cylindrical cavity enclosing said resonator element and having means for receiving and securing output coaxial connectors, a threaded end portion, and a base portion to which said resonator element is affixed; a threaded cap element in capacitive relationship with said probe portion and adapted to cooperate with said threaded end portion of said cylindrical cavity, said cap element being provided with a positioning screw and locking nut which are positioned and adapted for cooperation with the end of said cylindrical cavity; and at least one coaxial output connector mounted upon said securing means of said cylindrical cavity and having in

Landscapes

  • Control Of Motors That Do Not Use Commutators (AREA)

Description

Dec. 24, 1957 W. H. DOBBERTIN ULTRA HIGH FREQUENCY HARMONIC GENERATORS OR THE LIKE Filed Sept. 23, 1954 WILLARD DOBBERTIN INVENTORQ QWQM HIS ATTORNEY United States Patent ice ULTRA HIGH FREQUENCY HARMONIC GENERATORS OR THE LIKE Willard H. Dobbertin, Los Angeles, Calif., assignor to Hoffman Electronics Corporation Application September 23, 1954, Serial No. 457,835
3 Claims. (Cl. 250-36) This invention is related to ultra high frequency harmonic generators, and more particularly. to an improved ultra high frequency harmonic generator which is relatively inexpensive to manufacture, and which also exhibits optimum performance at all operating frequencies.
In the past, many designs have been proffered regarding ultra high frequency harmonic generators. Invariably, such harmonic generators utilize klystrons or other ultra high frequency vacuum tubes, and also employ rather involved circuitry.
Therefore, it is an object of, this invention to provide an improved ultra high frequency harmonic generator which will be relatively inexpensive to manufacture.
It is a further object of this invention to provide an ultra high frequency harmonic generator which will lend itself to reliability, minimum radiation, and optimum perform ance over the entire frequency range in use.
According to this invention, a signal distorting crystal diode input is coupled to a resonant cavity construction capable of being tuned to select particular harmonic in the distorted input wave form of an input signal when this signal is translated through the aforementioned crystal diode. The resonant cavity construction consists of a cavity and a center resonant line which may be capacitively loaded by means of a probe which is capacitively coupled to an adjustable end portion of the aforementioned cavity. One or more inductive probes within the cavity couple the selected harmonic signal to an associated output terminal.
The features of the present invention which are believed to be novel are set forth with particularity in the appended claims. The present invention, both as to its organization and manner of operation, together with further objects and advantages thereof, may best be understood by reference to the following description, taken in connection with the accompanying drawing, in which the sole figure is an elevational perspective view of an ultra high frequency harmonic generator, according to the present invention.
In the sole figure, harmonic generator is shown to consist of cap assembly 11 and cavity resonator assembly 12. Cap 13 of cap assembly 11 is internally threaded. Adjusting screw 14 is threaded into a tapped hole in cap 13. Locking nut 15 is provided to lock adjusting screw 14 in a chosen vertical position. Cylindrical cavity 16 has externally threaded end portion 17 and output attachment flanges 18. Cylindrical cavity 16 is closed at the lower end by base element 19. Base element 19 may, of course, be manufactured integrally with cylindrical cavity 16. Resonator 20 consists of resonant line portion 21 and capacitive probe portion 22. Resonator 20 is affixed to base element 19 in conventional manner. Resonant line portion 21 of resonator 20 has provided on its periphery a receptacle portion 23 to receive one terminal of crystal diode 24. In addition, access hole in the wall of cylindrical cavity 16 is provided to accommodate the placement of crystal diode 24. The remaining terminal of crystal diode 24 is to be connected to external signal generating circuitry (not shown). Atlixed by screws or other 2,817,760 Patented Dec. 24, 1957 means to output attachment flanges 18 of cylindrical cavity 16 are two output terminal receptacle assemblies 26. Receptacle assemblies 26 each consist of mounting fiange 27, cylindrical L-section element 28, insulator 29, probe 30, and output terminal 31. Inductance probes 30 are each grounded at one end and are of appropriate length and spacing from resonant line portion 21. Of course, any number of output terminals may be employed using substantially the same configuration shown in the sole figure. Input receptacle 32 is shown disattached from its respective mounting flange, for sake of clarity.
The harmonic generator apparatus shown in the sole figure operates as follows. A high frequency signal source (not shown) is coupled through crystal diode 24 to harmonic generator 10. Crystal diode 24 will pass either the positive half-cycles or the negative half-cycles of the input signal, depending upon which end-terminal of crystal diode 24 is disposed within receptacle 23. The properties of crystal diodes are such as to distort the wave form of the signal passing through them. Hence, a distorted input signal will be fed to resonant line portion 21 of resonator 20, of the harmonic generator. The positioning of receptacle 23 upon resonant line portion 21 will be dictated by a maximum energy transfer for a given cavity load. If it is considered, for the moment, that cap assembly 11 and capacitive probe portion 22 of resonator 20 are eliminated from the harmonic generator configuration, then the overall height of cylindrical cavity 16 would have to be approximately 7.5 centimeters, i. e., one-fourth wave length at a frequency of 1,000 megacycles, for example. Or, considering resonant line portion 21 to be a quarter wave length resonant line, the length thereof at 1,000 megacycles must be 7.5 centimeters. The present invention allows the quarter wave resonant line section to be shortened physically by end-loading capacitively. This capacitive loading is accomplished by varying the capacitance between capacitive probe portion 22 of resonator 20 and the top portion of cap assembly 11. It is to be noted that the downward progression of cap 11 uniformly reduces the height of the cavity without distorting the cavity and incurring mode skipping which might otherwise occur by such distortion.
As is well known in the art, the subject configuration may be thought of either as a re-entrant cavity resonator or as a coaxial transmission line short-circuited at one end and in quarter-wave resonance. As the length of resonant line portion 21 is decreased, the apparatus will progressively exhibit resonant cavity characteristics. It will be true that as the distance between capacitive probe portion 22 and cap 13 of cap assembly 11 is increased, the capacitance loading will decrease and the consequent resonant frequency will increase, and, simultaneously, the effective electrical length of the cavity will increase, thereby reducing the resonant frequency and tending to cancel the decrease in capacitance loading. However, the latter effect will be very small in comparison to the effect of changing capacitance, owing to the relative proximity of capacitive probe portion 22 with respect to cap assembly 11. Therefore, the subject invention provides a way for tuning the cavity resonator to a particular harmonic of the fundamental frequency of the signal source, and selecting the same for transmission to output terminals 31. The design of inductance probes 30 and terminal receptacles 26 may be such as to match the impedance of a conventional 50 ohm coupling line.
It is seen that this invention provides a relatively simple and inexpensive apparatus for generating and selecting harmonies of any particular fundamental frequency and feeding such selective harmonic to any and all of the output terminals employed.
While particular embodiments of the present invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from this invention in its broader aspects, and, therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of this invention.
I claim:
1. An ultra high frequency harmonic generator including, in combination, a signal input terminal; a crystal diode having first and second end terminals, said first end terminal of said crystal diode being connected to said input terminal; a resonator element having a resonant line portion and a capacitive probe portion, said resonant line portion of said resonator element having a terminal receptacle adapted to receive said second end terminal of said crystal diode; a cylindrical cavity enclosing said resonator element and having means for receiving and securing output coaxial connectors, a threaded end portion, and a base portion to which said resonator element is aflixed; a threaded cap element in capacitive relationship with said probe portion and adapted to cooperate with said threaded end portion of said cylindrical cavity; and at least one coaxial output connector mounted upon said securing means of said cylindrical cavity and having inductive probes grounded at one end and disposed within said cylindrical cavity adjacent said resonator element.
2. Apparatus according to claim 1 in which the disposition of said terminal receptacle of said resonator element is uniquely positioned upon said resonant line portion to provide a maximum transfer of energy.
3. An ultra high frequency harmonic generator including, in combination, a signal input terminal; a crystal diode having first and second end terminals, said first end terminal of said crystal diode being connected to said input terminal; a resonator element having a resonant line portion and a capacitive probe portion, said resonant line portion of said resonator element having a terminal receptacle adapted to receive said second end terminal of said crystal diode; a cylindrical cavity enclosing said resonator element and having means for receiving and securing output coaxial connectors, a threaded end portion, and a base portion to which said resonator element is affixed; a threaded cap element in capacitive relationship with said probe portion and adapted to cooperate with said threaded end portion of said cylindrical cavity, said cap element being provided with a positioning screw and locking nut which are positioned and adapted for cooperation with the end of said cylindrical cavity; and at least one coaxial output connector mounted upon said securing means of said cylindrical cavity and having inductive probes grounded at one end and disposed within said cylindrical cavity adjacent said resonator element.
References Cited in the file of this patent UNITED STATES PATENTS 2,177,272 Zottu Oct. 24, 1939 2,408,420 Ginzton Oct. 1, 1946 2,566,759 Clark et a1 Sept. 4, 1951 2,600,278 Smullin June 10, 1952 2,605,399 Pound July 29, 1952 2,616,037 Wheeler et al Oct. 28, 1952 OTHER REFERENCES Article: Harmonic Generation Diodes, pages 68 of General Radio Experimenter; vol. 26, No. 2 for July 1951.
US457835A 1954-09-23 1954-09-23 Ultra high frequency harmonic generators or the like Expired - Lifetime US2817760A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US457835A US2817760A (en) 1954-09-23 1954-09-23 Ultra high frequency harmonic generators or the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US457835A US2817760A (en) 1954-09-23 1954-09-23 Ultra high frequency harmonic generators or the like

Publications (1)

Publication Number Publication Date
US2817760A true US2817760A (en) 1957-12-24

Family

ID=23818246

Family Applications (1)

Application Number Title Priority Date Filing Date
US457835A Expired - Lifetime US2817760A (en) 1954-09-23 1954-09-23 Ultra high frequency harmonic generators or the like

Country Status (1)

Country Link
US (1) US2817760A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2982922A (en) * 1957-07-02 1961-05-02 Gen Electric Co Ltd Frequency multiplying apparatus
US3029393A (en) * 1956-10-12 1962-04-10 Sperry Rand Corp Detector assembly holder and coupling device in a coaxial line resonator
US3041524A (en) * 1958-02-13 1962-06-26 Karayianis Nick Frequency-doubling microwave cavity
US3076132A (en) * 1958-06-27 1963-01-29 Hughes Aircraft Co Harmonic generator
US3090018A (en) * 1959-10-06 1963-05-14 Varian Associates Reference cavity resonator
US3196339A (en) * 1960-06-23 1965-07-20 Microwave Ass Microwave harmonic generator and filter element therefor
US3223918A (en) * 1960-11-25 1965-12-14 Gen Electronic Lab Inc Frequency multiplier
US3239744A (en) * 1965-04-16 1966-03-08 Gen Electronic Lab Inc Frequency multiplier
US3268795A (en) * 1962-11-14 1966-08-23 Hughes Aircraft Co Microwave frequency doubler

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2177272A (en) * 1936-04-22 1939-10-24 Rca Corp Short wave electron discharge system
US2408420A (en) * 1944-01-13 1946-10-01 Sperry Gyroscope Co Inc Frequency multiplier
US2566759A (en) * 1948-08-03 1951-09-04 Motorola Inc High-frequency tuner
US2600278A (en) * 1945-08-02 1952-06-10 Louis D Smullin Variable capacity cavity tuning
US2605399A (en) * 1945-09-27 1952-07-29 Robert V Pound Ultrahigh frequency mixer
US2616037A (en) * 1950-04-28 1952-10-28 Rca Corp High-frequency mixer circuit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2177272A (en) * 1936-04-22 1939-10-24 Rca Corp Short wave electron discharge system
US2408420A (en) * 1944-01-13 1946-10-01 Sperry Gyroscope Co Inc Frequency multiplier
US2600278A (en) * 1945-08-02 1952-06-10 Louis D Smullin Variable capacity cavity tuning
US2605399A (en) * 1945-09-27 1952-07-29 Robert V Pound Ultrahigh frequency mixer
US2566759A (en) * 1948-08-03 1951-09-04 Motorola Inc High-frequency tuner
US2616037A (en) * 1950-04-28 1952-10-28 Rca Corp High-frequency mixer circuit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029393A (en) * 1956-10-12 1962-04-10 Sperry Rand Corp Detector assembly holder and coupling device in a coaxial line resonator
US2982922A (en) * 1957-07-02 1961-05-02 Gen Electric Co Ltd Frequency multiplying apparatus
US3041524A (en) * 1958-02-13 1962-06-26 Karayianis Nick Frequency-doubling microwave cavity
US3076132A (en) * 1958-06-27 1963-01-29 Hughes Aircraft Co Harmonic generator
US3090018A (en) * 1959-10-06 1963-05-14 Varian Associates Reference cavity resonator
US3196339A (en) * 1960-06-23 1965-07-20 Microwave Ass Microwave harmonic generator and filter element therefor
US3223918A (en) * 1960-11-25 1965-12-14 Gen Electronic Lab Inc Frequency multiplier
US3268795A (en) * 1962-11-14 1966-08-23 Hughes Aircraft Co Microwave frequency doubler
US3239744A (en) * 1965-04-16 1966-03-08 Gen Electronic Lab Inc Frequency multiplier

Similar Documents

Publication Publication Date Title
US3899758A (en) Variable inductive resonant circuit arrangement having a diamagnetic core for the UHF range
US3931587A (en) Microwave power accumulator
US3085205A (en) Semiconductor harmonic generators
US2817760A (en) Ultra high frequency harmonic generators or the like
US2277638A (en) Ultra high frequency system
US3605034A (en) Coaxial cavity negative resistance amplifiers and oscillators
USRE20189E (en) Oscillation circuit for electric
US2617038A (en) Ultrahigh-frequency device
US2458650A (en) Coaxial line generator
US3140444A (en) Tuner
US3270292A (en) Ultra high frequency transistor oscillator
US2468151A (en) Coupling arrangement for ultra high frequency circuits
US2141242A (en) Ultra short wave system
US3747032A (en) Arrangement for providing improved linearization of the voltage-frequency characteristic of a resonant circuit having a voltage-variable capacity diode
US3423701A (en) Cavity resonators for microwaves coupled together by variable capacitance diode
US2476803A (en) High stability receiver circuit
US3226645A (en) Parametric frequency converters
US3119073A (en) Diode parametric amplifier
US2798945A (en) Ultra-high frequency tuner of constant band-width
US3223918A (en) Frequency multiplier
US2282861A (en) Oscillator
US2433386A (en) Ultra high frequency mixer circuit
US3261981A (en) Parametric amplifier frequency up-converter
GB580812A (en) Improvements in arrangements for coupling wide frequency band antennae to transmission lines
US2203085A (en) Electrical oscillator for generation of high frequencies