US2473310A - Tunable electrical circuits - Google Patents

Tunable electrical circuits Download PDF

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Publication number
US2473310A
US2473310A US483004A US48300443A US2473310A US 2473310 A US2473310 A US 2473310A US 483004 A US483004 A US 483004A US 48300443 A US48300443 A US 48300443A US 2473310 A US2473310 A US 2473310A
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US
United States
Prior art keywords
bridge
tuning
conductors
shaft
piece
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
US483004A
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English (en)
Inventor
Strutt Maximiliaan Julius Otto
Johannes Marinus Van Hofweegen
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2473310A publication Critical patent/US2473310A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/02—Lecher resonators

Definitions

  • tuning bridge which is-slidable along the-conductor system :and which :iorms a short-circuit for oscillationsziwhosegfrequency corresponds to the natural frequency ofqthe-rsystemc :The :movement of the tuning bridge pisxpreferably .efiected 1 in this case 1 bymeansxof azthreaded shaft.
  • the tuning member preferably..comprises a shaft .which exhibits. two :threaded partsboth of which are mechanically coupled .withi the vtuning bridges respectively and have screwethneads whose pitches have the same direction but dif- "When the invention is carried into e'fiect the 'lengthof that part of therconductor systemwhich determines thematural ;frequency or. the circuit,
  • I and 2 denote conductorsvwhichvare arranged side by :side and parallel to;:one anotheruandwhich, .jointlywith bridge :pieces 3 "and 4; form :an oscillatory circuit.
  • the brid pieces '3 and 4 areslidable with respect to rthe conductors l and land vmaybe displaced-with 'theaid of .-a tuning shaft .5 :provided'with an operating knob 5.
  • the tuning shaft comprises two threaded parts IT and 98 of substantially equal length which, when the .knobt is being turned, move .thebridgeupieces 3-and L4 respectivelywith respect to the conductors;
  • the latter i-s -pre'ferably made of insulating material.
  • the oscillatory circuit according to Fig. 2 comprises two concentric conductors H and i2 whilst at the two ends are provided bridge-pieces l3 and M.
  • the bridge-piece 113 which galvanically connects the conductors to one another at one end, is rigidly connected to the conductors and preferably has a circular shape so that the space between the conductors is closed.
  • the bridgepiece It is mounted so as to be slidable with respect to the conductors and exhibits a circular hole through which passes the inner conductor I2 whilst the outer circumference preferably also has a circular shape.
  • resilient contact strips which are provided on the inner and outer circumference respectively.
  • the outer conductor H which, in the form of construction according to Fig. 2 acts at the same time as a screening envelope, is provided with two slots I6, I! which are provided diametrically opposite one another and which extend in the axial direction of the conductors.
  • Two projections of the tuning bridge Hi project through the said slots to the outside.
  • the slots serve to guide the bridge-piece and prevents the latter from rctating.
  • To the projections of the bridge I4 are secured the ends of two rods :18 and i9, preferably of insulating material, which are symmetrically arranged with respect to the oscillatory circuit and which are secured at the other ends to a transverse connecting piece 20 which is provided with a threaded hole.
  • This screw thread corresponds to that part of a tuning shaft 22 which has a screw thread 2!, said shaft being provided with an operating knob 23 with the aid of which the bridge-piece M may be displaced with respect to the conductors l l l2. Owing to the symmetrical construction of the tuning mechanism any torsion of the bridge 14 in the outer conductor when the latter is being displaced is avoided.
  • the bridgepiece By turning the tuning shaft 22 the bridgepiece It is moved relatively to the said shaft. However, by turning the shaft 22, the latter is also displaced in its longitudinal direction relatively to the oscillatory circuit H, 112 with the aid of a second part of the shaft, which part is provided with a screw thread 2% and is journalled in a part of the hollow inner conductor 12 which is provided with a screw thread 25.
  • the displacement of the tuning bridge l4 relatively to the conductors H and I2 is determined, as in Fig. 1, by the disparity in relative displacement of the parts 54 and 22 and the parts 22 and I2 respectively, owing to which exact tuning of the oscillatory circuit is ensured.
  • the length of the conductor system corresponds to one-half wavelength of oscillations with a natural frequency of the circuit, which in itself is advantageous with very slight wavelengths since in this case the length of the oscillatory circuit conductors does not become too small.
  • the length of each of the oscillatory circuit conductors preferably corresponds to'a quarter wavelength.
  • one of the bridgepieces should consist in this case of insulating material and exclusively forms of construction fundamentally similar to that of Fig. 2 may, of course be utilized.
  • a tunable oscillatory circuit comprising an inner and an outer conductor fixedly connected together at one end by an end plate so as to constitute a concentric line resonator, a metallic bridge piece connecting the outer surface of the inner conductor with the inner surface of the outer conductor for tuning said oscillatory circuit, a shaft having two spaced screw threads of different pitches, said shaft entering the interior of said inner conductor, one of said screw threads engaging said inner conductor for causing movement of said concentric line resonator as an integral unit, the other of said screw threads on said shaft being linked to said bridge piece, whereby rotation of said shaft causes both said resonator and said bridge piece to move simultaneously in the same direction but at different rates.
  • a tunable oscillatory circuit comprising an inner conductor with an interiorly threaded end, an outer conductor with opposed slots concentric with said inner conductor, means fixedly coupling said conductors respectively at each end to produce a resonator, movable bridge means with projections mating said slots for connecting and guiding the outer surface of the inner conductor with the outer conductor for tuning said oscillatory circuit, a centrally located transversely threaded connecting piece, rod means coupling said movable bridge means with said connecting piece, a shaft with spaced groups of threads of different pitches threaded into said connecting piece and said inner conductor whereby rotational movement of said shaft causes relative motion between said resonator and said bridge means.
  • a tunable oscillatory circuit comprising an inner and an outer conductor fixedly connected together at one end by an end plate and at the other end by a first bridge piece so as to constitute a concentric line resonator, a second metallic bridge piece connecting the outer surface of the inner conductor with the inner surface of the outer conductor for tuning said oscillatory circuit, a shaft having two spaced screw threads of difierent pitches, said shaft entering the interior of said inner conductor, one of said screw threads engaging said inner conductor for causing movement of said concentric line resonator as an integral unit, the other of said screw threads r on said shaft being linked to said second bridge -piece,-whereby rotation of said shaft causes both said resonator and said.

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US483004A 1941-05-23 1943-04-14 Tunable electrical circuits Expired - Lifetime US2473310A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL229754X 1941-05-23

Publications (1)

Publication Number Publication Date
US2473310A true US2473310A (en) 1949-06-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
US483004A Expired - Lifetime US2473310A (en) 1941-05-23 1943-04-14 Tunable electrical circuits

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US (1) US2473310A (de)
BE (1) BE445680A (de)
CH (1) CH229754A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716222A (en) * 1951-07-17 1955-08-23 Louis D Smullin Temperature compensated cavity resonator
US2808570A (en) * 1953-12-08 1957-10-01 Electro Voice Ultra high frequency tuner
US4494093A (en) * 1982-11-01 1985-01-15 Gte Communications Systems Corporation Lockable tuning mechanism with reduced backlash
US20150207195A1 (en) * 2014-01-22 2015-07-23 Hon Hai Precision Industry Co., Ltd. Cavity filter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB244009A (en) * 1925-07-03 1925-12-10 Benjamin Hesketh Improvements in or relating to variable electric condensers and the like
US2019809A (en) * 1934-04-28 1935-11-05 Rca Corp Transmission line circuit
US2117090A (en) * 1937-02-19 1938-05-10 Rca Corp Adjustable ultra high frequency oscillator
US2231152A (en) * 1938-06-14 1941-02-11 Telefunken Gmbh Arrangement for resistance transformation
US2397787A (en) * 1940-12-31 1946-04-02 Rca Corp Ultra high frequency coupling device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB244009A (en) * 1925-07-03 1925-12-10 Benjamin Hesketh Improvements in or relating to variable electric condensers and the like
US2019809A (en) * 1934-04-28 1935-11-05 Rca Corp Transmission line circuit
US2117090A (en) * 1937-02-19 1938-05-10 Rca Corp Adjustable ultra high frequency oscillator
US2231152A (en) * 1938-06-14 1941-02-11 Telefunken Gmbh Arrangement for resistance transformation
US2397787A (en) * 1940-12-31 1946-04-02 Rca Corp Ultra high frequency coupling device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716222A (en) * 1951-07-17 1955-08-23 Louis D Smullin Temperature compensated cavity resonator
US2808570A (en) * 1953-12-08 1957-10-01 Electro Voice Ultra high frequency tuner
US4494093A (en) * 1982-11-01 1985-01-15 Gte Communications Systems Corporation Lockable tuning mechanism with reduced backlash
US20150207195A1 (en) * 2014-01-22 2015-07-23 Hon Hai Precision Industry Co., Ltd. Cavity filter

Also Published As

Publication number Publication date
BE445680A (de)
CH229754A (de) 1943-11-15

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