US2591980A - Adjustable impedance transformer - Google Patents

Adjustable impedance transformer Download PDF

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Publication number
US2591980A
US2591980A US54102A US5410248A US2591980A US 2591980 A US2591980 A US 2591980A US 54102 A US54102 A US 54102A US 5410248 A US5410248 A US 5410248A US 2591980 A US2591980 A US 2591980A
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United States
Prior art keywords
conductors
conductor
waves
impedance
dielectric
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Expired - Lifetime
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US54102A
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English (en)
Inventor
Johannes Marinus Van Hofweegen
Knol Kornelis Swier
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Publication date
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/04—Coupling devices of the waveguide type with variable factor of coupling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/24—Terminating devices

Definitions

  • dielectric conductors are considered to comprise hollow tubes having a conductive wall and exhausted or filled with gas, liquid or a solid dielectric, as well as hollow tubes made of nonconductive material, so far the described conductors can be used for the transmission of ultra-high frequency electromagnetic waves.
  • the excitation means and/or the load on the conductor it is frequently not possible for the excitation means and/or the load on the conductor to be so proportioned as to ensure matching, that is to say to provide their impedance to be equal to the characteristic impedance of the conductor.
  • the consequence of the load not being matched is that stationary waves occur in the conductor, resulting in additional losses. If stationary waves are avoided by matching of the loadon the conductor, it is generally desirable that the excitation means should also be matched to the conductor, since in this case the energy transmission is a maximum.
  • a device for acting upon the matching may be regarded as a transformer which transforms a determined impedance into.
  • the known constructions have the disadvantage that the adjustability can be realised only with difficulty from the constructional view-point.
  • the area at which a dielectric auxiliary conductor is connected to the conductor to be matched can difiiformations desired.
  • the present invention provides a device which permits of carrying out any impedance trans- It is thus possible, if desired, always to obtain correct matching. Furthermore the adjustability of the device can be made simpler from a constructional point of view.
  • the device according to the invention exhibits the characteristic that two dielectric conductors located at difierent sides of a common part of the side-wall are coupled with one another through an aperture of adjustable size provided in the common wall part, the extremities of the two conductors located near the aperture being closed by adjustable conductive pistons.
  • the dielectric conductors I and 2 have a common wall part 3.
  • the conductors exhibit a rectangular sectional area.
  • an aperture 4 through which the conductors I and 2 are coupled with one another.
  • the aperture 4 is of adjustable size, for example in that one or more of the wall parts bounding the aperture are made slidable.
  • the extremities 5 and 6 of the dielectric conductors I and 2, which are located near the aperture 4, are closed by adjustable conductive pistons I and 8. Now, any desired impedance transformation may be produced between the dielectric conductors I and 2 by adjustment of the size of the aperture 4 and of the position of the pistons 1 and 8.
  • the dielectric conductor I is con.- nected to a horn-like radiator used for the transmission of electro-magnetic energy and if this horn has an impedance not equal to the characteristic impedance of the conductor 2, station'- ary waves will occur in the conductor 2 with direct connection of the horn-like radiator to this conductor as a result of the horn impedance not being matched.
  • the use of the device according to the invention enables the impedance of the horn-like radiator which differs from the characteristic impedance of the conductor 2, to be transformed into the characteristic impedance of this wave conductor. It is thus ensured that stationary waves cannot occur in the conductor 2. This transformation is effected, as already mentioned, by correct adjustment of the size of the aperture 4 and of the position of the pistons I and 8.
  • Fig. 3 shows a further form of device according to the invention.
  • 2,-which are located near the aperture M in the common wall part I3, are here provided at the same side of the aperture l4. It appears that thus any desired impedance transformation may be adjusted by means of only two movement mechanisms, of which one moves simultaneously the two pistons l1 and I8 and the other varies the size of the aperture l4 by movement of that portion of the common side-wall I3 which is located at the side of the aperture which is remote from the two pistons 11 and IS.
  • FIG. 4 A particularly simple construction is obtained if that portion of the common side-wall which is located between the two pistons is omitted.
  • the construction thus obtained is shown in Fig. 4.
  • Two pistons are here combined to form one piston 31 which closes the extremities of the conductors 39 and 3
  • the aperture 34 is adjustable to any desired size by movement of the common wall part 32 of the conductors 30 and 3
  • the cross-sectional area indicated by II-II in Fig. 4, is shown in Fig. 5. It has been found that the device shown in Fig. 4 also permits of effecting any desired impedance transformation by the adjustment of the piston 37 and of the slidable part 32 of the wall.
  • TE-waves transversal component
  • TM-waves transversal component
  • may be imagined to be decomposed into waves exhibiting in 30 and 3
  • respectively are coupled to one another by waves produced in the space intermediate the piston 31 and the dotted line 43 and indicated by the arrow 39.
  • respectively cannot occur in the last-mentioned space; they are reflected at the dotted line 43.
  • may be adjusted by displacement of the piston 31 and of the common part 32 of the wall. It has been found that adjustment of any desired impedance transformation is thus possible.
  • the device shown in Fig. 1 may also be used with a method of oscillation in which the arrows 3 8, 39, 40, 4
  • angles 44 and 45 are made oblique. It is observed that this is already known per se.
  • the device according to the invention may be adjusted in a simple manner according to tables or graphs or empirically for effecting any desired impedance transformation. Consequently, it is particularly useful in experimental arrangements with dielectric conductors for obtaining correct matching in testing excitation means and loads,
  • An arrangement for guiding ultra-high-frequency waves comprising first and second dielectric Wave guides terminating in adjacent portions provided with a common electrically conductive wall, said wall being adjustable longitudinally with respect to the termination of said portions and independently of the remaining walls of said guides to define a coupling section between said guides, and a piston slidably disposed within said section to vary the effective dimensions of said section.
  • An arrangement for guiding ultra-hjgh-frequency waves comprising first and second colinearly-disposed wave guides terminating in parallel portions positioned perpendicularly with respect to said colinear guides and provided with a longitudinally adjustable common conductive wall and an opening therebetween defining a wave guide section common to said first and second guides, and a piston slidably disposed within said section to vary the effective dimensions of said section.

Landscapes

  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Waveguide Connection Structure (AREA)
US54102A 1947-10-14 1948-10-12 Adjustable impedance transformer Expired - Lifetime US2591980A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL269675X 1947-10-14

Publications (1)

Publication Number Publication Date
US2591980A true US2591980A (en) 1952-04-08

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ID=19781868

Family Applications (1)

Application Number Title Priority Date Filing Date
US54102A Expired - Lifetime US2591980A (en) 1947-10-14 1948-10-12 Adjustable impedance transformer

Country Status (7)

Country Link
US (1) US2591980A (enrdf_load_stackoverflow)
BE (1) BE485269A (enrdf_load_stackoverflow)
CH (1) CH269675A (enrdf_load_stackoverflow)
DE (1) DE860231C (enrdf_load_stackoverflow)
FR (1) FR973449A (enrdf_load_stackoverflow)
GB (1) GB649214A (enrdf_load_stackoverflow)
NL (1) NL72262C (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813254A (en) * 1952-05-23 1957-11-12 Robert D Hatcher Broad band maching hybrid waveguide
US2816269A (en) * 1952-05-23 1957-12-10 Robert D Hatcher Waveguide power divider
US2820201A (en) * 1951-02-28 1958-01-14 Sperry Rand Corp Selective transfer device for microwave energy
US2989699A (en) * 1955-09-07 1961-06-20 Prd Electronics Inc Multi-mode standing wave indicator
US3025481A (en) * 1959-10-09 1962-03-13 Ite Circuit Breaker Ltd Transmission line directional coupler impedance matching tuner
US3025517A (en) * 1952-01-31 1962-03-13 Robert B Watson Simultaneous lobe comparison for radar direction finding
US3034076A (en) * 1953-06-08 1962-05-08 Sperry Rand Corp Microwave diplexer
DE1275169B (de) * 1962-08-30 1968-08-14 Siemens Ag Anordnung zur Ankopplung wenigstens eines Resonanzkreises fuer sehr kurze elektromagnetische Wellen an wenigstens einen Anschlusshohlleiter
US4120256A (en) * 1977-09-06 1978-10-17 Semler Joel H Apparatus for sealing flange joints

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1230872B (de) * 1954-06-30 1966-12-22 Siemens Ag Aus dielektrischem Stoff bestehende Wellenfuehrungsanordnung
US3084296A (en) * 1961-10-23 1963-04-02 Hughes Aircraft Co 180 deg. h-plane bend for rectangular waveguide

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2153728A (en) * 1936-10-07 1939-04-11 American Telephone & Telegraph Ultra high frequency signaling
US2283935A (en) * 1938-04-29 1942-05-26 Bell Telephone Labor Inc Transmission, radiation, and reception of electromagnetic waves

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2153728A (en) * 1936-10-07 1939-04-11 American Telephone & Telegraph Ultra high frequency signaling
US2283935A (en) * 1938-04-29 1942-05-26 Bell Telephone Labor Inc Transmission, radiation, and reception of electromagnetic waves

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2820201A (en) * 1951-02-28 1958-01-14 Sperry Rand Corp Selective transfer device for microwave energy
US3025517A (en) * 1952-01-31 1962-03-13 Robert B Watson Simultaneous lobe comparison for radar direction finding
US2813254A (en) * 1952-05-23 1957-11-12 Robert D Hatcher Broad band maching hybrid waveguide
US2816269A (en) * 1952-05-23 1957-12-10 Robert D Hatcher Waveguide power divider
US3034076A (en) * 1953-06-08 1962-05-08 Sperry Rand Corp Microwave diplexer
US2989699A (en) * 1955-09-07 1961-06-20 Prd Electronics Inc Multi-mode standing wave indicator
US3025481A (en) * 1959-10-09 1962-03-13 Ite Circuit Breaker Ltd Transmission line directional coupler impedance matching tuner
DE1275169B (de) * 1962-08-30 1968-08-14 Siemens Ag Anordnung zur Ankopplung wenigstens eines Resonanzkreises fuer sehr kurze elektromagnetische Wellen an wenigstens einen Anschlusshohlleiter
US4120256A (en) * 1977-09-06 1978-10-17 Semler Joel H Apparatus for sealing flange joints

Also Published As

Publication number Publication date
BE485269A (enrdf_load_stackoverflow)
FR973449A (fr) 1951-02-09
NL72262C (enrdf_load_stackoverflow)
CH269675A (de) 1950-07-15
DE860231C (de) 1952-12-18
GB649214A (en) 1951-01-24

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