US2594031A - Connecting device for wave guides - Google Patents

Connecting device for wave guides Download PDF

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Publication number
US2594031A
US2594031A US81897A US8189749A US2594031A US 2594031 A US2594031 A US 2594031A US 81897 A US81897 A US 81897A US 8189749 A US8189749 A US 8189749A US 2594031 A US2594031 A US 2594031A
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United States
Prior art keywords
wave
guide
plane
angle
bend
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Expired - Lifetime
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US81897A
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English (en)
Inventor
Jouguet Marc
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.)
Compagnie Industrielle des Telephones SA
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Compagnie Industrielle des Telephones SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/02—Bends; Corners; Twists

Definitions

  • FIG. 3d I FIG. 3b FIG.3C FIG. 3d
  • waves of ultra-high frequency of the so-called (Ho) or (IE) type capable of being propagated in a circular-section wave guide, have remarkable properties which render them of great advantage in practical use, on the one hand they are little affected by the slight accidental distortions of the straight sections of the guide, and on the other hand the currents which they produce in the wall of the guide are purely transversal, so that they only undergo a slight attenuation, which is the less the higher the frequency.
  • the object of the present invention is a device for connection between two guides of circular cross section, the axes of which have different directions without restriction which make it possible to cause a wave of type (Ho) to pass, Without any perceptible loss of energy, from the first'guide to the second.
  • Ho wave of type
  • Fig. 1 shows a section of a curved wave guide
  • Fig. 2 shows the orientation in space of the planes containing the several sections of guides whose assembly constitutes the connection device according to the present invention
  • Figs. 3a, 3b, 3c, 3d show illustrative examples of how to determine the structural elements of the device according to the present invention.
  • Fig. 4 shows two sections which are straight and parallel but not colinear, connected by an s-shaped bent section.
  • Fig. 5 is a perspective view of a structural embodiment of the improved wave guide of circular cross section of the present invention, showing the several successive guide pieces assembled and the bends therein.
  • the waves (Ho, 11) and (E1, 11) have the same phase speed.
  • the electrical field is normal to this plane, and the magnetic field is radial, i. e. directed along the intersection line of the principal plane and the right-section plane.
  • the waves (Ho, 11) and (E1, 11) are replaced by three waves which, for a given frequency, have slightly difierent phase speeds. These three waves are:
  • Fig. 1 represents a cross section through the plane Q of the bent guide.
  • a wave of type. (E1, 11) having its principal plane merged with the plane Q, that is when applied to the input end of the guide, a wave of type (E"1, 11). is, generally speaking, transformed into a mixture of wave of type (HO n) and of wave of type (E"1, 11). If the angle 0 is an exact integral multiple ofe the wave E"1,11 alone is found again at the output of the bend.
  • the angle [3 between themes of the two guides is defined in the usual manner that cos fi'equals the sum of the paired direction cosines of the two axes.
  • a wave of type (Ho, 11) is propagated.
  • a bend C1 composed of a guide with circular cross-section of which the axis is curved along an arc Mzlvls tangential-at Mz to MiMz and is situated in a plane Q1 which contains M1M2.
  • a second'bendCz similar to the preceding oneis connected to the bend C1.
  • Its axis is curved along an arc M3M1 having: the same tangent at Ma as the arc M2Ma. Thisarc M3M4 is contained in a.
  • the bends C1, C2, Ca,' may, according to. the present invention, be separated by portions of linear guides.
  • the arcs Mzlvla, MaMi, and M4M5 may be arcs of a circle or arcs of any plane curves.
  • 010203 will designate respectively the values which the angles defined'above (Fig; 1) assumes for the bends C1, C2 and C3.
  • the angle formed by the direction of the axis MsMe of the guide G2 with the direction of the axis M1M2 of the guide G1 has been designated by [3, which guides G1 and G2 are the two terminal sections of guides to be joined; 'The'value of this angle 5 is determined by the configuration of the system in which the guides are to be mounted, such as the location-of street-intersections and other obstacles, and can not be chosen arbitrarily.
  • the value of B must'be determined before the angle 02 can befdetermined. dis the angle enclosed'between the parallels to M1M2 and M5Ms (Fig. 2) to which corresponds the angle mzoms of Fig- 3. v i
  • angles 01 and a are, according to the invention, odd multiples of the angle.
  • the angle 02 may have any value, which, as will be seen further on, can always be chosen so that the angle has a given value.
  • the wave of type (Ho, n) which is propagated in guide G1 is transformed by the bend Ci into a wave of type (E1, 11) assuming the plane Q1 to be the principal plane and the plane Q2 to be the anti-principal plane.
  • This wave of type (E1, 11) goes around the bend C2 without any great change, because it is, for this bend, a wave of type (E'i, n).
  • a wave of type (E'i, n) For the bend C3, on the other hand, it is a wave of type (E"1, n), and this bend transforms it entirely into wave of type (Ho, n) which is then propagated in the guide G2.
  • the passage of the wave of type (Ho, n) from the guide G1 to the guide G2 has been effected.
  • the indicatrix of the tangents is the curve which the point m describes when any point M describes the linear curve Ml-MB (Fig. 2). It is possible to choose as the positive direction of the passing between M1 and Ms that from M1 to M6. Let M be any point between M1 and Me. Through a point of the space (Fig.
  • a straight line Om is drawn parallel to the tangent at M to the line MiMa; let m be the point where this straight line intersects the sphere of center 0 and of radius equal to unity.
  • M passes from M1 to Me, m describes on the spherical surface the indicatrix of the tangents.
  • the fixed point me corresponds to the straight line MIMZ-
  • the fixed point me corresponds to the segment of a straight line MsMe.
  • the angle 5 is measured by the arc of a great circle ma on the spherical surface.
  • the indica-' trix sphere is the sphere of unit radius on which are traced the indicatrices of the tangents. At ms and mi it rotates through an angle of If it effects this rotation twice in the same direction (case of Figs. 3a and 3b) the sign in Formula 4 must be taken. In the contrary case (that of Figs. 3c and 3d the plus sign must be taken.
  • Formula 4 gives '02, provided that cos 02 be comprised between -1 and +1. There is always at least one solution; there can be two.
  • 02:62.7 degrees and 02:51.5 degrees the device,.at any point whatsoever, an S-shaped.
  • a device for connecting two rectilinear wave guides of circular cross section said guides being such that the axis of the first guide makes an angle 5 with a line which is parallel to the axis of the second guide and which crosses the axis of the first guide, said device being so constructed that a wave of the H0 or TEo type which is being propagated in a first one of said guides passes without sensible loss of energy into the second said guide, said two wave guides being prolonged by a first length of curved guide and a second length of curved guide forming arcs the central where Mn is the nthnon zeroroot of the Bessel J1 7 function according to'the Jahnke' and Emde tables, and Xis the wave length in free space, and R- ls the" radius ofthe cross section of'the guides,
  • said"dvice being characterized'by the fact that it'- compri'se's between said first and second lengths of curved-guide, an intermediate third length of curved "guide forming an'archaving a central angle 02 such that g s sin 0 sin 0;
  • a device for connecting two rectilinear Wave guides of circular cross-section which are adapted to convey ultra h'igh fr'equency electromagnetic wave energy.
  • said wave guides being such that the axis of the'first guide makes an angle (3 with a line WhiCh'iS parallel .to the axis of thesecond guide and which crosses the axis of the first guide, comprising a first curved guide and a j and 03, said angles being multiples of, respective1y,-'angle's 01 and 03 which angles are add multiples of where Mn is thenth non-'zerovalue of the-Bessel function J1 and A is the wave length in freespace' of the transmitted wave, and R' is theradiusof the cross section 'of said guides, said device further comprising interposed between said first and second curved guides, an intermediate third curved: forming an arc the'central angle 02013 which is such that I t cos 6 sin 0 sin 6;

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  • Surgical Instruments (AREA)
  • Waveguides (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
US81897A 1948-04-08 1949-03-17 Connecting device for wave guides Expired - Lifetime US2594031A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR836207X 1948-04-08

Publications (1)

Publication Number Publication Date
US2594031A true US2594031A (en) 1952-04-22

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US81897A Expired - Lifetime US2594031A (en) 1948-04-08 1949-03-17 Connecting device for wave guides

Country Status (7)

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US (1) US2594031A (es)
BE (1) BE486935A (es)
CH (1) CH277841A (es)
DE (1) DE836207C (es)
FR (1) FR1007862A (es)
GB (1) GB657450A (es)
NL (2) NL140627B (es)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB590351A (en) * 1944-01-25 1947-07-15 Western Electric Co Improvements in wave guides

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB590351A (en) * 1944-01-25 1947-07-15 Western Electric Co Improvements in wave guides

Also Published As

Publication number Publication date
DE836207C (de) 1952-04-10
GB657450A (en) 1951-09-19
CH277841A (fr) 1951-09-15
NL70006C (es)
FR1007862A (fr) 1952-05-12
NL140627B (nl)
BE486935A (es)

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