US2612559A - System of transmission by wave guides - Google Patents

Description

Patented Sept. 30, n 1952 `Marc Gif 'Jougue'tgsfrsay France; ssign'or -to, i: Gompagnieglndustrielle dest'Ilelerihomis,y Raus Frances a @mutation 0,1' France, i.

. 20, 1947, serial N 780,885

Marcin-1,1194?? ,-v`

This invention relates to the transmission of j r`.ppllcan high frequency electricalwaves by wave-guides, appliedftofsthd entranceofla,curvediportiontof;a, and'it has for its object to provide a novel and i circularf.crnsssectionigguide; itiisx. titansformed,i

improvedfvtransmission: system-for this purpose'. whollyeorlinfpartljntoi 'IMx-ewave;whichLshows-- Various other'objects Yand.'advantages Wil g i with vinitial wavefllEoji-axphase difierenceaofrig; apparent@ as theynaturefof, the invention is more the amplitude of Wave `'IlVli is therefore zero at ful'lyudisclosed.v 1 the guide points wherathe amplitude of the It is knownthat when, awaveof the type wave TED is maximum, and inversely'. designated (Hd) or(TEoYis-'propagated in a rec- We must therefore have tilinear/ guide Lof-v circular' crossrsection; itl-V .is 101 f i, transmitted without changingitsfnature4 overith'ev n. f: j entire lengtll of this guide. But if the latter pre'- im@ )fR I sents a curved'part, the wave'vv isv generally transthat is i formedgffwholly or in. part;into a wavefthe l typedenominatediEi) or (TD/,Lilli v l; 1'5 f, v Je 1 mi: im, i @In order that waveTEU.mayfberrecoveredlagan 'z'mtlW/gAwmgmt?? 310. (18526, at the exit of the bend, with its initial amplitude, e l' i the bend must terminateatalpoint such hat i l j object'to I.. missione ,n.lieat aesfeund theta# Peint asse euere @Evt betr wobintswhtvt counted? along the guide axis, beginning vwith by'r'neans of one"or-"sve'ral4 lengths"-^of curved' vthe commencement of ythevbend, the amplitude guides separated eventually by rectilinear porof the TEowave is proportional to tions. The pointsto be connected may be, in par- ?r d ticular, the ends'of rectilinear guides. cos ma] e 25 My novel system is characterized by the fact #1N/ 2- that every curved portion which it has is designed in such a manner as to cause the axisv of the guide to turn on the path in which it is inserted at an angle equal to the amplitudel of the wave TM1 being consev quently proportional to 1r d sin 2] '-50 1l/5 VR l nxslox in which expression: l t R'designates the bend curvature radius, degrees, n being any integer Whatever, x being the d the diameter of the right section of the guide, 35 length 0f a Wave Which COI'IeSDOIldS in a free I A the Wave length n free space of wave TEc, vand Space 00 the frequency transmitted by the guide. ,u the nrst non-zero motor equation J1=o of and d being the `diameter of the guide expressed Bessel, the value of which is 3.8317. with the same unit as the wave length. In Orde t reco e th TM ith zer m When the bend is intended to connect two recl 1.1; d rdoth g r ewave TEI W. o a 40 tilinear lengths making a given angle 6 between p 1 u e an. ere Ore the Wave lbwlth lts mam' them, the Wave length A is selected, or the dirrilirlrflpglige at the exit of the end, we must ameter d so that the equation* ,r d 4 A 0=n X310 X- t n/'2- ARZ n 45 d n being any integer. y is satisfied. K-

Now, if the bend opening angle is designated This arrangement may be applied to the transby 0, the abscissa z of the point of egress of the mission of energy by means of a wave (TEo), bebend is equal to R0. tween two points at a distance from each other It is therefore not possible, inv general, to A and B which it is impossible, because of any transmit completely a wave (TEO) from aportion sort of obstacles, to connect by a single rectiof guide of circular cross-section into another linear guide. For this purpose, the two points portion of the same diameter, whenl the axes of A and B are connected by rectilinear guide these two portions form any kind of an angle r lengths arranged according to a broken line path between them. surrounding the obstacle, two successive lengths l y 3 being coupled by an elbow such as to form Vbetween them a whole multiple angle of In 'thei-acatimini?"ing drawingyrigs. 1 and 2 illustrate, respectively, by way of example, a

coupling device according to the present inven-,

tion, and its application to a distance connection.

Fig. 1 shows a Ycoupling device between two lengths l and lV of circular Vcross-section rec-A degrees, A and d a wave length A in free space," two portions` of f rectilinear wave-guides, and one kneed portion of guide arranged betweensaid rectilinear portions. the knee of said kneed portion of guide forming an angle multiple of ahollow-pipe type wave-guide having a l`:':ircular cross4secti'on of diameter d and adapted tilinear guides of diameter d," this deviceconsist- .f ing of a single elbow 2 Such-that the axes of the' two rectilinear lengths make an angle 0 betweenl them Vdetermined as indicated above.4

Fig. VV2 is a diagram of a connectionfbetw/een-v two points A and B between which there is an obstacle M.' This connection is secured by.V meansof four rectilinear lengths or portions, AC, DE, FGf'and HB, connected together, by.;mea.ns ,of`

elbows, CD, EE'VGH, asfdescribedlin connection with `Fig.` 1,vv and-arrangedaccording: to .akline suchV Vthat-fthe successive lengths f form .between K L it, f

angles "61,: 02, 63,al1 full multiples of f A 310X'`i'r7` degrees'. Y1 l If thediameter of the guides and a wave length are given, and if -we .have,;for example Ail it is possible `toA give tp eachof the Values 31, 62, 93 and 124.

The invention claimed is: u 1.v In ajhollow-ruper type'waveiguideY having a circular cross-,section 'of 'diameter vd and adapted to propagate TE@l electromagnetic Waves having the angles one of lirs "to :propagate TEU Velectromagnetic waves having Qafwavel-length A in free space, two portions of "rectilinear wave-guides. and a plurality of kneed :portions ofuguide: arranged between said rectilinear portions, the angles of the knees of said kneed portions beingsuch that Ithe longitudinal f axis"ofsaid two rectilinear portions form between them an angle'multiple of 1 231%* degrees,

un??? 1 l `v`mimaniac'las CITED The following lreferences .are of record 1inl the. lelofrthiswpatent; I. V yUnirEND,l"sfrrrri3sv PATENTS, Number 'Name 2,410,838 Ring'r' NOV. v12, 1946 2,493,842 'ryrvren gran'.D 10,11950 l.FREIG'N- PATENTS ff Number' Y Country` Datel beingV yexpressed with anysame A and being l expressed 4with any vsaine Date V- IGreat Britain 1. l 1 Novi 5,1946 v

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