PHYSICS - WAVE GUIDES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600230246-4
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 5
• Document Creation Date: December 22, 2016
• Document Release Date: July 18, 2011
• Sequence Number: 246
• Publication Date: June 3, 1949
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/07/18 :CIA-RDP80-00809A000600230246-4
CLASSIft^YIC~i ~ , Mi~,7tA~. ~
G~NTRAC INCEL.tIGENCE AGENCY i2EPOR
iNFORMP71t?N! FROM
F'+oael~~a ?ocuaae?[~tvs :~R ~tAelo,Blzoan~ CD N~,
Pbyeioe - ;lave guides
1~athly psrlodinal
Iaeningra?t
PUBlISNEQ ' Agr1 1948
LANGUAGE Rasing
~+4TE C/lSP, 33wau,1949.
P~0, ~F PAS 5
SUPPt,E6NE1~'[ 1'(9
REPORT' ND.
T}IIS IS UNEVALUATED INEQRMATI?N
StJURCE u ne. Ta iesleos Fixiki, Pol ~IIZ, Ao 4, 1448.. (F~ Pot Abe
Eo T 9 -_:,Iniorm~tioti regnested:)
ATTAgIATIOH OB' THE HLO ilAPE IH A R>~TAllW7.AR HAVB'^~JIDS
H. 1;. fdnloP
lloaoov State Pedagog Iret
imeni O. I. Ien1r,.
Submitted 31 October 1947
jS`tnsbere Sr. brsckete refer to the bibliography. Figuxee a and b nre appended
This article gives onloalatioo~ for the abteoaation of aD H1ipp rn~e iD a
reotaogulnr rareguide, obtniaed by obeerring the repeated reileotions of n trsne-
?erss rave iroc the yells of the rareguide. Zt chow that raves of type Heo and
Hnn onnrot be considered as s partioalnr arse of a rare of type Hm rith olt~d with an :DSOlator acd rhiah Les l~pall~ aonduoting ralle (Figure a), n
~vsPe of the IIlp type, baring n iregneaoy a;~ 1 and oharnoterised by reotangalar
ooepoDeDta kith the follorigZ amplitwdee ~1~
EY ~ k ~ s;~ ~.~ x~, Ex E ~, . Hy. D;
Hx=~? ~ sin+ a ~C,~ ~{~--~a) cas ~a~. 7L~, fly
_t~
there ilo~2e (siazlsun rare length *or a ?reu rare guide).
Aooordiag to Brilla:in ~2J, this rata oaD be aoosidered ae n result of
acltiple retleotions frost the sells of the raseguida (z=O, z=~ of the purely
ttsosrsree raze, testing these aalle at an eagle of
~~41'r. aes/~
50X1-HUM
DA7F.' ~F
1PEFOR~TIO~I. 1947
Sanitized Copy Approved for Release 2011/07/18 :CIA-RDP80-00809A000600230246-4
 Sanitized Copy Approved for Release 2011/07/18 :CIA-RDP80-00809A000600230246-4
The rectanaul;ar canponeate of this wave in the aavaguide hnva thr+ follow-
a~B~ taa9e:
f~x~ ~ ~ , ~~*Ci { ~~ s
!, (3)
and the direotion of propagation, before sad after raflaotian from the ~Lle,
ie oharaoteriz?d'.by tihe folloerng equations
rl~z sin ~ - x cos ~, r~z en'g? z cos ~J.
It ie~ eaeilq seen that mei~aetio pompon?nte are generated sad give a
;erultlrag traosPeree ot~ponent vrith an'aoiplitade:
H~~'l~z sir ~-r /~~ os~ ga ?~ E"J (4,)
bat ?tfll finite. f&e lettial'ab?orptan (of m rave;):,`in doniieotiod with Chis,
id usually eharacterized by tho ooeffioient of att?naation '
_ ~~ ~, (52
there P represents the average losses cf power in the walls per unit of nziel
length of the xaveguide, and W represents the average rate of energy flow in
the raveguide, ooe~nted tiithont considering attenuation.
P is ueunlliy determined by approzisatione (~1] and [3J) vhioh eometises
require oumbersode ealoulatione. 1Qot without interest ie the method of deteralning
P through representation of the repeatedly reflected raves.
It follows from Mgure b, that the nuaber of refleotione ezperienced by a
pnreij tzansveree pave fr~- both tulle of width b while ewving one oeatieu+ter? elo~ Q
the aiie of the ravegnile equals
The ooetfieieat of reflection of the amplitude for n rave with the eleatriosl
vaator Ferpesdicnlar to tho plsoe rf tho indidence equals ([ h~, p 7a)
Ro,_ ,~'~ r~ , c,)
Mhers~~ le the angle of refraotinn~ determined by the ezpreseion
Ssrs n represents the prig*ipnl indez of refraction and k the ooeffioient of
absorption of the reflecting surface. They are determined Dy the Yell-known
egnntioaa of ara1Y (~ 7, D 7~)?
Since Sn the Dees of metals, is the preeenoo of mieroraves the diaplnoement
anrrent is negligible, i.e., in oomparieon with the aoodaoting onr:sat, the
follortng approzlmnte ezpreneioos sre aoournte anoagh for our. pntpneee~
n x kr~.j/ ~ yJ 1
~~~~~~~1
Sanitized Copy Approved for Release 2011/07/18 :CIA-RDP80-00809A000600230246-4
 Sanitized Copy Approved for Release 2011/07/18 :CIA-RDP80-00809A000600230246-4
~1
vhera Yl !s expressed ip'electroaa~r_at,ia a~zite. Introducing for ffihs sake of
abbaeviation the valua tt '3_n. , a,- ,,btr.ln after simple computations:
ozpreeelon,, sacurate ug.to the te~?m n ~:
Therefore' the average Losses in the. wa11e of width bare determined ee.
folloae?
+shero~e reprbeente n eery small ma~nituiie.
at point b reith ocordaatte a'(Figure b,) the phase differenoe betweec the. t-
e~ea~?n~ate.of t~xe interfering,traneeere? va~om equnlm
$~ a ' ~ X ape
and tharetore the eganre of the amplitude o. the reau ting z-oo~onente equals
1'h++ z??eua{q~aent is eisilarly derived:
The square of the amplitude of the rennlting field at the euzfaoe of the
call is deterained obrLoueiy by the ezpreaelon:
~./ a 2 + ~.,/ 1
,rl -r~xl //~~
Srai? vnlne raa be used fur ooinputing the losses eocording to the method of
enrfaos effect([-i], p 104). Ie~t ae oi;tain the average losses in the strip
(a z 1) off:
o a
P mZ~ ? sir ~Y ~ H? dx= ~,~z ~ /f (lu)
The valae of the average rate of energy flow entering tha wavognida io
ffetsrainsd by.ths following ezprseaion:
ill/ ~ ~ ~E~)s ~ ? C0= c ,r~ ~ ,vln
ro 8fi Y 4 a ~a (11)
Taking intp ooneideratioa (5 ), (9) and (10), we"deteraine the eoefrioient
of attea!tation of ware H10 Sa the wavegnide ae follows:
~~? ~ -~~~ ~~ n~ s;e yryr (12)
Introducing the quantitiae y=~'~ (there f represents the limiting
1"rsaaaaoy for n given wnve~i#ei) sad ~ (peeiffo rasieta~oe ezpreeaed ip praetioal
unite) ire tbtnin
ti
X0.119 ~ 16 y'+!
-3-
colnrl~rlnl.
Sanitized Copy Approved for Release 2011/07/18 :CIA-RDP80-00809A000600230246-4
 Sanitized Copy Approved for Release 2011/07/18 :CIA-RDP80-00809A000600230246-4
-a-me ~D a sin 9p < Y.
1Eotnnlly, floe Yign;e k