MICROWAVE FILTERS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80T00246A053200110001-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 84
• Document Creation Date: December 22, 2016
• Document Release Date: October 1, 2010
• Sequence Number: 1
• Publication Date: March 24, 1960
• Content Type: REPORT

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CENTRAL INTELLIGENCE AGENCY
This material contains laformatlon a>tectin? the National Defense of the United Btatea within the messing of the Fspioaage Lava, Title
18, U.B.O. Secs. 793 sad 794, the transmission or revelation of which in any msnaer to sa unauthorirwd person is prohibited by law.
COUNTRY East Germany
DATE OF
INFO.
PLACE &
DATE ACQ.
REPORT
DATE DISTR.
NO. PAGES
REFERENCES
aTATE ]~ ARMY NAVY AIR
NsA
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~4 MAR 1960
4
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Introduction.
1. The East German Microwave Working (}coup (Arbeitsgruppe Riehtfunk
originated a pro3ect on microwave filters.
pro ec one a tis -
Technology (Institut der Fioehfrequenzteehnik) at Ilmeneu TeohtiicalUniversity
(Technische Hoehschule). Funds for the pro~eat ware taken from the institute
annual budget. The research work was carried out by Diple Ing. Loele of the
institute from approximately the beginning to the middle of -1959. 25X1
2. A report of the pra~ect was prepared and forwarded ~~rough the Microwave
Working Group to the East German Researoh Counoil (l+vrschungsrat) and the gtata
ominissio
This was-the first pro~eot
sections far filter purposes. The ressarch was undertaken in order~to try to
find a less complicated filter type which would do the came work as available
types in the microwave field; it tlais represents a natural but i~oportant ad-
vance irk filter design. this type of filter would Find Indus- 25X1
trial applioation primaril~r at the oepenick Radio Plant (Flinkwerk Koepenick},
the Rafena Plant (VEB Aafanawerk) in Radaberg, and the Radio Machaniaa Plant
(T+i~nkmechanik) in I,eipzig/Plag+ritg, but ha had no idea what form the applica-
tion would take.
~. The report treats thaorstically the deriaation of multi-aeetion filters using
both stepped inner oonductor diameters and dieleotric beads on a uniform
i conductor. The theory was reduoed to praotlee with the construction of
a band pass filter using three dielectric bead sections with matching aectiona
using the stepped inner conductor principle.
a. Figure 1 is a photograph of the diaeaaembled filter.
b. Figure 2 shows the measut-ed attenuation of the filter outside the pass
c . Figure 3 is a p1Qt of the aaloul~ted and measured atatxti~ ways ratio
ov+rthe pass band. 'The rdsults;ari piattsd 1n tars. ~! A, ~tob is the 25X1
i~soiprooal o! tpe standing gave ratio.
Intror~i4tiom
Because of the large reumbs~ of strrF fields, it is no laAger possible in tlya
decimster area to,construot filter arrangements '.from 1ye~ed eonatants. Tl~e ..
sine of t2~a eomponants,t ia: the ones of vary small ~rsv4lsiagtha, dependli tit
only on iaterna]. 4onsti"titation but also very heavi~.~ on, thi externat sperae .
Faraot calaulatione ars` possible Duly Mith Msacxall sgaatio~s and de~ini't.~ _
limiting oonditions resulting only from t11e.'entroswimt chile installed. ~)br~"'"._-~
loulations would be mush too. complioatsd to peroit tadmioal appylioation:
I~t~- regard to ted~i.ca1 aicatton, thei+elor~, the tol~,oxing pi-irti~r riquire-
rents must. be laid do~aa iY- tl~s . deoiaeter field .for oc~poaaat parts.
3-8--C-R = ~*T
Mhioh. usod' psModc ooaacial cable
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-3m
ao They must.be shielded externally. (A ohange of environment should alter,.
the electric values of the components as little ae possible.)
b. They must be independent oP one anothero (The eleotrl.oal oonneotitm of
several components should alter the electric valusa of the individual
components a$ little as poasibleo)
Thy first eonclition stresses the importan~ea of trying to assemble basic i'our
poles from s~agle pieces'of shielded conductor andconatrnat filter arrat~noetlta
which have a: different internal structure but show .external electric b~buteia-r,
similar to that of lumped constantso 81nos branches or bg-passes are dittf,o~~t
to calculate, the second condition leads t? chain circtiitao In this Dro3~Otp
the uaeth].neaa oP periodic heterogsneoua coaxial gable as a filter arrangement
is investigated and comparisons are made with filters with lumped conat~tnts,
91nos na~hrow-band filters of high quality can be constructed in a aimp].e spur
from gable circuits, special emphasis is ;placed on large band xidths and h3gb-
and low-pass oharacteristica. In the available literature, little abort snob
arrangements appearsa .This may be attributable principally to the fact that
selection and amplification are carried out in a different frequency range and,
moreover, that a large analytical expenditure Host be made in evaluating. the
equations. To a certain extent, the opposite to-this problem is a piece of
work by Heinrich R1.ede1, who investigated how and from what material die~.eeti*ia
supports can be used in coaxial gable without its transmission charaateristies
being affeatedo~
Consolidated Statement ofof Pro,~ect Results
Aa a sunaasry statement,- the most important characteristics of the two filter
arrangements Should be made in con~unotion with their application. In tbs
pfae of the arrangement v-1th dielectric discs, the calculation was simpltro
and p-atcbr~ haut transformation members wa!~ poaaibleo There is, howave~,
the di.sadvantag~ of high dielectric losses (condenser ~,r?tan S : 8 10? ),
Besic~sa t~ tlia attenuation degreases sharply in the oasa of small bid
xidtl~,
In the case of filter arrangements with abrupt diameter change of tale itu-er
eoruluotor, a further parameter is present because of the disoontiatity
capacity (Btosakapa$itaet), which influences the band Midth. The lasses 1A
su~gh an arrangereent _are very small, since almost no dielsgtric losses _oog~tro
Tlre. actual lsr~gth as greaterp however, espegially because of the transfQroaQ
tion meaaberr~ a
Primary areas of appliastto~t Brae antenna filters and filters fciir tbie. su~es-
sign of intarterence radationo In these applicationea the advantage~ot sss]:1
losses ~i.e.' high-vo tags.:-stability) is probably most hportllnto aad the
diaadvantagss Kou1d hve to be accepted? Ifs hower-er, alas is. ?t tisa~t iew
portaACS, ae~ in t2-e caa ` of ~pobila installstionsa work abed bs deme' with the
dielectric diskso`
In comparison with oavfty circuit filters of several opposingly detuned single
circuits, a simpler calculation can be made for a ~.arger band widtho !i[ore-
overo the matching possibilities are better. the infinite nwnber of pass
b4nda and attenuation bands is a disadvantagso
3-8-~G~i E-T'
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~S-E-R-E'T
FIQOI~ 3
Ca].owiated aiad Measured 8tandir~ Wave Ratio
oveP Pass Ram
S-&-C-R E-T
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