BSTJ 40: 1. January 1961: Band-Splitting Filter. (Marcatili, E.A.; Bisbee, D.L.)

8.7 MB·English

Band-Splitting Filter

By A, MARCATIEE and D. 1. BISBEE
(Mowe nse Sly 1 3805

A comslancesstanoe fe cupeble of dicing a vy wide Land its
tes subd ke everiod- Hoth one eta a Oe wilt pon
With only bh iors tae So enc subband. The ekaing netion
tea piace ine cern narow hans (460 me). Two of te eamponene are
Sinpurtert dons: an eDaow i @ shen! jovelie. Boh ere qualia?
lal sr ith Te ce in ® neh dancer wooed.

‘The longest saveide communicational Rael
estrome'y imal Iie excenting perhngm from 40 to 8 ke

ae nt eticanen heh mutate nt hae
found 400 me amr, Pooising lors capable «@ perorming “hie
Channel seporasion have Been deseod lsewhers, but ie im
aos thee stisctory tec eae reine i approsinealy 100
‘hanael-dropping diem ace to be stake cn ster another. The main
reasone ‘or possible ule aw

“au Heooranes of awaited mes, This eerurs because sorte of te
flcere srw reyuiral Us petate over a nie of TRequencics covering, mors
‘thon one ulin

ih) Alultple refestins. Although the rolection from each Alter bs
sil, the combine! weston of as muy w= 100 my become pre
Iie lage at sees Feuer.

Troublee Iron Hse enueee eum Ie eeu by dividing de Dra
40-kme band ints several suboands, The wie: ocho subbands ene be
fuustd fo sevon dats ealtable rnb of chemnel<iupping Mrs

"his paper uiseriher alter wgable uf citing a band ion pute
Ae can euily halls one etave in the willie region with Tow inser
fon lees bynace ih opens 4 Fs tas Eg ety 2 Hoh
‘inmetor weve

"Tin epliting peocese von eepented ce many times ae neces by
nosing sain Hor
188 re eeu Sven. THeENICAL SOURSAL, EANCARE 166

cote O rea

Fig: 1 tan oping ton

Ath spituing Str hes bee il and tet The rests are qui
otis

"The Ialplittng filers 4 umstsn-rosinace Sten, ig, 4, masde
ccxeatally of to identical hybrid junetionsu ada end wo densi?
igh esa lle, Wa phase ete tween aves of the iyi am
show in he figure. Potente in pot Tie dived iy he Byrd
mint to equal pote dia vel tengh eqast ele el ph red
‘he high pase filter. Erequeneis above taat of cutoff of che ters kee
tv trveing end recombine with ho same phace ix pars 1, aw the
Uuoperite phe 2 port. Tstquensin Seon thes of cute of Uh lems
tre reo sd sl i port 2 an subtract io pore. Conereenty, all
{he poe entacing 2a pore ewer prs 2 en 4

‘What happene st freqaences where the vbr are intel st do
vl vido poner in el pure? The unitary poser sneering in pent
‘sive by the yori fet parts, Pand 1 — P,thot travel vowand
te ler. Dus to conmervation nee the phase safe the ye
‘ve sdependas cf the vale and Tae bowers appontne in port 8 al
‘Lfebove ete) are

Pel a0, ao

oar) @
Poxwor recovered in tho iret bybrl (low excall e
P=. -ara- 8)
Pyaar) w

We click innately Ua if the kyl opente idelly spitting
power in helvas, 1 = and

Rarao,

Pernt
vaso-srssvenca HERE 190

Py wl Py given in (2) and (1 mmasne the recaverable power
Fact te hyo ave vs ie. Lass prag some rues no ebese
fspreesione Lor P= O55 rf — 0600 --+, Pe Pe = BT
‘eons ee at Irequraies why th pawer division of the hrs sm

bad as two tone, the tesveable pomer of Ue Id pitsing tr is as
has eght-rints of thw pitt pear (035 ds lee). "This good be
Tavior ofthe band-spliting Ili, even with unequal porter aii
Hc isbid sesares ef iney peat overs fx mely Bro bund
‘An experimental mele! of band-splittng iter operating with
larclectyiv woe i wn fn Lg, 2s an ie schematic appar in
Wigs Lis Sorocing so are tite tte ed to elbows beer
thw geverntor ami the actual bel-spliling tlter Just for "compact
We desoribe now the experimental trie aged tu ovate the

Header, ler ant she ress,
‘Most ofthe expert data ie presated in oelogeapls Put sey
frequents in aeece amd poser nates. The insertion las af

theory, for exemple, ean be etclaind fist tw exlgras Xi
hoo te tracted powers With and wichout Une devine eluded in
the miso neni

‘The wie bande dinplaye in enc alr ae been achiewed
“ough she ue of harkovae ware ose Ie hae to pay #8
in that ie npn pve of thse fais vies rapidly i frequen,
fxd thovefons they ilographs exkibit fine sCrucure that makes
‘measurement a file cumbercane
200 am pots vam roommtest sommint, sasmany 196

Eason

“There ore eoveral source of erons in our measurements, One stamie
from the cesumption that we have a squacclaw detector; tha is nat
Seely mond ones’ ony Ihe snp of srr ordinate
ves tollale quantcative coulis Further, nmall nits yield
nly cuaitative dics, booauco it for ezaall goals thatthe deteetor
departe stzongy from the square lat. The other sourees af erate axe
the reltipleefleens of the thong msi ara the dapat reams
ff epusinus meds, Bosh exit oy beenuoe of the mesearing tecnigue,
tint consmpently uot rpreent elena propestte of the dr ines
andar teases. In foc, iit known that dscominies fn
mtimade waweguce exite practically no selections except forwand
‘couvesion, uw in ones Zor seasnrentats to bw msde she malicode
‘waveuie must he eonnovted ton generutor and resiver that operate
Insingo made nsiangtor eaves. This sho eornering traaiuoere
wher mest The rellet ins of Uke thevigh made (ke lage ad ln
‘shote the vonvertd tnades are eat of ed reooted,

“Multi reeetione und damped ress show thei presence ia
ssocnnarnse est 201

tive osillegmaphe se vey fine porieic weillations superimposed on che
leaciy jagee! hasrand wave ceili lt fee, For example, Fe

Th In trausissinn, were ie dhe eueort.mading, © tho top of thi
fing etrusure tse foktom, oF eeagple in beeen? One hand,
ilmitting thatthe line simthite ie de exelusvey 0 sulle ells
ions bergen the ings and ontput tzauaduces, Une ort rnding ik
the top bevans the diseomictie in the trish ark Tikes
Incite tisiin of the nonresctng device bving aaeasured, ane com
feajcatly thes iris ean only rien The crapemission, over ere
On he other band, whiting hae ie structure is due exchariely
te resonerofspurivas swe, ne aneect ending is hllway Berar
the top and the bot since the transmis eat be increas oe
frets with tesmaine® A eompronise berwcen the twe extrem
readings isthe avers

‘Nowe car lle et the sesuks, ‘he apni af the bané-spiting
filter of Pig. are shown in Pus. 4), (a) and (0), together with the
eres cis the gezerstor, Fi, 1

@

Tig: — (9 ompatt pres;
202 1H WRIA ASTRA URONIC SACRA, FANCY TOT

or from cute she band spitting flier ae 1. ot 0: asortion
thee Tor wich mone “umpore Fig iwi, 1b) wd cdl bas even as
lowe to tof’ a 73 me the sssrtion In i neresrd bi aly Hh Te
Ta a ba ot th ap iting le ver aur

Twi he doen fy Sevtone TT snd V tht, of the 1.50. db ase.
tion ee for either stb, 05 diye in oh byl and ~O2! db
in each elo. This agoanss far ~12 dy; the raining 0.3 ob st
be acute fo lier the rent He enary. Avy ssa we
Aeetion of loses wil have to eome Zmm impraverent of the hybrid

ow do we adjust the band spliting filter? The requeescal Ua
he power seeobizing at sack bys mnt Hollow epual veto
phe: Frequencies belo ete? neque pathy ia Fg. 90 e ident
te uf, and feequoncre cove eatefl mist have iy ch te iii ts
ty! urs The fact that the etustment tae Feapincie. bln all
ie ceporlent of tlt wsggesta n tenstep pred in -shich tho
sete ltr he

fa) em ya ay” ar nse power port 1 max a
port 2)

(h) vim ag and tg forenoon power in ue asi i
por th

‘We deveibe next each me of the anv-splitting filter aon poves

‘Consider an inte volnme of metal in hich ta innit long
‘vinden lee of equtl igen ase bored ip me wey Ub ae
race on oplanas one cial oh ah ni Pye 3. We th are
‘eo eslnieal waveguides malig a ere Ty? mals fod > ono of
He aie one sigh sug the junetion ls. pera
evidell the inanetor of the wave Bemus Inger thay Ue fee
fotcr sarsength, The newer fa that wane dealing hn alent
pla pers,

‘Nine eu in ne Sutin this ple wb of rte
to be desreed inter. "The ace puszee through the inlereceton of The
xcs of the waveguides ard mulers an ange af 46° vith each of them.
This thin layer ete wea semitrursperces mieror, ond ES mode Ted
inno often itn rans esr ough ad pty
rellesed co one of He side anne If she peer division ia half end bal
the junerion bovorars tv 1 ll the poner in rete heel
ret.) se ‘uncon eet ol, oe Hi

"The semitranspatestmittor esa bo obtained wih sheets of diets,
‘si mesh evapomtad fl ee
iin 2k woe; (capa vm
201 ay we seer meonnteaL JOKES, INURE LOB

Big. 6 (4) Tha how a Bini: epee vine
masuearcnnss TIER 26

Por of the power wnt through oe of thos hybrid i convert to
muy caudes, wget gant of whi: eal be recovered by meifying
‘the mirror sgt, Inf, the ivdeat mace can be considered the
Sry liow fay info tush af plane wavelets all taraling altos
eral fu te avs of she wavewtide and esek ene ampingie mh di
ferent poatiaation om the sotrapant mierts Ava saree of
the pebrietion eorh wnveles Yass vn terion cole Neale
conversion ean be avoided by making the lu reaction eoeiceale
Heuteal this eax bo achieved witha nonnaformssnitransparent
rirror— for exanaple, if Ye set ie dielelee ue wire mes, the hike
tees of the delete othe deity of the les mus. be a ion uf
the sein

Tet ue eee the experimental mais. Tw Iyeids were asenbled
wing ket for tho semilroupreat tor, The Ucknessee were de
Terni sxrinnatelly to provide 2b power dvion in te £0 to £0
‘ne band. Thee sheets of lass with a total thickness of UOIS inch
‘were aretld falo Hslaid No. 1 Tae other, Tyhvid No, as a5-
Stonbled ih itr short of gle with fot thitkues of 0021 ine
‘lhe power livin ait not hange rapidly with thickness, aod the two
mires appaured to be the oes: cambinations octaizable witt cho
‘valle wes sete

Similar metsurenccrss weve anal le énlerninw the perfiancre of
both hyoride av, sins tho ts wee ery sma, Fig 7 skews oaly
tose for Hylrid ‘No. The wuts from ste atl 4, igs. Tia) td
Fike wre mery ep aang eae to 8 dy pone diison

\ iveted to eels theineeton los sad the hale of the by
is Serine wet. The Tene part hsb ere tos. two pot strcture
Dy ini refering pinot in arta ead 4, Fig. P(e) Uy adjusting
the evacive position ofthe pistons, the paver transsson is massa.
With this aciene the treated power erst the hybrid fe, ne
ing toward the pistons and sond, bounsing eons them. Figs Te)
fel stone “range an tert level. "The efetezee level ie
sown in Fig. Tle). Tin cata eee of the hyd is approximately
1b 0. by, The rect power teu the hybrid wish tha pao
erp svall bee Fi. Ful heeaner ie quite simar to tae power er
ested in the intemal smaveien of the meaning aet, Fig. 1. This
andes iv that fe | db insertion oss ie wot de to 2eieiona
Taher lo mone conversion sword, tha over the rage frm 31.0 00
DS hae te power vn Te yi is foqueney-ineersiivs, ince
‘otiean the etn soul tn hs reed er he hae

"The respons of Tye New, Ted 2 Tro 6 te 8 Rae aed Sonn
205 me aan seria rocusiens 1ouKmaL, s8nuanY 198