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Unformatted text preview: EEE 443591
#I :
Antennas for Wireless Communications
#11:
Test #1
#111: Tuesday, February 20, 2007 90 Minutes Maximum Instructions: Closed book, closed notes, closed homeworks, closed everything. N0 laptops; only HANDHELD calculators. ALL problems must be solved ANALYTICALLY; must show ALL STEPS to get credit. NO computer solutions; will violate instructions. NO GRAPHICAL SOLUTIONS; no credit will be given. 6. Put problems in order; start each problem solution on a new page; only front
pages, please. 7. Return test copy along with your solutions. P‘P‘L‘ 5"?" (Name of Student — Write Your Name) P. S. Before you start solving a problem, make sure you read it very carefully as to
what is given and what you are asked to solve for.
Using the incorrect values from the start ofthe problem will jeopardize the solution of the entire problem. Total Pages — 5 ® ARIZONA STATE UNIVERSITY
Department of Electrical Engineering EEE 443/591 Test 1 February 20, 2007 1. Complete the missing words in the blank spaces. Place them in the res! sheet. 1. An ante is a device that, in the transmitting mode, converts with waves into £6“.  ML waves. 2. Constructive and destructive interference patterns inside transmission lines
connected to antennas, referred to as Bimini; waves, are formed by
reﬂections from impedance mismatches between the transmission lines
and the antennas. 3. An aggregate of individual radiating elements (antennas) in an electrical
and geometrical arrangement is referied to as an AWE . 4. To create radiation, there must be a Wu  «gm? current or an ﬁtsglﬂ Itl 195 or Autltmﬂbg of charge.
5. To excite ﬁelds lgwia charges are required but are not needed to sustain them. 6. The length I (in wavelengths) of a wirefdipole antenna fed at the center
whose current maximum occurs at the feed is equal to Ql ’1— .
Assume 0 E l _<_ 7L. 7. A radiator having equal radiation in all directiOns is referred to as an lsci'to tit. radiator. 8. A radiator having the property of radiating or receiving electromagnetic
waves more effect' ely in some directions than in others is referred to as a alivealiens? antenna 9. The plane that contains the electricﬁeld vector and the direction of
maximum radiation is referred to as the E‘  MM. . 10. The plane that contains the magneticﬁeld vector ang the direction of QM maximum radiation is referred to as the H  1 1. The region most immediate to the antenna where the reactiv ﬁeld
predominates is referred to as the TwCiIUtL gem: it region. 12. The region of an antenna where the angular ﬁeld distribution is essentially
independent of the distance from the antenna and wh‘ereghe real power
density predominates is referred to as the it}  l l region. 13. The ratio of the radiation intensity of an antenna to the radiation intensity
of an isotropic source is deﬁned as the giggled; of the antenna. 14. The angular separation between two identical points end? amplitude
pattern of an antenna is referred to as the 'QQMUJI d . 15. The range of frequencies within which the performance of an antenna. with respect to some characteris 'c, conforms to a speciﬁc standard is
referred to asthe homagmﬁgg, . 16. The ﬁgure traced, as a function of time, of the extremity of a timevarying
electric ﬁeld vector at a ﬁxed location in space on a lane perpendicular to
the direction of propagation is referred to as the ripe gttgﬂigg . 17. The three necessary and sufﬁcient conditions that must be met in order for
the electromagnetic wave to be circularlypolarized are: 2. * L
' rm: «mm. 18. An electric ﬁeld that has 2 o ogonal components transverse to the
direction of opagation can still be linearlypolarized provided I'
Etna lo rt 15 mt menu“ 19. The polarization of an electromagnetic wave that has:
a. Two orthogonal components transverse to the direction of
prOpagation
b. The components are of equal magnitude.
0.“ The phase difference between the two ﬁeld components is 45°
is E 3' ﬁlm; .
20. The factor that accounts for the polarization mismatches between an
incident wave and a receiving antenna is referred to as the etht'mgﬂ 3m in; factor or ﬂit“ iigﬂtoi'x efﬁciency. 21. The real parts of the input impedance of an antenna are referred to as the Wildiﬂitgb resistance and the i035 resistance. _
22. The antenna radiation efficiency is deﬁned as the ratio of the mad tab Resistance over the sum of the (agitation resistance and loss
resistance. 23. For a linear wire antenna, its maximum effective length cannot exceed it
ptiésimg length. 24. For an aperture antenna, its maximum effective area cannot exceed its gig? _ area.
25. The rat 0 of the maximum effective area to the physical area of an antenna is deﬁned as the gagftt i {g gﬁ‘; g" 235% .
26. The maximum directivity of an ante a is also (1 med as the ratio of 41:
over the bmm 90 . 27. The ratio of the gain to the directivity of an antenna is defined as the  (bani 9 We. e
28. The scattering characteristics of a target are usually represented by
the \(‘Qam {3035 Sfﬁfgﬂ . 29. The equation that relates the received power to the transmitted power of
two antennas, separated by a large distance R, is referred to as the
RI! its WV «mats J 1 a3 equation.
30. The equation that relates the received power to the transmitted power of
two antennas, after the signal has been scattered by a radar target, is referred to as the ’Rodgv M1... equation. 31. Fillin the blank. 32 33 34. 35. 36. 37. 38. 39. 40. PM = cg wmg  aﬁ sin6d6d¢
S' . Fillin the blank. Pm, 2? {Ana sin6d6d¢ . F illin the blank (write the equation). 411'
@w @2Y
Fill—in the blank (write the equation). Maximum Directivity (Kraus) = 3Qn_ Maximum Directivity (Tat & Pereim) = L =.
a: + (“Bu
Fillin the blank. \=\’ let Deﬁne the following: = “Rolmimvx EEme Deﬁne the following:
NM 0L0“ z Deﬁne the following: “gm M = £49,435)=39t3(6,¢)+5¢3¢(6,¢) Deﬁne the following: Guam i:qu (lend? “115%. = maximum effective area
AP physical area R.
R +RL r 2 \‘m 3,3. What is the name of the following? T—r‘x is \(ommiss'lm E E! l 92‘ ":5 I 2
i = GOIGDr
R 4::R .1 N = a“ mad? 0“$3 ‘30“, QUEcpsﬁo"
Dot: 4“. Wu“ ) awn“: Shﬁtﬁé¢\ H a: L
chaﬂ‘ﬁh. (PG1:330"
E‘Caﬂ : S (“(9.43 mﬁAﬁw Z: Eskwmﬂfsmw :fu‘zé‘l‘k
11 2. O 7’ D “1 7..
R03? (EX'2) = 34
D :7; 4W0 1g "ﬁlm 2 O 11% AS :: Q05<b\ 10.15 2} d; : QDgHFC 0.5}:Qg§‘(ﬁtufrﬁo¥j:BSO If. , Prob1em 2
Input parameters:
The lower bound of theta in degrees = 0
The upper bound of theta in degrees = 180
The lower bound of phi in degrees  90 The upper bound of phi in degrees ; 270 Output parameters: Radiated power (watts) = 2.4671
Directivity (dimension1es = $.0930
D'i recti vi ty (dB) = Page 1 Problem 11 3D Gra hical Illustration Q CE)
I 0.223 PDD(Z/g1:Q.286 Agzlo 528:. M219, (aiﬂ
. "Do (914 :_ 5.1% an. ._ r0" ;3.3H—54 (AHA q
M: 10 moot; J ﬁt 1300 «Na: 2,3:‘ﬁxw :‘gqaqtﬁ a?
(h. quLiSthXOp‘c): fp‘mgﬂ :; '0 =. m .= 0.04WEBXI5 ' _2
= 4Q.SBX10 (AD/CW?"
_Iz \rJYMQM : wmbsoﬁxoPQEO = ammo Letizia): 1343Imb'
.311
chm2' Wraﬂ’ﬁm a 134.11»: 19 (‘2. L. "Din/4) = 6. 23:, 4’8 2. 3.31454 Aim. L '2'
2.
0mm: 34,590 = 5:321“ 3.342%): (915 M RR = WMWA 1&“(3 LO 2 {34Fam'6ﬂa—‘O: 05,025“. earmo r.“
R“ = WOQSGQQQ “lama ...
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This note was uploaded on 11/01/2009 for the course EEE 443 taught by Professor Balanis during the Spring '08 term at ASU.
 Spring '08
 Balanis

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