Test1 - EEE 443591#I Antennas for Wireless...

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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 alive-aliens? antenna 9. The plane that contains the electric-field vector and the direction of maximum radiation is referred to as the E‘ - MM. . 10. The plane that contains the magnetic-field 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 time-varying 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 circularly-polarized are: 2. * L ' rm: «mm. 18. An electric field that has 2 o ogonal components transverse to the direction of opagation can still be linearly-polarized 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 9-0 . 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. Fill-in the blank. 32 33 34. 35. 36. 37. 38. 39. 40. PM = cg wmg - afi sin6d6d¢ S' . Fill-in the blank. Pm, 2? {Ana sin6d6d¢ . F ill-in 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 Fill-in 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“, QUE-cpsfio" Dot: 4-“. Wu“ ) awn“: Shfitfié¢\ H a: L chafl‘fi-h. (PG-1:330" E‘Cafl : S (“(9.43 mfiAfi-w Z: Es-kwmflfsmw :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 3-D 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. quLiSthXO-p‘c): fp‘mgfl :; '0 =. m .= 0.04WEBXI5 ' _|2 = 4Q.SBX10 (AD/CW?" _Iz \rJYMQM : wmbsofixoPQEO = ammo Letizia): 1343-Imb' .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.

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Test1 - EEE 443591#I Antennas for Wireless...

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