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Horn Antenna

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Published in: Electronics
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Brief history, usage, Applications, Advantages and disadvantages of Antenna

Sharath / Delhi

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  1. äT'#n•t tåTil Oil,iklE'tIi fiölitn Amr+iöllfi HORN ANENNA ???? " ??? ????? ?? ?????????????????????? ???? ?? ???? ??????????????
  2. 0 N ANTENNA
  3. (H?STOfflY & flffilTfflomJCTflON..v ANINNA?, Prezi
  4. - tinc of lhe' !lira hem U1d.j!2üCU tm) constructed in 1897 by Indion' radic Coeur «?? ????????? ra???? ft\eae in ?! exper)rncnl,i with (t!i@roteat•es n" 13?. ??? ????? sas *'Bf . 0+ coevo ci$b ? ?? -
  5. 1930b.. • the first experimental research (Southworth and Barrow. 1936) • the first theoretical analysis (Barrow and Chu, 1939) of 'hornS as antennas yyrrvS Prezi
  6. corrugated horn invented by ray in 1962 has become Widely used as a feed horn for microwave antennas satellite dishes arid radio telescopes Prezi
  7. 1 ("Iprezi Ill V+%vgguidt • A flared-out Cor opened-out] waveguide • fUnctiont produce a uniform phase front with a larger aperture than that of a waveguide • Hence greater directivity
  8. TIES OF HORN ANTENNAS roe
  9. RECTANGULAR HORNS Wavegujde Throat (a) Exponen(iajty tapered pyramidal (b) Sectorai 110ara (C) Seeal C•g2ano (d) Pyramruai GIPrezi CIRCULAR HORNS (e) Exponentjaliy tapered (f) Conical (g) TEM Aus (h) TEOt bcmcai
  10. Idr&e. Gatedite ih used in 'to communicate 3,41ith the dirzczt e.ommunicutiöil,s Il Prezi
  11. Fornat6s prjncjpJ@ (Principle of equality of path
  12. Roctang)ußar Horn Antenna (Iperture in both planed of rectangular horn eucecdJ 1 {Pallet-rt in one plane independent of lhc clhcr, The H-plane pattern of an plane sectoral horn - I-I-plane pattern o? an H-plane pyramidal horn with Same H plane croSS Section. The E-plane pattern o? an E plana sactoral horn = E-plana pattern of an E-plane pyramidal horn With Same E plane croSS section. v;wwäfrtenna-theory.com • throat aperture I Il prezi
  13. sec non. • Total Flare Angle: theta E/H • R=radial length from throat to aperture • L-axial length from throat to aperture • aE/aH- aperture length I ei3Drezil
  14. 5tI OTE H-ptar•e Figure '7-43 Measured F.- and t/•plane field patterns of rectanguiarhoms as a runction of flare angio and horn length, (,0icr Rhodes-I:)
  15. Why [HI-fjolldl at tha aperture? Aperture fields radiate in spherical uravas: l.projected juncture of the sides extra diStance along tha sides • Placing a Source at the phase centre in the neck o? the horn. 20. Ot 2 dimensional ectori•i born. • The wavefYont at the neck o? the horn-plane 'With a cosine aperture distribution. • Secondary wavelets than radiate from the plane wave section and arrive at a point P. • Cancel out- hence H field is zero
  16. Hot" Figure 7-44 Expentrjentatiy delecrmned agtimum dimensions (ectanguiarhotn Solid curves relation ot angle O/ .in $ plane and ftate angle in to hotti length (see Fig. 7-42), The corresponding t.vsamwid\hs and ato indcatød the curw,5. Dashed show tot — 025 and Where etTectsvc apetture, ni2 physical aperture, aperture wavelength. m (d.Bi) Assume atleast 1 lambdæ
  17. 300 Hajt•power widths 119 E.ptano 5 6 7 8 910 12 14 161820 25 30 Hotn length. t.x Apertures wavelength5 'igure 7—44 Experimentally determined optimum dimensions for rectangular horn antenr curves grve relation of flare angle in E plane and flare angle (in in plane to horn ler 5ee Fig. 7—42), The corresponding half-power beamwidths and apertures in wavelengths a
  18. where 2 = effective apcrturc, m physical aperture, me = aperture efliciency = Ad/ A p wavelength, m
  19. 0.6, Assume 'r' atleast 1 lambda„
  20. or D z 10 log 7.5Ap 12 (dBi)
  21. D 10 log(7.5aExanx) where E-plane aperture in X atti hi-plane aperture in
  22. Type o' aperture Beamwidth, deg Between first nulls 1 15 Uniformly illuminated rectangular aperture or linear array 140 Uniformly illuminated circular aperture 115 Optimum E-plane rectangular horn 172 Optimum Il-plane rectangular hom aux = Ot rectanmAar aperture Ot array in wavelengths — d,ametet ot occuiar aperture in free-space an at*'ftute E piano in free•spaeo wavoongths at/Å in piano tree.ace Between haif•power points 51 67 aux
  23. Èt@tlprezi
  24. !ZäAd wnLdZS
  25. Corrugated horns can provide reduced edge diffraction, improved pattern Symmetry and reduce cross-polarization(less E field in the plane). Corrugations on the horn walls acts as chokeS that reduces the E to very low values at all horn edges for all polarization. (ejRregif-l
  26. By attaching a smooth curved Surfäca section to the outside of the aperture edge of a horn,we can achieve a significant improvement in the pattern. the radius of the curvature should be at least lamda/Ll
  27. Conical Horn Antenna • directly excited from a circular wave guide. optimUm conical horti 6iveS half frowar beå.liididths 6'/ the values for a horÅ in plane. Bioonicalhorns are modified pyramidal horns With a 360 degree flare angle in 'the horizontal plane, BWSO___ Prezi The eptimum yarfiqakplane flare angle iS21t abeuftha as $or,a Sectoral horn o? the erne co-NS Section e.%g.itsd in the Same mode Optur,u-rn vs
  28. LnJUJ J Antenna directly excited from a circular wave guide. optimum conical horn gives half power beamwidths more&han the values for a rectangular horn in E and H plane. Riconical horns are
  29. • directly excited from a circular wave guide. • optimum conical horn gives half power beamwidths d more than the values for a —rectangular horn in Eand H plane. • Biconical horns are modified pyramidal horns wit a 360)degree flare angle in the horizontal plane, • The optimum vertical-plana flare anglai* about the same as for a sectoral horn o same cross section excited in the same
  30. non-direction*l ttern oar / Ant neontd Field Pattern 330 •c 45 60 255 2to 65
  31. lane, • The optimum vertical-plane flare angle -is about the same as fora sectoral horn of the same croSS section excited in the Same mode.
  32. ? 9 ? TEM
  33. Optimum dimensions VS Directivity 45 12 10 14 15 16 17 18 19 20 21 22 23 24 Directivitv Prezi
  34. Horn Antenna are used as feed horn used For Short range radar SyStemS Horn antennas are often used as gain standard Horn antennas are extensively used at microwave frequenciaS when the power gain needed is moderate It has medical imaging Application
  35. Advantages Broad bandwidth Simple construction and Provides a significant adjustment level o? directivity and gain Djsadvantagos 'Iha disadvantage is that it is far larger and heavier for a given aperture area than a parabolic dish and must be mounted on a cumbersome turntable to be fully Steerable
  36. • Mâterial technolo&y developïnent in horn antenna technology. Selective materials be Create horns, Fabrication techniques al$o improvedq for exampE herns can be fèbricated' lightat• waie,ht dielectrics c.cated in conductive surfòces. noug Werner. professor electrical engineering, and his re$earoh group developaa a batter horn antenna usine materiaIS. tota matariaIS can be uSed to enhance a practic.al by creatine 'à lighter horn antenna communicaticmS satellites. reduaing iltei&ht dramatic.ally raduces the cost of launchitl& a satellite into spacB • A new photoconductive horn antenna With a uni-directionel radiation pattern thus more radiated power the antenna can be collecteti at -the; dasired direction. A direc.tMty or 13,7 be achievea by {his new • To design high-efficient rnulti-mcaa hejrn.S. ZICRA'S &ed-horn tool, CHAMP. updateel to allobf Simultane.ous optirnizatien the antenna performance' • A maior accomplishment was the design and Èbrication of the large, 210 diameter radomes to protect tha earth station antennas for the Telstar satellite communications System,These radomes made of horh Anteenxs, • In 20CZ the IEEE recognitecl Telstar and ils associated eround station$ as an electrica! engineering historical mileStone; Ihe radome in FYanOe presently -Serves a telecomrnunicationS tnusaurn.
  37. Arecibo Observatory • Radio AStronomy • Aeronomy • Radar Astronomy Conducts exp by scientists who want to use the telescope
  38. Possible UFO phenomenon!
  39. Gregorian Dome switch ble feed horn frequency range: 1-10Ghz low freq
  40. !zald •dxa Duumuo
  41. (Referenced.. • Antennas and Wave Propagation: Fourth Edition By John D Kraus, Ronald J Marhefka, Ahmad S Khan • Royal Signals and Radar Establishment • A W. Love, ed, Electromagnetic Horn Antennas, IEEE Press, New York. 1976. • 0-ligh performance horn antenna design Carlos del Rio Bocio Antenna Group Public University o? Navarra. • urnrwbbcco.uk • unxrfspin.cz/en/antennas/
  42. … … )INVHJ
  43. äT'#n•t tåTil Oil,iklE'tIi fiölitn Amr+iöllfi HORN ANENNA ???? " ??? ????? ?? ?????????????????????? ???? ?? ???? ??????????????

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