Variable permittivity dielectric material loaded stepped-horn antenna

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LIST OF FIGURESFigurePage2.1 Geometry of pyramidal a horn antenna. 62.2 Stepped-waveguide model of tapered region of horn antenna. 62.3 Radiating aperture of a horn antenna 72.4 Step discontinuity between i-th and i + 1-th waveguide sections. 82.5 Scattering matrix representation of cascaded discontinuities 172.6 Generalized reflection matrix representation of an aperture. 182.7 (a) Original problem (b) Equivalent problem (valid only in waveguide section)(c) Equivalent problem (valid only in half space section ). 192.8 Rooftop expansion function for MX and MY 233.1 Stepped-horn antenna with variable dielectric loading for excitation of TE30mode at the aperture with 1/3 amplitude ratio of TE10 mode 363.2 as and aA width of H -plane step for TE30 mode amplitude in the ratio 1/3 tothe TE10 mode excitation. 394.1 Input reflection coefficient versus frequency for dielectric (εr = 2.63) loadedopen-ended waveguide radiator with length of L = 9.51mm 454.2 Stepped-horn antenna model 474.3 Input reflection coefficient versus frequency of εr = 1.5 dielectric loading ofhorn antennas with uniform loading, step loading, linear loading and emptyhorn antenna 524.4 Gain versus frequency of dielectric (ε r = 1.5) loaded horn antennas withuniform loading, step loading, linear loading and empty horn antenna. . . 534.5 Aperture efficiency versus frequency of dielectric (εr = 1.5) loaded hornantennas with uniform loading, step loading, linear loading and empty hornantenna. 544.6 Cross-polarization level versus frequency of dielectric (εr = 1.5) loaded antennaswith uniform loading, step loading, linear loading and empty horn antenna. 554.7 Input reflection coefficient versus frequency of the dielectric (εr = 1.2, εr =1.5, εr = 1.7) loaded horn antennas and empty horn antenna. 56ix
FigureLIST OF FIGURES(Continued)Page4.8 Gain versus frequency of the dielectric (ε r = 1.2, εr = 1.5, εr = 1.7) loadedhorn antennas and empty horn antenna. 574.9 Aperture efficiency versus frequency of the dielectric (εr = 1.2, εr = 1.5 andεr = 1.7) loaded horn antennas and empty horn antenna. 584.10 Cross-polarization level versus frequency of the dielectric (ε r = 1.2, εr = 1.5,εr = 1.7) loaded horn antennas and empty horn antenna. 594.11 E-plane pattern versus 0° of the dielectric (ε r = 1.2, εr = 1.5, εr = 1.7)loaded horn antennas and empty horn antenna. 604.12 H-plane pattern versus e° of the dielectric (εr = 1.2, εr = 1.5, εr = 1.7)loaded horn antennas and empty horn antenna. 614.13 Input reflection coefficient versus frequency of the stepped-horn antennas for(εr1 = 1.0 εr2 = 1 .0), (εr1 = 1.2 εr2 = 1.2), (εr1 = 1.0 ε r2 = 1.2),(εn = 1.2 εr2 = 1.0), and empty horn antenna with length L = 80.2 mm. . 624.14 Gain versus frequency of the stepped-horn antennas for (ε r1 = 1.0 εr2 = 1.0),(εn = 1.2 εrg = 1.2), (εn = 1.0 εr2 = 1.2), (εn = 1.2 εrg = 1.0) andempty horn antenna with L = 80.2 mm. 634.15 Cross-polarization level versus frequency of the stepped-horn antennas for(εr1 = 1.0 ε r 2 1.0), (εr1 = 1.2 εr2 = 1.2), (εr1 = 1.0 εr2 = 1.2),(εn = 1.2 εr2 = 1.0) and empty horn antenna with L = 80.2 mm. . . . . 644.16 Aperture efficiency versus frequency of the stepped-horn antennas for (ε n =1.0 εr2 = 1.0), (ε r 1 = 1.2 εr2 = 1.2), (ε r1 = 1.0 εrg = 1.2), (ε r1 = 1.2εr2 = 1.0) and empty horn antenna with L = 80.2 mm. 654.17 Co- and Cross-polarization patterns for stepped-horn antenna (εr1 = 1.2 εr2 =1.2) and empty horn antenna with L = 80.2 mm at f = 10 GHz. 664.18 Amplitude of aperture magnetic field distribution,H x versus x and y for emptyhorn antenna with L = 80.2 mm at f = 10 GHz 674.19 Amplitude of aperture electric field distribution,Ey versus x and y for emptyhorn antenna with L = 80.2 mm at f = 10 GHz 684.20 Amplitude of aperture magnetic field distribution,H x versus x and y for (εri =1.0 εr2 = 1.0 )stepped-horn antenna at f = 10 GHz. 694.21 Amplitude of aperture electric field distribution,E y versus x and y for (ε n =1.0 εr2 = 1.0) stepped-horn antenna at f = 10 GHz. 70
Page 1 and 2: Copyright Warning & RestrictionsThe
Page 4 and 5: VARIABLE PERMITTIVITY DIELECTRIC MA
Page 6 and 7: APPROVAL PAGEVARIABLE PERMITTIVITY
Page 8 and 9: To my parents, ..Tahsin and Güler
Page 10 and 11: TABLE OF CONTENTSChapterPage1 INTRO
Page 14 and 15: FigureLIST OF FIGURES(Continued)Pag
Page 16 and 17: 2field uniformity and this results
Page 18 and 19: 4from improving the gain, dielectri
Page 20 and 21: Figure 2.1 Geometry of pyramidal a
Page 22 and 23: 84Figure 2.4 Step discontinuity bet
Page 24 and 25: 10section asFrom (2.4), the transve
Page 26 and 27: 12and for the magnetic fieldIn the
Page 28 and 29: 14where * shows complex conjugate.
Page 30 and 31: 16where D is a diagonal matrix of t
Page 32 and 33: 18Figure 2.6 Generalized reflection
Page 34 and 35: 20aperture region and 11Ps is the m
Page 36 and 37: 22where T; (x) and T: (y) are trian
Page 38 and 39: 24where Γwghnk and r wg enk are th
Page 40 and 41: tiTo determine the unknown coeffici
Page 42 and 43: 28An electric vector potential F an
Page 44 and 45: 30Using midpoint rule to evaluate i
Page 46 and 47: 32whereGreen function integrals, 4,
Page 48 and 49: 34taper and the phase distribution
Page 50 and 51: 36Even though, TE10 mode is an inci
Page 52 and 53: 38satisfy the amplitude ratio of 1/
Page 54 and 55: 40would be slight deviation from th
Page 56 and 57: 42increased to 15. Scattering matri
Page 58 and 59: 44Table 4.4 Amplitude and Phase of
Page 60 and 61: 46Figure 4.3, it is obvious that th
Page 62 and 63:
48al = 0.73A, b1 = 0.34A and apertu
Page 64 and 65:
50Table 4.7 Optimization Values of
Page 66 and 67:
Figure 4.3 Input reflection coeffic
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Figure 4.5 Aperture efficiency vers
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Figure 4.7 Input reflection coeffic
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Figure 4.9 Aperture efficiency vers
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Figure 4.11 E-plane pattern versus
Page 76:
62Figure 4.13 Input reflection coef
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Figure 4.16 Aperture efficiency ver
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Figure 4.18 Amplitude of aperture m
Page 83 and 84:
Figure 4.20 Amplitude of aperture m
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Figure 4.22 Input reflection coeffi
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Figure 4.24 Cross-polarization leve
Page 89 and 90:
751Figure 4.26 Amplitude of apertur
Page 91 and 92:
770.8Figure 4.28 Amplitude of apert
Page 93 and 94:
Figure 4.30 Amplitude of aperture e
Page 95 and 96:
81Dielectric materials of various p
Page 97 and 98:
The indefinite integrals associated
Page 99 and 100:
BIBLIOGRAPHY[1] P. Clarricoats, A.
Page 101 and 102:
87[26] T. Bird and S. Hay, "Mismatc
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Variable permittivity dielectric material loaded stepped-horn antenna

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