Variable permittivity dielectric material loaded stepped-horn antenna

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TABLE OF CONTENTSChapterPage1 INTRODUCTION 12 MATHEMATICAL MODEL 52.1 Mode Matching 52.2 Generalized Scattering Matrix 112.3 Method of Moments 172.4 Half-Space Admittance 272.5 Antenna Characteristics 333 PERFORMANCE OPTIMIZATION 354 NUMERICAL RESULTS 415 CONCLUSIONS AND FUTURE WORK 80APPENDIX TAYLOR EXPANSION OF GREEN FUNCTION INTEGRALS . 82BIBLIOGRAPHY 85vii
LIST OF TABLESTablePage4.1 Amplitude and Phase of Reflection and Transmission Coefficients of TE10Mode in an Empty Horn of Length L = 2.5A and Free Space WavelengthA = 0.03m 424.2 Amplitude and Phase of Reflection and Transmission Coefficient of a TE10mode in a Dielectric (ε r = 2.5) Loaded Horn Antenna of Length L = 2.5AA is the Wavelength Inside the Dielectric Medium 424.3 Amplitude and Phase of Reflection and Transmission Coefficient of TE10Mode in an Empty Horn Antenna of Length L = 2.5 A. A is a Free SpaceWavelength. 434.4 Amplitude and Phase of Reflection and Transmission Coefficient of a TEE)Mode in a Dielectric (εr = 3) Loaded Horn Antenna of Length L = 2.5AA is the Wavelength Inside the Dielectric Medium 444.5 Comparison of VSWR's and Gains of the 20 dB Standard Gain Horn Antenna. 444.6 Optimization Values of Stepped-<strong>horn</strong> Antenna for Input Waveguide Size, al =0.73A, b 1 = 0.34A and Aperture Size aA = 1.8A, bA = 0.77A. 484.7 Optimization Values of Stepped-<strong>horn</strong> Antenna Input Waveguide Size, a l =0.73A, b 1 = 0.34A and Aperture Size, aA = 2A, bA = 0.82A. 50viii
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 12 and 13: LIST OF FIGURESFigurePage2.1 Geomet
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
Page 68 and 69:
Figure 4.5 Aperture efficiency vers
Page 70 and 71:
Figure 4.7 Input reflection coeffic
Page 72 and 73:
Figure 4.9 Aperture efficiency vers
Page 74 and 75:
Figure 4.11 E-plane pattern versus
Page 76:
62Figure 4.13 Input reflection coef
Page 79 and 80:
Figure 4.16 Aperture efficiency ver
Page 81 and 82:
Figure 4.18 Amplitude of aperture m
Page 83 and 84:
Figure 4.20 Amplitude of aperture m
Page 85 and 86:
Figure 4.22 Input reflection coeffi
Page 87 and 88:
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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