Antennas in Inhomogeneous Media

List of Tables

Acknowledgments

List of Principal Symbols


1. Introduction


1.1 Scope and Limitations of the Treatment


1.2 Field Equations


1.3 Hertz Potential


1.4 TE and TM Modes


1.5 Definitions of Antenna Impedance or Admittance


1.6 References


2. Thin Wire Antennas in Free Space


2.1 EMF Method


2.2 Hallen's Method


2.3 Storer's Variational Solution


2.4 Thin Wire Loop Antenna


2.5 Appendix: Hertz Vector of a Cylindrical Wire


2.6 Exercises


2.7 References


3. Slot Antennas in Free Space


3.1 Concept of Complementary Antennas


3.2 Rectangular Waveguide with an Infinite Flange


3.3 Coaxial Line with an Infinite Flange


3.4 Exercises


3.5 References


4. Dielectric Loading of Small Antennas


4.1 Dielectric Loading of Electric Dipole Antennas


4.2 Lossy Cores for Loops and Capacitor Type Antennas


4.2.1 Loop Antenna


4.2.2 Dipole Antenna


4.2.3 Comparison of the Two Antenna Types


4.3 Lossy Shells Surrounding Loops and Dipoles


4.4 Exercises


4.5 References


5. Transmission Line Theory of Buried Insulated Antennas


5.1 Impedance of the Buried Insulated Wire


5.2 Mutual Impedance of Two Buried Antennas


5.3 Surface Excitation by a Buried Vertical Line


5.4 References


6. Antennas in the Interface Between Two Media


6.1 Thin Insulated Wires


6.2 Long Slots


6.2.1 The Narrow Slot


6.2.2 The Wide Slot


6.2.3 The Radiation Efficiency of the Slot


6.3 Exercises


6.4 References


7. Cavity-Backed Slot Antennas


7.1 Rectangular Slots


7.1.1 Integral Equation for the Field Variation in the Slot


7.1.2 Variational Solution


7.1.3 Hallen's Method


7.2 Annular Slot


7.2.1 Slot Admittance


7.2.2 Cylindrical Cavity


7.2.3 Coaxial Cavity


7.3 Exercises


7.4 References


8. Slot Antennas with a Stratified Dielectric or Isotropic Plasma Layers


8.1 Admittance of a Rectangular Waveguide


8.1.1 The General Formulation


8.1.2 Slot Admittance with a Negligible Ex Component


8.1.3 Slot Admittance with a Non-negligible Ex Component


8.1.4 Slot Admittance for Thick Plasma Layers


8.1.5 Numerical Results


8.1.6 Admittance Measurements


8.2 Mutual Admittance Between Two Rectangular Waveguides


8.3 Admittance of an Annular Slot


8.3.1 General Information


8.3.2 One-term Approximation of the Aperture Fields


8.3.3 Two-term Approximation of Aperture Fields


8.3.4 Radiation Conductance in Terms of Surface Fields


8.3.5 Slots with Free Space and Plasma Layers


8.3.6 Buried Slot Antennas


8.4 Exercises


8.5 References


9. Impedance of Linear Antennas in the Presence of a Stratified Dielectric


9.1 Driving Point Impedance of a Single Antenna


9.1.1 Impedance Formulation


9.1.2 The Free Space Impedance of a Thin Antenna


9.1.3 Antennas in a Homogeneous Dielectric


9.1.4 Antenna in Dielectric Layers


9.1.5 Antennas in Dielectric or Plasma Cylinders


9.1.6 Insulated Antennas in Dissipative Medium


9.2 Mutual Impedance


9.2.1 Impedance Formulation


9.2.2 Limiting Impedance Values


9.2.3 Free Space Impedance


9.2.4 Antenna in Dielectric Layers


9.2.5 Insulated Antennas in Dissipative Medium


9.3 Exercises


9.4 References


10. Insulated Loops in Lossy Media


10.1 Impedance Formulation


10.2 Loops in a Homogeneous Lossy Dielectric or in Free Space


10.3 Loops in Finite Layers of Lossy Dielectric


10.4 Exercises


10.5 References


11. Antennas in Compressible Isotropic Plasma


11.1 Guided Waves Supported by Layers of a Lossy Compressible Plasma


11.1.1 Field Expressions


11.1.2 Dispersion Relations


11.1.3 Numerical Results


11.1.4 Complex Power of Guided Waves


11.2 Admittance of a Waveguide Backed Slot


11.2.1 Field Expressions for a Two-layer Plasma


11.2.2 Slot Admittance


11.2.3 Surface Waves


11.2.4 Numerical Results


11.3 Impedance of a Linear Antenna


11.3.1 Impedance Formulation


11.3.2 Surface Waves


11.3.3 Impedance of a Short Antenna in an Unbounded Plasma


11.3.4 Numerical Results


11.4 Exercises


11.5 References


12. Linear Antennas in a Magnetoionic Medium


12.1 Cylindrical Antenna with an Axial Static Magnetic Field


12.1.1 Field Expressions in the Cold Electron Plasma Medium


12.1.2 Antenna Impedance


12.1.3 Impedance of a Thin Antenna Without a Dielectric Layer


12.1.4 Discussion of Numerical Results


12.2 Flat Strip Antenna with a Perpendicular Static Magnetic Field


12.2.1 Field Expressions in the Plasma Medium


12.2.2 Reflection Coefficients


12.2.3 Antenna Driving Point Impedance


12.2.4 Impedance of a Thin Antenna Without a Dielectric Layer


12.2.5 Discussion of Numerical Results


12.2.6 Insulated Antennas Above a Ground Plane


12.3 Radiation from a Short Antenna in a Lossy Uniaxial Medium


12.3.1 Formulation of the Effective Resistance


12.3.2 Radiation in the Limit of Low Losses


12.3.3 Radiation at Large Distances in a Lossy Medium


12.3.4 Summary of Radiation Characteristics


12.4 Appendix: Strip Antenna with a Magnetic Field Perpendicular to the Axis and Parallel to the Surface


12.5 Exercises


12.6 References

Author Index

Subject Index

Other Titles in the Series