This book focuses on the understanding of the Cylindrical Dielectric Resonator Antennas (CDRA). The book introduces the fundamentals of DRA, CDRA, identifying the modes in a CDRA, excitation techniques and recent advancements pertaining to the research of the CDRAs. The latest trends in the field are discussed, including wide bandwidth of operation, high gain, modal stability, mode and impedance matching techniques, Circularly Polarized CDRAs, beam forming and MIMO applications for modern wireless systems. The experimental validation, testing, fabrication methods and machining to achieve cylindrical and its reformed shapes are also presented.
Author(s): Biswajeet Mukherjee, Monika Chauhan
Publisher: Artech House
Year: 2021
Language: English
Pages: 290
City: Boston
Dielectric Resonator Antennas
Contents
Acknowledgments
1
Introduction to Dielectric Resonator Antennas
1.1 Genesis of Dielectric Materials as Radiators
1.2 RDRAs and Their Modes
1.3 CDRA and Its Modes
1.4 HDRA and Its Modes
1.5 Equilateral Triangular DRA and Its Modes
1.6 Conclusion
References
2
DRA Bandwidth Enhancement Techniques
2.1 Various Feeding Methods
2.1.1 Coaxial Probe Feed
2.1.2 Microstrip Feeding
2.1.3 Aperture or Slot Feeding
2.2 Bandwidth Enhanced by Stacking of Various Permittivity Layers
2.3 Metallic Loading
2.4 Compact and Low-Profile Geometry
2.5 Fractal- and Reform-Shaped Geometry
2.6 Conclusion
References
3
DRA CP Techniques
3.1 Circular Polarization by the Single-Feed Technique
3.2 CP by Multiple-Feeding Techniques
3.3 CP by Geometry Modification Techniques
3.4 CP by the Array Configuration Technique
3.5 CP by Switchable Feeding Techniques
3.6 Conclusion
References
4
DRA Gain-Enhancement Techniques
4.1 Gain Enhancement by Loading a Metamaterial or Frequency-Selective Surface on a DRA
4.2 Gain Enhanced by Metal Integration of the DRA
4.3 Gain Enhanced by Higher-Order Modes
4.4 Enhancing Gain with a Dielectric Resonator Array System
4.5 Enhancing Gain by Stacking Various Materials
4.6 Conclusion
References
5
Multiple-Input and Multiple-Output DRAs and Diversity Applications
5.1 MIMO Antenna Characteristics and Attributes
5.1.1 Reflection Coefficient (R)
5.1.2 Transmission Coefficient (t)
5.1.3 Envelope Correlation Coefficient
5.1.4 Channel Capacity Loss
5.1.5 Mean Effective Gain
5.1.6 Total Active-Reflection Coefficient
5.2 Single-DRA Element with Dual- or Multiple-Feeding Techniques for MIMO Applications
5.3 Dual-DRA Elements with Dual- or Multiple-Feeding Techniques for MIMO Applications
5.4 Multiple DRA Elements with Multiple Feeds for MIMO Applications
5.5 Conclusion
References
6 Fabrication, Experimental Setup, Measurement, and Practical Considerations
6.1 Dielectric Material and Its Selection
6.2 Limitations in Practical DRA Considerations
6.3 Fabrication Methods and Machines
6.4 Various Measurements of the DRA
6.4.1 Measurement of the S-Parameter
6.4.2 Far-Field Measurement Setup
6.4.3 Gain and Antenna Radiation Efficiency Measurements
6.4.4 CP Measurements
6.5 Conclusion
References
About the Authors
Index
