Geometric Structure behind Duality and Manifestation of Self-Duality from Electrical Circuits to Metamaterials
Abstract
:1. Introduction
2. Circuit Theory
2.1. Duality between Current and Voltage
2.2. Planar Graph as Cellular Paving
2.3. Inner and Outer Orientations
2.4. Essence of Poincaré Duality
2.5. Dual Circuits
2.6. Self-Dual Circuit
3. Zero Backscattering from Self-Duality
3.1. Self-Dual Transmission Lines
3.2. Circuit Model for Huygens’ Metasurface
4. Keller–Dykhne Duality
4.1. Two-Dimensional Resistive Sheets
4.2. Duality in Laplace Equation
4.3. Generalized Duality
4.4. Effective Response and Duality
4.5. Self-Duality and Singularity
4.6. Differential-Form Approach for Duality
4.7. Summary of Basic Equations in Differential-Form Approach
4.8. Keller–Dykhne Duality with Differential Forms
4.9. Discretization
- (1)
- For I and V discretized from K and E, we can consider the dual circuit with current and voltage distributions for a circuit on :
- (2)
- On the other hand, we discretize and in a dual mesh . We need to choose a specific orientation of the plane, and is regarded as an inner-oriented edge in . Here, we introduce the ☆-conjugate operation to give an outer-oriented dual edge as . The dual edge is outer-oriented, and represented as (Figure 36), which reflects the complex algebraic structure of the plane. Then, discretized and are given as
5. Electromagnetic Duality
5.1. Preliminary
5.2. Formulation of Electromagnetic Duality
5.3. Analogy between Keller–Dykhne Duality and Electromagnetic Duality
6. Babinet Duality
6.1. Babinet’s Principle for Electromagnetic Waves
- :
- :
6.2. Self-Dual Systems in Terms of Babinet Duality
6.3. Babinet Duality in Transmission-Line Models
7. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A. General Inner-Orientation Representation for Outer Orientation
Appendix B. Babinet’s Principle for Transmission and Reflection Coefficients
Appendix C. Duality for Input Impedances of Antennas
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Circuit | Dual Circuit |
---|---|
Current distribution I | Voltage distribution |
Voltage distribution V | Current distribution |
Face current F | Potential |
Potential | Face current |
Voltage source | Current source |
Current source | Voltage source |
Resistance R | Conductance |
Conductance G | Resistance |
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Nakata, Y.; Urade, Y.; Nakanishi, T. Geometric Structure behind Duality and Manifestation of Self-Duality from Electrical Circuits to Metamaterials. Symmetry 2019, 11, 1336. https://0-doi-org.brum.beds.ac.uk/10.3390/sym11111336
Nakata Y, Urade Y, Nakanishi T. Geometric Structure behind Duality and Manifestation of Self-Duality from Electrical Circuits to Metamaterials. Symmetry. 2019; 11(11):1336. https://0-doi-org.brum.beds.ac.uk/10.3390/sym11111336
Chicago/Turabian StyleNakata, Yosuke, Yoshiro Urade, and Toshihiro Nakanishi. 2019. "Geometric Structure behind Duality and Manifestation of Self-Duality from Electrical Circuits to Metamaterials" Symmetry 11, no. 11: 1336. https://0-doi-org.brum.beds.ac.uk/10.3390/sym11111336