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- Title
Dual-band composite right/left-handed metamaterial lines with dynamically controllable nonreciprocal phase shift proportional to operating frequency.
- Authors
Kaneda, Takumi; Ueda, Tetsuya
- Abstract
The phase constants for the periodic structures correspond to the pair of variables HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi> </mi><mo>+</mo></msub></math> ht and HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi> </mi><mo>-</mo></msub></math> ht in Figure 1. In what follows, we call the quantity HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal"> </mi><mi> </mi></math> ht "phase-shifting nonreciprocity". Under the assumption that the characteristic impedances of the nonreciprocal transmission line sections show almost identical characteristics with HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>Z</mi><mtext>p</mtext></msub><mo>=</mo><msub><mi>Z</mi><mtext>n</mtext></msub><mo>=</mo><msub><mi>Z</mi><mn>0</mn></msub><mo>=</mo><mn>1</mn><mo>/</mo><msub><mi>Y</mi><mn>0</mn></msub></math> ht , we have general dispersion curves with significantly large bandgaps, as shown in Figure 3b. In the unit cell, two identical nonreciprocal transmission line sections having wavevectors HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi> </mi><mtext>p</mtext></msub></math> ht and HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi> </mi><mtext>n</mtext></msub></math> ht and characteristic impedances HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>Z</mi><mtext>p</mtext></msub></math> ht and HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>Z</mi><mtext>n</mtext></msub></math> ht in the positive and negative I y i directions have also been introduced.
- Subjects
METAMATERIALS; BEAM steering; LEAKY-wave antennas; UNIT cell; TRANSMISSION line theory; MICROWAVE transmission lines; NEGATIVE refraction
- Publication
Nanophotonics (21928606), 2022, Vol 11, Issue 9, p2097
- ISSN
2192-8606
- Publication type
Article
- DOI
10.1515/nanoph-2021-0783