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Article

Twist and Glide Symmetries for Helix Antenna Design and Miniaturization

1
Department of Languages and Computer Science, Universidad de Málaga, 29071 Málaga, Spain
2
Department of Signal Theory, Telematics and Communications, Universidad de Granada, 18071 Granada, Spain
3
Department of Electromagnetic Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
*
Author to whom correspondence should be addressed.
Symmetry 2019, 11(3), 349; https://doi.org/10.3390/sym11030349
Received: 26 January 2019 / Revised: 17 February 2019 / Accepted: 4 March 2019 / Published: 8 March 2019
Here we propose the use of twist and glide symmetries to increase the equivalent refractive index in a helical guiding structure. Twist- and glide-symmetrical distributions are created with corrugations placed at both sides of a helical strip. Combined twist-and glide-symmetrical helical unit cells are studied in terms of their constituent parameters. The increase of the propagation constant is mainly controlled by the length of the corrugations. In our proposed helix antenna, twist and glide symmetry cells are used to reduce significantly the operational frequency compared with conventional helix antenna. Equivalently, for a given frequency of operation, the dimensions of helix are reduced with the use of higher symmetries. The theoretical results obtained for our proposed helical structure based on higher symmetries show a reduction of 42.2% in the antenna size maintaining a similar antenna performance when compared to conventional helix antennas. View Full-Text
Keywords: higher symmetries; periodic structures; glide symmetry; twist symmetry; dispersion diagram; microwave printed circuits; helix antennas higher symmetries; periodic structures; glide symmetry; twist symmetry; dispersion diagram; microwave printed circuits; helix antennas
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MDPI and ACS Style

Palomares-Caballero, Á.; Padilla, P.; Alex-Amor, A.; Valenzuela-Valdés, J.; Quevedo-Teruel, O. Twist and Glide Symmetries for Helix Antenna Design and Miniaturization. Symmetry 2019, 11, 349. https://doi.org/10.3390/sym11030349

AMA Style

Palomares-Caballero Á, Padilla P, Alex-Amor A, Valenzuela-Valdés J, Quevedo-Teruel O. Twist and Glide Symmetries for Helix Antenna Design and Miniaturization. Symmetry. 2019; 11(3):349. https://doi.org/10.3390/sym11030349

Chicago/Turabian Style

Palomares-Caballero, Ángel, Pablo Padilla, Antonio Alex-Amor, Juan Valenzuela-Valdés, and Oscar Quevedo-Teruel. 2019. "Twist and Glide Symmetries for Helix Antenna Design and Miniaturization" Symmetry 11, no. 3: 349. https://doi.org/10.3390/sym11030349

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