Twist and Glide Symmetries for Helix Antenna Design and Miniaturization

Symmetry

Oscar Quevedo-Teruel¹  Antonio Alex-Amor²  Ángel Palomares-Caballero²  Pablo Padilla³  Juan Valenzuela-Valdés³ 

[1] Department of Electromagnetic Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;Department of Languages and Computer Science, Universidad de Málaga, 29071 Málaga, Spain;Department of Signal Theory, Telematics and Communications, Universidad de Granada, 18071 Granada, Spain;

关键词: higher symmetries;    periodic structures;    glide symmetry;    twist symmetry;    dispersion diagram;    microwave printed circuits;    helix antennas;   

DOI  :  10.3390/sym11030349

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown