A miniatured helical antenna based on the sinusoidal folding structure with exponential spacing.
Rev Sci Instrum
; 93(8): 084702, 2022 Aug 01.
Article
en En
| MEDLINE
| ID: mdl-36050060
ABSTRACT
An exponential spacing and sinusoidal folded helical (ESSFH) antenna backed with a cavity is developed in this paper. Compared with the conventional helical (CH) antenna, the proposed antenna not only has smaller dimension but also exhibits a wider working bandwidth, a higher gain, and a better circular polarization (CP) characteristic. To reduce the dimension of the helical antenna, a sinusoidal structure is adopted along the circumference of the helix. However, it deteriorates the CP characteristic of the antenna. Therefore, the structure of the exponential helix spacing is introduced into the sinusoidal folded helical (SFH) antenna. Then, to further improve the gain of the ESSFH antenna, its ground plane is replaced by an optimized cavity. Compared with the CH antenna, the helix diameter of the ESSFH antenna Dλ is reduced from 0.32 to 0.23, and its volume is reduced to 53%. The ESSFH antenna backed with a cavity has an impedance bandwidth of 0.43-1.02 GHz, which is much wider than 0.48-0.60 GHz of the CH antenna. Moreover, it has an axial ratio of 1.77, while the axial ratio of the CH antenna is 2.61. In addition, its effective potential gain is 0.56, which is 22% higher than that of the CH antenna.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Tecnología Inalámbrica
Idioma:
En
Revista:
Rev Sci Instrum
Año:
2022
Tipo del documento:
Article
País de afiliación:
China