Helix antenna array based on higher symmetries for antenna miniaturization and mutual coupling reduction

Palomares‐Caballero, Ángel; Alex‐Amor, Antonio; Valenzuela-Valdes, Juan Fco; Padilla, Pablo

doi:10.1109/apwc.2019.8870497

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…However, for handsets integrated with intercom and satellite communication modules, the total antenna size may be too large to be portable if the two antennas are designed independently. On the other hand, the independent design may also cause strong mutual coupling if the two antennas are not arranged reasonably [8][9][10]. To solve these problems, the integrated and miniaturized design of the QHA and the monopole antenna is required.…”

Section: Introductionmentioning

confidence: 99%

Design of Miniaturized Dual-Mode Antenna for Handset Terminal Communication

Zhang

Shi

Zhang

et al. 2023

International Journal of RF and Microwave Computer-Aided Engine

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This paper presents a miniaturized dual-mode handset antenna design. A quadrifilar helix antenna (QHA) is utilized to work at higher band (1980-2010 MHz and 2170-2200 MHz) with circular polarization. By cutting off a circular slot on the outer conductor of the QHA feedline and introducing four quarter-wavelength short-circuited stubs, the QHA radiator and its feedline can also work as a monopole antenna at lower band (440-560 MHz) with linear polarization. With this radiator-sharing technique, the dual-mode characteristics can be achieved utilizing only a QHA; therefore, the antenna dimension can be reduced remarkably since it is unnecessary to design an additional monopole antenna. Moreover, the short-circuited stubs are designed with stripline and integrated with the one-to-four power divider and phase shifter for further miniaturization. The measured S11 is less than -8 dB. The typical gain is higher than 0.5 dBi at lower band and 2.5 dBi at higher band. The AR of the QHA is better than 1.3 dB, and the head SAR values are much lower than the international standard at both lower and higher bands. The proposed miniaturized dual-mode antenna can be applied to portable handsets to realize the intercom and satellite communications.

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Section: Introductionmentioning

confidence: 99%

Design of Miniaturized Dual-Mode Antenna for Handset Terminal Communication

Zhang

Shi

Zhang

et al. 2023

International Journal of RF and Microwave Computer-Aided Engine

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“…For example, introducing glide and twist symmetries in periodic structures can increase their equivalent refractive index [18], [19]. This feature has been used for antenna miniaturization [20], mutual coupling reduction [21] or to produce a compact and low-loss phase shifter at millimeter waves [22]. Furthermore, with the use of higher symmetries, the stopband between the first and the second modes of conventional periodic structures is suppressed [23]- [25] and the frequency dispersion of the first propagating modes is reduced [18], [26]- [28].…”

mentioning

confidence: 99%

Glide-Symmetric Metallic Structures With Elliptical Holes for Lens Compression

Alex‐Amor

Ghasemifard

Valerio

et al. 2020

IEEE Trans. Microwave Theory Techn.

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In this paper, we study the wave propagation in a metallic parallel-plate structure with glide-symmetric elliptical holes. To perform this study, we derived a mode-matching technique based on the generalized Floquet theorem for glidesymmetric structures. This mode-matching technique benefits from a lower computational cost since it takes advantage of the glide symmetry in the structure. It also provides physical insight on the specific properties of Floquet modes propagating in these specific structures. With our analysis, we demonstrate that glide-symmetric structures with periodic elliptical holes exhibit an anisotropic refractive index over a wide range of frequencies. The equivalent refractive index can be controlled by tuning the dimensions of the holes. Finally, by combining the anisotropy related to the elliptical holes and transformation optics, a Maxwell fish-eye lens with a 33.33% size compression is designed. This lens operates in a wideband frequency range from 2.5 GHz to 10 GHz.

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