Abstract
The resonant metalens consisting of metal-wire resonators with equally finite length can break the diffraction barrier well suited for super-resolution imaging. In this study, a basic combination constructed by two metal-wire resonators with different lengths is proposed, and its resonant characteristics is analyzed using the method of moments (MoM). Based on the time reversal (TR) technique, this kind of combination can be applied to a sub-wavelength two-element antenna array with a 1/40-wavelength interval to make the elements work simultaneously with little interference in the frequency band of 1.0-1.5 GHz and 1.5-2.0 GHz, respectively. The simulations and experiments show that analysis of MoM and the application of the resonators can be used to design multi-frequency sub-wavelength antenna arrays efficiently. This general design method is convenient and can be used for many applications, such as weakening jamming effectiveness in communication systems, and sub-wavelength imaging in a broad frequency band.
Highlights
How to realize a higher data transfer rates of wireless communications is drawing increasing attention nowadays
A basic combination constructed by two metal-wire resonators with different lengths is proposed, and its resonant characteristics is analyzed using the method of moments (MoM)
Based on the time reversal (TR) technique, this kind of combination can be applied to a sub-wavelength two-element antenna array with a 1/40-wavelength interval to make the elements work simultaneously with little interference in the frequency band of 1.0-1.5 GHz and 1.5-2.0 GHz, respectively
Summary
In a wider bandwidth if the metal-wire resonators are with different lengths. In present literature, the transmission of the signal beyond the diffraction limit can only be achieved at one single antenna (whose signal peak is at least 50% larger than those received by other receiving antennas) element during a communication process.[4,5,6] a general design method which allows all the sub-wavelength array elements to work simultaneously with little interference is desirable. A combination consisting of two metal-wire resonators with different lengths is analysed by the method of moments firstly. According to the analysis results and conclusions, a sub-wavelength two-element array is proposed. The two elements of the array can work simultaneously in different frequency bands even if the element spacing is 1/40 wavelength
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