Abstract
A metamaterial aperture antenna (MAA) that generates frequency-diverse radiation field patterns has been introduced in the context of microwave wave imaging to perform compressive image reconstruction. This paper presents a new metamateriapl aperture design, which includes two kinds of metamaterial elements with random distribution. One is a high-Q resonant element whose resonant frequency is agile, and the other one is a low-Q element that has a high radiation efficiency across frequency band. Numerical simulations and measurements show that the radiation efficiency of up to 60% can be achieved for the MAA and the far-field patterns owns good orthogonality, when using the complementary electric-field-coupled (CELC) element and the complementary Jerusalem cross (CJC) element with a random distribution ratio of 4 to 1, which could be effectively used to reconstruct the target scattering scene.
Highlights
To obtain a relatively high radiation efficiency and a low μg, the ratio of complementary Jerusalem cross (CJC) elements must be selected as 20% since its high radiation efficiency and a low μg, the ratio of CJC elements must be selected as 20% since its radiation efficiency has been improved to around 60% and its capability of imaging reconstruction radiation efficiency has been improved to around 60% and its capability of imaging reconstruction approaches that of a metamaterial aperture without CJC elements
One element has a high Q-value with anmeasured agile frequency response, and the image other with random distribution was proposed, designed, and to perform compressive reconstruction
One element has a high Q-value with an agile frequency response, and the other element has a relatively low Q-factor and has a high radiation efficiency
Summary
Scenes can be perfectly reconstructed with significantly fewer measurement modes than the space bandwidth product (SBP) [1,2,3] These measurement modes are composed of radiated field patterns of the metamaterial aperture antenna (MAA) at different frequencies. To obtain a metamaterial aperture that generates the frequency-agile far-field patterns that are as orthogonal as possible, elements distributed on the aperture must have a strong resonance with a high Q-value. GHz procedure,and andtotoshow show that measured far-field patterns the frequency band to could becould used to reconstruct the target scene with scatterers. By this frequency-agile kind of element on patterns the MAA, fieldcan patterns with good result, the target can be As perfectly reconstructed by can utilizing a simple metamaterial orthogonality canscene be obtained.
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