In the present article, silver cone antenna and its arrays are designed according to the requirement of wide bandwidth terahertz irradiation property. Coordinate transformation method is employed to analyze the solution process of the integrate equation of the irradiated electromagnetic field. And CST microwave studio software is employed to simulate the terahertz irradiation properties of Ag cone antenna arrays. Theoretical analysis and simulation results both manifest that the single Ag cone antenna with micrometer scale size can irradiate a wide bandwidth THz wave with the gain of 22.7dBi, while its corresponding antenna arrays with proper configuration can further improve the radiation pattern and enhance the gain to 42.5dBi. The theoretical analysis and CST simulation results will be useful for the guidance of experimental investigation of terahertz irradiation sources.
The phase assemblage and dielectric properties of (Ca0.5+x Sr0.5-x)[(Al0.5Nb0.5)0.5Ti0.5]O3O3 ceramics (abbreviated as
CSANT hereafter) in Terahertz waveband were investigated. The CSANT complex perovskite was unstable at
Ca2+-rich composition, a secondary phase were easily segregated in x ≥-0.05 region. The main perovskite phase
CSANT crystallized in Fm3m cubic symmetry in the composition range of x≤-0.1, however, it transited to Pbnm
orthorhombic space group after x=-0.1 due to the antiphase tilting of oxygen octahedra. As x further increased to
x=0.2, or the tolerance factor decreased to 0.9785, A-site Ca2+/Sr 2+ cations antiparallel displacements also appeared.
The dielectric absorption property of CSANT ceramics in THz frequency range was investigated using
time-domain transmission spectrum technology and was correlated to their microstructures. The compositional
dependence of the power absorption property of CSANT ceramics exhibited a monotonous variation in 0.1~2.5THz
frequency. A lowest THz power absorption ceramic could be obtained in CSANT compounds at x=0.3 when
sintered at 1500°C for 4hrs.
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