Siragam Srilali, Dubey R S, Pappula Lakshman, Satheesh Babu G
Department of Electronics & Communication Engineering, Swarnandhra College of Engineering and Technology, Seetharamapuram, Narsapur, A.P., India.
Department of ECE, KoneruLakshmaiah Education Foundation, Greenfields, Vaddeswaram, Guntur, A.P., India.
Sci Rep. 2022 Mar 10;12(1):3929. doi: 10.1038/s41598-022-07899-6.
Zinc aluminate (ZnAlO) is a well-recognized ceramic demanded in several microwave applications. Further, the addition of dielectric materials in ZnAlO improved its dielectric properties, which is promising for the realization of a microstrip patch antenna. This article reports the investigation of ZnAlOTiO (ZAT) dielectric ceramic nanoparticles synthesized by the sol-gel process. The X-ray diffraction analysis revealed the crystalline nature of the prepared nanoparticles, with a tetragonal structure of anatase-, and rutile-TiO phases coexisting with the cubic phase of ZnAlO. The estimated crystallite size of the dielectric ceramic is 13.3 nm. Transmission electron microscopy (TEM) micrographs demonstrated the spherical grains with their mean diameter of 14.75 nm, whereas the selected-area electron diffraction (SAED) pattern endorsed the crystallinity of the sample. Raman measurement revealed the vibrational modes in accordance with the TiO and ZnAlO compounds. The dielectric properties of the ZAT sample showed the dielectric permittivity in the range of 22.12-21.63, with its minimum loss from 0.056 to 0.041. Finally, a prototype microstrip antenna was fabricated using the prepared nanoparticles, which demonstrated a return loss of - 30.72 dB at the resonant frequency of 4.85 GHz with its bandwidth of 830 MHz.
铝酸锌（ZnAlO）是一种在多种微波应用中广为人知的陶瓷材料。此外，在ZnAlO中添加介电材料可改善其介电性能，这对于实现微带贴片天线很有前景。本文报道了通过溶胶 - 凝胶法合成的ZnAlOTiO（ZAT）介电陶瓷纳米颗粒的研究。X射线衍射分析揭示了所制备纳米颗粒的晶体性质，其具有锐钛矿型和金红石型TiO相的四方结构与ZnAlO的立方相共存。介电陶瓷的估计微晶尺寸为13.3纳米。透射电子显微镜（TEM）显微照片显示了平均直径为14.75纳米的球形颗粒，而选区电子衍射（SAED）图案证实了样品的结晶度。拉曼测量揭示了与TiO和ZnAlO化合物一致的振动模式。ZAT样品的介电性能显示介电常数在22.12 - 21.63范围内，其最小损耗从0.056降至0.041。最后，使用所制备的纳米颗粒制作了一个微带天线原型，该原型在4.85 GHz的谐振频率下具有 - 30.72 dB的回波损耗，带宽为830 MHz。
