[PDF]    https://doi.org/10.3952/physics.v62i3.4799

Open access article / Atviros prieigos straipsnis
Lith. J. Phys. 62, 161–170 (2022),

MICROWAVE ELECTROMAGNETIC SHIELDING EFFECTIVENESS OF ZnNb2O6-CHOPPED STRANDS COMPOSITES FOR RADAR AND WIDEBAND (6.5–18 GHz),  APPLICATIONS
Ethem İlhan Şahin
 Advanced Technology Research and Application Center, Adana Alparslan Türkeş Science and Technology University, Adana 01250, Turkey
Email: shnethem@gmail.com

Received 14 June 2022; revised 9 September 2022; accepted 12 September 2022

In this study, the traditional mixed oxide process was used to create ZnNb2O6-chopped strands composites. The single phase compound with the chemical formula ZnNb2O6 was generated after sintering at 1100°C for 4 h. For the structural investigation, various quantities of ZnNb2O6-chopped strands were generated. X-ray diffraction (XRD), scanning electron microscopy (SEM),  and energy-dispersive X-ray spectroscopy (EDS),  were carried out for the structural analysis, which indicated that the second phase did not form in ZnNb2O6. Additionally, the ZnNb2O6-strands composites were manufactured by hot pressing using the compositions of ZnNb2O6-chopped strands in various proportions and epoxy. The ZnNb2O6-chopped strands compound formed in various weights, and epoxy resin were used to fabricate microwave shielding effectiveness composites. Utilizing a network analyzer, the microwave shielding effect of ZnNb2O6-chopped strands composites was investigated in a range of 6.5–18 GHz. At a thickness of 1.5 mm, a minimum of –51.32 dB shielding effectiveness value was achieved at 6.75 GHz. The ZnNb2O6-chopped strands compounds were produced as composite and their features were characterized for shielding effectivacy. The content of components in the samples may be managed for the larger and needed frequency bands to change the microwave shielding performance.
Keywords:microwave shielding, ZnNb2O6, mixed oxide, chopped strands, matrix composites

ZnNb2O6 SUSMULKINTŲ GIJŲ KOMPOZITŲ ELEKTROMAGNETINIO EKRANAVIMO EFEKTYVUMAS TAIKANT JUOS RADARUOSE IR PLATAUS (6,5–18 GHz),  MIKROBANGŲ RUOŽO PRIETAISUOSE
Ethem İlhan Şahin

Adanos Alparslan Türkeş mokslo ir technologijų universiteto Pažangių technologijų tyrimų ir taikymo centras, Adana, Turkija
Šiame tyrime tradicinis mišraus oksido procesas buvo naudojamas ZnNb2O6 susmulkintų gijų kompozitams sukurti. Vienfazis junginys, kurio cheminė formulė yra ZnNb2O6, buvo sukurtas 4 valandas sukepinus jį 1100 °C temperatūroje. Struktūriniam tyrimui buvo sukurti įvairūs ZnNb2O6 susmulkintų gijų kiekiai. Struktūrinei analizei buvo atlikta rentgeno spindulių difrakcija (XRD), skenuojamoji elektronų mikroskopija (SEM),  ir energijos dispersinė rentgeno spektroskopija (EDS), ir jos parodė, kad antroji ZnNb2O6 fazė nesusidarė. Be to, ZnNb2O6 susmulkintų gijų kompozitai buvo pagaminti karšto presavimo būdu, naudojant įvairių proporcijų ZnNb2O6 susmulkintų gijų kompozicijas ir epoksidą.
ZnNb2O6 susmulkintų gijų junginys įvairiais svorio santykiais ir epoksidinė derva buvo naudojami mikrobangų ekranavimo efektyvumo kompozitams gaminti. Naudojant tinklo analizatorių tirtas ZnNb2O6 susmulkintų gijų kompozitų mikrobangų ekranavimo efektyvumas 6,5–18 GHz diapazone. Kai storis yra 1,5 mm, pasiekta didžiausia (pagal modulį),  –51,32 dB ekranavimo efektyvumo vertė, esant 6,75 GHz. ZnNb2O6 susmulkintų gijų junginiai buvo gaminami kaip kompozitai, o jų savybės apibūdintos siekiant užtikrinti ekranavimo kokybę. Komponentų proporcijos pavyzdžiuose gali būti parenkamos pritaikant juos tam tikriems dažniams ar reikalingoms dažnių juostoms, siekiant reikalingo mikrobangų ekranavimo.


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