## 4 Conclusions  
In this work, fiber-reinforced composite radome material was prepared, for communication applications, to withstand high working temperature, mechanical, and thermal stability compared to pure epoxy composites. Our research delved into the impact of embedding quartz fibers and determining their optimal quantity required to achieve enhanced electrical, mechanical, and thermal performance in epoxy composites. Quartz fiber/epoxy (EQ) composites were prepared through hand lay-up, compression molding process followed by thermal curing. FTIR analysis indicated the presence of organic and inorganic networks (-OH, C=O, C-N-C, C-H, and Si-O-Si) while SEM morphology showed fair fiber-resin adhesion, interfacial bonding, and compact structure of EQ composites.  
Compared to the pure epoxy resin embedding a small fraction (0.30) of quartz fibers in epoxy, decreased the dielectric constant by 22% (4.10 to 3.21) and the dielectric loss factor by 40% (0.035 to 0.021). This addition of quartz fibers substantially reduced the polarizability of polarized molecules by decreasing their dielectric constant and transmission loss which is advantageous in radome applications. Embedding quartz fiber up to 30% (wt./wt.) significantly improved the mechanical properties with a 49.72% increase in tensile strength and 52.01% rise in bending strength. Beyond this fiber loading, tensile strength was increased but the rise in the bending strength was not exceptional. Moreover, lower weight losses (65%, 44.3%, 39.5%, 36.7%, and 29%) refers to the higher thermal stability of EQ composites when compared to the pure epoxy composite. The enhanced electrical, mechanical, and thermal properties can be attributed to the inclusion of quartz fibers, good interfacial properties, fair adhesion compatibility, and a compact and balanced composite structure. In conclusion, adding a small quantity (0.30) of quartz fibers into an epoxy resin yields excellent dielectric characteristics with improved mechanical and thermal properties. Compared to pure epoxy resin composites, quartz fiber/epoxy composites exhibit substantial potential for applications in radomes.  
Conceptualization, S.H.I.J. and M.A.K.; Data curation, I.H.G.; Formal analysis, I.H. and M.A.K.; Funding acquisition, S.A. and D.-W.J.; Investigation, M.I.F, S.H.I.J. and D.-W.J.; Methodology, I.H. and S.A.; Project administration, M.I.F. and D.-W.J.; Resources, M.I.F. Software, S.A.; Supervision, I.H.G., S.H.I.J. and M.A.K.; Validation, I.H.G.; Writing--original draft, I.H. and  
Figure 8: TGA of epoxy and quartz fiber/epoxy composites.  
M.A.K. Writing--review & editing, M.I.F. All authors have read and agreed to the published version of the manuscript.
* [1]**Funding:** This research was funded by the Brain Pool program of the Ministry of Science and by ICT through the National Research Foundation of Korea (RS-2023-00218940). This work was supported by the Deanship of Scientific Research, Vice Presidency for Graduate Studies and Scientific Research, King Faisal University, Saudi Arabia (Grant No. 4467).
* [2]**Institutional Review Board Statement:** Not applicable.
* [3]**Data Availability Statement:** Further relevant data can be provided on request.
* [4]**Conflicts of Interest:** The authors declare no conflict of interest.