The development of polymer‐based absorbers in millimeter‐wave frequency range has triggered a surge of interest due to the ever‐growing demands of 5G communication applications. Herein, a systematic investigation on a novel biphase composite, i.e., BaNb_0.6Fe_11.4O₁₉ (BNFO)/epoxy, is presented. BNFO is the only filler phase that can generate dielectric loss and magnetic loss simultaneously, and epoxy is used as matrix phase for its advantages as a widely used electronic packaging material. The millimeter‐wave broadband absorption properties of the composite and related mechanisms are investigated both experimentally and theoretically. When the BNFO content is higher than 60 wt%, a millimeter‐wave broadband absorption performance is observed with a decreased matching thickness and a wider effective bandwidth covering the entire R band. The maximum reflection loss of the composite can achieve −28.74 dB at 31.43 GHz and −44.36 dB at 27.18 GHz with a matching thickness of only 0.98 and 0.97 mm when the BNFO contents are 60 and 75 wt%, respectively. The comprehensive advantages of the composite, including millimeter‐wave broadband absorption properties, facile manufacturing processes, small matching thickness, and good compatibility with current electronic packaging materials, facilitate it to be utilized in next‐generation electronic devices.

中文翻译：

---

简便方法具有优异的毫米波宽带吸收特性的环氧树脂基陶瓷聚合物复合材料

由于5G通信应用的需求不断增长，毫米波频率范围内基于聚合物的吸收体的发展引起了人们的关注。本文对新型双相复合材料BaNb _0.6 Fe _11.4 O _19进行了系统研究。（BNFO）/环氧树脂。BNFO是唯一可以同时产生介电损耗和磁损耗的填料相，而环氧树脂由于其作为广泛使用的电子包装材料的优势而被用作基质相。对复合材料的毫米波宽带吸收特性及相关机理进行了实验和理论研究。当BNFO含量高于60 wt％时，观察到毫米波宽带吸收性能，匹配厚度减小，有效带宽覆盖整个R波段。当BNFO含量分别为60和75 wt％时，复合材料的最大反射损耗在31.43 GHz时可达到-28.74 dB，在27.18 GHz时可达到-44.36 dB，匹配厚度分别为0.98和0.97 mm。复合材料的综合优势，