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面向5G小型化环行器的低磁矩高介Bi-YIG旋磁铁氧体设计与实现

赵建伟1,2, 程泽来3, 梁吉3, 邱委华2, 苏桦3, 李化义1   

  1. 1.哈尔滨工业大学 卫星技术研究所,哈尔滨 150080;
    2.山东航天电子技术研究所,烟台264670;
    3.电子科技大学 电子科学与工程学院,成都 611731
  • 收稿日期:2026-01-09 修回日期:2026-02-15
  • 通讯作者: 李化义, 教授. E-mail: lihuayi@hit.edu.cn; 苏 桦, 教授, E-mail: uestcsh77@163.com
  • 作者简介:赵建伟(1983-), 男, 硕士研究生. E-mail: 21B918143@stu.hit.edu.cn
  • 基金资助:
    四川省科技厅项目(2025ZHCG0019)

Design and Implementation of Low-moment High-dielectric Bi-YIG Gyromagnetic Ferrites for 5G Miniaturized Circulators

ZHAO Jianwei1,2, CHENG Zelai3, LIANG Ji3, QIU Weihua2, SU Hua3, LI Huayi1   

  1. 1. Research Center of Satellite Technology, Harbin Institute of Technology, Harbin 150080, China;
    2. Shandong Astronautics Electronic Technology Institute, Yantai 264670, China;
    3. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
  • Received:2026-01-09 Revised:2026-02-15
  • Contact: LI Huayi, male, professor. E-mail: lihuayi@hit.edu.cn; SU Hua, professor. E-mail: uestcsh77@163.com
  • About author:ZHAO Jianwei (1983-), male, Master candidate. E-mail: 21B918143@stu.hit.edu.cn
  • Supported by:
    Sichuan Science and Technology Program (2025ZHCG0019)

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摘要： 随着5G通信对高集成度器件的需求日益增长,开发兼具高介电常数与低饱和磁化强度的旋磁铁氧体成为研究关键。本研究旨在通过多离子协同取代策略,设计并制备一种适用于3.0~3.6 GHz频段的石榴石铁氧体。采用固相反应法制备了Bi1.4Gd0.2Ca1.4Zr0.2AlnV0.6Fe4.2-nO12(n=0~0.20)系列样品,系统研究了Al3+取代对其微观结构、磁性能与介电性能的影响。所有样品均保持纯石榴石相,无次相。微结构致密、均匀,粒界清晰。结果表明,当n=0.10时,材料获得最佳综合性能：饱和磁化强度(Saturation magnetization, 4πMs)降至774 G,铁磁共振线宽(Ferromagnetic resonance linewidth, ΔH)优化至83 Oe(1 Oe = 1000/(4π) A/m≈79.577 A/m),介电常数(Dielectric constant, εr)达26.31,介电损耗(Dielectric loss, tanδε)为8.49×10-4。基于此材料研制的双Y结环行器在3.0~3.6 GHz频段内插入损耗为-0.27- -0.31 dB,回波损耗与隔离度均优于-20 dB,且在-40 ℃至110 ℃宽温范围内性能稳定。Al3+取代通过稀释磁性离子与弱化磁晶各向异性,协同降低了4πMs与ΔH。本工作为5G小型化环行器提供了一种高性能的铁氧体材料解决方案。

关键词: 旋磁铁氧体, 环行器, Bi-YIG, 低饱和磁化强度

Abstract: With the increasing demand for highly integrated devices in 5G communication, the development of gyromagnetic ferrites combining high dielectric constant and low saturation magnetization has become a research focus. This study aims to design and prepare a garnet ferrite suitable for the 3-3.6 GHz band through a multi-ion co-substitution strategy. A series of Bi1.4Gd0.2Ca1.4Zr0.2AlnV0.6Fe4.2-nO12 (n = 0-0.20) samples were synthesized by the solid-state reaction method. The effects of Al3+ substitution on the microstructure, magnetic properties, and dielectric properties were systematically investigated. All samples maintain a pure garnet phase without secondary phases. Dense and uniform microstructures with clear grain boundaries are observed. The results show that the optimal comprehensive performance is achieved at n = 0.10: the saturation magnetization (4πMs) is significantly reduced to 774 G, the ferromagnetic resonance linewidth (ΔH) is optimized to 83 Oe(1 Oe = 1000/(4π) A/m≈79.577 A/m), the dielectric constant (εr) reaches 26.31, and the dielectric loss (tanδε) is as low as 8.49 × 10-4. A dual-Y-junction circulator fabricated based on this optimized material exhibits excellent microwave performance within the 3-3.6 GHz band, with an insertion loss of -0.27 to -0.31 dB, return loss and isolation both better than 20 dB. Moreover, the device demonstrates stable performance over a wide temperature range from -40 ℃ to 110 ℃, indicating its reliability for practical engineering applications. The Al3+ substitution synergistically reduces both 4πMs and ΔH by diluting magnetic ions and weakening magnetocrystalline anisotropy. This work provides a high-performance ferrite material solution for miniaturized 5G circulators and contributes to the advancement of integrated microwave devices for next-generation communication systems.

Key words: gyromagnetic ferrite, circulator, Bi-YIG, low saturation magnetization

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