Study on small isolator for 4th generation wireless communication system

研制了三种工作在铁磁共振点附近的隔离器：底部安装型微带隔离器、顶部安装型微带隔离器和顶部安装型共面波导隔离器。有限元电磁模拟表明，该隔离器在450 MHz~4.6 GHz频率范围内可调，具有良好的非互易传输特性。用试制的隔离器验证了隔离器的非互易传输特性。给出了隔振器的设计方案。

Three types of isolator operating in the vicinity of ferromagnetic resonance point : bottom mount type microstrip isolator, top mount type microstrip isolator and top mount type coplanar waveguide isolator, were developed. FEM electromagnetic simulation showed that the isolators are tunable in the frequency region from 450 MHz to 4. 6GHz, and excellent nonreciprocal transmission characteristics are obtainable. Nonreciprocal transmission characteristics of the isolator were actually confirmed using the isolator fabricated in trial. Design scheme of the isolator was also derived.