A novel multi-functional electromagnetic (EM) device named rotary-concentrator is designed based on transfor-mation optics theory. For its ability to manipulate the EM wave in a special manner, it can rotate the propagation direction of the EM field in the core region to a fixed angle, as well as concentrate the EM energy into the core re-gion simultaneously. For the proposed three equivalent configurations of the rotary-concentrator, the corresponding constitutive parameter expressions are derived respectively, and the full-wave simulations using the finite element soft-ware are also carried out. The simulated results validate the derived constitutive parameter expressions. For the three different kinds of configurations, the first two kinds consist of three layers of media, and the last one is simplified to a two-layer configuration. For a given arbitrary rotating angle and an energy concentration ratio, the three configurations can perform propagation direction rotating and energy concentrating in equivalent effect. These results contribute to further understanding of the mechanism of rotator and concentrator, and provide a fuller theoretical basis for the design of multi-functional devices. The proposed rotary-concentrator has potential applications in the design of high efficient receiving antennas and special circuit package interconnecting devices.%基于变换光学理论设计了一种新型的多功能电磁器件-旋转集中器。它以特殊的方式引导电磁波使其传播方向在器件核心区发生指定角度的旋转，并同时实现电磁场能量向该核心区的集中。针对提出的三种等效的旋转集中器结构，分别推导了相应的本构参数表达式，并利用有限元软件对三种结构分别进行了全波仿真。仿真结果验证了本构参数表达式的正确性。这三种不同的结构中，前两种结构由三层介质构成，后一种简化为两层介质。对于给定的任意旋转角度和能量集中率，三种结构可以使电磁场发生等效的传播方向旋转和能量集中两种效果。这些结果有助于对旋转器和集中器机理的进一步理解，并为复合功能器件的设计奠定了更充分的理论基础。本文提出的旋转集中器在设计高效率接收天线和特殊电路封装互联器件等方面都有潜在的应用前景。
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