设计和分析了应用于W波段带状注行波管的E面多孔输入输出耦合器和H面多孔输入输出耦合器。研究表明，采用多孔耦合，不仅可以实现电磁场与电子注的汇聚和分离，还可以实现极宽工作带宽。HFSS仿真分析结果表明：E面多孔定向耦合器1 dB相对带宽达43 GHz，且隔离度优于20 dB的相对带宽达到40 GHz；H面定向耦合器在E面耦合器的10个耦合孔数的基础上，通过增加2个耦合孔数，1 dB相对带宽提升到30 GHz，且隔离度大于15 dB的相对带宽达到32 GHz。两种新型耦合器在极宽的工作带宽内实现低反射、高隔离的性能。与E面耦合器相比，H面耦合器易于加工和利于与周期永久磁体的封装集成。

Two input/output couplers consisting of multiple apertures in E plane and H plane are designed and analyzed for a W-band broadband sheet beam traveling wave tube (TWT). Multi-apertures are adopted in the couplers to separate the electromagnetic field from the beam and extend the operating bandwidth. Simulation results optimized by HFSS indicate that the E-plane coupler can achieve a 1 dB transmission bandwidth of 45.3% and a -20 dB isolation bandwidth of 34.7% respectively. Similar results are obtained by adding two more apertures for the H-plane coupler, specifically, the 1 dB relative bandwidth and the port isolation under -15 dB can get improved to 45.3% and 30.6% respectively. Both novel couplers can achieve high isolation and low reflection in extreme broad bandwidth. In comparison with the E plane coupler, the H plane structure is easy to fabricate, cool and integrate with periodic permanent magnet in compact dimensions.