DESIGN OF WIDEBAND QUAD-RIDGED WAVEGUIDE ORTHOMODE TRANSDUCER AT L-BAND
DESIGN OF WIDEBAND QUAD-RIDGED WAVEGUIDE ORTHOMODE TRANSDUCER AT L-BAND
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DOI：
10.2528/pierc17010802
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发表时间：
2017
影响因子：
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通讯作者：
Jin Fan;Yihua Yan;C. Jin;D. Zhan;Jirun Luo
中科院分区：
文献类型：
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作者：
Jin Fan;Yihua Yan;C. Jin;D. Zhan;Jirun Luo
本文介绍了一种用于500米口径球面射电望远镜（FAST）的L波段宽带四脊波导正交模换能器（OMT）。通过分别设计OMT的两个关键部分，并在两个正交探针中引入匹配环，成功地实现了宽带性能的改善。OMT设计在0.95 GHz-1.9 GHz频段内工作，仿真结果显示，两种极化的回波损耗均优于−20 dB，交叉极化隔离水平超过45 dB，整个带宽内的插入损耗低于0.15 dB。测量结果与模拟结果吻合较好。
In this paper, an L-band wideband quad-ridged waveguide orthomode transducer (OMT) for the Five hundred meter Aperture Spherical radio Telescope (FAST) is presented with a simple design principle. By designing two critical parts of the OMT separately and introducing matching rings into two orthogonal probes, an improved wideband performance has been realized successfully. The OMT is designed to operate across the 0.95 GHz–1.9 GHz band, and the simulation shows a return loss better than −20 dB for both polarizations, cross-polarized isolation levels over 45 dB and insertion loss lower than 0.15 dB over the entire bandwidth. The measured results are in good agreement with the simulations.