Broadband Dual-band Orthomode Transduer and E - Plane Corrugated Horn Antenna Design

• Main Authors: Chang-Yan Jhuo, 卓長彥
• Other Authors: Wanchu Hong
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/73002447293922618182

碩士 === 國立彰化師範大學 === 電信工程研究所 === 102 === In this thesis, we have proposed a miniature broadband orthomode transducer (OMT) used in K and Ka band. In order to prevent interference between between receiver port and transmitter port,we use the septum structure toattain enough isolation (not less than 30 dB). This structure includes a tapered impedance transformer, and septums with different shapes are placed in the receiver port and transition region. Such arrangement can effectively decrease cross-polarization between two orthogonal polarizations, but increases the manufacture complexity and cost. Therefore, we proposed a novel OMT structure which neither septums nor pins are used. In this structure, the transmitter port is tapered directly into the common port, and the receiver port is matched to the common port using the stepped impedance transformer. We use HFSS and FEKO to obtain the optimal structure dimensions. Finally, the measurement and simulation results are discussed.