Hybrid structure-based broadband field-rotation balun for millimeter-wave applications

J. Moghaddasi, K. Wu
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引用次数: 3

Abstract

A broadband balun structure is developed through a hybrid combination of substrate integrated waveguide (SIW) and antipodal fin-line topologies. The signal at the balanced port is divided between two unbalanced ports using a broadband SIW power divider which is capable of an equal power division with low phase and amplitude imbalance over a wide bandwidth. The 180° phase difference is made by the rotation of E-field polarization through the antipodal fin-line sections in two unbalanced branches. Due to the independency of this phase shifting with respect to propagation constant and wavelength, a constant 180° phase difference is achieved in a wide range of frequency. Using a printed circuit board (PCB) process, the proposed balun is prototyped and demonstrated for operation at millimeter-wave frequencies from 70 GHz to 90 GHz. The measurement results show an excellent performance with very low insertion loss of less than 1 dB and 180° phase difference between the unbalanced ports in a broad band of frequency.
基于混合结构的毫米波宽带场旋转平衡器
通过衬底集成波导(SIW)和对跖鳍线拓扑的混合组合,开发了宽带平衡结构。平衡端口的信号使用宽带SIW功率分配器在两个不平衡端口之间进行划分,该分配器能够在宽带宽上具有低相位和幅度不平衡的等功率划分。180°的相位差是由电场偏振通过两个不平衡分支的对跖鳍线部分的旋转产生的。由于这种相移与传播常数和波长无关,在很宽的频率范围内实现了恒定的180°相位差。利用印刷电路板(PCB)工艺,所提出的平衡器原型和演示工作在毫米波频率从70 GHz到90 GHz。测量结果表明,在宽带频率范围内,不平衡端口之间的相位差为180°,插入损耗小于1 dB,具有优异的性能。
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