Low-Loss Microcoaxial Rat-Race Hybrid for Si-Based Microwave Integrated Circuits

Tian, Ye; Wang, Hong; Liu, Zhihong; Meng, Qianqian; Lee, Kok-Yan

doi:10.1109/lmwc.2016.2524657

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…The MSL to DSPSL balun has an ultrawide working bandwidth and is easy to fabricate, which is widely used in the feed of the spiral antennas [8] and push-pull power amplifiers [9], but it suffers a poor match and phase fluctuation problem. Other baluns based on the four-port passive circuit, such as rat-race hybrids [10] and magic tees [11], [12], all have the shortcoming of a narrow bandwidth. The newly emerging filtering balun based on the forms above can simultaneously achieve the function of a balun and a filter [13]- [16], with disadvantages that depend on the balun form adopted.…”

Section: Introductionmentioning

confidence: 99%

Design of a Planar Transmission Line Balun Based on Novel Phase Inverter

Jiang

et al. 2020

IEEE Access

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In this paper, a planar ultrawideband (UWB) transmission line balun based on a novel phase inverter is proposed, which consists of three coaxial connector to double-sided parallel-strip line (DSPSL) transitions, a two-section Wilkinson divider, and a phase inverter. In the phase inverter, a 90-degree rotating transition is applied to realize field inversion. It maintains good structural uniformity of the two outputs of the balun and ensures the characteristics of equal energy division and a stable 180-degree phase difference in wide frequency band. Compared with other designs, the proposed balun has the advantages of easy to design, UWB operation, low reflection, equal power division and a stable phase difference. The presented balun works in the 0.52 GHz to 2.32 GHz band, covering 4.46 octaves. The measurements can achieve the reflection, amplitude imbalance and phase imbalance characteristics below −15 dB, ±0.46 dB and ±4 deg, respectively. The designs including the phase inverter and balun are fabricated and measured to verify the performance, and the measurements are found to be in good agreement with the simulations. In addition, the UWB potential of the porposed balun is studied. From an example based on a 1:2 balun, we can conclude that the proposed balun has the potential to work in a wider frequency band within the range of 0.1 GHz to 3GHz.INDEX TERMS Double-sided parallel-strip line (DSPSL), phase inverter, transmission line balun, ultrawideband (UWB).

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