X. F. Ye

Nonperturbative stochastic inflation in perturbative dynamical background

X. F. Ye, Shao-Jiang Wang

Inflationary models that contain a transient ultra-slow-roll phase can exhibit strong non-perturbative dynamics, making the usual perturbative treatment of cosmological fluctuations incomplete. In such regimes, quantum diffusion and the nonlinear gravitational response of the background can both play important roles, motivating a …

Nonperturbative stochastic inflation in perturbative dynamical background

X. F. Ye, Shao-Jiang Wang

Inflationary models that contain a transient ultra-slow-roll phase can exhibit strong non-perturbative dynamics, making the usual perturbative treatment of cosmological fluctuations incomplete. In such regimes, quantum diffusion and the nonlinear gravitational response of the background can both play important roles, motivating a …

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A Y-Band Ultra-Wideband Branch Waveguide Coupler Design Based on Rectangular Waveguides

X. F. Ye, Jun Tang Yuan, Yinian Feng, Bo Zhang

In this paper, a novel offset branch waveguide structure based on an$E$-plane coupler is proposed to realize an ultra-wideband terahertz coupler operating at a center frequency of 330 GHz. The design achieves a 3 dB coupling over the frequency range from 260 …

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Feynman rules and loop structure of Carrollian amplitudes

Wen-Bin Liu, Jiang Long, X. F. Ye

A bstract In this paper, we derive the Carrollian amplitude in the framework of bulk reduction. The Carrollian amplitude is shown to relate to the scattering amplitude by a Fourier transform in this method. We propose Feynman rules to calculate the Carrollian …

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Feynman rules and loop structure of Carrollian amplitudes

Wenbin Liu, Jiang Long, X. F. Ye

In this paper, we derive the Carrollian amplitude in the framework of bulk reduction. The Carrollian amplitude is shown to relate to the scattering amplitude by a Fourier transform in this method. We propose Feynman rules to calculate the Carrollian amplitude where …

Coupling coefficient reconfigurable quadrature coupler based on mechanical switches

Bing Jie Xiang, X. F. Ye, Yu Fei Pan, Shaoyong Zheng et autres

The conventional reconfigurable quadrature coupler configuration usually requires an external supply voltage which reduces its robustness. A new quadrature coupler with reconfigurable coupling coefficient is implemented using a mechanical control approach to simultaneously satisfy high performance and reliability requirements. Two mechanical switches …

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A bandpass filtering balun based on circular sector patch

X. F. Ye, Yuzhong Shi, E. Guo, Shaoyong Zheng

A feasible design of balun filter is implemented using a circular sector patch element with simplicity in design and fabrication. In order to further improve bandpass filtering properties and compress the circuit size simultaneously, complementary split ring resonators are introduced on the …

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Novel compact balun based on slotted square patch

Yongyi Tan, X. F. Ye, Bing Jie Xiang, Shaoyong Zheng

In this paper, a novel patch based balun with compact size is presented. This balun consists of a simple square patch etched by a pair of asymmetric slots. The unbalanced input port is orthogonally arranged in-between two balanced output ports along the …

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A compact patch coupler with an arbitrary phase difference for millimeter-wave applications

Bo-Wei Xu, X. F. Ye, Shaoyong Zheng

This paper presents a millimeter-wave 3 dB coupler configuration to provide an arbitrary phase difference between two output ports. The property can be easily achieved by adjusting the separation angle between ports located on the contour of patch, resulting in a simple …

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