Shijiazhuang Institute of Electrostatic and Electromagnetic Protection

Shijiazhuang, China

Shijiazhuang Institute of Electrostatic and Electromagnetic Protection

Shijiazhuang, China
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Wan T.,Nanjing University of Posts and Telecommunications | Wan T.,State Key Laboratory of Millimeter Waves | Du L.,Shijiazhuang Institute of Electrostatic and Electromagnetic Protection | Hu Y.,Nanjing University of Posts and Telecommunications
2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, IEEE MTT-S IMWS-AMP 2015 - Proceedings | Year: 2015

For the fast design of microwave circuit, an unconditionally stable and fully explicit finite-element time-domain (FETD) method is presented. The Crank-Nicolson (CN) scheme is implemented leading to an unconditionally stable mixed FETD method. A hierarchical (H-) matrix algorithm is introduced to provide a data-sparse way to approximate the inverse of the sparse system matrix produced by the CN-FETD method which is dense originally. This approximate inverse can be computed and stored with almost linear complexity, and then the CN-FETD method can be computed explicitly at each time step. Examples of two microwave devices are simulated to demonstrate the efficiency and accuracy of the proposed method. © 2015 IEEE.


Wan T.,Nanjing University of Posts and Telecommunications | Wan T.,State Key Laboratory of Millimeter Waves | Du L.,Shijiazhuang Institute of Electrostatic and Electromagnetic Protection | Hong T.,Nanjing University of Posts and Telecommunications | And 2 more authors.
Electromagnetics | Year: 2015

In this article, an efficient algorithm is presented for the mixed finite-element time-domain solution of Maxwell equations. The implicit finite-element time-domain method based on the Crank-Nicolson time integration is unconditionally stable but involves solving a linear system at each time step. A data-sparse matrix decomposition algorithm combined with the nested dissection technique is developed to solve the large linear system. Based on the hierarchical matrix (H-matrix) formatted arithmetic, this algorithm can reduce the computational costs to be almost linear. Moreover, an iterative improvement method is introduced to further improve the solution performance. Numerical results demonstrate the effectiveness of the proposed method for the analysis of microwave circuits. Copyright © Taylor & Francis Group, LLC.


Xu J.,Nanjing University of Science and Technology | Bi J.J.,Shijiazhuang Institute of Electrostatic and Electromagnetic Protection | Li Z.L.,Nanjing University of Science and Technology | Li Z.L.,Nanjing Southeast University | Chen R.S.,Nanjing University of Science and Technology
International Journal of Electronics | Year: 2016

This work presents a substrate integrated waveguide (SIW) bandpass filter with wide and precipitous stopband, which is different from filters with a direct input/output coupling structure. Higher modes in the SIW cavities are used to generate the finite transmission zeros for improved stopband performance. The design of SIW filters requires full wave electromagnetic simulation and extensive optimisation. If a full wave solver is used for optimisation, the design process is very time consuming. The space mapping (SM) approach has been called upon to alleviate this problem. In this case, the coarse model is optimised using an equivalent circuit model-based representation of the structure for fast computations. On the other hand, the verification of the design is completed with an accurate fine model full wave simulation. A fourth-order filter with a passband of 12.0–12.5 GHz is fabricated on a single layer Rogers RT/Duroid 5880 substrate. The return loss is better than 17.4 dB in the passband and the rejection is more than 40 dB in the stopband. The stopband is from 2 to 11 GHz and 13.5 to 17.3 GHz, demonstrating a wide bandwidth performance. © 2016 Informa UK Limited, trading as Taylor & Francis Group


Xu J.,Nanjing University of Science and Technology | Bi J.,Nanjing University of Science and Technology | Bi J.,Shijiazhuang Institute of Electrostatic and Electromagnetic Protection | Li Z.,Nanjing University of Science and Technology | Chen R.,Nanjing University of Science and Technology
Electronics Letters | Year: 2015

A novel substrate integrated waveguide (SIW) highpass filter with sharp attenuation characteristics using shunt SIW resonant stubs is proposed. The highpass filter consists of a main SIW transmission line loaded with three shunt SIW resonant stubs. The three shunt SIW resonant stubs are used to realise the band-stop filter, whose stopband is designed to coincide with the transition band of the SIW highpass filter. Therefore, the sharp attenuation of the stopband filter contributes to the attenuation of the entire filter. To verify the concept, a filter prototype with a cutoff frequency of 16 GHz is designed, fabricated and measured. Another hybrid filter with the same specifications is fabricated and compared. The measured results show that the proposed filter has sharper attenuation characteristics than the hybrid filter. © The Institution of Engineering and Technology 2015.

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