The 54th Research Institute of CECT

Shijiazhuang, China

The 54th Research Institute of CECT

Shijiazhuang, China
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Wang B.,The 54th Research Institute of CECT | Tian B.,The 54th Research Institute of CECT | Wang C.-T.,The 54th Research Institute of CECT
Hongwai Yu Haomibo Xuebao/Journal of Infrared and Millimeter Waves | Year: 2017

Power combining technology is an effective method to improve the output power of a system when the output power of a single amplifier does not meet the requirement of the system. In this paper, a new type of waveguide E-T junction power divider/combiner based on thin film resistor was studied in detail, and a novel waveguide E-T junction based on thin film resistor was designed. The structure has the advantages of high isolation, low insert loss, small size, and wide band. In order to increase the power which the waveguide E-T junction based on thin film resistor can bear, we try to increase the area of the thin film resistor by designing the length to width ratio of the thin film resistor reasonably, and use the aluminum nitride substrate with high thermal conductivity as the dielectric substrate of the microstrip and thin film resistor. The novel waveguide E-T junction based on thin film resistor was simulated in 3D electromagnetic simulation software HFSS. After testing, the insert loss was less than 0.2 dB, the return loss was better than -15 dB, the isolation was better than 10dB in 25~34 GHz. The measured results were consistent with the simulated results, and the structure has a good engineering application value. © 2017, Science Press. All right reserved.


Wang B.,The 54th Research Institute of CECT | Liu L.,The 54th Research Institute of CECT | Xie X.,University of Science and Technology of China | Wang C.,The 54th Research Institute of CECT
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2017

In order to improve the output power of Ka band power amplifier, this paper presents a novel waveguide-based spatial power combing amplifier at millimeter-wave frequency. A magic T-power combiner and a waveguide-microstrip transfer are adopted in the waveguide spatial power dividing/combining network. And a four-way broadband low loss symmetrical power combining is achieved at millimeter-wave frequency. In the millimeter-wave power combining amplifier, the corresponding power combining efficiency is more than 82% in 25-29GHz, and more than 86% in 25-28GHz. Copyright © 2017 by Editorial Department of Chinese Journal of Radio Science


Fan G.,The 54th Research Institute of CECT | Yu B.,The 54th Research Institute of CECT | Deng Z.,The 54th Research Institute of CECT | Yang P.,The 54th Research Institute of CECT
Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics | Year: 2012

Space and time anti-interference for global navigation satellites system(GNSS) receivers requires good real-time processing ability .This limits the application of conventional matrix inversion algorithms due to their large amount of computation. Based on the analysis of the principle of multi-stage wiener filtering and combined with Krylov subspace nature, a multi-stage Wiener filter was designed for GNSS receivers. In this way, a reduction of filtering dimensions in Krylov subspace was achieved and the intensive computation for matrix inversion was avoided. Simulation results show that the proposed method can effectively reduce the amount of STAP algorithm computation with no anti-interference performance being affected and is more appropriate for real-time applications.


Duan Z.,State Key Laboratory of Satellite Navigation System and Equipment Technology | Duan Z.,The 54th Research Institute of CECT | Fan G.,State Key Laboratory of Satellite Navigation System and Equipment Technology | Fan G.,The 54th Research Institute of CECT | And 2 more authors.
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | Year: 2015

Aiming at narrowband interference suppression problem which satellite navigation receiving terminal faced with, combined with Krylov subspace nature, the multistage Wiener filtering algorithm based on Krylov subspace was applied to navigation receiving terminal narrowband interference suppression, which can achieve a navigation reciever adaptive narrow-band interference suppression, so that it can achieve the optimal output SNR (signal-to-noise ratio). The method solved the issue of large amount computation for traditional Wiener filtering due to matrix inversion. Simulation results show that the algorithm has a simple structure and lower computation than that of the optimal filter. Thus, it is a practical algorithm for narrow-band interference suppression. © 2015, Huazhong University of Science and Technology. All right reserved.

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