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| Articles
by
Xiuqin Xu |
Total Records (
3 ) for
Xiuqin Xu |
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Qin Zheng
,
Yongheng Shang
,
Zhiyu Wang
,
Jiarui Liu
,
Min Zhou
,
Xiuqin Xu
,
Liping Wang
,
Hua Chen
,
Zhengliang Huang
,
Zheming Lu
and
Faxin Yu
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In this study, an automated testing system for a reflection-type Vector Modulators (VM) comprised of a Field Programmable Gate Array (FPGA) and a LabVIEW based testing software is presented. The testing system with a friendly Graphic User Interface (GUI) is able to evaluate all the functionality of the VMs and allows the user to test the FPGA module step-by-step or to automate the testing in a sequential way. In case of multiple VM testing, all the VMs can be tested in one time by automatically sending the control commands to manipulate the bias voltage of each VM. Only one FPGA based hardware is needed in the testing system for the bias voltage control. This present testing system is highly efficient for VM testing and can be easily generalized to the testing of other VMs. |
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Liping Wang
,
Jiarui Liu
,
Huaqing Tong
,
Ming Hong
,
Yiqun Hu
,
Xiuqin Xu
,
Hua Chen
,
Zhiyu Wang
,
Yongheng Shang
,
Zhengliang Huang
and
Faxin Yu
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A novel highly integrated front-end T/R module with eight RF channels for the application of a K-band transceiver is presented. The proposed T/R module is based on the LTCC package combined with embedded microwave passive circuits and a variety of microwave transistor dies. Due to the applied multi-layer LTCC technology, the overall size and weight of the designed module is greatly reduced. Furthermore, such design improves the overall performance of the T/R module with a lower cost and high efficiency. |
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Wei Chen
,
Xiuqin Xu
,
Hui Xu
,
Ming Hong
,
Zhiyu Wang
,
Yongheng Shang
,
Dongdong Liu
,
Min Zhou
,
Zhengliang Huang
and
Faxin Yu
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This study presents the temporal Coupled-Mode Theory (CMT) analysis of a K-band
MMIC (Microwave Monolithic Integrated Circuit) bandpass filter with dual orthogonal
resonant modes. Two test methods are applied and compared in the filter response
measurement. The dimensions of the MMIC filter, whose chip size is 1.9×1.35
mm, are optimized based on the FEM (Finite Element Method) simulation assisted
temporal coupled-mode theory. As a two-port reciprocal system, the transmission
and reflection responses of the filter are deduced. GaAs MMIC IPD (Integrated
Passive Device) technology is applied for chip fabrication. The test results
using a probe station fit well with the simulation results. A testing fixture
is introduced to model the practical application scenario, whose measurement
results, after de-embedment, have shown consistency with the simulation and
the probe station test results. |
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