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A Ku band 7-bit PIN diode phase shifter is presented in this paper. Developed switched-line with loaded-line circuits [1,2] and reflective-type with loaded-line circuits are employed to extend the band width and achieve good phase shifting characteristics. Adopting more composition bits and adding open stubs to each bit as tuning elements help the phase shifter achieve finer phase control and easier...
A direct torque control strategy based on zero voltage vector distribution is proposed for neutral point clamped (NPC) three-level inverter-fed permanent magnet synchronous motor (PMSM) drive system, which is characterized by low torque ripples and fast speed response. In this proposed control scheme, 12 synthesizing voltage vectors with zero voltage vector are selected according to the error switching...
A switched line microwave digital phase shifter and a hybrid coupler phase shifter using PIN diodes which are operated at center frequencies from 14GHz to 14.5GHz are presented. The former is able to realize 180 degree phase shift and the latter is able to realize 11.25 degree phase shift. The phase shifters are designed to implement on a microstrip circuit type. Both of the two phase shifters can...
In this paper, a Ku band seven bit microwave digital phase shifter using PIN diodes is designed based on simulation software ADS(Advanced Design Simulation). The circuit consists of four bits realized by hybrid coupler phase shifters and three bits realized by switched line phase shifters. All of seven bits take proper measures to obtain flat phase shift. The phase shifter is designed to implement...
Compared to regular independent ground electrode, common grounding electrode has its own technical challenges and more complex aspects to be considered in the design. The characteristics between common grounding electrode and regular independent ground electrode are presented in this paper. The different forms that common grounding electrode can adopt and the applicability of each form are analyzed...
Web service composition makes it possible for Web service reused, assembled, providing value-added service. The key problem of Web service composition is to find an effective modeling language and to describe it with composition definition language. BPEL4WS is a newly process definition language which is relatively complex and difficult to use. And BPEL4WS only supports static binding of existing...
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