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In this paper, an electrical array antenna based on liquid crystal (LC) miniaturized phase shifter is designed and simulated, with the capability of beam steering from backfire to endfire. Special chamfered design of meander line is proposed to obtain compact phase shifter based on LC. The antenna integrates phase shifters, power dividers and patch antennas on a substrate to achieve reduced occupied...
A compact dual-band 4×4 butler matrix is presented for multi-beam antenna consisting of dual-band coupler and phase shifter. The network is realized on a single substrate without any crossovers. Within the working frequency range, the butler matrix exhibits good couplings of between −7.6 and −6.2 dB, and the progressive phase between antenna ports can create four radiation beams at 2.45GHz and 5.8GHz.
In this paper, novel RF distributed MEMS transmission line (DMTL) phase shifters based on rectangular and arched bridge-like coplanar waveguides (rec-BCPW and arc-BCPW) structure are proposed and the comparison of their configuration and RF performance is also presented. A CST software is used for the modeling, simulation and optimization from 30 to 40 GHz. Simulation and optimization results show...
The reliability of MEMS switches is closely linked to their operational and environmental conditions. This paper reports on the investigation of the actuated voltage shift mechanism in MEMS capacitive switch for millimeter-wave phase shifter design. Considering the dielectric charging and polarization effects on capacitive MEMS switch with silicon nitride as dielectric layer, an accurate model of...
A novel low-driven MEMS capacitive switch structure for microwave distributed phase shifter is presented based on the analysis of the operation principle. The driven voltage, response time, release time and vibration modes of the capacitive switch are analyzed using the Intellisuitetrade software. The simulation results show the driven voltage of 2.5 V, the response time less than 30 us, the release...
The operating principle of the RF MEMS phase shifter is described. A novel design concept for dual-frequency RF MEMS phase shifter is proposed. By using network theory and CST microwave studio simulation tool, the proposed RF MEMS phase shifter is modelled. Simulation results show that the proposed model has the return loss less than -10dB and the insertion loss more than -2dB in two operating frequencies,...
The phase shift features of the RF MEMS phase shifter are described. The approach of adding an insulation layer below the RF MEMS bridge to increase phase shift and improve reliability is proposed, in addition, the saw-shaped CPW is used to decrease the return loss introduced by the insulation layer. By using network theory and CST microwave studio simulation tool, the proposed RF MEMS phase shifter...
A novel packaging structure which is performed using wafer level micropackaging on the thin silicon substrate as the distributed MEMS phase shifters wafer with vertical feedthrough is presented. The RF performances of proposed structure are investigated using Microwave Studio (CST). The results show that the insertion loss (S21) and return loss (S11) was -0.4-1.84 dB and under -10 dB at 1-50 GHz....
In this paper, on-wafer level packaging technology for RF MEMS is described, and then a novel packaging design for RF MEMS devices with different fabrication technology at millimeter-wave band is presented. The discussed RF MEMS devices on naked wafer includes a MEMS filter and a distributed MEMS transmission line (DMTL) phase shifter, which are fabricated using LIGA and micromachined technology,...
With RF MEMS technology rapid development, the distributed RF MEMS phase shifters have exhibited excellent RF performance, such as high isolation, high phase shifts, low insertion loss and wide bandwidth operation features at high frequency. However, the applications of RF MEMS phase shifter are hampered by the lack of production-worthy wafer level packaging. Therefore, the problems on packaging solved...
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