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A SIMPLE 2×3 BEAM-FORMING NETWORK WITH A 2-BIT PHASE SHIFTER FOR FOUR-BEAM RECONFIGURATION
摘要： A simple 2×3 recon?gurable beam-forming network (R-BFN) for four-beam recon?guration application is designed and implemented. The proposed R-BFN with two input ports and three output ports consists of a 2:1 power divider, a 90? hybrid, a 180? hybrid and a 2-bit phase shifter. The 2-bit phase shifter has two states: one is a 180? phase shifter (State 1); the other is a 0?/360? phase shifter (State 2). By introducing the 2-bit phase shifter, the constant phase di?erences of three output ports can be recon?gured. When the proposed R-BFN is connected to an antenna array, a four-beam recon?guration is obtained. Simulated and measured results show that good impedance matching, high port isolation, equal power division, and constant phase di?erence have been achieved simultaneously within the operation band of 2.4–2.6 GHz. The capability of the proposed R-BFN to recon?gure beams is also veri?ed experimentally by using a 2.5 GHz dipole array.
关键词： antenna array,phase shifter,recon?guration,beam-forming network
更新于2025-09-09 09:28:46
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - W-Band True-Time Delay Phase Shifters Using Paraffin Microactuators
摘要： We report a distributed loaded line phase shifter based on a new class of electro-thermally actuated RF MEMS devices using paraf?n phase-change material (PCM). Paraf?n is a low loss (tan δ = 6.6×10?4) mechanical phase-change material that exhibits a 15% volumetric change through its solid-liquid transition. Due to its unique electrical and mechanical properties, paraf?n PCM variable capacitors exhibit a very low loss which is critical in designing recon?gurable structures. Here, a low-loss paraf?n PCM based true-time delay, continuously-tunable phase shifter is designed and optimized. A ?gure-of merit of 71.8?/dB is achieved while maintaining a return loss more than 12 dB. Designed phase shifter has a maximum insertion loss of 5 dB for a 360? phase shift. Electro-thermo-mechanical performance of the paraf?n PCM device is studied by carrying out a fully coupled multiphysics simulation. Maximum displacement of 0.8 μm is achieved with a 2.6 μm-thick paraf?n ?lm. A new fabrication method for the deposition of the thin paraf?n ?lm is developed and a fabrication process for the device is presented.
关键词： MEMS,phase shifter,phase-change material,DMTL,paraf?n,millimeter wave
更新于2025-09-04 15:30:14
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Tunable Liquid Crystal Based Phase Shifter with a Slot Unit Cell for Reconfigurable Reflectarrays in F-Band
摘要： An electrically tuned phase shifter based on the single slot unit cell and liquid crystal for a reconfigurable reflectarray antenna was presented. The simulation and measured results obtained at the F-band were used to demonstrate that the dielectric properties of a nematic state liquid crystal could be exploited to realize a slot unit cell phase shifter for the reconfigurable reflectarrays antennas. By reducing the inhomogeneous of the external electric field in the liquid crystal layer, a lower control voltage and improved model accuracy was obtained. In the experiments test, the achieved saturation bias voltage (10 V) was smaller than the previously reported structure, and the phase shift of the reflectarray greater than 300? was achieved in the frequency range 121.5–126 GHz. The maximum phase shift of 306? occurred at 124.5 GHz.
关键词： phase shifter,phase control,liquid crystal device,reconfigurable reflectarray
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Compact Broadband Electronically Controllable SIW Phase Shifter for 5G Phased Array Antennas
摘要： This work presents a novel compact and broadband electronically controllable substrate integrated waveguide (SIW) phase shifter intended for beamsteering applications in antenna arrays for 5G wireless communication. The proposed phase shifter is designed to operate over a large bandwidth (26 GHz – 32 GHz) with a simulated maximum insertion loss of less than 3 dB and a maximum phase difference of more than 1000+50 over the entire band. The phase shift is provided via metal posts which are switched between capacitive and inductive loading through beam-lead PIN diodes.
关键词： 5G,antennas,Phase shifter,antenna arrays,SIW,millimeter wave
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Design of Millimetre Wave Phase Shifting Periodic Metasurfaces
摘要： A high impedance surface capable of analogue phase shifting in the millimetre wave band has been simulated and is realisable with the use of piezoelectric actuators with enhanced displacement. The phase shifter demonstrates a signi?cantly higher bandwidth and frequency range, along with lower losses, than previously proposed systems. Tuning can be achieved with a single, mechanically ampli?ed, piezoelectric actuator. Using the available displacement provided by such actuators, it has been demonstrated that over 200 degrees of phase shift should be achievable over a 27 GHz band when utilising the improved patch unit cell.
关键词： phase shifter,high impedance surface,millimetre wave
更新于2025-09-04 15:30:14