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- reconfigurable feed network
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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) - Reconfigurable Reflectarrays and Transmitarrays: From Antenna Designs to System Applications
摘要： This paper reviews the recent research progress on reconfigurable reflectarrays (RRA) and reconfigurable transmitarrays (RTA) at Tsinghua University. Numerous antenna designs are presented, including W-band RRA, 2-bit RRA, 10240-element RRA, 2-layer RTA, and current-reversal RTA. Furthermore, the RRA and RTA demonstrate a promising potential in advanced wireless systems. As an example, a RRA-based security imaging system is illustrated in details.
关键词： reconfigurable,antenna,reflectarray,transmitarray
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Chengdu (2018.3.26-2018.3.28)] 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Polarization Reconfigurbale Antenna with Liquid Metal
摘要： In this paper, we present a polarization reconfigurable liquid dielectric resonator antenna (DRA) incorporating liquid metal. For the liquid dielectric solution, we use ethyl acetate and for the liquid metal solution, an alloy called Galinstan was used. Before introduction of the liquid metal electric field within the DRA was orientated along the Y-axis. Then by injecting the liquid metal into the liquid dielectric, the electric field rotated 45 degrees. Consequently, polarization reconfiguration was achieved. All of the results presented in this paper were obtained through computer simulation in HFSS.
关键词： liquid metal,Liquid dielectric resonator antenna,polarization reconfigurable antenna
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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Continuous-range tunable multilayer frequency-selective surfaces using origami and inkjet printing
摘要： The tremendous increase in the number of components in typical electrical and communication modules requires low-cost, flexible and multifunctional sensing, energy harvesting, and communication modules that can readily reconfigure, depending on changes in their environment. Current subtractive manufacturing-based reconfigurable systems offer limited flexibility (limited finite number of discrete reconfiguration states) and have high fabrication cost and time requirements. Thus, this paper introduces an approach to solve the problem by combining additive manufacturing and origami principles to realize tunable electrical components that can be reconfigured over continuous-state ranges from folded (compact) to unfolded (large surface) configurations. Special 'bridge-like' structures are introduced along the traces that increase their flexibility, thereby avoiding breakage during folding. These techniques allow creating truly flexible conductive traces that can maintain high conductivity even for large bending angles, further enhancing the states of reconfigurability. To demonstrate the idea, a Miura-Ori pattern is used to fabricate spatial filters—frequency-selective surfaces (FSSs) with dipole resonant elements placed along the fold lines. The electrical length of the dipole elements in these structures changes when the Miura-Ori is folded, which facilitates tunable frequency response for the proposed shape-reconfigurable FSS structure. Higher-order spatial filters are realized by creating multilayer Miura-FSS configurations, which further increase the overall bandwidth of the structure. Such multilayer Miura-FSS structures feature the unprecedented capability of on-the-fly reconfigurability to different specifications (multiple bands, broadband/narrowband bandwidth, wide angle of incidence rejection), requiring neither specialized substrates nor highly complex electronics, holding frames, or fabrication processes.
关键词： origami,tunable electromagnetic structures,deployable structures,frequency-selective surfaces,reconfigurable spatial filters
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Ku-Band Liquid-Crystal-Based Frequency Reconfigurable Comb SIW Slot Leaky-Wave Antenna
摘要： In this paper, based on liquid crystal anisotropy characteristics, a kind of frequency reconfigurable comb substrate integrate waveguide slot leaky-wave antenna use liquid-crystal-based is proposed at Ku band. It adopt comb shape and defected ground structure to compose comb SIW’s top and bottom. The slots are etched at top and bottom surface. The resonant point of propose antenna move from 15.85GHz to 14.37GHz, the tunable range is 1.5GHz by changing liquid crystal’s permittivity. Return loss less than -30dB at resonant point and the maximum gain is 8.79dB. The bandwidth of proposed antenna is 1 GHz. All the results show the reconfigurable of proposed antenna is good.
关键词： leaky-wave antenna,reconfigurable,comb substrate integrate waveguide,liquid crystal
更新于2025-09-04 15:30:14
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Novel Multifunctional Reconfigurable Active Frequency Selective Surface
摘要： In this paper, a multifunctional active frequency selective surface (AFSS) is presented based on the switching responses of active components. The proposed structure comprises periodic arrays of metallic patterns imprinted on both sides of an FR4 substrate on which PIN diodes are embedded with parallel feed networks. The novelty of the design lies in its multifunctional characteristics with independent control of the biasing states (ON/OFF) of the diodes mounted on opposite layers. This leads to four different working states (dual-bandpass for OFF-OFF state, single-band absorber for OFF-ON state, single-bandpass for ON- OFF state, and reflector for ON-ON state) being facilitated by the proposed reconfigurable AFSS. Furthermore, the effects of the design parameters and active components on multifunctional responses are extensively analyzed by deriving equivalent circuit models. Even though the topology is polarization-sensitive, multiple dividable working functions (transmission, absorption and reflection) have been realized in single geometry unlike the earlier reported designs. The proposed structure has also been the measured responses show reasonable fabricated and agreement with the simulated results under normal incidence. A multifunctional AFSS with such diverse characteristics is an essential element for regulating electromagnetic wave propagation in manifold applications.
关键词： PIN diode,reconfigurable structure,Active frequency selective surface (AFSS),multifunctional AFSS (MAFSS)
更新于2025-09-04 15:30:14