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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 dual band CRLH leaky wave antenna with electrically steerable beam based on liquid crystals is designed and investigated. Lots of full-wave simulations are conducted with CST MW Studio software package to optimize and analyze the performance of the antenna. It shown that the proposed LWA achieves the beam scanning from −16° to + 21° at 7.2 GHz and from −10° to + 19° at 9 GHz simultaneously, through...
This paper proposes a metamaterial-inspired radome with a wide absorption band and a highly-transparent transmission window. The proposed radome is configured by replacing the ground plane of a metamaterial-inspired absorber with a band-pass frequency selective surface (FSS). In the receiving mode, the radome shows absorption of 90% from 9.1 to 24.8 GHz and a transmission of 95% at 28.1 GHz. In the...
In this study, a wideband frequency selective radome is represented, which can absorb the microwave of KU band, and will transmit the higher frequency power. This radome is composed of two different frequency selective surfaces (FSS). The transmission window and absorbing band are realized by the principle of impedance matching. Lossless foam is used as the medium while the absorbing band is promised...
An automatic design and fabrication method for a broadband circular-polarized gradient index metamaterial (GIM) lens is proposed. There two key points: Firstly, the GIM lens consists of isotropic dielectric plate with deep-subwavelength through-holes, which have very little influence on the polarization states of incident waves; Secondly, the analytical formulas for the distribution rules of the through-holes...
A zero index metamaterial lens (ZIML) is proposed in this paper for antenna directivity and gain enhancement. The zero index metamaterial (ZIM) is constructed from both electric metamaterial with near-zero permittivity and magnetic metamaterial-modified split ring resonator (MSRR)-with near-zero permeability. The ZIM unit cell is numerically simulated in CST MWS. The scattering parameters show that...
In this paper, we developed a thermal actuated lateral RF MEMS capacitive switch using the HfO2 film as sidewall isolation dielectric based on atomic layer deposition (ALD) process to approve the isolation and reliability. In close state, the HfO2 film provides strong capacitive coupling between the signal line and switching plate, as well as electrical isolation performance between the switching...
In this paper, a FSS unit with band-pass property is designed. The angle stability and polarization stability of this unit is studied through simulation. Then a finite FSS composed by this unit is designed to be the planar radome. A single circular polarization microstrip antenna and a phased array antenna are used to verify the change of the performance of the antenna or the phased array antenna...
In this paper we present the design of a multilayer absorber designed to perform over a wide frequency band, starting at relatively low frequencies. We design an absorber comprising of 20 layers, in which the material parameters are tapered in an exponential manner. In addition, the absorber itself is physically tapered at an angle so that it resembles a truncated pyramid. It is shown that the absorber...
A cylindrical conformal 2 × 2 microstrip circularly polarized antenna sub-array operating at millimeter-wave band is proposed. A square patch with triangular truncated corner is designed to construct circularly polarized element. This element is connected by T mode parallel feed network to form 2 × 2 circularly polarized antenna arrays. Based on planar structure analysis, a conformal sub-array mounted...
Using coplanar waveguide (CPW) to construct left-handed(LH) transmission line is more effective method than microstrip line. In this paper, a new type of LH transmission-line is proposed. It is composed with parallel embedded inductive and serial interdigital capacitor. Through extracting ?? parameter of CPW transmission line, the region of LH transmission-line is obtained from 6 GHz to 14 GHz. The...
Toward the traditional millimeter-wave microstrip antenna having narrow band and high side-lobe causing severe influence to radiation of antenna, a novel 8 element feed network is designed, which has a asymmetry structure. Comparing with traditional antenna array, we certify this kind of antenna has ability to wide bandwidth and enhance performance of patterns. The bandwidth of the antenna is about...
The work presents a design of millimeter-wave conformal microstrip antenna arrays. Based on the HFM and the parallel feed network, two conformal microstrip 4x4 arrays respectively on a cylinder and an elliptic cylinder surface are designed by the isotropic transformation theory (IT). Simulation results show that the conformal arrays work at 35 GHz and the gains are 20.43 dB and 20.61 dB at the center...
The operating principle of the RF MEMS phase shifter is described. Then the equivalent circuit of the MEMS phase shifter has been established and the capacitances of the MEMS bridges in both ldquouprdquo and ldquodownrdquo state are analyzed. Then the approach of using the saw-shaped CPW to decrease the return loss introduced by the insulation layer is proposed. By using network theory, the circuit...
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...
In this letter, a further miniaturization approach for the exiting MCR design extending analysis to 3D isotropic case. It is shown that the subwavelength resonance occurs when transversal permeability components have opposite signs. In this case, the rectangular cavity supports subwavelength resonance, and the width and length of such the rectangular cavity resonator can be in principle simultaneously...
In this paper, a novel RF-MEMS phase shifter based on a rectangle bridge-like coplanar waveguide (BCPW) structure is proposed. The signal line of the coplanar waveguide (CPW) has symmetrical saw-shaped structures under the MEMS bridges above which covers the BCPW bridge. The CST software is used for the modeling, simulation and optimization the model of phase shifter from 30 to 40 GHz. Simulation...
This paper describes a methodology for developing an effective electromagnetic compatibility (EMC) computer based technical support platform (TSP) system which is used for the analysis, prediction and design of system-level EMC. This computer-based TSP is integrated by EMC resource databases, specifications modules EMC design module, platform management module and EMC analysis tools. The main advantage...
In order to broad bandwidth and reduce back radiation, a novel microstrip antenna element operating at millimeter-wave band is proposed which is used H-shaped coupling slot feeding and adds parasitic patch methods. Then, using this antenna element, we design 2x2 microstrip antenna arrays and their feeding network. Comparing with traditional feeding network, H-shaped coupling slot feeding methods has...
A rectangular waveguide filled with uniaxial metamaterial is investigated in this presentation. The EM fields distribution of TE modes in such a rectangular waveguide are derived, and transmission characteristics are discussed. It is shown that the longitudinal component of the metamaterial permittivity tensor has strong influence on the direction of the phase velocity for TE mode waves. Particularly,...
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