The direct control for the bearingless permanent magnet synchronous motor (BPMSM) has problems of large ripples of flux linkage, torque, and suspension force due to sampling time delay. To solve above problems, a predictive direct control method is proposed based on the traditional direct control by adding prediction model. Firstly, the generation principle of radial suspension forces of the BPMSM is introduced. Secondly, the models of the predictive direct control method are given based on the traditional direct control, and the time-delay compensation model is deduced. Thirdly, the predictive direct control system is constructed, and the simulations are carried out. Finally, the proposed control strategy is applied to a prototype, and the related experimental results are given and analyzed. The results of the simulations and experiments show that compared with the traditional direct control of the BPMSM, the predictive direct control strategy can effectively reduce the ripples of flux linkage, torque, and suspension forces, and improve the static and dynamic performance of the BPMSM.

This paper develops a circuit theory on bandpass negative group delay (NGD) topology. The NGD active lumped circuit uses a low noise amplifier (LNA). An S-parameter model is formulated. Unfamiliar, NGD function analysis is introduced by analytically defining the NGD value, bandwidth, and central frequency in function of the topology parameters. The synthesis formulas enabling the calculation of cell parameters as a function of the targeted bandpass function specifications. To validate the circuit theory, an NGD proof of concept (PoC) is designed, simulated and tested. As expected, simulations and measurements are in good agreement. Calculated model, simulated and measured results showing NGD level of about -10 ns around the centre frequency 0.5 GHz over the bandwidth 50 MHz validate are obtained.

A new numerical method is proposed for uncertainty quantification in the two-dimensional finite-difference frequency-domain (FDFD) method. The method is based on an intrusive polynomial chaos expansion (PCE) of the Helmholtz equation in terms of the material properties. The resulting PCE-FDFD method is validated against Monte-Carlo simulations for an electromagnetic scattering problem at 1.0 GHz. Good agreement is found between the statistics of the electric fields computed using the proposed method and the Monte-Carlo results, with a factor 15-120 reduction in the computational costs. The PCE-FDFD method is also applied to estimate the material properties from exterior measurements by formulating an objective function and applying constrained optimisation techniques. A maximum 1.7% error in the material properties was observed for a test geometry with six unknowns and 20 sample points.

This paper proposes a method to recover vibration energy from a semi-active suspension system which is composed by a magneto rheological damper in parallel with a power regeneration mechanism. Central to the concept is a parity-time-symmetric (PT symmetric) circuit that is capable of providing high efficiency transmission of power and minimizing electromagnetic damping force of the power regeneration mechanism. Simulation results are presented to demonstrate the electromagnetic damping force of the power regeneration mechanism having little impact on suspension system and verify the possibility of energy recovery. The proposed control strategy pays close attention to inertial force of the power regeneration mechanism which produces indicator diagram hysteresis. To evaluate the performance brought about by the proposed method, the semi-active suspension utilizing the PT symmetric circuit is compared to the load resistance circuit. And the semi-active suspension system is implemented on a quarter car test bench to demonstrate its feasibility on a typical sine road surface.

Dynamic Wireless Power Transmission has attracted attention in the research area due to its safety, convenience, and automation. However, the major limitation in achieving this vision is its working distance. In this paper, the metamaterial (MM) based transmitter WPT with zero permeability is presented and compared with an inductive WPT system. The comparative simulations and experimental investigations validate the effectiveness of the proposed design. The system efficiencies are determined at the distances of 8 cm, 11 cm, and 16 cm between the transmitter and receiver (SAE J2954) with an operating frequency of 20 kHz. The power transfer efficiency (PTE) of the WPT system using an inductive transmitter and the WPT system using an MM-based transmitter is shown as 85/87%, 65/70%, 45/65%, respectively. The PTE of the MM-based transmitter is 64% higher than an inductive transmitter at a 16 cm distance. The robot without a battery moves dynamically along the track with the MM-based transmitter underneath. The results show that the power transfer efficiency of the MM-based transmitter is considerably higher than that of the inductive transmitter.

A low-loss electronic beam steering model is presented in this paper based on tightly-coupled dipole array topology for satellite communications applications for K through Ka-band (18-40) GHz. The array is low-profile having < 3.4 mm height and printed on an affordable single-layered PCB. As proof-of-concept, a 4 × 4-element, single polarized array is fabricated and measured showing (18-40) GHz (VSWR < 2) continual band coverage. A compact, low-loss electronic beam steering architecture for moderate bandwidth arrays is also utilized for beam steering. A 2-bits tunable phase shifter, spanning over (18-30) GHz with IL < 2.5 dB, is developed using micro-electro mechanical systems (MEMS) technology. The phase shifter is integrated at the array elements resulting in reduced size, cost, and complexity of the feeding network. A full-wave simulation of the 4 × Infinite array with the integrated MEMS phase shifter is conducted to prove the concept.

The method of evaluating the resonant frequencies of a multilayered cylindrical resonator containing uniaxial anisotropic materials is presented. The detailed solution of Maxwell's equations for such a structure by means of the radial mode matching method is given. The results of calculations using developed and launched computer program are given, and they are compared with those obtained by other methods and with measurements. These results are in close agreement, which proves the correctness of the method. The developed solution and the software program can be used to measure the permittivity tensor of materials.

The traditional electromagnetic wave wireless communication in the underground environment has the problem of unstable channel path loss, large antenna size, high path loss, etc. To address these issues, the channel models of magnetic induction communication and magnetic induction waveguide communication based on quasi-static field coupling are proposed, and the characteristics of magnetic field strength, path loss, bandwidth, and channel capacity are analyzed in detail. The results show that the magnetic induction communication system channel is stable, compared with the ordinary induction communication, and the path loss of magnetic induction waveguide communication is reduced a lot, even in the case of high noise and transmission distance increased by more than 20 times. But the bandwidths of the two ways are small and similar. The path loss and bandwidth decide the system capacity, and system capacity is also affected by the number of turns, working frequency, coil resistance, and size.

In this paper, a metasurface superstrate-inspired broadband circularly polarized (CP) printed monopole antenna is investigated. To achieve broadband circular polarization and directional radiation pattern, a circle-shaped monopole radiator with asymmetrical staircased partial ground loaded with metasurface is introduced. It is fed by a 50-Ω microstrip feedline and is fabricated on an FR-4 substrate, having overall dimension of 1.25λ₀ × 1.66λ₀ × 0.02λ₀ at f = 5 GHz. The metasurface antenna exhibits a measured impedance bandwidth of 5 GHz (1.85-6.85 GHz, 114.9%), axial bandwidth of 910 MHz (4.09-5 GHz, 20.02%) with average CP antenna gain of 6.82 dBic, directional radiation pattern and consistent antenna efficiency of > 85.65% in the desired frequency bands. Time domain characteristics i.e. group delay is obtained within 2 ns in the operating frequency bands. Due to its design process and attainment of broadband CP, higher antenna gain and directional radiation pattern in the broadside direction, it is extended for RF energy harvesting. The proposed metasurface antenna is integrated with a rectifier circuit, where RF-to-DC conversion efficiency (η₀) and DC output voltage (V_out) are analyzed by using ADS circuit solver.

In this communication, conceptual design guidelines for a tri-band dual sense circularly polarized ceramic-based antenna is explored. An asymmetrical S-shaped aperture is used to stimulate the ring-shaped ceramic. Some exclusive features are obtained in the designed antenna: (i) creation of five different hybrid modes (HEM_11δ, HEM_11δ+2, HEM_12δ-like, HEM_12δ, and HEM_13δ) is helpful for getting dual wideband impedance bandwidth; (ii) proposed aperture assists in achieving CP waves in three different frequency ranges with two different senses. Its experimental results confirm the simulated outcomes. The proposed antenna is operated within the dual-frequency ranges i.e. 2.2-4.19 GHz and 4.74-6.11 GHz, respectively. The measured 3-dB axial ratio is achieved in three different frequency ranges within the operating band i.e. 2.71-2.98 GHz, 3.6-3.79 GHz, and 5.5-5.81 GHz, respectively. The proposed antenna design is left-handed circularly polarized (LHCP) in the first and third frequency ranges, while it is right-handed in the second one. These features, along with broadsided far-field patterns, recommend the proposed antenna design for potential application in WLAN (2.4/5.5 GHz) and WiMAX (3.3/5.0 GHz) wireless networks.

A wearable, miniaturized, dual-band, Artificial Magnetic Conductor (AMC) integrated antenna operating on ISM band (2.38-2.47 GHz) and WLAN band (5.11-5.31 GHz) is proposed for Wireless Body Area Network (WBAN). A dumbbell shaped unit-cell is designed to achieve zero reflection phase and modified material characteristics. When 2×2 array of dumbbell shaped AMC is put underneath the monopole, the antenna gain increases up to 9.5 dB and 8.1 dB at 2.43 GHz and 5.2 GHz respectively. Different bending conditions have been considered to confirm the robustness of the AMC antenna. Debye model is used to approximate the dielectric properties within phantom tissue model. Antenna shields most of the backward radiation and reduces the specific absorption rate (SAR) of the integrated antenna by more than 95% in 1-g of phantom hand tissues at both the frequencies. The acquired results exhibit that the AMC antenna is more secure for on body applications.

The suppression of crosstalk by combining the defected microstrip structure (DMS) with step-shaped transmission lines is proposed to address the problem of crosstalk between microstrip lines of the printed circuit board. This method suppresses the crosstalk between the microstrip lines by constructing two step-shaped coupled microstrip lines and etching the designed G-shaped DMS on one of the microstrip lines. Simulation and actual measurement results show that the combination of G-shaped DMS and step-shaped transmission line can effectively suppress crosstalk and reduce the far-end crosstalk by approximately 20 dB in the frequency range of 4-5 GHz. The actual measurement results in the vector network analyzer coincide with the high-frequency structure simulator simulation results.

In this paper, the gain flattening of a wideband Fabry-Perot cavity (FPC) antenna, using truncated partially reflecting surface (PRS) and slotted elliptical and rectangular shape artificial magnetic conductor (AMC) layers is proposed. FPC is fed using a metal plated microstrip antenna (MSA) which comprises three layers-elliptical slotted rectangular AMC-I layer, truncated PRS layer, and rectangular slotted elliptical AMC-II layer. AMC-II layer is designed complementary to AMC-I layer to obtain gain variation < 1dB over wide frequency band. Elliptical shaped AMC-II and truncated PRS reduce the reflected fields towards ground and thus improve front to back lobe ratio (F/B) and side lobe level (SLL). These layers resonate at higher frequency and thus reduce gain variation and couple electromagnetically with MSA and AMC-I layer to provide wide bandwidth (BW). The proposed antenna provides S₁₁ < -10 dB, 17.2 dBi peak gain with gain variation < 1.2 dB over 5.7-6.4 GHz frequency band, which covers 5.725-5.875 GHz ISM and 5.9-6.4 GHz satellite uplink C band. Broadside radiation patterns have SLL < -19 dB, cross polarization (CPL) < -17 dB, and F/B > 20 dB with wide 3 dB gain BW of 15.2%. The overall antenna dimensions are 2.3λ₀x2.75λ₀x0.5λ₀, where λ₀ is the free space wavelength corresponding to 5.8 GHz, central frequency of ISM frequency band. The measured results of the prototype fabricated structure agree with simulation ones.

After a thorough investigation, this paper introduces a novel and simple radiofrequency material characterization technique. For this study's purposes, two probes were developed and separated by the sample under test (SUT) with an inhomogeneous test cell. Furthermore, the discontinuity impacts at the probe, SUT interfaces, were also studied. The investigation uses the transmission process through the principle of two different SUT thicknesses to measure its relative permittivity and loss tangent. The technique is based on using the lumped elements of an equivalent circuit of the entire test cell and covers 1 MHz-2 GHz. With the SUT, placed between two metal probes and another metallization, placed under its thickness on an opposite side to improve the loss tangent acquisition level, the cascading chain matrix (CCM) is used to get the final parameters. The thickness changing makes it possible to overcome the contact interface effects probe-sample. A mathematical model has also been presented through the fitting procedure. The new technique has been validated with three materials: Rogers RO4003C, FR-4 HTG-175, and Alumina 99.6%. The SUT complex relative permittivity extraction makes the new approach suitable for the telecommunication industry and many others. The method is also ideal for materials with thickness sizing up to 3 mm around.

A composite right/left-handed (CRLH) leaky wave antenna (LWA) using double mushroom-like structures is proposed. With a proper arrangement of the left-handed structures, desirable cross-polarization performance in two orthogonal planes can be obtained based on the differential excitation principle. The CRLH performance of the cascaded LWA is demonstrated, and its improved radiation performance is clarified. Measured results indicate that the proposed antenna operates in 9.7-16.4 GHz with a beam scanning range from -71° to +31°. The cross-polarization levels are less than -30 dB and -20 dB in the beam scanning plane and non-beam-scanning plane, respectively.

Metamaterials have revolutionized the research in conventional electromagnetics. They display unique properties which can be used for the manipulation of electromagnetic waves in unexpected ways. In this research, a diamond nano-antenna is designed and optimized using the CST Microwave Studio, which uses Finite Difference Time Domain (FDTD) method. The designed unit cell shows high polarization conversion rates (PCR) for ultraviolet (UV) frequencies (especially the UV-B band) whilst covering Panchatram-Berry (PB) phase. The unit cell is then used to design metasurfaces that generate light beams carrying Orbital Angular Momentum (OAM) of different orders. Through the design of two dimensional metamaterial surfaces, the behavior of electromagnetic beams can be changed on sub-wavelength scale. This has led to a number of applications related to nanotechnology. A vortex beam carries Orbital Angular Momentum (OAM) which has played a vital role in increasing the bandwidth and data rate of optical communication systems. Therefore, OAM beams having different topological charges have been generated at 294 nm to propose an improvement in Free Space Optical (FSO) communication. Optical links also function as a suitable substitute for applications where Radio Frequency (RF) communications may not be effective. The proposed theoretical model is expected to open new horizons in optical communication by incorporating the use of nanoscale devices with high efficiencies in the ultraviolet regime.

This paper presents a recent progress in a millimeter-wave imaging done with a potential 5G base-station phased-array antenna exhibiting frequency-diverse, non-focused beams. The presented imaging system operates in 24-32 GHz band and is the first realization where phased arrays primarily developed for 5G communications are utilized in a frequency-diverse imaging application. The image reconstruction method solves the linear inverse problem with an iterative algorithm, and several images have been reconstructed based on the measurement data. Currently, a metallic sphere can be successfully located in the target space. However, future work is still required, and the paper further discusses the possibilities and restrictions of the current imaging setup.

Due to the nonuniform Electromagnetic (EM) field distribution over the superstrate, a Fabry-Perot Resonant Antenna is normally with high directivity but relatively low aperture efficiency when its aperture size is electrically large. In this paper, a Fabry-Perot resonator cavity antenna (FPCA) with a nonuniform metamaterial superstrate is proposed. The nonuniform metamaterial superstrate is a nonuniform double-sided printed dielectric, in which the upper surface is used for wideband RCS reduction, and the bottom surface is the nonuniform partially reflective surface (PRS) of FPRA for wideband and high aperture efficiency performances. Wideband RCS reduction is realized by designing the phase differences 90˚ in turn among three adjacent frequency-selective surfaces. The wideband 3 dB gain bandwidth and high aperture efficiency performances are obtained by designing the PRS with a positive reflection phase gradient vs frequency and a negative transverse-reflection magnitude gradient, respectively. The measured results show that the gain of the proposed antenna is 11.5 dBi greater than that of the primary source antenna with a peak value 15.5 dBi at 9.2 GHz. The aperture efficiency is 73.3%. The 3-dB gain bandwidth is from 8.75 to 11.47 GHz (26.9%), and the RCS reduction can be obtained effectively from 8.2 to 20 GHz (83.7%).

A compact broadband folded dipole antenna element with a ball grid array packaging is proposed in this letter. The compact antenna element is fabricated on a low-cost FR4 substrate consisting of only one dielectric layer. The solder balls are mounted on the square ground metal plane of the antenna element to form the ball grid array (BGA) packaging, which allows the antenna element to be surface mounted with other surface-mount devices (SMDs). Furthermore, ball grid array packaging has great potential for minimizing the size of antenna elements. The dimension of the proposed antenna element is only 6 mm × 6 mm × 1.6 mm. Parameter analysis shows that the solder balls have little effect on antenna performance. The proposed folded dipole antenna element is fed by a 50 Ω grounded coplanar waveguide (GCPW) transmission line on the evaluation board. The antenna prototype has been designed, analyzed, and manufactured. Measured results of the prototype show that the -10 dB impedance bandwidth is 45.4 % (22.3-35.4 GHz), and the peak gain achieves 6.62 dBi at 35 GHz. The measurement results show that the proposed antenna element has great potential for the 5G millimeter wave application.

In this paper, a miniature folded dipole is proposed for designing a metal-mountable UHF RFID tag. The proposed tag antenna is low in profile and it has a compact size of 40 mm × 40 mm ×3.1 mm (0.12λ × 0.12λ × 0.009λ). Folding the dipole arms into a two-fold rotational symmetrical style can miniaturize the tag footprint for achieving high compactness. It has been found that the capacitive coupling mechanism between the rotational symmetrical radiating arms is effective in enhancing the vertical radiation, which subsequently improves the achievable read distance in the boresight direction. Also, an incorporated circular loop can provide additional inductance for achieving good impedance matching with the RFID chip. For the proposed tag antenna, a full ground plane is inserted underneath the radiator for isolating it from the backing metal, making the tag tolerant to the metallic platform. The proposed tag antenna is able to achieve a maximum read distance of 7 m at 4 W EIRP when it is tested on metal.