A circularly polarized (CP) reflectarray with 2-D electronically steerable beam is reported. The reconfigurable CP element realized using a circular-patch-based structure p-i-n diodes incorporated. new electronical phase manipulation method proposed based on the rotation technique and by additionally exploiting symmetries in field distribution of element's fundamental resonant mode. Element can be equivalently achieved altering biasing voltage changing electromagnetic behavior reflective...

In this article, novel millimeter-wave (mmWave) filtennas (filtering antennas) are proposed to realize compact size and low insertion loss for 5G applications. It is achieved by employing eighth-mode substrate-integrated waveguide (EMSIW) cavities fully shielded metallized vias cover as resonators, which named EMSIW (FSD-EMSIW) cavities. Interdigital coupling between introduced in order obtain higher strength wideband operation. The single-polarized antenna consists of a feeding stripline,...

A compact multibeam endfire dual-polarized antenna array for low-cost millimeter-wave (mmWave) applications is proposed in this letter. Multimode substrate-integrated waveguide (SIW) section with interactions applied as the basic beamformer. The dual-mode SIW used beamforming network to support dual-polarization application without occupying an extra area. printed dipole integrated balun and open-ended metallic strips are realize element. Based on element, a developed. includes four-element...

The application of magnetoelectric (ME) dipole to achieve wideband and low cross-polarization transmitarray design is presented in this article. First, a novel meandering-probe-fed ME that exhibits matching, central feeding configuration, symmetrical antenna structure developed. These preferred features are borrowed address the narrowband potential element-displacement issues 1 bit element design. Numerical simulations proposed ME-dipole show wide dB insertion-loss bandwidth 47% level -40...

In this letter, a broadband and low loss circularly polarized (CP) electronically reconfigurable reflectarray antenna (RRA) that can operate over the X-band is reported. The proposed RRA invokes new magneto-electric (ME) dipole based element for dynamically manipulating phase of back-scattered CP wave from each pixel, hence, direction reflected beam. engineered wideband ME-dipole design perturbation structure contribute jointly to superior bandwidth as well high efficiency. A prototype with...

This article presents a millimeter-wave (mmWave) dual-band dual-polarized filtenna, which can achieve desirable out-of-band rejection for 5G applications. The antenna element consists of two fully-shielded quarter-mode substrate integrated waveguide (FSD-QMSIW) cavities and stacked ring antenna. Two parts are coupled through the slot on ground. completely enclosed by metal holes copper cover to eliminate radiation loss. loaded slots tune frequencies first modes in FSD-QMSIW cavity operation....

In this article, a millimeter-wave (mmWave) endfire phased array antenna with ±45° linear polarizations is proposed for fifth generation (5G)/B5G mobile communications. The achieves by utilizing modified substrate integrated waveguide (SIW) slot polarizer. polarizer generates dual orthogonal modes equal amplitudes and 0°/180° phase difference, thereby yielding <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...

A D-band low-loss mixed-mode filter with high selectivity is proposed and analyzed in this article. The transverse quintuplet/triple topology has been employed the design coupled overmode cavities using TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2N,1,0</sub> modes (N = 2,3,4, . .) -like modes. Two transmission zeros (TZs) are generated upper lower stopbands. fractional bandwidth (FBW) positions of TZs can be flexibly designed by properly...

The measured branching ratio of the $D$ meson semileptonic decay $D \to \rho e^+ \nu_e$, which is based on $0.82~{\rm fb^{-1}}$ CLEO data taken at peak $\psi(3770)$ resonance, disagrees with traditional SVZ sum rules analysis by about three times. In paper, we show that this discrepancy can be eliminated applying QCD light-cone (LCSR) approach to calculate $D\to \rho$ transition form factors $A_{1,2}(q^2)$ and $V(q^2)$. After extrapolating LCSR predictions these TFFs whole $q^2$-region,...

This letter presents a circularly polarized (CP) discrete lens with large operating bandwidth and optimized thickness. A wideband polarization-twisting unit cell, which enables the polarization agility of at pixel level, is developed using magnetoelectric-dipole-based transmissive element. By comprehensively utilizing rotation freedom probes transmitting receiving layers as well incorporating additional dielectric-coating layer, an over-2-bit CP achieved, demonstrating wide axial ratio (AR)...

The nuclear magnetic resonance (NMR) probe, one of the most important components in spectrometer, has a considerable impact on overall instrument sensitivity. By concept NMR analyzer with low-cost and portable was proposed recent years, earlier probes were not suitable for manufacture cost cycle time. So, this paper, probe based printed circuit board (PCB) planar microcoil developed time domain measurement. When Larmor frequency is 28.1 MHz, transverse relaxation T <sub...

In this article, an efficient over-the-air (OTA) calibration and pattern estimation method under the midfield (MF) condition for fifth-generation (5G) millimeter-wave (mmWave) large-scale arrays is proposed. A new transformation revision algorithm developed to calibrate antenna array fast accurate. Meanwhile, time consumed in accurate beamforming reduced significantly. The proposed requires a much smaller size anechoic chamber, fixed probe antenna, vector network analyzer (VNA)....

Transient responses of the electronic excitation and coherent soft phonon are investigated both above below ferroelectric phase transition temperature ${T}_{c}$ in ${\mathrm{Pb}}_{1\ensuremath{-}x}{\mathrm{Ge}}_{x}\mathrm{Te}$ by using an optical pump-probe technique. The mode shows large redshift heavily overdamped decay as approaching from low side, disappears ${T}_{c}$. transient response exhibits abrupt change across critical behaviors phononic dynamics interpreted transition.

A wideband antenna subarray with a hybrid feeding network is proposed for phased-array applications. The multilayer structure, where the top four-layer printed circuit board (PCB) antennas, middle two-layer metallic waveguides are interconnections, and bottom eight-layer PCB transition between active circuits. can not only improve isolation circuits but also serve as heat dispersion structure of low-loss power distribution network. Two kinds novel transitions bandpass filtering function...

In this paper, an unusual rainfall in Beijing that occurred on 4 September (‘9.4’) 2015 is studied to clarify the reasons for such a strong autumn. It was indicated various factors, including stationary westerlies disturbance (i.e. low west and high east), forward-titling trough, warm shear line, unstable stratification convective available potential energy release, level jet as well series of mesoscale systems produced rainfall. Ordinarily, situation uncommon

In this paper, two kinds of millimeter wave (mmWave) substrate integrated waveguide (SIW) cavity-fed filtenna arrays for 5G applications are presented. As a result, four-order band-pass filtering response is achieved. For demonstration, array prototypes were fabricated and measured. These cover the band (24.25 - 29.5 GHz) with measured average gains 8.2 dBi 22 dB out-of-band suppression. The proposed antennas good candidates mmWave communication.

In the rocket recovery environment, imaging conditions are complicated, and vision equipment is prone to problems such as ground target information loss, image contrast saturation reduction, color deviation so on, which directly affect solution of pose. Therefore, it necessary study de-fog algorithm for special environment recovery, contribute pose altitude measurement. Through investigation previous research on de-fogging algorithms, can be found that dark channel not only simple in...

This article presents a fully packaged 94-GHz 16-channel local oscillator (LO) phase-shifting transmitter (TX) and single-channel receiver (RX). The implementation is accomplished using hybrid integration scheme, combining high-output-power 100 nm GaAs pHEMT front-end chips highly-integrated 130 SiGe BiCMOS beamformer chips. High-accuracy LO phase shifting achieved with the utilization of commercial SiGe-based four-channel chips, offering 7-bit control at 24–28 GHz. A 26-to-78 GHz tripler...