We experimentally demonstrate that an ultrathin metallic spiral structure is able to support multiple high-order magnetic localized spoof surface plasmons (LSSPs), which were absent in previously reported LSSPs. Near-field response spectra and near-field mapping are performed the microwave regime confirm this phenomenon. also show LSSPs more sensitive surrounding refractive index change than dipole mode. Our study may be useful electromagnetic sensing from infrared frequencies.

Abstract Transport of subwavelength electromagnetic (EM) energy has been achieved through near‐field coupling highly confined surface EM modes supported by plasmonic nanoparticles, in a configuration usually on two‐dimensional (2D) substrate. Vertical transport similar along the third dimension, other hand, can bring more flexibility designs functional photonic devices, but this phenomenon not observed reality. In paper, designer (or spoof) plasmon resonators (‘plasmonic meta‐atoms’) are...

Magnetic localized surface plasmons (LSPs) supported on metallic structures corrugated by very long and curved grooves have been recently proposed demonstrated an extremely thin spiral structure (MSS) in the microwave regime. However, mode profile for magnetic LSPs was measuring only electric field, not field. Here, based Babinet's principle, we propose a Babinet-inverted, or complementary MSS whose electric/magnetic profiles match magnetic/electric of MSS. This complementarity allows...

Backward waves with wave‐front propagation opposite in direction to that of energy flow have attracted considerable interest the context photonic metamaterials. However, switching between forward and backward same frequency range has remained a challenge. Here, on platform coupled designer surface plasmon resonators microwave regime, multiband forward/backward plasmonic wave is demonstrated. This approach makes use sign‐reversal coupling occurs when configuration tightly confined modes....

Microbial nitrogen fixation presents a viable alternative to chemical fertilizers, yet the limited colonization and specificity of naturally occurring nitrogen-fixing microorganisms present significant challenges their widespread application. In this study, we identified gene cluster (VNnif) in Vibrio natriegens (VN) tested its nitrogenase activity through acetylene reduction assay. We investigated potential utilization by incorporating from VN into plant growth-promoting rhizosphere...

Vector beams, featured by a specific space-variant distribution of polarization, have attracted intensive attention. Arbitrary and broadband spatial polarization processing is key pursuit for vector beam generation, modulation, detection. Here, we introduce black dye into liquid crystals to form dichroic medium imprint high-resolution patterns the via photopatterning. Continuous cylindrical binary beams are freely generated. Switching between generator high-transmittance homeotropic state...

Polyvinylidene fluoride (PVDF) films are widely used in sensors for their wide response frequency, good flexibility, low acoustic impedance, and chemical stability. In this work, PVDF/CaCl2 piezoelectric were prepared by an electro-assisted 3D printing method to form a multi-layer composite film sensor. The study found that the addition of CaCl2 can effectively increase β-phase content PVDF improve dielectric properties sensors. When is 0.15 wt.%, reach highest value up 48.47%, output...

This letter presents a convenient approach based on the two-port <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$kQ$ </tex-math></inline-formula> -product theory to analyze influence of interwinding capacitive coupling efficiency transformer. It is demonstrated that transformer with proper size can benefit from maximize its at desired frequency. The proposed design used in notation="LaTeX">$W$ -band...

A broadband programmable gain amplifier (PGA) for wireless communication is presented in this paper. The PGA carried out by improved parallel feedback based flipped voltage follower (FLV) to achieve wide dynamic range of gain, bandwidth, as well low noise and high linearity. It implemented with a topology consisting three coarse adjustment stages cascaded fine control stage. chip also includes novel analog DC-offset calibration (DCOC) units digital serial peripheral interface (SPI) generate...

This paper presents a wideband CMOS LC voltage controlled oscillator (VCO) with switched current source for 3.4-3.6GHz IMT-Advanced and 4.1-4.8GHz UWB applications. Reconfigurable tank switch control is adopted to accomplish dual band operation selection. The LC-VCO fabricated in TSMC0.13μm process, fully evaluated on wafer. Bias filters are used this design suppress reference noise bias line dynamic transient effects. Voltage supplied by 1.2V, the VCO consumes of 3mA at 4.5mA band. measured...

This paper presents a Ku-band fractional-N frequency synthesizer with adaptive loop bandwidth control (ALBC) to speed up the lock settling process and meanwhile ensure better phase noise spur performance. The theoretical analysis circuits implementation are discussed in detail. Other key modules of such as broadband voltage-controlled oscillator (VCO) auto calibration (AFC) programable divider/charge pump/loop filter designed for integrity flexible configuration. proposed is fabricated 0.13...

We present a fully-integrated 256 QAM single-chip transceiver (TRX) with 300-MHz channel bandwidth at the 6.5-GHz band. A novel architecture for self-interference suppression (SIS) is proposed. noise-canceling low-noise amplifier embedded programmable source degeneration network based on bond wires, manifesting notch filtering characteristics of signal, has been utilized to facilitate SIS, and LC-tuned tanks further improve interference in receiver (RX) considerable adjacent leakage power...

A low power consumption, high-speed and wide division ratio range programmable frequency divider designed in 0.18 μm SiGe process is presented. The circuit consists of 4/5 dual-modulus prescaler, 5-bit subtraction counter control logic. combination D flip-flops logic gates effectively reduces the transmission delay improves operating prescaler. pulse swallow are merged into one, which chip area. novel adopted to reduce minimum by allowing S value equal 0. whole composed TSPC...

An automatic frequency calibration (AFC) for wide-band synthesizers is presented in this paper. To achieve low phase noise, 6-bits switched-capacitors banks are employed the VCO. The whole AFC working under control of reference clock to overcome competition adventure that may caused by asynchronous sequential. One extra comparison used finally determine optimum sub-band. Simulation result shows ensures synthesizer lock at linear range charge pump. simulated setting time 19.2us worst case....

Abstract We present a 2.4‐6 GHz 6‐bit vector‐sum phase shifter with full 360° phase‐shift range based on 65‐nm CMOS technology. This paper exploits an improved reconfigurable quadrature all‐pass filter cross‐coupled buffer as the generator circuit, and common‐gate programmable gain stage optimal transistor size ratio in‐phase/quadrature (I/Q) I/Q variable amplifiers (VGAs). Through optimization of circuit topologies, superior overall performance has been achieved extremely low root mean...

Abstract This paper presents a novel ultra low jitter phase‐locked loop (PLL) circuit architecture for RF Sampling Transceiver. The programmable frequency divider with duty cycle expansion and the new phase detector charge pump are used to solve problem of voltage domain conversion narrow pulses in traditional high‐performance PLL structure. structure degrades linearity noise, thus deteriorating overall performance. Furthermore, voltage‐controlled oscillator uses dual core second harmonic...

Abstract An optimized millimeter-wave digital controlled oscillator (DCO) in a 40-nm CMOS process is presented this work. The coarse-tuning modules and medium-tuning of the DCO utilize modified binary-weighted digitally transmission lines (DCTLs) to achieve better compromise among smaller chip size, higher resonant frequency, tuning resolution lower phase noise. precision die size medium bank are improved without changing binary coding rules by replacing lowest-weight bit DCTLs with switched...

This paper presents a wideband inductorless noise-cancelling balun LNA with two gain modes, low NF, and high-linearity for LTE intermediate-frequency-band (eg. 3.3-3.6GHz, 4.8-5GHz) 5G applications fabricated in 65nm CMOS. The proposed is bonding tested exhibits minimum NF of 2.2dB maximum IIP3 -3.5dBm. Taking advantage an off-chip bias inductor CG stage cross-coupled buffer, the occupies high operation frequency up to 5GHz remarkable linearity as well compact area.

An analytical procedure is presented to evaluate the fluid sloshing characteristics in a two-dimensional (2D) rectangular container with bottom-mounted T-shaped baffle. The region divided into several sub-domains hypothetical interfaces and velocities pressures of on adjacent should be identical. separation variables conjunction superposition principle employed formulate velocity potential each sub-domain. Fourier series expansion used derive eigenvalue equation by substituting solutions...

In this paper, we propose a two-step time-to-digital converter (TDC) using gated delay technique to reduce power consumption. To consumption technology turns the chain off when arbiter is not sampling. Simulation results show that TDC resolution can reach 7ps fabricated in 28 nm CMOS process, and reduced by 60% compared conventional TDC.

This letter presents a hybrid series-shunt LC tank matching technique, which constructs an imaginary-impedance part for impendence (power) and cancels the deviations caused by aggravated load parasitic effects in millimeter-wave (mm-wave) high-frequency band, allowing broadband simultaneous noise impedance (BSNIM) mm-wave CMOS low-noise amplifier (LNA). The proposed network has been synthesized into triple-coupled transformer-based further to enable compact robust solution differential...