The phase shifts of dynamic terahertz (THz) modulators based on transmissive metasurfaces are usually limited to within 180 ∘ , which is a necessary amount perform efficient wavefront modulation. Few works exhibit shift larger than 200 but with transmittance less 3% during To address this challenge, modulator using dislocation-introduced dual-layer Huygens’ metasurface (HM) embedded vanadium dioxide (VO 2 ) proposed. This compact design uniquely combines high large in broadband. Key...

We propose an uplink full-duplex (FD) cooperative non-orthogonal multiple access (NOMA) system, where a dedicated Full-duplex relay is used to help two users transmitting information the base station. A novel FD transmission mode proposed, in which utilizes successive interference cancellation (SIC) and self-interference decode symbols at receiving antenna, antenna transmits superimposed signal station using superposition coding. In this paper, we also consider more realistic scenario...

Investigating the genetic diversity and population structure is important in conserving narrowly distributed plants. In this study, 90 Clematis acerifolia ( C . ) plants belonging to nine populations were collected from Taihang Mountains Beijing, Hebei, Henan. Twenty-nine simple sequence repeats (SSR) markers developed based on RAD-seq data used analyze of The mean PIC value for all was 0.2910, indicating SSR showed a moderate degree polymorphism. expected heterozygosity whole 0.3483, both...

This study proposes a series of high step-up DC/DC converters based on the coupled inductor and switched capacitors. The priority capacitor connection methods is presented by their contributions to voltage gain so that can be selected optimally according demand. For this converter, adjusted both turns ratios number switched-capacitor units. It makes it possible further improve when ratio rather high. Moreover, introduction capacitors reduce stress power components. In study, operating...

A compact high-isolation multiple-input multiple-output (MIMO) microbase station antenna consisting of two dual-polarized elements is presented. The symmetrical magnetic coupling feeding network used to feed the radiation patch and improve isolation element. By introducing parasitic square patches, characteristics are improved. In addition, a modified closed-loop metasurface unit designed construct an wall. When assemble MIMO antenna, proposed structure inserted between them reduce elements,...

The need for effective capture of multipath energy presents a key challenge to receiver design pulsed ultra-wideband (UWB) systems operating in non-line-of-sight propagation environments. Conventional RAKE receivers can only fraction the received signal under practical implementation constraints, and have deal with stringent synchronization channel estimation requirements. Transmit-reference autocorrelation effectively collect from all components without explicit estimation, but detection...

This paper considers signaling schemes for heterogeneous ultrawideband communications networks that contain both coherent (rake) and transmitted-reference (TR) receivers. While receivers are capable of receiving TR signals, they do so with a 3 dB penalty, because cannot make use the energy invested into reference pulse. We propose new scheme avoids this drawback, by encoding redundant information on The resulting does not affect operation receiver, while recovering penalty furthermore...

We analyze a prerake diversity combining scheme for pulsed ultrawideband systems to shift signal processing needs from the receiver transmitter. consider realistic case that received pulses carrying same transmitted symbol could overlap with one another in optimizing based on zero-forcing and eigenanalysis techniques. show presence of interpulse interference caused by pulse overlapping, optimum sense maximizing signal-to-noise ratio derived using technique performs as conventional rake...

Abstract This letter presents a design method of resistance reactance hybrid continuous power amplifier based on reconfigurable devices and CG2H40010F. The combines resistive‐reactive inverse F‐class (RRIFPA), J‐class (RRJPA), F class (RRFPA). We utilize the principle low‐pass filters to control impedance multi‐frequency harmonics, use device SMP1345‐079LF expand bandwidth amplifier. article designs produces 1–4 GHz broadband simulation measurement results show that within entire frequency...

Efficient capture of multipath energy is one the most significant problems pulse-based ultra-wideband (UWB) systems in non-line-of-sight propagation environments. The traditional RAKE receiver could practically only a small fraction received signal because tracking and estimation large number components are very challenging. transmitted-reference schemes effectively collect all components, but efficiency data rate drop significantly required pilots. In addition, use noisy template waveform...

We analyzes the prerake diversity combining schemes for pulsed ultrawideband (UWB) systems to shift signal processing needs from receiver transmitter. consider more realistic case that received multipath pulses could overlap with one another and its optimization based on zero-forcing eigenanalysis technique. show in presence of inter-pulse interference, optimum linear scheme sense maximizing SNR performs same as a conventional rake maximal ratio combining. Since UWB it is important effects...

A Doherty power amplifier, using a pair of coupled lines loaded by capacitor, is proposed for linearity improvement. The conventional λ/4 transmission line substituted capacitor-loaded to perform impedance inversion, and compensate phase delay. At the same time, structure also utilized suppress second higher order harmonic output main amplifier. Furthermore, distortion peak amplifier at high level can be corrected tuning lines. Compared PA, third-order intermodulation PA reduced 23 dB.

In impulse radio ultra-wideband systems, multipath delay may cause received pulses to overlap with each other. Pulse overlapping causes inter-pulse interference (IPI) which may, especially in dense environments, severely limit the system performance. this letter, we build a mathematical model pulse considered and derive an optimum minimum mean-square error (MMSE) receiver. A simpler RAKE receiver is take samples for perform maximal ratio combining (MRC) by ignoring IPI. We then show,...

This paper presents a novel accurate and stable current charge integral equation (CCIE) solver for the low-frequency scattering of penetrable objects in layered medium (LM). To best our knowledge, this is first time to extend CCIE into LM simulations at low frequency. In order integrate matrix-friendly Green's functions (LMGFs) CCIE, we have rederived them define new quasi-vector/scalar potentials, which are able annihilate frequency singularity original LMGFs. Moreover, an effective...

This article presents a new type of double stator swing rotating permanent magnet spherical motor (DSSRPMSM), which can realize swing, rotation, and helical motion is used in industrial robots, gyroscopes, satellite communications, other fields. The proposed consists two stators hollow rotor with (PM) poles on its inner outer surfaces. Compared most coil traditional PM synchronous motor, the structure different novel, it difficult to find more perfect design theory method. Thus, this...