A novel ultrawideband energy-selective surface (ESS) in <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">S-</i> band is presented for adaptive high-power microwave (HPM) protection. Periodic metallic textures are designed and loaded with pin diodes to obtain the nonlinear response, which dependent on power intensity of incident wave. After equivalent circuit analysis full-wave simulation, a prototype fabricated, experiments conducted under...

In this article, a wideband energy selective surface (ESS) with quasi-elliptic response and high shielding effectiveness is proposed for providing out-of-band rejection high-power microwave protection at the same time systems. By cascading three layers of structures loading diodes, nonlinear transmission property are realized. The ESS has wide pass-band simultaneously turned <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> diodes under...

This article presents a detailed circuit analysis of energy selective surface (ESS), which adaptively protects electronic equipment from high-power microwaves (HPMs) thanks to its self-actuated response and nonlinear transmission feature. With the help equivalent model (ECM), four types ESS schemes are individuated two them analyzed in detail explore influence ECM parameters on performance ESS. Then, high-performance is designed through proposed method. The structure realized by metal...

This article presents how to design multiband energy selective surface (ESS), which has a nonlinear transmission response the power of incidence in multiple frequency band. It is demonstrated that ESSs with an arbitrary number operating bands could be obtained both parallel and serial LC resonance circuits each single band modulated from passband low insertion loss (IL) stopband high shielding effectiveness (SE). Furthermore, dual-band ESS designed verify proposed methods, two rectangular...

This article presents a detailed analysis of the response threshold energy selective surface (ESS) based on semiconductors. ESS could adaptively protect electronic equipment from high-power microwave (HPM) when field intensity incident waves surpasses threshold, at which semiconductors loaded are triggered by induced voltages or currents. The effects various design parameters and implied physical mechanism investigated using electromagnetic simulations experiments. With help...

A broadband switchable absorber from S-band to C-band is presented in this letter. The proposed structure composed of three layers separated by air gap. From top bottom, the double split rings with lumped resistors, cut metal wires connected p-i-n diodes and ground, are integrated realize absorption, switching feasibility, independent polarization. For demonstration, investigated using a circuit analogy method, distributions surface current also discussed detail analyze mechanism absorption....

This article presents an adaptive high-impedance surface (A-HIS) that can be applied in the prevention of high-intensity wave propagating <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$X$ </tex-math></inline-formula> -band waveguide. Once embedded diodes loaded on A-HIS are switched from OFF- to ON-states by incident wave, boundary condition waveguide's bottom wall would adaptively change a perfect...

A self-switchable broadband waveguide protector against high power microwave (HPM) is proposed in this letter, which can react to the intensity of an incident wave adaptively. The composed three metal layers with multiresonance characteristic and four PIN diodes are loaded. It realize HPM protection a wide frequency range. An equivalent circuit carried out interpret working mechanism protector. Then, prototype WR90 designed simulated. results simulation show that low signal propagate through...

Abstract This paper presents a method to design the response threshold (RT) of energy selective surface (ESS) based on series LC circuits (SLC_based_ESS). A simple SLC_based_ESS structure composed metal strips and PIN diodes is used for demonstration. According our research, RT rarely related geometry parameters unit cells. By contrast, could be designed by introducing auxiliary structures (ASs) arrays. With AS, induced currents are enhanced thus greatly reduced. Prototypes fabricated...

We consider a two-way communication assisted by parallel regenerative decode-and-forward relays operating in orthogonal channels. In system with limited channel state information at each source and relay node, an optimum distributed power allocation strategy is proposed to minimize the total transmit power, providing target signal-to-noise ratio destination outage probability. Moreover, combined opportunistic relaying network coding, decision mechanism for node decide whether help...

In a multi-user MIMO downlink system, due to the limitation on number of transmit antennas, we consider employing zero-forcing beamforming (ZFBF) and oblique projection (OPBF) as spatial multiplexing strategies when there are many users be supported simultaneously. Based analysis ZFBF OPBF, show these various linear transmitter designs that offer low complexity high performance for practical application, mitigating co-channel interference.

An ultra-wideband bandpass frequency selective surface with a three-layer structure is designed. A multilayer coupling approach used to design the metal patch and Jerusalem cross grid in layers. Full-wave simulation results show that -3dB bandwidth of extends from 8.9GHz 36.1GHz, reaching an absolute 27.2GHz relative 121%. In addition, such FSS has advantage low profile, flat passband stable performance at various incidence angles. operating range, maximum loss less than 0.6dB for...

As a promising approach for optical nonreciprocity without magnetic materials, optomechanically induced has great potential all-optical controllable isolators and circulators on chips. However, as very important issue in practical applications, the bandwidth nonreciprocal transmission with high isolation not been fully investigated yet. In this study we review Brillouin optomechanical system single cavity point out challenge achieving broad isolation. To overcome challenge, propose one...

Based on decode-and-forward strategy, we investigate the achievable outage probability of opportunistic relaying, in which there is a single source-destination transmission pair with help one multiple relays. In two-hop scenario, based adaptive decode-and forward diversity-multiplexing tradeoff knowledge channel state amplitudes analyzed. We show that relaying has same as distributed space-time coding. then present expression closed form and find suboptimal power allocation for...

We consider a source-destination pair assisted by multiple decode-and-forward relays without channel state information at transmitter (CSIT). investigate three schemes exploiting spatial diversity including multiple-relay cooperation (MR-Coop), conventional relaying (MR-Relay), and multiple-input-single-output (MISO). The total power is equally allocated to transmission partners the knowledge of CSIT. Moreover it practical for decide whether or not assist with receiver (CSIR). then deal...

To satisfy future demands of wireless systems, one key technologies is to improve the robustness transmission. In this paper, three cooperative schemes are proposed with antennas sharing among multiple nodes achieve diversity in networks. The could be applied two practical relay scenarios which each node has antenna or respectively. simulations show that these can better performance combat channel corrupt. And techniques communications.