Abstract Shape‐programmable soft materials that exhibit integrated multifunctional shape manipulations, including reprogrammable, untethered, fast, and reversible transformation locking, are highly desirable for a plethora of applications, robotics, morphing structures, biomedical devices. Despite recent progress, it remains challenging to achieve multiple manipulations in one material system. Here, novel magnetic memory polymer composite is reported this. The consists two types particles an...

Reconfigurable antennas offer attractive potential solutions to solve the challenging antenna problems related cognitive radio systems using ability switch patterns, frequency, and polarization. In this paper, a novel frequency reconfigurable E-shaped patch design is proposed for possible applications in systems. This paper provides methodology with microelectromechanical system (RF-MEMS) switches particle swarm optimization, nature-inspired optimization technique. By adding RF-MEMS...

The simplicity and intuitive design of traditional circularly polarized (CP) patch antennas, such as the truncated corner antenna, has led to their widespread popularity. However, they are limited a narrowband performance on order 0.1%-2% for simultaneously good S11 axial ratio (AR). We will prove theoretically that this is direct result probe reactance hindering use thicker substrates increase bandwidth. Furthermore, we propose novel compensation technique enhance bandwidth capabilities...

A novel broadband RHCP/LHCP reconfigurable patch antenna array using an E-shaped element is investigated. By applying particle swarm optimization (PSO), a challenging, combined S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> -AR bandwidth of 17% was achieved and verified through measurement for the isolated MEMS switches at overall substrate thickness 0.092λ xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> . The significantly higher...

This paper summarizes the primary features inherent in current optimization methods typically applied to antenna designs and demonstrates their effectiveness by applying particle swarm (PSO), a nature-inspired global technique, novel design solutions wireless communications. The concept of PSO technique is briefly introduced an outline important parameters that are utilized summarized. Next, implementation strategy combining with numerical algorithms for electromagnetic solutions, namely...

A two-pole half-mode substrate integrated waveguide (TIMSIW) cavity-based filtering antenna is presented. The TIMSIW cavity used as a radiating resonator with conventional (SIW) functioning highQ of the filter, leading to its compact size. concept source-load coupling introduced for antennas, which allows presence two controllable transmission zeroes (TZs) in frequency response proposed design. This accomplished by using electric between cavities and combination microstrip/coaxial line feed...

Supporting circular polarisation in single‐layer, single‐feed, compact patch antennas is a challenging task, especially when improved bandwidths are required. The difficulty lies simultaneously obtaining good axial ratio (AR) and impedance matching performance over the required bandwidth. Several broadband,thick‐substrate circularly polarised (CP) designs have appeared literature, but their complex fabrication might not be suitable for harsh environments requiring mechanical simplicity or...

The emergence of CubeSats has opened up the possibilities advanced space missions with lower costs and faster development times. A major factor that limits functionality is absence high-gain antennas (HGAs) can sustain a high data-rate link for communications or provide required spatial resolution remote sensing. In this work, we discuss one largest apertures at Ka-band CubeSats-a 1 m mesh deployable offset reflector antenna, stowed volume 3U (10× 10 × 30 cm <sup...

In article number 1906657, H. Jerry Qi, Ruike Zhao, and co-workers present a novel magnetic shape memory polymer that uses the embedded particles to regulate material stiffness induce actuation. This enables integrated shape-manipulation functions, including untethered rapid reversible change, sequential actuation, locking, reprogrammability. The functions permit applications such as soft grippers with large grabbing force, morphing electronics, minimally invasive biomedical devices.

This paper describes an intuitive approach for synthesizing metal-only, low-profile, high-gain stepped reflector antennas that can aid emerging technologies in the areas of communications and remote sensing. The required aperture is synthesized using a family confocal parabolic sections, each which scatters phase to provide focused beam far field. sections distinct advantage over conventional Fresnel zone plate (FZP) antenna, since radiation inherently unidirectional. Furthermore, metal-only...

With the advent of small-scale satellite technologies, there has been significant interest in developing advanced functionalities for CubeSat and SmallSat projects. Developing high-gain antennas within this paradigm opens door many new applications which require high data rates or narrow-beam patterns. In paper, we discuss optimization a compact, spline-profile horn antenna assembly that could be used as feed future deployable offset reflector CubeSats.

The typical septum polarizer that has gained popularity in the literature may be unsuitable for high-power applications, due to sharp corners design. In order address this issue, fundamentals of operation are first revisited, using a graphical visualization through full-wave analysis. A profiled with smooth edges is next presented, enhanced power-handling capabilities comparison stepped-septum polarizer. work, sigmoid function introduced represent contour septum, and enable diverse...

Bias lines form an integral part of the reconfigurable antenna design process. Current methodologies for bias are either too narrowband or require a relatively large amount real-estate that may not be available. Also, metallic unsuitable designs with strong fields in line location. using resistive materials often prototyped microfabrication facilities, but these facilities might always accessible. This letter investigates novel, practical, and cost-effective solution conductive adhesives....

Supporting wide-band circular polarization (CP) over broad bandwidths poses a significant challenge for patch antennas and arrays. In any CP antenna, not only must the antenna's impedance-matching requirements be met; circularity of radiated wave considered as well [1]. The can defined by wave's axial ratio (AR), which describes variation instantaneous electric field magnitude versus time. An AR lower than 3 dB is usually sufficient to ensure good circularity, although many high-performance...

This paper presents the design of a frequency reconfigurable wideband E-shaped patch antenna using particle swarm optimization. Ideal switches are used to demonstrate proof concept reconfigurability. Utilizing an appropriate fitness function, optimized which works in range from 2GHz 3.25GHz (53% total bandwidth) is obtained. A prototype developed and measurements performed.

The recent success of the Mars Science Laboratory (MSL) has garnered worldwide interest in further exploration Mars. In this article, we discuss our latest developments circularly polarized (CP) patch subarrays to be integrated into a larger 30-dB gain array. This array will facilitate an enhanced dual-band direct-to-Earth (DTE) link with NASA's Deep Space Network at X band. frequency ratio between both bands is rather small, value 1.17, and current or wide-band CP elements are not easily...

Reconfigurable antennas are quite useful because of their versatility in many different applications. An innovative approach for configuring these using an optimizer is investigated. This accomplished by implementing particle swarm optimization as the antenna controller. Simulation results show rapid convergence onto optimal pixel configurations a desired resonant frequency. In summary, Software Optimized Antenna (SOA), novel class antenna, being proposed and

Composite right/left-handed (CRLH) transmission lines have recently attracted a significant interest due to their abilities generate phase characteristics which go beyond the typical right-handed lines. In this work, we demonstrate use in generating wideband quadrature excitation for creating circular polarization (CP) with antenna systems capable of two orthogonal polarizations. particular, investigate application towards patch array sequentially rotated elements. By engineering dispersion...

Developing compact deployable umbrella reflector antennas for CubeSats potentially enables several advanced applications requiring high antenna gain. The size and weight constraints imposed by the CubeSat standard makes a smaller number of gores attractive applications. This work revisits determination optimum feed location gain loss with an emphasis on gores. We review underlying assumptions previous approaches that analyzed reflectors large Furthermore, this provides comparison results...

Rectennas for ambient RF energy harvesting are gathering significant interest as a source of sustainable energy. Maximizing harvested output is challenging due to the limitations bandwidth antenna and impedance matching non-linear rectifier. In this work, we propose hemispherical array multiband, coupled-resonator monopoles harvesting. We employ multiband monopole target frequency bands with high densities, particularly at GSM900, GSM1800, WLAN (2.4 GHz) frequencies. Using further enables...

The use of multiple optimization algorithms to solve a design problem in electromagnetics can offer more reliable runs and further ensure robustness finding the global optimum design. Utilizing techniques thoroughly search solution space, advantages each algorithm be exploited. PSO CMA-ES are selected demonstrate this due substantial differences their exploration mechanisms multi-dimensional spaces. These applied mathematical benchmark functions as well stacked patch for weather radar systems.