A compact printed ultra-wideband (UWB) monopole antenna with dual band-notched characteristics is presented. One complementary split-ring resonator (CSRR) etched inside the patch of to achieve notch frequency bands. practical example for a UWB (working from 2.90 12 GHz) demonstrated, one band at 3.40–3.48 GHz and other 5.40–5.98 GHz. In addition, effect dimensions CSRR on bands also analysed.

Polarizabilities play significant roles in describing dispersive and inductive interactions of the atom molecular systems. However, an accurate prediction polarizabilities from first principles is computationally prohibitive. Although physical models or statistical machine learning have been proposed, either a lack description local chemical environments demanding large number samples for training has limited their practical applications. In this study, we combine physically inspired dipole...

Electron density is a fundamental quantity that can in principle determine all ground state electronic properties of given system. Although machine learning (ML) models for electron based on either an atom-centered basis or real-space grid have been proposed, the demand number high-order functions points enormous. In this work, we propose efficient grid-point sampling strategy combines targeted favoring large and screening associated with linearly independent atomic features. This new...

A wideband frequency diversity printed-Yagi antenna array is presented. The operating band of the single port L-/S-bands element can be selected by changing states p-i-n diode switches. Land S-bands work independently. 4 × S-band constituted to a 2 L-band modifying apertures. This operates at 1-2 GHz/2-4 GHz in with fractional bandwidth 66.7%/66.7%, which translated into an overall tuning ratio 4:1. spacing adjacent elements each reconfigurable mode less than 0.72λ <sub...

Electron density is a fundamental quantity, which can in principle determine all ground state electronic properties of given system. Although machine learning (ML) models for electron based on either an atom-centered basis or real-space grid have been proposed, the demand number high-order functions points enormous. In this work, we propose efficient grid-point sampling strategy that combines targeted favoring large and screening associated with linearly independent atomic features. This new...

A pattern reconfigurable antenna array with two elements is designed in this paper. The element made up of a printed Yagi and feed structure variable phase. By changing the states diodes these elements, far-field radiation phase both can be changed. That is, function realized. In way, impedance bandwidth 75.9% (2.7~6.0 GHz), which peak gain direction switched between -θ, 0 +θ (θ = 10°~16° at different frequencies). With simple structure, adjusted according to demands. It applied broadband...

A broadband directional circularly polarized (CP) antenna is investigated by placing two pairs of parallel dipoles orthogonally in a square plane. The proposed printed on planar structure, which integrates sequential-phase (SP) network single substrate. Parasitic stepped-patches are introduced beside the arms each dipole to improve axial ratio (AR) bandwidth. Measurements show that has |S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub>...

A wideband sleeve monopole antenna is presented. In this design, a cylindrical introduced to enhance the impedance bandwidth. For reducing weight of antenna, hollow metal tube employed as main radiator. Moreover, another four rectangular stubs are for matching. It shown that proposed achieves an bandwidth 141.2% (1.16-6.74GHz) voltage standing wave ratio (VSWR) ≤ 2, and has symmetrical radiation patterns over operating frequency band. Therefore, it suitable applications wide wireless communication.

A new reconfigurable center-feeding microstrip antenna is presented. By controlling the different states of PIN diodes, can operate in either normal patch or monopolar mode for number grounded shorted probes frequency bands. That to say, with eight connected ground, a right-hand circular polarization (RHCP) broadside radiation pattern excited at 2.5GHz. Otherwise, linear (LP) conical achieved 3.5GHz by four probes. The gains two modes are 9.0 dBic and 5.0 dBi, respectively. Compared former...