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...

Recently, a considerable research interest has grown up in the millimetre wave wireless system as most promising technologies next generation communication. Since high-frequency channels of are easily attenuated space, beamforming technology relying on massive multi-input-multi-output is introduced to transmit very narrow directional beam, so greatly improve efficiency. Then challenging problem lies that how optimise overall throughput by allocating antenna resources different mobile users...

This paper presents a low-profile dual-polarized stacked patch antenna for micro-base-station applications. The proposed includes three elements, where each element consists of two rectangular patches, substrate and reflector. By introducing dual-feed technique, dual-polarization characteristic is achieved. bandwidth improved by couple patch. Measured results show that the can operate in 1710 to 1980 MHz (impedance 14.6%) with S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A dual-band circularly polarized (CP) antenna with wide half power beamwidths (HPBWs) for compass navigation satellite system (CNSS) applications is proposed in this paper. The CP radiation realized by feeding four sequentially rotated U-shape patches shorted to the ground at both ends of them a 90° phase difference network. Loading parasitic arc-shape one end provides operation. Experimental results show that exhibits two overlapped impedance and axial ratio relative bandwidth 2.8% 3.3%....

The Vlasov-Poisson model is one of the most effective methods to study space charge dominated beam evolution self-consistently in a periodic focusing channel. Since approach get solution with this not trivial, previous studies are limited degenerated conditions, either smoothed channel (constant focusing) [I. Hofmann, Phys. Rev. E 57, 4713 (1998)] or alternating gradient equal initial emittance condition degrees freedom Hofmann et al., Part. Accel. 13, 145 (1983); Chao Li THOBA02, IPAC2016]....

The following topics are dealt with: learning (artificial intelligence); antenna radiation patterns; electromagnetic wave polarisation; 5G mobile communication; Internet of Things; feeds; optimisation; MIMO telecommunication power management; cloud computing.

In this paper, a 32-element wideband low-profile printed-dipole array antenna is presented. Elliptical dipole used as the element, which exhibits good characteristic. Further bandwidth enhancement can be realized by loading circular parasitic patch above dipole. The parallel double transmission line, printed on both sides of substrate utilized feeding network, and metal reflector employed for gain unidirectional radiation. measurement results show that has an impedance 100% from 3GHz to 9GHz...

The optical approach to estimate the direction-of-arrival (DOA) estimation of microwave signals has attracted a lot attention recently. Most existing methods are based on one-sensor array system, which converts DOA problem into an power problem. Their main disadvantage is that additional work needed represent relationship between phase shifts and powers before estimation. algorithm proposed in this paper <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow...

The multi-objective genetic algorithm (MOGA) has been applied to optimize the radiation characteristics of a tri-layer rfid microstrip patch antenna in terms return-loss, input-impedance, bandwidth and gain. In addition, MOGA also size each layer substrate. order reduce antenna, Ferrite substrate used objective is achieve high permeability permittivity for miniaturization impedance matching free-space. Ultimately, an optimized -38.63 dB 3.46 dBi gain, 40*30*3.5(mm).

Microstrip antenna array often use one point two power splitters cascading as feed network, at lower frequency such C or S wave band, the insertion loss of network is weak, which made performance stable and efficient. At higher Ka however, cannot be ignored, because electrical properties gain will deterioration obviously. Meanwhile, element space small so routing lines became hard. For large complex wiring shortcomings, this paper proposed a novel for microstrip array, avoids traditional...

In this article, a wideband planar magneto-electric (ME) tapered slot antenna (TSA) with wide beamwidth both in the E-plane and H-plane is investigated. By simply etching slots on basic TSA, which can function as combination of magnetic dipole electric dipole, stable unidirectional patterns are obtained. The metal ground plane further modified to realize across frequency bandwidth. Moreover, double-layer structure employed suppress cross polarization. measured results show that proposed...

A compact dual-band MIMO coupling element based antenna with high port isolation is proposed for the flrst time. The comprises four nonresonant elements, matching circuit, chassis of mobile terminal, and de-coupling structures. can cover two working bands E- GSM900 PCS1900. measured results show that between elements operating at same frequency higher than 20dB. structure be applied to system.

A compact dual-band circularly polarized antenna with wide half-power beamwidths (HPBWs) for compass navigation satellite system applications is proposed in this paper. The CP radiation realized by arranging four inverted-F monopoles symmetrically to the center point, where are excited a 90° phase offset through sequential-phase feeding network. compactness of monopole inserting two chip inductors horizontal portion monopole. overall dimension only 0.211 λ 0 × 0.057 , corresponding...

Abstract Based on terahertz (THz) waves, the realization of mobile high-speed communication and rapid high-resolution imaging through two-dimensional (2D) electronically controlled beam scanning antennas holds significant research merit. However, accomplishing 2D within THz band poses formidable challenges.&amp;#xD;This paper presents a novel design methodology for beam-scanning antenna specifically tailored frequency range. Operating effectively 190GHz-210GHz, proposed demonstrates...

In this Letter, a frequency‐controlled wide‐angle beam scanning antenna operating at 0.3 THz was proposed based on metasurface. The formed by H‐shape cells is periodical, and its’ property analysed the Floquet theorem. To widen angular scope, higher order mode's diffraction wave proposed. A systematic method developed for design of practical in band, which optimisation range, linearity avoidance blocking are comprehensively considered. Additionally, coherent enhancement mechanism improving...

In this article, a wideband aperture coupled magneto-electric (ME) dipole is proposed. The proposed antenna based on the traditional ME which consists pair of horizontal patches and vertical shorted patches. To achieve wide impedance bandwidth, stepped microstrip to slot transition introduced in antenna. Then, part tilted two metal triangular prisms are employed enhance stability gain. A prototype fabricated tested. Good agreements found between simulated measured results. bandwidth for VSWR...

In this paper a novel design of microstrip patch antenna (MPA), which consists two radiation patches and transmission line, is presented to enlarge the frequency ratio (FR). The H-shaped fully analyzed under resonant modes via line model. It indicates that FR among TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> xmlns:xlink="http://www.w3.org/1999/xlink">30</sub> can be entirely dominated by electrical length impedance ratios between...

A novel technique for realizing specified patterns radiated by antenna systems located on a given platform, such as mobile phone or shipboard topside environment is presented in this work. The proposed based the use of Characteristic Basis Functions (CBFs) that are extracted from solutions current distributions generated placing user-specified elements, e.g., monopole PIFA at "allowable" locations platform. Some examples illustrating application CBF approach to pattern synthesis systematic...