A new numerical stochastic optimization algorithm, inspired from colonizing weeds, is proposed for Electromagnetic applications. This invasive weed (IWO), described and applied to different electromagnetic problems. The linear array antenna synthesis, the standard problem used by engineers, presented as an example application of IWO. Compared PSO, features IWO are shown. As another application, design aperiodic thinned antennas optimizing number elements at same time their positions...

To prevent interference problems due to existing nearby communication systems within an ultrawideband (UWB) operating frequency, the significance of efficient band-notched design is increased. Here, band-notches are realized by adding independent controllable strips in terms notch frequency and width fork shape UWB antenna. The size flat type antenna etched on 24 times 36 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> substrate. Two...

A Ka-band inset-fed microstrip patches linear antenna array is presented for the fifth generation (5G) applications in different countries. The bandwidth enhanced by stacking parasitic on top of each patch. employs 16 elements an H-plane new configuration. radiating and their feed lines are arranged alternating out-of-phase 180° rotating sequence to decrease mutual coupling improve radiation pattern symmetry. (24.4%) measured (24.35-31.13 GHz) achieved with -15 dB reflection coefficients 20...

A closely located dual-band meander-line antenna array with isolation enhancement by inserting novel split electromagnetic bandgap (EBG) uniplanar structure is proposed. The coupled to a parasitic rectangular patch achieve the operation. Splits are applied on surface of an EBG cause decoupling at first resonant mode and utilizing decouple second mode. prototype proposed achieves dual band 180 MHz (3.42-3.6 GHz) 400 (4.7-5.1 GHz). mutual coupling significantly reduced 26 44 dB 3.48 4.88 GHz,...

The input impedance of stacked cylindrical dielectric resonator antennas is investigated experimentally. resonators are made different materials. bandwidth 25% has been observed for a standing wave ratio better than 2.

Wideband dielectric resonator antennas are designed by shaping the materials. New of conical shape experimentally examined and some results verified numerically. Four different cone shapes considered. The excitation is considered to be a coaxial probe displaced from axis. Two configurations show wideband performance. split achieved about 50% impedance bandwidth. radiation patterns computed within band examine effect modes excited on patterns.

A frequency reconfigurable microstrip patch antenna is presented. It found that the incorporation of a U-slot in can provide flat input resistance and linear reactance across wider bandwidth than conventional antenna. By placing variable capacitor an inductor at input, impedance matching be varied. The fabricated prototype attains tunable range from 2.6 to 3.35 GHz. proposed simple structure, control circuitry placed underneath ground plane. suitable for use reducing crosstalk adjacent...

The U-slot patch antenna, a single-layer single-patch antenna on relatively thick substrate (/spl sim/0.08/spl lambda//sub 0/), is wide-band with an impedance bandwidth in range of 20%-30%, which about order magnitude larger than that the regular antenna. Recently, it was shown half one dimensions patch, maintains similar behavior. half-structure also successfully applied to shorting wall. In this paper, new results structures, not previously published, are presented. First, pin technique...

The performance of single feed truncated corner circularly polarized microstrip antennas with different substrate thickness is studied by simulation and experiment.It found that the axial ratio bandwidth could be enhanced considerably when a thicker used, provided U-slot and/or L-probe used to effect impedance matching.One configurations attains an (< 3 dB) about 14% within matching band 0.2λ o .

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A wide band patch antenna fed by an L-probe can be designed for dual- and multi-band application cutting U-slots on the patch. Simulation measurement results are presented to illustrate this design. </para>

We discuss how forward scattering can he characterized in terms of an equivalent blockage width, and a relation between this the bistatic width is derived. Then, we show cylinders such as struts masts be constructed to reduce their widths. Thereby, when are mounted front antenna, sidelobes losses caused by will reduced. For thin metal reduction obtained giving its cross section oblong shape and, addition (for TM case), coating outer surface with dielectric material obtain hard boundary...

A new particle swarm optimization (PSO) technique for electromagnetic applications is proposed. The method based on quantum mechanics rather than the Newtonian rules assumed in all previous versions of PSO, which we refer to as classical PSO. general procedure suggested derive many different PSO algorithm (QPSO). QPSO applied first linear array antenna synthesis, one standard problems used by engineers. performance compared against an improved version outperforms most time convergence speed...

A center-fed circular microstrip patch antenna with a coupled annular ring is presented. This has low profile configuration monopole like radiation pattern. Compared to the (CPA), proposed large bandwidth and similar The fabricated tested. It resonates at 5.8 GHz, corresponding impedance gain are 12.8% 5.7 dBi, respectively. Very good agreement between measurement simulation for return loss patterns achieved.

The objective of the present study is to improve bandwidth dielectric resonator antenna (DRA) excited by a coaxial probe using stacked DRA configuration above an infinite ground plane. axisymmetric and placed off axis excite HEM/sub 11/spl delta// mode in DRA, resulting broadside radiation pattern. A surface integral equation formulation method moments are used for numerical analysis. input impedance far field patterns have been computed effects different parameters on performance...

A circularly polarized rectangular stair shaped dielectric resonator antenna (DRA) is presented. The DRA excited by a narrow slot and rotated 45/spl deg/ with respect to the sides of generate circular polarization. parametric study length width ratio optimize axial bandwidth given. 3 dB 10.6% achieved when 1.9.

A wideband circularly polarized (CP) L-slot antenna single fed by L-shaped feed line is designed. Wideband CP obtained truncating one of the corners element. This arrangement introduces orthogonal components with quadrature phase difference to excite wave. bandwidth 46.5% (2.18-3.5 GHz) achieved an dB and dB. Good agreement between measured computed results achieved. Moreover, parametric study are presented.

The U-slot patch antenna was originally developed as a single-layer, single-patch wideband antenna. It has recently been shown that it can also be designed to perform number of other functions. In this paper, comprehensive account is given on the development Emphasis placed experimental and simulation results for various topologies, illustrating antenna's versatility in several practical applications. These include wideband, dual- triple-band operation with small large frequency ratios, well...

An effective technique for reducing the mutual coupling between two dielectric resonator antennas (DRAs) operating at 60-GHz bands is presented. This achieved by incorporating a metasurface DRAs, which are arranged in H-plane. The comprises an array of unique split-ring (SRR) cells that integrated along E-plane. SRR configuration designed to provide bandstop functionality within antenna bandwidth. By loading DRA with 1 × 7 unit cells, 28-dB reduction level without compromising performance....

A numerical method for determining the electromagnetic field in presence of one or several bodies revolution is presented. The objects can be made conductors, dielectrics their combinations. excitation assumed to due a plane wave infinitesimal electric dipoles located within outside dielectric. Several formulation types are considered and used investigate scattering by different objects. It found that moderate values dielectric constant, all give satisfactory results. However, small large...

This paper presents a new type of narrow band filter with good electrical performance and manufacturing flexibility, based on the newly introduced groove gap waveguide technology. The designed third fifth-order filters work at Ku 1% fractional bandwidth. These structures are manufactured an allowable between two metal blocks, in such way that there is no requirement for contact alignment blocks. major advantage compared to normal rectangular filters. measured results show reasonably...

The ever-increasing demand for high-datarate wireless systems has led to a crowded electromagnetic (EM) spectrum. This successively spurred the development of versatile microwave and millimeter-wave integrated components possessing high selectivity, multifunctionalities, enhanced efficiency. These require class nonreciprocal structures endowed with extra functionalities, e.g., frequency generation, wave amplification, full-duplex communication. Space-time (ST) modulation been shown be...

This paper presents a gap waveguide-based compact monopulse array antenna, which is formed with four unconnected layers, for millimeter-wave tracking applications at W-band (85-105 GHz). Recently developed waveguide technology removes the need galvanic contact among metallic layers of structures, and thereby, makes proposed antenna suitable easy low-cost manufacturing. In this context, low-loss planar Magic-Tee designed to be used in comparator network consisting two vertically stacked...

High-efficiency millimeter wave antenna array is proposed. A cooperate feeding network designed using the new printed ridge gap waveguide technology, which self-packaged with low loss. The to couple narrow slots arranged in a planar that coupled broadband magnetoelectric (ME) dipoles. An of 4 × ME dipoles designed. simulated results are verified measurements. measured reflection coefficient less than -10 dB over 16.5% bandwidth (28.8-34 GHz). gain higher 19 dBi, and cross polarization around...

In this paper, a wideband magnetoelectric (ME) dipole antenna excited by slot coupled to fork-shaped printed ridge gap waveguide is proposed. To enhance the gain, meta lens consists of three layers split ring resonators (SRRs) are integrated horizontally in front ME antenna. Each slab contains 3×7 array SRR unit cells. The matching bandwidth improved as secondary effect lens. A 1 × 4 designed provide more gain adjusting between edge elements four-element array. fabricated and tested....

A compact structure with slot splitting meandered lines defected ground is proposed to reduce the mutual coupling between two microstrip antennas a center-to-center distance of 0.38λ. The line symmetrically etched on antennas. optimized and explained by common/differential mode theory. For experimental verification, fabricated measured. Simulation measurement results excellent agreement show that can be reduced significantly using structure. In addition, significant improvement achieved in...