A planar ultrawideband (UWB) monopole antenna is proposed in this paper. It has a multiple-trapezoidal with adjustable dimensions. The incorporated the rectangular/rounded-corner ground plane to further improve performances such as impedance bandwidth. geometric complexity of configuration not easily devisable when UWB performance criteria low voltage standing wave ratio (VSWR), minimal size, omni-directional and uniform radiation pattern, relatively constant gain over ultrawide frequency...

A reconfigurable crossed-Yagi patch antenna (CYPA) that yields a circularly polarized pattern is proposed, and optimized by novel Jumping-Genes Genetic Algorithm. This formed two identical orthogonal linear Yagi arrays, around single driven element. The main lobe of the covers elevation angles from 0° to 47° with peak gain 8.68 dBi. Full azimuthal coverage can be achieved switching among four modes. design justification has been duly demonstrated based on fabricated prototypes. effect MEMS...

This paper provides an overview of optimization algorithms for antennas and radio frequency (RF)/microwave circuit designs. The significance wireless communication to our daily lives industrial engineering will first be discussed. Antennas circuits used in then introduced followed by a discussion on the need optimization. After that, this focus three widely RF/microwave design. A survey microwave devices available literature presented include use other algorithms. For illustration purposes...

The current paper proposes a broadband 90 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> differential phase shifter using pair of multisection radial transmission-line (TL) stubs. scattering parameters the are calculated based on TL theory to evaluate shifter's performance. Global optimization is performed model followed by local more accurate electromagnetic simulation. measured operating bandwidth circuit 101.5%, which larger than...

This letter proposes a design of single-layer microstrip ultrawideband (UWB) 90 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> differential phase shifter. The operating bandwidth covers the UWB frequency range from 3.1-10.6 GHz. is optimized using transmission line model and an electromagnetic model, have been fabricated plotter dealing with generation printed circuits. measured <i xmlns:xlink="http://www.w3.org/1999/xlink">S</i> <sub...

Efficient wireless power transmission to a designated location can reduce the size of implantable device and save source energy, but receiver coil rectifier circuit still occupy large area. This paper proposes novel magnetic resonant coupling (MRC)-based double figure-of-eight sensor system induce monitor heat. Implantable devices could obtain energy from surrounding electric field or heating effect. The fundamental generating effect by proposed coil-based is derived, conceptual architecture...

A circular polarized (CP) slot antenna is designed with a composed of multiple sectors (MCS). The design has advantages having wide 3 dB axial ratio (AR) bandwidth 57.4%, achieving good AR smaller than 2 in most areas the frequency range. follows multi-objective optimization procedure that applies computational power rather human tuning. comparison optimized other wideband CP antennas literature shows it physical size cross-sectional area feeding structures and wider operating all compared antennas.

A novel design of trapeizform U-slot folded patch feed antenna is presented in this paper. It optimized by an evolutionary based optimization scheme which capable producing that has a wide impedance bandwidth but small dimension size. The was also experimentally verified its hardware prototype 101.3% measured obtained compared with simulated 104%. Also, both the effectiveness methodology and proposed configuration have been justified through comparison results.

With the ever-increasing adoption of machine learning for data analytics, maintaining a pipeline is becoming more complex as both datasets and trained models evolve with time. In collaborative environment, changes updates due to evolution often cause cumbersome coordination maintenance work, raising costs making it hard use. Existing solutions, unfortunately, do not address version problem, especially in environment where non-linear control semantics are necessary isolate operations made by...

This paper presents, for the first time, design of a rectangular patch hybrid coupler that can operate at two arbitrary frequency bands with same quadrature phase relation between outputs. The procedure is presented. For demonstration, dual-band designed to in 2.4- and 5-GHz corresponding IEEE 802.11 a/b/g bands. measured result shows 9.3% 18.2% bandwidth lower upper

A broadband dumb-bell-shaped 45° phase shifter is presented using a new design comprised of open-circuit and short-circuit multi-section stubs. wideband operating over the frequency range 2–6 GHz was designed fabricated for verification purposes. It measured to have bandwidth about 100% maximum deviation ±3.2°, insertion loss 2.1 dB.

This paper presents, for the first time, design of a size-reduced rectangular patch hybrid coupler. Different types compact couplers with different ground plane patterns are described. For demonstration, two designed to operate at 3.5 GHz. They measured have 30.1% and 33.3% bandwidth 67.3% 72.3% size reduction compared optimized one without patterned plane.

This paper presents the design procedure for complex RF circuits using Jumping Genes Evolutionary Algorithm (JGEA). Due to and stringent requirements industrial environments, it is not an easy task obtain a good in which irregular structures are always needed. In this paper, JGEA has, however, demonstrated its excellent ability practical circuit compared with other algorithms. For demonstration, was used of slot-coupled 3-dB hybrid coupler operating popular Industrial, Scientific Medical...

A wireless communication system consists of various passive components, including antennas, directional couplers, phase shifters, and filters. These components have many dimensional parameters that must be determined. For instance, a coupled line section has width, gap between the lines, length as to Identifying these through trial error is ineffective. Meanwhile, mathematical approach may very complex use some assumptions in calculation introduces differences calculated dimensions actual dimensions.

Two phase shifters are proposed using a multiple circular sector structure. Advantages of the design include low insertion losses and small variations over wide range operating bandwidths. The process follows multiobjective optimization procedure that applies computational power for circuit tuning. Performance analyzed, after fabricating measuring verification. shifter performances compared with other existing configurations in terms variations.

A compact diplexer fabricated on substrate-integrated waveguide (SIW) technology is presented. The a coupled-resonator network with no additional elements such as power dividers, composed exclusively of six SIW resonators coupled through inductive irises, one transmission zero at each channel that improves the selectivity. close physical proximity and leakage associated to via-hole walls characteristic are main challenge this design. However, effect can be taken into account, proved by...

This communication presents an alternate methodology- parasitically coupled feed-for exciting a four element microstrip array radiating primarily in the broadside direction. Typically, is fed directly through corporate feed network using T-junctions and quarter wave transformers. The proposed feeding of simplifies geometry results smaller size for array. In this study, matching radiation characteristics two different mechanisms are simulated electromagnetic analysis code then implemented...

GPU (graphics processing unit) has been used for many data-intensive applications. Among them, deep learning systems are one of the most important consumer nowadays. As applications impose deeper and larger models in order to achieve higher accuracy, memory management becomes an research topic systems, given that limited size. Many approaches have proposed towards this issue, e.g., model compression swapping. However, they either degrade accuracy or require a lot manual intervention. In...

This letter presents two configurations of thin and compact dual-band four-element broadside patch antenna arrays. They are built by feeding four radiating elements through a parasitic coupling. Similar to the electrically steerable passive array radiator (ESPAR), driven element is directly excited from power source, then number mutual The proposed arrays have advantages simple single-layer structure, ease fabrication, low profile, light weight, high gain. performances analyzed in terms...

A compact diplexer fabricated on substrate-integrated waveguide (SIW) technology is presented. The a sixth order coupled-resonator network with no additional elements such as power dividers, composed exclusively of three dual-mode square SIW cavities. coupling between the two orthogonal resonant modes each cavity generated by means vias perturbing symmetry, while inductive irises implement inter-cavity couplings. topology whole restricted orientation modes. prototype passbands around 10 GHz...

A compact slot-coupled broad band 3 dB hybrid coupler has been designed and implemented. Compensation sections are added to achieve a flat coupling without significantly enlarging the size of coupler. Optimization base on Jumping Genes Evolutionary Algorithm is performed obtain tight within 1 imbalance over 1.8 - 5.7 GHz.

This paper presents the design and construction of a pair figure-of-eight coils, coupled by magnetic resonance coupling (MRC), which could generate (150 V/m per Ampere) electric field at focal points for electromagnetic therapy related applications. The E generated targeted site would be significantly enhanced under same amount current flowing through MRC coils compared to normal due superposition contributed coils. Furthermore, coil is designed results are verified in theory, simulation,...

An analysis of wireless information compared to power transfer over the same channel, consisting a transmitting and receiving antenna system, is discussed. This frequency-selective additive-white-Gaussian-noise channel displays fundamental tradeoff between rate at which energy reliable can be transmitted as in an RFID power-line communication or for energy-harvesting system. The optimal tradeoffs transferred capacity due Shannon (which limited), Gabor interference Tuller defined terms signal...

This letter proposes a design of multisection phase correcting network to reduce the error broadband differential shifters. The is constructed by pair parallel coupled lines. With use network, experimental result deviation reduced from 6.4 ° 2.29 for shifter operating 2.3 5.5 GHz (82%). resultant configuration useful construction quadrature power splitter which has also been designed and fabricated in this letter.