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In this letter, a new evolutionary algorithm-based method for the optimization of intrinsic elements small-signal model (SSM) GaN HEMT devices is presented. The uses unique search space exploration strategy algorithms to obtain an optimized compact SSM from extracted parameter and measured S-parameters. validity verified by comparing S-parameter dataof 2 × 0.1 50 μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> GaN/Si 4 75 GaN/SiC in...

Multi-pulsing dissipative soliton resonance (DSR) in all-normal dispersion (ANDi) domain has been studied numerically and observed experimentally a nonlinear amplifying loop mirror (NALM) based Yb-doped mode-locked fiber laser. Numerical simulation over large number of roundtrips shows evolution multi-pulse Gaussian input field into multiple DSR pulses with equal flat-top amplitude intra-pulse temporal separation. The dependence stable multi-pulsing on the pump power also studied. laser...

In this Letter, experimental observation of dissipative rogue waves (DRWs) due to spectral filtering induced pulse instabilities in a mode-locked ytterbium (Yb) fiber laser has been presented. A semiconductor saturable absorber mirror was used mode-lock the linear cavity and chirped Bragg grating (CFBG) for dispersion management, which also acted as filter output coupler. Under stable conditions, delivered managed solitons 447 fs duration 0.69 nJ energy at 10.19 MHz repetition rate with...

In this paper, we propose an all-normal-dispersion ytterbium-fiber laser with a novel ring cavity architecture having two nonlinear amplifying loop mirrors (NALM) as saturable absorbers, capable of delivering distinctly different pulses adjustable features. By optimizing the lengths individual NALMs, can be operated to deliver Q-switched mode-locked (Q-ML) pulse bunches repetition rates, in dissipative soliton resonance (DSR) regime or noise-like (NLP) tunable width. The DSR exhibit...

AbstractIn this article, non-uniformly excited linear arrays are optimised using Taylor distribution and classical particle swarm optimisation (CPSO) algorithm for obtaining desired equal side lobe level (SLL). Elements of the array considered to be isotropic in nature with uniform interelement spacing. Excitation amplitudes each element taken as parameters. defines range excitation amplitude which CPSO searches optimum value amplitude, objective SLL. The proposed method eliminates initial...

A novel fractal patterned iris loaded cross dipole slot antenna along the broad wall of a rectangular waveguide at X-band is proposed with wideband operation. Tapering junction slots results in wide impedance matching. Bandwidth enhancement better than 2 GHz achieved optimisation depth and inclusion second iteration vicinity primary slot. Peak realised gain remains around 7 dBi over operational bandwidth.

A dissipative soliton resonance (DSR) mode-locked Er:Yb fiber laser has been used to pump a thulium generate gain-switched pulses at high repetition rates. Here 412 ns long DSR with center wavelength of around 1.56 μm rate 410 kHz have fed laser, resulting in generation 1.94 μm. The minimum pulse width achieved was 256 an average power 4.6 W 66% slope efficiency. Gain-switched 520 and 750 were generated through changing the by modifying cavity. To best our knowledge, this is first...

This letter investigates two different methods of null placement in uniformly excited beam-steered planar array. Both utilize control excitation amplitude and phase edge elements placed along the symmetrical axes The first method considers additional presence existing complex excitation, whereas second employes an by redefining elements. Effectiveness has been illustrated through design examples 22 × 41 47 arrays.

Structurally novel 'Hexagram' shaped microstrip loop antenna variants are reported here which provide multiple bands in the useful frequencies ranging from S to K-band. This design yielded at least six resonances with 51% bandwidth C, X & Ku and 18.4% K band. Reactive loading of patches provided better impedance matching respect <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$50\Omega$</tex> coaxial input, over The proposed exhibits compactness...

Abstract The frequency response of the return loss and radiation pattern performance waveguide-fed planar slot arrays is investigated as a function total admittance radiating slots in each waveguide impedance coupling feed waveguide. End-fed center-fed with different aperture distributions amounts overloading were designed using Elliott's equations. These analyzed by method moments solution for coupled integral equations electric field. Results on bandwidth are discussed.

At microwave and millimeter wave frequency, SIW technology is an emerging aspirant for the progress of antennas, circuits components yielding a link between planar non technology. Present study intends to provide impression exploitation Substrate Integrated Waveguide (SIW) based antenna design subject different structures, feeding mechanisms as well performances. The performance enhancement technique has been compared characterized by bandwidth enhancement, size miniaturization, reduction...

This paper proposes the design of an energy efficient, high speed and low power full subtractor using Gate Diffusion Input (GDI) technique. The entire has been performed in 150nm technology on comparison with a employing conventional CMOS transistors, transmission gates Complementary Pass-Transistor Logic (CPL), respectively it found that there is considerable amount reduction Average Power consumption (P <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A wide band iris excited fractal slotted array has been realized and experimentally verified at X band. The design starts with a centered plus shaped slot in the broadwall of rectangular waveguide same used second iteration for configuration, which exhibits dual resonance. unit cell is optimized bandwidth by carrying out parametric study slot-iris combinations 2.4 GHz achieved both radiation pattern impedance response. An empirical expression conductance developed to facilitate antenna using...

Design of a compact band pass filter using parallel-coupled half-wavelength microstrip resonators with improved stopband skirt characteristics and harmonic suppression is presented in this paper. The proposed has fractional bandwidth 20% subject to design frequency 5.25 GHz for WLAN applications. Periodic triangular corrugations have been employed each coupled section parallel lines 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup>...

The article presents the design of a compact narrowband microstrip cross-coupled bandpass filter with improved selectivity and wide stopband. proposed fourth-order quasi-elliptic is designed at 2.5 GHz fractional bandwidth 4% suitable for WLAN applications. At first, doubly-folded half-wavelength hairpin lines have been arranged symmetrically in configuration combining electric, magnetic, mixed coupling. Accordingly, size reduction 17% over folded inline hairpin-line same specifications has...

A high-speed switched capacitor based distributed MEMS phase shifter has been presented. Miniaturization of the conventional dimensions done to achieve sub-microsecond switching, lower actuation voltage and a compact structure. Conventional design approach such employs cascading capacitors on linear coplanar transmission line. Compactness device is achieved by employing space filling curves like i) Meander line CPW ii) Modified Hilbert curve CPW. Simulations conducted reveal that modified...

In this work, an experimental study of non-stationary pulse dynamics consisting explosion events and chaotic multi-pulsing from all-normal dispersion Yb-fiber laser operating in noise-like (NLP) state have been reported. During NLP state, which resembled soliton explosion, dispersive Fourier transform measurements revealed large, intermittent amplitude fluctuations the real-time spectrum indicative rogue waves. The either appeared randomly at lasing wavelength within Yb-gain spectra or...

In this paper the implementation of a low power high speed 3-bit Flash Type ADC is reported using 180 nm CMOS technology. The concept Threshold Modified Comparator Circuit (TMCC) introduced as modification conventional comparator. structure occupies an active area 0.012 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and consumes 179 μWatt Average Power while operating with input frequency (f <sub...