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An IR-UWB indoor positioning is proposed in the paper that combines the algorithm of Time-of-Arrival (TOA) and band-gap modulations. The positioning is referenced by three UWB locators that have different band-gap and deployed in a right triangle. An object can determine its position by identifying pulse backscattered on locators and each locator's signatures through recognizing the exact segment...
An efficient approach to suppress the mutual coupling of a three-element microstrip patch array and a four-element microstrip patch array is proposed using waveguided band-gap structure (WG-BGS). The waveguided band-gap structure are realized by crossed-meander-line slits, which exhibit band-gap property. By inserting the WG-BGS between the elements of coupled patch arrays, the mutual coupling of...
Design and analysis of millimeter-wave (MMW) mushroom-like, circular-patch electromagnetic band-gap (EBG) structure is presented. The in-phase reflection and band-gap characteristics of the proposed EBG structure are investigated. Results show that the proposed EBG structure has stable reflection properties when normally and obliquely illuminated by a plane wave with different polarizations around...
A range sidelobe suppression method is proposed for frequency diverse multiple-input multiple-output (FD-MIMO) sonar imaging. Unlike traditional methods which suppress cross-correlation functions (CCFs) between transmitting waveforms as low as possible, we use band overlapped frequency diverse continuous wave (FDCW) pulses to obtain relatively high CCFs. We point out that these relatively high CCFs...
An omnidirectional photonic band gap (OPBG) in one-dimensional (1D) plasma photonic crystals (plasma-PCs) with fractal quasi-periodic structures, which are consisting of plasma and two isotropic dielectrics is theoretically calculated by the transfer matrix method (TMM). Compared to the Bragg gaps, the OPBG is not dependent on the angle of incidence and both transverse electric (TE) and transverse...
This article presents a computational study on the impact of layer distance on the miniband formulation and density of state under different quantum dot structural parameters-height, interdot space-in a bilayer and well-aligned Ge/Si quantum-dot array. The miniband bandwidth, energy and effective bandgap is tunable by introducing an additional quantum dot layer. When the vertical distance between...
Electromagnetic band gap (EBG) is widely used to suppress the transportation of simultaneous switching noise (SSN) in circuit. But the periodic High impedance planes of EBG destroy the return path of signal line. That phenomenon leads serious problem of signal integrity, which makes the research of EBG more important. In this paper, a new structure of EBG with multi-via and double-layer structure...
A kind of V-shape-meander-line reconfigurable electromagnetic band-gap (EBG) structure is designed in this paper. The proposed EBG structure is fabricated and measured. It is found that miniaturization and frequency reconfigurability of EBG structure can be realized.
In this paper, the properties of omnidirectional photonic band gaps (OBGs) in two-dimensional plasma photonic crystals (2D PPCs) for two novel configurations with triangular lattices are theoretically investigated by the modified plane wave expansion method in detail as the off-plane incident wave vector is considered, which are composed of the nomagnetized plasma cylinders inserted into the homogeneous...
We report the amplification of 250 GHz pulses as short as 150 ps without observation of pulse broadening using a photonic-band-gap (PBG) gyrotron traveling-wave-amplifier. The gyrotron amplifier operates with 38 dB of device gain and 8 GHz of instantaneous bandwidth. The operational bandwidth of the amplifier can be tuned over 16 GHz by adjusting the operating voltage of the electron beam and the...
The maximum usable frequency of a Substrate Integrated Nonradiative Dielectric (SINRD) waveguide is determined by the following factors: parallel plate mode, next higher order mode and the appearance of bandgap effect. Parametric studies are performed to reveal the dependency of the above mentioned factors on the waveguide structural parameters. Guidelines have been formulated for the first time for...
In this manuscript, an artificial immune network was applied to the inverse problem of maximization of complete photonic band gaps in two-dimensional photonic crystals. The computation of dispersion relations in such structures were carried out by means of the MIT Photonic-Bands package. Because of its multimodal searching capability, the artificial immune network could reach similar results, as well...
In this paper, a parametric study was done to find out the superstrat influence on locating the central frequency of the band gap. The present work compares the standard mushroom like with the EBG structures which are located between the substrate and the superstrat. The main motivation is to present a theoretical contribution by comparing the equations describing the central frequency of the band...
Phononic crystals (PCs) commonly consisted of two materials with huge contrasted elastic properties and mass densities. In this paper, the propagation of Lamb waves in the composite PCs is investigated. Coupling effects of band gaps for low order Lamb wave modes are found. Crucial parameters such as the periodical arrangement of the scatterers are discussed in detail for the influence of band structures.
To build a stable power distribution network for high-speed digital systems, simultaneous switching noise (SSN) should be sufficiently suppressed in multi-layer PCBs. In this paper, novel uni-planar compact electromagnetic bandgap (UC-EBG) structures with triangular-type unit cells designed on power/ground planes are proposed for the ultra-broadband suppression of SSN. The effect of the structural...
In this paper, a novel Sierpinski Carpet Fractal based Photonic Band Gap (PBG) structure is proposed. The novel fractal based PBG offers better band gap response as compared to the square lattice shaped PBG. The application of the novel PBG on Hemispherical Dielectric Resonator Antenna (HDRA) significantly improves the peak gain of the antenna from 6 dBi to 10 dBi at 2.05 GHz and the impedance bandwidth...
Linear voltage regulators are widely used in electronic systems for low noise and precise output voltage. This paper presents an output-capacitorless linear voltage regulator with 5.5V∼40V input voltage, 5V output voltage and 100mA load current. The damping-factor-control (DFC) frequency compensation has effectively enhanced the loop stability. A high to low circuit is presented to supply power for...
Combining quantum well intermixing and multiple die bonding a broadband superluminescent III-V on silicon LED was realized. Balancing four LEDs with different band gaps resulted in 292nm 3dB bandwidth and an on-chip power of −8dBm.
A highly efficient terahertz photoconductive antenna (THz-PCA) has been developed as a wideband terahertz detector for terahertz time-domain spectroscopy (THz-TDS) systems with a periodic bias line structure to remove unwanted reflections and enhance the frequency resolution. This novel THz-PCA is characterized in a THz-TDS system using a 100 fs optical pulse excitation from which a terahertz pulse...
Optical bandwidth of photonic multiple quantum well structure is analytically computed subject to the polarized incidence of electromagnetic wave on the structure. Both p-polarization (TE mode) and s-polarization (TM mode) are considered to observe the tuning of bandwidth by suitable variation of structural parameters. Semiconductor heterostructure is considered as material system for simulation purpose,...
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