نتایج جستجو برای: bandwidth enhancement

تعداد نتایج: 180000  

Journal: :Applied Computational Electromagnetics Society Journal 2023

In this paper, a coplanar waveguide (CPW) fed slot antenna using fractal-shaped isosceles trapezoidal corrugations is designed and presented for Ultra-Wideband (UWB) applications. The proposed formed by regular hexagonal patch through CPW feed line radiates amidst notched wide slot. edge of the shaped fractal structure that five notches. printed on RO4350B substrate having compact size 0.305λ0 ...

Journal: :IEICE Transactions 2012
Takeshi Kuboki Yusuke Ohtomo Akira Tsuchiya Keiji Kishine Hidetoshi Onodera

This paper presents an area-effective bandwidth enhancement technique using interwoven inductors. Inductive peaking is a common practice for bandwidth enhancement, however the area overhead of inductors is a serious issue. We implement six or four inductors into an interwoven inductor. Furthermore parasitics of the inductors can be reduced. The proposed inductor is applied to a laser-diode driv...

Journal: :Optics express 2010
SeungHun Lee Devang Parekh Takahiko Shindo Weijian Yang Peng Guo Daisuke Takahashi Nobuhiko Nishiyama Connie J Chang-Hasnain Shigehisa Arai

The modulation bandwidth enhancement of distributed reflector (DR) lasers with wirelike active regions utilizing optical injection locking is demonstrated both theoretically and experimentally. By the rate equation analysis, it is shown that DR lasers with wirelike active regions realize a low optical injection power and a large bandwidth enhancement under small operation currents. Experimental...

2016
Shing Chyi Chua Eng Kiong Wong Alan Wee Chiat Tan

This paper aims to present fingerprint image enhancement by using directional circular raised cosine filters which are implemented using a radial component and an angular component. It has been compared with the common filters used for bandpass filtering, i.e. circular Gabor filters and Log-Gabor filters at the same bandwidth. The experimental results have found that the circular raised cosine ...

2010
Jochen Withopf Patrick Hannon Mohamed Krini Gerhard Schmidt

The majority of current speech enhancement systems are based on generalized signal-to-noise ratio dependent weighting rules and do not take into account the characteristics of the actual speech sound being processed. The following contribution is concerned with phoneme-specific speech enhancement methods that apply specially tailored signal processing methods. The first signal processing algori...

Journal: :Journal of neurophysiology 2003
Dario L Ringach Michael J Hawken Robert Shapley

The temporal development of neural selectivity to physical attributes of a visual stimulus, such as its orientation and spatial frequency, can provide important clues about mechanisms of cortical tuning. We measured the dynamics of orientation tuning in macaque primary visual cortex (V1) and found several dynamical features in the data: changes in global enhancement and suppression, narrowing o...

2007
Masahiro Oshikiri Hiroyuki Ehara Toshiyuki Morii Tomofumi Yamanashi Kaoru Satoh Koji Yoshida

In this paper, we present a 6.8-32 kbit/s scalable speech and audio coder using a modified-discrete-cosine-transform (MDCT)-based bandwidth extension on top of a 6.8 kbit/s code-excited-linear-prediction (CELP) coder. The proposed coder comprises a 6.8 kbit/s narrowband CELP as its corelayer and eight enhancement layers with the bitrates of 0.8, 1.2, 3.2, or 4.0 kbit/s. After encoding of a narr...

Journal: :Optics letters 2002
Daniel L Marks Amy L Oldenburg J Joshua Reynolds Stephen A Boppart

The axial resolution of optical coherence tomography images is primarily dependent on the bandwidth of the illumination source. Continuum generation is one way to generate the single-mode, high-bandwidth light needed for point illumination. We present an inexpensive and easy-to-implement augmentation to a Ti:sapphire laser that widens the bandwidth from 20 to over 200 nm with commerically avail...

2014
Yingying Tan Liping Yan Xiang Zhao Changjun Liu Kama Huang

A printed slot antenna fed by a microstrip line with a diamond-shaped tuning stub for bandwidth enhancement is proposed and experimentally validated. Impedance bandwidth, radiation pattern, and gain characteristics of the proposed antenna are investigated. The simulated results show that the impedance matching of the proposed rotated slot antenna is greatly affected by the dimension of the slot...

Journal: :Optics letters 2009
An-Bang Wang Yun-Cai Wang Juan-Fen Wang

We experimentally and numerically demonstrate a route to bandwidth-enhanced chaos that is induced by an additional optical injection for a chaotic laser diode with optical feedback. The measured and calculated optical spectra consistently reveal that the mechanism of bandwidth enhancement is the interaction between the injection and chaotic laser field via beating. The bandwidth can be maximize...

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