escos in peak demand period based on supply chain network

... fading properties of indoor radio wave communication channels The analytic summaries lead to insights on UWB fading channel characterization and modeling The propagation of the UWB signals in indoor ... going into the details The chapter starts with presenting a brief history of UWB radiating elements, and continues explaining the theory behind the frequency independent antennas and the feeding ... technology is considered attractive for a myriad of applications, including high-speed internet access, sensor networks, high accuracy localization, precision navigation, covert communication links, ground-penetrating...

Ngày tải lên: 29/06/2014, 13:20

... Mobile communication,890–960MHz), DCS (Digital Communication System, 1710 – 1880 MHz), PCS (Personal Communication System, 1850 – 1990 MHz) UMTS (Universal Mobile Telecommunication System, 1920 ... Boadband Planar Monopole Antennas nói riêng, đồng thời thiết kế mô anten đơn giản Trong trình hoàn thành đồ án tránh khỏi sai sót, mong thầy cô góp ý giúp đỡ em hoàn thành đồ án tốt Em xin cảm ơn thầy ... Planar Monopole Antennas tương đương với Monopole Antennas hình trụ với đường kính lớn có hiệu Trang 18  Planar Monopole Antennas xem MSA chất dày với Єr= 1, BW lớn Hình dạng kích thước Planar Monopole...

Ngày tải lên: 21/08/2015, 16:38

... systems focusing on the downlink only, the design of bidirectional mmwave RoF systems are also considered Rain-induced attenuation creates one of the most damaging effects of the atmosphere on the ... personal use of the work © 2010 In- teh www.intechweb.org Additional copies can be obtained from: publication@intechweb.org First published March 2010 Printed in India Technical Editor: Sonja ... suggests that matching to a conventional 50 Ohm connector can be obtained by suitably tapering the strip widths Further refinements of the antenna resonance may be obtained by acting on the bow-tie...

Ngày tải lên: 21/06/2014, 11:20

... levels within specified limits Matching of Microstrip Lines Matching of microstrip transmission lines is done by matching each line to the source, its interconnecting transmission lines, and to ... insert a slot on the feeding line UWB antenna in Figure 22 obtained the frequency band notched function by inserting slot on the CPW feeding line (Qu et al., 2006) Beside these locations, it 38 ... function by inserting slots on the patch and feeding line Figure 31 (b) obtained a dual-band notch characteristic with inserting a slot on the radiating element and a slot near the radiating element...

Ngày tải lên: 21/06/2014, 11:20

... Shun-Shi Zhong School of communication and Information Engineering, Shanghai University, Shanghai 200072 China Introduction Various wideband antennas have been interesting subjects in antenna ... impedance or input impedance of the patch antenna The matching of the transmission line to the patch antenna was explained earlier in section 3.2 + VS - Zs ZG Microstrip line Z0 Z0 Matching network ... Matching network 54 ZL Fig Transmission line model of a matched patch antenna Matching of microstrip lines 5.1 Dual Band Antenna Array In this section an x inset patch antenna array, shown in figure...

Ngày tải lên: 21/06/2014, 11:20

... transition is connections between microstrip transmission lines to the IC pins, for this connection ultra wide band tapering is needed The best transition is obtained by using microstrip laminate ... hot soldering iron over nipple connection - with regard to the simulations made in HFSS for the connection of two transmission lines of boards, care should be taken to cover the connection of the ... taken into consideration - As much as possible, use a connector instead of a cable for testing Conclusion In this chapter design and implementation of a practical reconfigurable communication system...

Ngày tải lên: 21/06/2014, 11:20

... proposed in [Kopilovich, 1992; Kopilovich & Sodin, 1996] One method is a generalization of one-dimensional Leech’s construction described in section 3.1(b), that is, by multiplying one-dimensional ... determined as 0.7 considering achieving high gain, low cross-polarization level meanwhile maintaining compact mechanical structures A -12dB edge illumination, not a -10dB edge illumination usually ... optimal gain, is designed due to the need for a low sidelobe level Asymmetric illumination taper on reflector aperture plane due to offset configuration, causing degradation in secondary radiation pattern...

Ngày tải lên: 21/06/2014, 11:20

... orthogonal orientations between them, of the probe This results in two equations on Aax and Aay and it is enough to invert this linear system of equations to obtain Aax and Aay Different coordinates ... correction The feeding of each element is then considered as being proportional to the near field at the location of the element The second method uses the linear relation between the feeding of ... interest Since the mentioned effects cannot be quantified by real measurement or by simple calculation, this investigation is based on numerical calculation – simulation based on “method of moments”...

Ngày tải lên: 21/06/2014, 11:20

... Communication 251 Bi-directional mm-wave RoF System based on OFM by using DD-MZM 3.1 Bi-directional mm-wave RoF system based on OFM with IF sub-carrier In addition to the photonic generation of mm-wave, ... sub-carrier which conveys the base-band information The advantages of utilizing an IF signal consist in that first, various modulation/demodulation schemes for conveying the base-band information can be ... modulation with a large index in each arm At the combining point of DD-MZM, the two optical beams with different phases interfere with each other converting optical phase modulation into optical intensity...

Ngày tải lên: 21/06/2014, 11:20

... finding might indicate that even the convective rain events in Surabaya last longer than average rain events in Barcelona When time-to-space conversion using SST is concerned, it leads to a strong ... cumulative distribution of rain attenuation along a km link obtained using various statistics of wind velocity compared to that obtained using ITU-R method Measurement and modeling of rain intensity and ... the wind direction and link orientation are perpendicular, the link comprises only a single segment and the convolution becomes multiplication In this case, the resulting attenuation statistics...

Ngày tải lên: 21/06/2014, 11:20

... to use bond wires in designing a VCO due to design difficulties in estimating the bond wires inductances In this paper, first, we propose a design method of a VCO using on- chip CPW resonator thus ... applications whereas in designing a LCVCO, the self-resonance of inductor prevents its applications beyond that frequency Application of On- Chip CPW Resonator to Design a Digitally Controlled ... Introduction of Digitally Controlled Oscillator (DCO) Scaling down of CMOS technology and reduction in supply voltage complicates the implementation of RF integrated circuits in deep submicron...

Ngày tải lên: 21/06/2014, 11:20

... Representation of Passive Components based on Planar Waveguide Junctions 409 CPU effort is raised to 2.93 s when using the point-to-point connection technique Finally, the combination of the original integral ... proposed in this paper, we have also made use of a traditional approach based on frequency-by-frequency (point-to-point) calculations for solving the cascade connection of Z matrices (see for instance ... Communication Systems EURASIP Journal on Wireless Communications and Networking, Vol 2007, Article ID 34358, pages, Hindawi Publishing Corp., 2007 Wideband Representation of Passive Components based on...

Ngày tải lên: 21/06/2014, 11:20

... modelled by its non-linear model; moreover, the biasing network and the interconnect lines were both taken into account in the simulations As preliminary remark, due to the non-reciprocity of ... experimental demonstration in the time domain of the ability of a circuit to exhibit simultaneously gain and NGD in microwave domain is the first one available in the literature By injecting in the NGD ... us continue with the time-domain experimental characterization (d) Time-domain measurements: In order to allow operation in the specified frequency band and to meet the conditions stated in section...

Ngày tải lên: 21/06/2014, 11:20

... protection switches on It leads to additional increase in the radar blind zone The following way is utilized to minimize the response time of the receiver protection system An additional logarithmic ... following tricks were used: (i) cropping the input pulse, which reduces the contribution of the frequency modulation during leading and ending edge of the magnetron pulse to the discriminator response; ... works within Nyquist range of ADC only 4.3.5 Signal processing- a few remarks As known (see Section 0) the magnetron produces incoherent oscillations and only the introduction a corresponding signal...

Ngày tải lên: 21/06/2014, 11:20

... Positioning System GSM Global System for Mobile Communications HFBW Half-Power BeamWidth IEEE The Institute of Electrical and Electronic Engineers ISI Inter-Symbol Interference ITU International ... Telecommunications Union LPF Low-Pass Filter MSA Microstrip Antenna MS-LPDA Microstrip – Log Periodic Dipole Array PAM Pulse Amplitude Modulation PCS Personal Communications Service PPM Pulse Position Modulation ... Division Multiple Access CEPT European Conference of Postal and Telecommunications DSP Digital Signal Processing EIRP Equivalent Isotropically Radiated Power FCC Federal Communication Commission...

Ngày tải lên: 22/06/2014, 14:47

... diversity benefit) by decomposing chips into carrier components and frequency combining; and (2) the use of frequency combining in place of path combining (as done in RAKE receivers) leads to a ... combining across frequency components (to exploit frequency diversity), and (3) a combining across chips (to eliminate users in a traditional DS-CDMA manner) We can apply the combining first on ... swept in a manner which ensures constant large scale fading over symbol duration TS while ensuring L independent fades within each TS Criterion 1: Constant large-scale fading To ensure constant...

Ngày tải lên: 23/06/2014, 01:20

... systems focusing on the downlink only, the design of bidirectional mmwave RoF systems are also considered Rain-induced attenuation creates one of the most damaging effects of the atmosphere on the ... in UWB applications Due to the centimetre accuracy, UWB can be used to find a lost something or people in a various situations including fire fighters in a burning building, police officers in ... insert a slot on the feeding line UWB antenna in Figure 22 obtained the frequency band notched function by inserting slot on the CPW feeding line (Qu et al., 2006) Beside these locations, it 38...

Ngày tải lên: 27/06/2014, 01:21

... non-squinting broadside radiation patterns across the broad operating bandwidth of 48% The two resonances have been explained, and a simple formula has been provided to estimate the resonating ... Restrictions apply 2174 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL 57, NO 7, JULY 2009 Fig Measured maximum gain on the E- and H-planes Fig 3-dB beamwidth of the radiation patterns on the ... TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL 57, NO 7, JULY 2009 2173 Fig Schematic diagram antenna to 60 60 mm (0:6 0:6o at 3.0 GHz) The corresponding peak gain varies from 8.0 dBi for an in nitely...

Ngày tải lên: 10/07/2014, 01:20

... bending angles Starting with slot dimensions obtained from (1) for 6GHz, several simulations were made changing the W/L ratio We found that increasing slot dimensions the matching bandwidth increases ... the frequency band where radiation pattem does not change decreases In order to get an ultra-wide matching band maintaining the broadside maximum radiation, a longer slot bent across H-plane is ... Measured and simulated gain in broadside direction is plotted in figure Measurement '4 SirTulation Figure Input impedance from 3GHz to 6GHz Simulation and Measurernent Ga .in i Bmdrdd dheti 1~~~~~~~~~~~~~...

Ngày tải lên: 10/07/2014, 01:20

... nearly omni-directional radiation patterns Further, by employing a conducting reflecting sheet on the back of the antenna, directional radiation patterns can be obtained within the UWB range but ... GHz) For obtaining directional radiation patterns within the UWB and 10 mm can range, a combined spacing between be used Fig 6(a)–(f) show the gain radiation patterns with or 10 mm spacing for frequencies ... VERIFICATION OF THE ANTENNA The antenna was verified using the HFSS simulation for the UWB communications using the technique outlined in [19], [20], where a transmit/receive antenna combination was considered...

Ngày tải lên: 10/07/2014, 01:20