d dot analysis using two component ginzburg landau equations
ULTRA WIDEBAND COMMUNICATIONS: NOVEL TRENDS – ANTENNAS AND PROPAGATION ppt
Ngày tải lên :
29/06/2014, 13:20
... dual-slope model of the normalized mean PL (5) is proposed in (22) and (63) for different distance regions ⎧ d ⎨ 10 n1 log10 d0 d D (6) PL D (d) = d ⎩ PL D + 10 n2 log 10 d0 d > D 33 Ultra-Wideband (UWB) ... impedance bandwidth starting at GHz Printed disc monopole antennas are designed in chapter 10 which could be treated as a good candidate for current and future ultra wideband applications, due ... 1556 1557 Fig Measured optical power spectra corresponding to Ein ( t ) (dashed, black), EHNLF ( t ) (dotted, blue), E+ ( t ) (solid, magenta) and E− ( t ) (dashed-dotted, red) The experimental...
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Thiết kế và mô phỏng broadband planar monopole antennas
Ngày tải lên :
21/08/2015, 16:38
... 2.19: Giá trị S11 p=0.1cm giá trị d= 3cm d= 5cm Hình 2.20: Giá trị S11 p=0.2 cm giá trị d= 3cm, d= 5cm d= 7cm Hình 2.21: Giá trị S11 p=0.3 cm giá trị d= 3cm, d= 5cm d= 7cm Hình 2.21: Hình mô HFSS Hình ... 225-400 MHz : Trong ví d sau, ta sử d ng d i tần số 225-400MHz cho anten ứng d ng lĩnh vực quốc phòng Để trải d i d i tần số 225-400 MHz cho ứng d ng quốc phòng, người ta thường sử d ng Planar Monopole ... < 2D2 / λ, D kích thước lớn anten Vùng trường xa (Far-field (Fraunhofer) region) Nếu anten có kích thước lớn D (D phải lớn bước sóng, D > λ), vùng trường xa thường xem tồn khoảng cách lớn 2D2 ...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 1 ppt
Ngày tải lên :
21/06/2014, 11:20
... *3, D Modotto *4, C De Angelis *5, S Boscolo +6, F Sacchetto +7, M Midrio +8 #DEI, Università degli Studi di Padova *DEA, Università degli Studi di Brescia +DIEGM, Università degli Studi di Udine ... Measured differential (solid line) and common-mode (dashed-dotted line) reflection coefficients |Sdd| and |Scc|, and measured single-port reflection coefficient |S11| (dotted line) between and GHz ... thus making the proposed bow-tie an Ultra-Wideband antenna, according to the FCC definition (FCC, 2002) Fig 10 Simulated (solid line) and measured (dashed-dotted line) magnitude of the reflection...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 2 pdf
Ngày tải lên :
21/06/2014, 11:20
... monopole and CPW, (2) radiationg element and (3) component to form the distrubuted matching network with the monopole The antenna in Figure 14 (d) is designed for UWB systems by using FDTD and genetic ... accidents and damages from the occurred accidents UWB Antenna 2.1 Conventional Broadband Antennas The term “Broadband” has been applied in the past, but has usually described antennas whose radiation ... and its open stub are printed on the bottom layer of it It possesses ultrawide bandwidth, uniform radiation patterns and low profile Tzyh-Ghuang Ma introduced an ultrawideband CPW fed tapered...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 3 pptx
Ngày tải lên :
21/06/2014, 11:20
... the double-feed technique combined with the tapered impedance transformer is used to obtain a wide impedance bandwidth, and an inverted U-shaped slot embedded in the microstrip feeder is adopted ... full model and the reduced model of a 8x2 dual band antenna array Patch Antennas and Microstrip Lines 57 Fig 10 VSWR characteristics of the full model and the reduced model of a 4x4 broadband antenna ... greatest drawback of a patch antenna is its narrow bandwidth Steps were taken to broaden the antenna bandwidth Two methods were used to study the antenna characteristics viz the reduced model and the...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 4 doc
Ngày tải lên :
21/06/2014, 11:20
... center frequency and 5GHz bandwidth is designed to maximize the MDS of system and minimize the out of band interference To achieve maximum bandwidth and better second order response due to implementation ... circuits' specifications of this board are discussed in the following: Divider : A wide band divider is necessary to divide signal to the detector path or delay-no delay path All important specifications ... maximum delay can be increased, independently) In this design delay control commands (4bits) are entered to the decoder to make 16 bits commands (b0-b15) and to control the delay of each 100nsec delay...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 7 docx
Ngày tải lên :
21/06/2014, 11:20
... materials and deployable mechanism The main design parameters of the antenna array are listed in Table Frequency Band Bandwidth (GHz) 8mm-band ±2 Sidelobe Level (dB)
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 8 docx
Ngày tải lên :
21/06/2014, 11:20
... and methods – Part 2-3: Methods of measurement of disturbances and immunity –Radiated disturbance measurements IEC Standard, December 2006, 185 p CISPR 16-4-2 (Ed.1.0) Specification for radio disturbance ... methods can be divided into three categories: frequency domain, time domain and eigenmode or modal solvers For antenna analysis the most suitable method are solvers in frequency domain The method ... and Mariano Raboso2 Universidad de Valladolid (Departamento de Teoría de la Señal y Comunicaciones e Ingeniería Telemática) Spain Universidad Pontificia de Salamanca (Escuela Universitaria de...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 9 potx
Ngày tải lên :
21/06/2014, 11:20
... signal applied to DD-MZM Because the bandwidth capacity is decided by the bandwidth of each optical side-mode, generated by nonlinear modulation of DD-MZM, rather than that of generated mm-wave ... amplitude of electric field input to two arms of DD-MZM; , the time delay difference between two arms of DD-MZM; , the phase difference between two RF signals; dc , the initial phase difference ... mm-wave based on high order optical side-modes generation & self-heterodyne using a DD-MZM can be configured as Figure Fig The basic arrangement of OFM by nonlinear modulation of DD-MZM DD-MZM as...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 10 potx
Ngày tải lên :
21/06/2014, 11:20
... Raindrop size distribution measurement and modelling DSD (raindrop size distribution) is a fundamental parameter that directly affects rainfall rate and rain-induced attenuation The widely used ... (seconds) the integration time, vk (D) the measured velocity in m/s of the kth drop in the diameter interval [D- D/ 2, D+ D/ 2), as opposed to a deterministic diameter-dependent velocity model such ... signal fading induced by fiber chromatic dispersion Smith et al (1997) proposed a method to generate an optical carrier with single sideband (SSB) modulation by using a DD-MZM, biased at quadrature...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 12 ppt
Ngày tải lên :
21/06/2014, 11:20
... Section discusses the considerations of transistors and inductive components in standard CMOS process for broadband amplifier design Section reviews different design techniques for broadband amplifiers ... instead of LC-tank resonator is proposed, designed and fabricated using the same technology and latter a 10 bit DCO The advantages of employing CPW resonator is the wide frequency-tuning range, and ... wave broadband amplifier applications This chapter provides the fundamental design concepts of broadband amplifier using the modern CMOS technology Various design techniques are introduced for achieving...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 14 pot
Ngày tải lên :
21/06/2014, 11:20
... and W bands are presented and analyzed In addition, a Ka band demodulator and a W-band radar sensor prototype are presented Present and future works are focused on UWB multi-port receivers and ... number of poles to be considered after connecting two wideband Z matrices, is fully described 4.1 Combination of two generalized Z matrices Let us consider two cascaded building blocks of the structure ... related to the sign of the Doppler frequency The distance measurement is obtained using two adequately spaced CW frequencies 01 and 02 The distance to the target is calculated using the measured...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 15 pdf
Ngày tải lên :
21/06/2014, 11:20
... cascaded planar waveguide junctions, which allows to model a wide variety of real passive components The proposed method provides the generalized matrices of waveguide steps and uniform waveguide ... applications, a developed study on the design of a balun using the presented frequency-independent PS is proposed in the next subsection 3.3 Design of a broadband active balun The proposed three-port ... Passive Components based on Planar Waveguide Junctions 413 when the devices under study include building blocks (i.e arbitrarily shaped 3D cavities) whose analysis through the BI-RME method typically...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 17 doc
Ngày tải lên :
21/06/2014, 11:20
... limiters provid ve ding, for example an additional d e, directional coupler and detector in order to bias the limite diode during RF pulse Howev it is hard to find a er R ver ade-off between ... non-coheren pulsed radar this space is tw dimensional, with e nt wo , coo ordinates of amp plitude and time r respectively For Doppler radar th phase and freq he quency dim mensions should be added In tru ... attenuation introduced depends on temperature and frequency rather strongly Next, every time when the switch is replaced, the corresponding P-i-N diode driver circuits should be re-adjusted in order to...
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microstrip – log periodic antenna cho hệ thống uwb
Ngày tải lên :
22/06/2014, 14:47
... ANH GVHD : Th.S NGUYỄN D ƠNG THẾ NHÂN CÁC TỪ VIẾT TẮT BPF Band-Pass Filter BW BandWidth CDMA Code Division Multiple Access CEPT European Conference of Postal and Telecommunications DSP Digital ... Wide Band Trang SVTH : NGUYỄN HOÀI ANH GVHD : Th.S NGUYỄN D ƠNG THẾ NHÂN PHẦN I : XÂY D NG CƠ SỞ LÝ THUYẾT CHƯƠNG : TỔNG QUAN VỀ ULTRA - WIDE BAND (UWB) 1.1 Giới thiệu Công nghệ Ultra – Wide ... bắt đầu sử d ng từ khoảng 20 năm trở lại đây, UWB sử d ng cho mục đích quân ứng d ng radar d tìm vật thể… Từ 14-2-2002, FCC (Federal Communication Commission) cho phép sử d ng UWB d i tần từ...
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Báo cáo hóa học: " High-Performance Wireless via the Merger of CI Chip-Shaped DS-CDMA and Oscillating-Beam Smart Antenna Arrays" potx
Ngày tải lên :
23/06/2014, 01:20
... last decade, Mr Shattil has led the development of baseband and RF processors for broadband products, and is world renowned in both academia and industry for his innovation, leadership, and 1383 ... receiver side, the transmit diversity (due to antenna array movement generated by θ(t)) corresponds to an L-fold time diversity Hence, the received signal in duration [0, TS ] can be divided into ... ratio (dB) 20 25 Traditional DS-CDMA without beam oscillation CI/DS-CDMA without beam oscillation CI/DS-CDMA with beam oscillation, EGC-EGC CI/DS-CDMA with beam oscillation, EGC-MRC CI/DS-CDMA with...
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Microwave and Millimeter Wave Technologies: Modern UWB antennas and equipment doc
Ngày tải lên :
27/06/2014, 01:21
... *3, D Modotto *4, C De Angelis *5, S Boscolo +6, F Sacchetto +7, M Midrio +8 #DEI, Università degli Studi di Padova *DEA, Università degli Studi di Brescia +DIEGM, Università degli Studi di Udine ... Measured differential (solid line) and common-mode (dashed-dotted line) reflection coefficients |Sdd| and |Scc|, and measured single-port reflection coefficient |S11| (dotted line) between and GHz ... thus making the proposed bow-tie an Ultra-Wideband antenna, according to the FCC definition (FCC, 2002) Fig 10 Simulated (solid line) and measured (dashed-dotted line) magnitude of the reflection...
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UWB Antenna TOH ppt
Ngày tải lên :
10/07/2014, 01:20
... antenna design using a broadband feeding technique has been presented and discussed This simple feeding structure coupled with the radiator has suppressed high order mode resonances at higher frequencies ... Therefore it achieved a 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 ... 1998 [16] Z N Chen and W K Toh, “Dual broadband folded antenna embedded into access-point decices,” presented at the EuCAP 2006, Nov 2006 Fig Maximum gain, boresight gain, and reflection coefficient...
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UWB Slot Antenna In the 3-9GHz band ppsx
Ngày tải lên :
10/07/2014, 01:20
... commercial code based on FDTD algorithm [6] Both can deliver radiated fields and input impedance of simulated devices IE 3D is very fast evaluating planar slots So we have employed it to study how the ... maximum slot width W and slot length L: W 16 - = - = L (2) 0.0625 The antenna was evaluated using the software packages IE 3D and XFDTD IE 3D is a commercial method of moments code [5] XFDTD is a commercial ... with a suitable matching network the antenna would be well matched over the entire desired frequency band Measured and simulated gain in broadside direction is plotted in figure Measurement '4...
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UWB Antenna Rạgopal doc
Ngày tải lên :
10/07/2014, 01:20
... are in small, planar and broadband antennas including ultrawideband antennas for handheld wireless applications Authorized licensed use limited to: Phan Phuong Downloaded on October 6, 2009 at ... communication devices Both straight feed line and tilted feed line designs were investigated with two different substrate materials of the same thickness It was observed that, for the tilted feed line Design ... matching criteria of this can also be used to reduce the back lobe radiation in handheld devices Authorized licensed use limited to: Phan Phuong Downloaded on October 6, 2009 at 04:47 from IEEE...
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