fundamentals and its application in science
ULTRA WIDEBAND COMMUNICATIONS: NOVEL TRENDS – ANTENNAS AND PROPAGATION ppt
... presenting a brief history of UWB radiating elements, and continues explaining the theory behind the frequency independent antennas and the feeding techniques, and finally, suggests a complete design ... multifunctional antennas, pointing out all the main features, advantages and drawbacks, in a quick and easy-tounderstand way before going into the details The chapter starts with presenting a brief history ... certain dependency on the system bandwidth Accurate modeling and improved physical understanding of pulse reflection from dispersive media is crucial in a number of applications, including optical...
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Thiết kế và mô phỏng broadband planar monopole antennas
... [1] Girish Kumarand, K.P.Ray, 2003 Broadband microstrip antennas ArtechHouse London [2] Lưu Văn Hoan, 2008 Thiết kế anten vi dải băng rộng Luận văn tốt nghiệp đại học ngành Thông tin vô tuyến Hà ... tìm hiểu thiết kế Boadband Planar Monopole Antennas Đồng thời sử dụng phần mềm Ansoft HFSS để thiết kế mô Đồ án gồm chương : Chương 1: Lý thuyết chung anten Chương 2: Boadband Planar Monopole Antennas ... 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...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 1 ppt
... The broadband input impedance and the high gain are obtained in the calculation and the measurement During the past few decades, there has been growing interest in the use of microwave and millimeter ... and spacing (see Fig 5(a)) Notice that, as in the case of many other planar transmission lines, the intrinsic impedance decreases for increasing strip widths This in turn suggests that matching ... frequency band in UWB antenna are summarized and introduced in this part Finally, we will simply forecast the development and application of the UWB communications in the future 20 Microwave and Millimeter...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 2 pdf
... 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 the ... tapered slot in the ground plane and microstrip feeding line But the latter could have a wide bandwidth by inserting rectangular slot on the feeding line And Figure 18 (c) shows a planar miniature ... frequency bands such as inserting slots, removing narrowband resonant structure, using fractal structure, using optimization algorithm and using metamaterial structures are introduced In addition,...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 3 pptx
... 14 Input impedance (real and imaginary) of the path with radiating and non-radiating feed Verification can also be done using a full 3D field solution comprising the patch, finite substrate, finite ... engaged in the printed wide-slot antenna and have realized the ultra-wideband property through a combination of changing the slot shape and using different feeding structures Fig.17 shows two kinds ... improvement in bandwidth characteristics indicated in figure 10 with respect to figure indicates the importance of providing a quarter wave transformer in terms of the return loss and bandwidth...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 4 doc
... matching, balanced matching and matching with negative feedback [Gonzalez, 1997] In this section, lossy matching combined with reactive matching is used to increase the bandwidth of amplifier and ... and isolation of two ports are shown in fig 7-a and 7-b The final experimental result is a divider block with 3dB insertion loss and 1dB of flatness and minimum 20dB isolation in frequency bandwidth ... wideband Test Bed in X-Band 91 100 nsec steps (the maximum delay can be increased, independently) In this design delay control commands (4bits) are entered to the decoder to make 16 bits commands...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 7 docx
... clearly distinguished In Fig 12, the outline and windows of the building and even the outline of the tree nearby can be seen in the image Two air-conditioners on the wall of the building can also ... restricted by introducing some definite principles in placing antennas, it is not unrealistic to search out all the possibilities involved in them Fortunately, there are apparent regular patterns in the ... are summarized And some original work by the authors, including the restricted search method by exploiting general structure of MRLAs and combinatorial methods for constructing thinned circular...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 8 docx
... The sampling spacing on the measurement surface is /2 following rectilinear axis (planar and cylindrical scanning) and /2(R+) for angular variable (cylindrical and spherical scanning), R is ... The interference between ground plane and receiving antenna and its effect on the radiated EMI measurement uncertainty 215 11 X The interference between ground plane and receiving antenna and its ... 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 systems comparison In the case of planar cartesian and...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 9 potx
... influence on array beampatterns 241 are used This effect can be increased depending on the sensor spacing and the directive factor In Table 2, SLL1 and SLL versus steering angle, spacing and ... 0916-8516 M Brandstein, and D Ward (2001) Microphone Arrays Signal Processing Techniques and Applications, Springer-Verlag, ISBN 3-540-41953-5, Berlin M Bray, D Werner, D Boeringer, and D Machuga ... first sidelobe level C=1 a) Spacing=λ/2 and θ0=0º; b) Spacing=λ/2 and θ0=20º; c) Spacing=0.25λ and θ0=0º; d) Spacing=0.25λ and θ0=20º Analysis of directive sensor influence on array beampatterns...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 10 potx
... 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 attenuation ... obtained from SST on East-West and North-South links compared to those from the three-segment link Modelling of rain intensity and attenuation 3.1 Space-time distribution of rain intensity and ... measured rain events in Indonesia have been the focus of this project, primarily due to the difficulty in implementing rain-resistant systems in microwave and millimeter-wave bands in tropical...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 12 ppt
... impedance-matching circuit for a 2.4 GHz RF front-end (Kanaya et al., 2006) and for 5GHz band power amplifier (Pokharel et al., 2008) using impedance inverters In designing the matching circuits using impedance ... area by about 30% than using spiral inductors for 2.4GHz-band applications and 40% for GHz-band applications However, the applications of on-chip CPW resonators in designing other components such ... the applications of broadband amplifiers and background information in section Section discusses the considerations of transistors and inductive components in standard CMOS process for broadband...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 14 pot
... communication and radar sensor applications Various millimeter-wave multi-port circuits covering the Ka, V and W bands are presented and analyzed In addition, a Ka band demodulator and a W-band radar ... series in (71) and (73) Then, after solving analytically the infinite summations when k (Gradstheyn and Ryzhik, 1980), we obtain the following expressions for the functions f TE 406 Microwave and ... are both characterized in terms of wideband impedance/admittance matrices Then, an efficient iterative algorithm for combining such matrices, and finally providing the wideband generalized impedance...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 15 pdf
... simultaneously gain and NGD in microwave domain is the first one available in the literature By injecting in the NGD circuit a sufficiently smoothed input short-pulse modulating a sine carrier, we ... losses and (b) S21-parameter and isolation loss Fig 5(a) shows that, in a frequency band of about 135 MHz in width and centred around 622 MHz, the gain and the group delay are better than dB and ... S-parameters, S11, S21 and S22, are within envelop limits with absolute differences less than dB Input- and output-matchings and gain flatness are kept This confirms the relevance of cascading different...
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Micowave and Millimeter Wave Technologies Modern UWB antennas and equipment Part 17 doc
... Fig 3) In part it determines the ability of the radar to resolve targets with different velocities and reflectivity in the same range bin, e.g clouds in a strong rain or a moving target in presence ... the magnetron wit ou utput and the ma agnetron; and (vi protection and decoupling circuits From a vari i) d iety of mo odulator types be eing in use, a line modulator and a modulator wit partial ... attitude to start producing oscillations not during the front of the modulation pulse but during its trailing edge in opposite In this case the delay between the triggering pulse and RF pulse may be...
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microstrip – log periodic antenna cho hệ thống uwb
... Global 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 ... Standing Wave Ratio TH Time Hopping UWB Ultra – Wide Band Trang SVTH : NGUYỄN HOÀI ANH GVHD : Th.S NGUYỄN DƯƠNG THẾ NHÂN PHẦN I : XÂY DỰNG CƠ SỞ LÝ THUYẾT CHƯƠNG : TỔNG QUAN VỀ ULTRA - WIDE BAND ... Processing Gain thu: PG2 = 10 log10 ( Với Tf ) Tp (1.3) Tf : Khung thời gian dịch (Time hopping frame) Tp : Độ rộng xung ( Impulse Width) Do đó, độ lợi tổng tiến trình (Total Processing Gain) tổng...
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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
... 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 ... (2) 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 ... presents receiver structures employing equal gain combining (EGC) across frequency components followed by minimum mean square error combining (MMSEC) across time domain components Section presents...
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Microwave and Millimeter Wave Technologies: Modern UWB antennas and equipment doc
... The broadband input impedance and the high gain are obtained in the calculation and the measurement During the past few decades, there has been growing interest in the use of microwave and millimeter ... corners and ultra wideband dipole antenna having a wideband property in Figure The former improved its properties, better return loss in high frequency, smaller size and high gain, by inserting round ... tapered slot in the ground plane and microstrip feeding line But the latter could have a wide bandwidth by inserting rectangular slot on the feeding line And Figure 18 (c) shows a planar miniature...
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UWB Antenna TOH ppt
... the coupling between the n-shaped microstrip line and patch is reduced A parametric study of this antenna, by varying the length Lbottom and height H2 of the n-shaped feeding line, and height ... Maximum gain, boresight gain, and reflection coefficient plots for configurations A (original), B (extended patch height), and C (extended n-shaped feed line), using simulator [1] First Report and Order ... ( = mm), E ( = mm), and F ( = mm), using simulator with in nite ground plane H : H : H : Fig shows the impedance bandwidth and gain profile when height = mm (620%), using in nite ground plane...
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UWB Slot Antenna In the 3-9GHz band ppsx
... that increasing slot dimensions the matching bandwidth increases and the frequency band where radiation pattem does not change decreases In order to get an ultra-wide matching band maintaining ... frequency band 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 ... deterioration We built a prototype increasing the dimensions published in [3] and bending the antenna 580 An absorber sheet was added in order to correct undesired sidelobes and back radiation Measurements...
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UWB Antenna Rạgopal doc
... received the B.Eng degree in electronics and telecommunication from Thakur College of Engineering and Technology, Mumbai, India, in 2006, and the M.Sc degree in electrical engineering from San Diego ... University, San Diego, California, in 2008 His main research interests are in small, planar and broadband antennas including ultrawideband antennas for handheld wireless applications Authorized licensed ... Kamla Nehru Institute of Technology, Sultanpur, India and the Ph.D degree from the Institute of Technology, Banaras Hindu University, Varanasi, India, in 1991 and 1997, respectively, both in electronics...
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