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Sử dụng lò vi sóng

Sử dụng lò vi sóng

Ngày tải lên : 28/08/2013, 18:19
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Sử dụng lò vi sóng

Sử dụng lò vi sóng

Ngày tải lên : 17/09/2013, 20:10
... - 10:06 AM Lò nấu vi s ng Lò Vi s ng (Microwave oven - s ng cực ngắn) hiện nay đã ngự trị trong bếp của nhiều gia đình cũng như tại công s , trường học…. Dân giầu có thì s m một gắn vào tường ... (pacemaker) các y cụ này đều được che chở chống phóng xạ hoặc vi s ng. â Copyright 2000-2003 Vinacomm, all rights reserved. S dng phiờn bn 2.0 ca phn mm iCMS đ Ghi r nguồn "irv.moi.gov .vn& quot; ... nổ. Lò vi ba cũng thường được dùng để hâm s a cho trẻ thơ. Vài điều cần để ý là: - S phân phối s c nóng trong vi ba không đồng đều, nên nhiều khi bên ngoài bình s a thấy lạnh mà s a trong...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P1)

Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P1)

Ngày tải lên : 24/10/2013, 16:15
... applications. The study starts with a brief discussion of typical HTS subsystems and RF modules that include HTS microstrip filters for cellular base stations. This is followed by more detailed descriptions ... provide more accurate design with less design iterations, leading to first-pass or tuneless filters. This chapter discusses computer simulation and/or computer optimization. It summarizes some basic ... cascaded quadruplet (CQ) fil- ters, trisection and cascaded trisection (CT) filters, cross-coupled filters using transmission line inserted inverters, linear phase filters for group delay equaliza- tion,...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P2)

Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P2)

Ngày tải lên : 24/10/2013, 16:15
... variables are called scattering transmission or transfer parameters, de- noted by T, and the matrix containing the all T parameters is referred to as scattering transmission or transfer matrix. If ... two or more simpler networks appears to be used most frequently in analysis and design of filters. This is because most filters consist of cascaded two-port components. For simplicity, consider ... analysis. For a reciprocal network S 12 = S 21 . If the network is symmetrical, an additional property, S 11 = S 22 , holds. Hence, the symmetrical network is also reciprocal. For a lossless passive...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P3)

Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P3)

Ngày tải lên : 28/10/2013, 23:15
... plane where t is defined is called the t- plane. Equation (3.51) is referred to as Richards’ transformation. For lossless pas- sive networks p = j ␻ and the Richards’ variable is simply expressed ... as the Gaussian lowpass prototype filters, since the Gaussian filters are all-pole filters, as the Butterworth or Chebyshev filters are. The element values of the Gaussian prototype filters are ... is increased. Therefore, filters de- signed using immittance inverter theory are best applied to narrow-band filters. 3.5 RICHARDS’ TRANSFORMATION AND KURODA IDENTITIES 3.5.1 Richards’ Transformation Distributed...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P4)

Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P4)

Ngày tải lên : 28/10/2013, 23:15
... discontinuities are still useful whenever they are appropriate. These expressions are used in many circuit analysis programs. There are numerous closed- form expressions for microstrip discontinuities available ... mi- crostrip patch resonators is their lower conductor losses as compared with narrow microstrip line resonators. Although patch resonators tend to have a stronger radia- tion, they are normally ... literature, they are summarized here for easy reference. 4.1 MICROSTRIP LINES 4.1.1 Microstrip Structure The general structure of a microstrip is illustrated in Figure 4.1. A conducting strip (microstrip...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P5)

Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P5)

Ngày tải lên : 07/11/2013, 21:15
... capacitance C 6 shorts out transmission by having infinite shunt susceptance. A microstrip filter structure that can realize, approximately, such a filtering char- acteristic is illustrated in Figure 5.6(b), ... However, if the removal of all lumped capacitors is desired for stripline realization, a staggered stripline resonator array may be used to restore a 5.2 BANDPASS FILTERS 149 FIGURE 5.23 (a) A ... 5.1.3 Semilumped Lowpass Filters Having Finite-Frequency Attenuation Poles The previous two types of microstrip lowpass filter realize the lowpass prototype filters having their frequencies of...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P6)

Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P6)

Ngày tải lên : 07/11/2013, 21:15
... Chebyshev lowpass prototype with a passband ripple of 0.1 dB is chosen for design a microstrip bandstop filter, as shown in Figure 6.8. The mi- crostrip bandstop filter uses L-shaped resonators coupled ... short-circuited, quarter-wavelength resonators having one end short-circuited. A simple and general approach for design of narrow-band bandstop filters is based on reactance/susceptance slope parameters of the resonators. ... parameters. A practical and general tech- nique that allows one to extract slope parameters of microwave bandstop resonators using EM simulations or experiments is discussed next. Consider a two-port...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P7)

Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P7)

Ngày tải lên : 07/11/2013, 21:15
... lowpass or bandstop filters because of their frequency characteristics. However, these PBG structures can be integrated with many microstrip filters discussed in the previous chapters to improve ... structures. Before we discuss ferroelectric tunable filters, some properties of ferroelectric ma- terials will be described first. 7.2.1 Ferroelectric Materials A ferroelectric material exhibits spontaneous ... films [18–44]. For the design of HTS microstrip filters, it is essential to understand some important properties of superconductors and substrates for growing HTS films. These will be described...
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Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P8) doc

Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P8) doc

Ngày tải lên : 15/12/2013, 06:15
... load or port to form a two-port network, as Figure 8.13 shows, where T–TЈ represents the symmetrical plane and the single LC resonator has been separated into two symmetrical parts. When the symmetrical plane ... two resultant coupling coefficients should have different signs. Another two pairs of coupled microstrip resonators are considered next , they are the mixed coupling structures shown in Figure ... g 2 for the synchronous tuning, and d = 0 for a zero offset. Shown in Figure 8.16 are typical simulated resonant frequency responses of the coupled resonator structures in Figure 8.15(a) and (b), respectively,...
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Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P9) doc

Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P9) doc

Ngày tải lên : 15/12/2013, 06:15
... these cells. Larger cells yields faster simulations, but at the expense of larger errors. Errors are diminished by using smaller cells, but at the cost of longer simulation times. It is important ... more accurate design with less design iterations, leading to first-pass or tuneless filters. This not only re- duces the labor intensiveness and so the cost, but also shortens the time from design to ... a filter, which are realized using microstrip or other microwave transmission line structures. Usually, there are various constraints on the designable parameters for a feasible solution obtained...
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Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P10) pptx

Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P10) pptx

Ngày tải lên : 15/12/2013, 06:15
... results are plotted in Figure 10.17. 10.4 ADVANCED FILTERS WITH TRANSMISSION LINE INSERTED INVERTERS 10.41 Characteristics of Transmission Line Inserted Inverters An ideal immittance inverter ... linear phase filters. 10.6.1 Extracted Pole Synthesis Procedure Since most transfer functions may be realized by lowpass prototype filters with a symmetrical cross-coupled double array network, ... four filters show asymmetric frequency responses with one or two finite fre- quency attenuation poles on the either side of the passband. This is because the transmission line inserted inverters...
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Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P11) ppt

Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P11) ppt

Ngày tải lên : 15/12/2013, 06:15
... bandpass fil- ters. Figure 11.29 shows the structure of an aperture-coupled, microstrip, open-loop resonator bandpass filter, which consists of two arrays of microstrip open-loop resonators that are ... can then represent the resonator. To demonstrate the characteristics of this type of slow-wave resonator, a single resonator was first designed and fabricated on a RT/Duroid substrate having a thickness ... size compared with other filters such as waveguide filters. Nevertheless, for some applications where the size reduc- tion is of primary importance, smaller microstrip filters are desirable, even...
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Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P12) pptx

Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P12) pptx

Ngày tải lên : 15/12/2013, 06:15
... fabrication errors. Among several possible error sources we have identified that the thickness of the substrates used is a main source. The tolerance of substrate thickness is ±5%. This tolerance ... factor against the substrate thickness. (b) Simulated relative frequency shift of microstrip, meander, open-loop resonators against the substrate thickness. three loss mechanisms should usually ... Microstrip Circuit LNA FIGURE 12.2 RF module with dual-sided six channels of HTS microstrip filters and LNAs. 12.3 PRESELECT HTS MICROSTRIP BANDPASS FILTERS 12.3.1 Design Considerations As has been described early...
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Tài liệu RF và mạch lạc lò vi sóng P1 ppt

Tài liệu RF và mạch lạc lò vi sóng P1 ppt

Ngày tải lên : 15/12/2013, 11:15
... Microwave Solid-State Devices Devices Applications Advantages Transistors L-band transmitters for telemetry systems and phased-array radar systems; transmitters for communication systems Low cost, ... high-power microwave devices because these are easy to manufacture in comparison with circular waveguides. However, certain devices (such as rotary joints) require a circular cross-section. The ridged ... solid-state devices are listed in Table 1.4. Figure 1.5 lists some applications of microwaves. Besides terrestrial and satellite communications, microwaves are used in radar systems as well as in...
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Tài liệu RF và mạch lạc lò vi sóng P2 pdf

Tài liệu RF và mạch lạc lò vi sóng P2 pdf

Ngày tải lên : 15/12/2013, 11:15
... 2:5:31 For simplicity, we assume that the k i are real and the đrst three terms of this series are sufđcient to represent its output signal. Further, it is assumed that the input signal has two different ... that intercepts an incident power density w inc and gives an isotropically scattered power of 4pr 2 w r for a back-scattered power density. Radar cross-sections of selected objects are listed in ... Transmission Formula and the Radar Range Equation Analysis and design of communication and monitoring systems often require an estimation of transmitted and received powers. Friis transmission formula...
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