lò vi sóng sharp r 21a1 s vn

TổNG HợP MộT Số BENZALDEHYDE (2,3,4,6-TETRA - O - AXETYL- ò - D - GALACTOPYRANOZYL) THIOSEMICACBAZON THế BằNG PHảN ứNG TRONG Lò VI SóNG Và CHƯNG CấT HồI LƯU

... - 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 lò gắn vào tường ... (pacemaker) vì 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 lò 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)

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... applications.The study starts with a brief discussion of typical HTS subsystems and RF modulesthat include HTS microstrip filters for cellular base stations. This is followed bymore detailed descriptions ... provide more accurate design with less design iterations, leading tofirst-pass or tuneless filters. This chapter discusses computer simulation and/orcomputer optimization. It summarizes some basic ... cascaded quadruplet (CQ) fil-ters, trisection and cascaded trisection (CT) filters, cross-coupled filters usingtransmission line inserted inverters, linear phase filters for group delay equaliza-tion,...

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

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... variables are called scattering transmission or transfer parameters, de-noted by T, and the matrix containing the all T parameters is referred to as scatteringtransmission or transfer matrix. If ... two or more simpler networks appears to be usedmost frequently in analysis and design of filters. This is because most filters consistof cascaded two-port components. For simplicity, consider ... analysis. Fora 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 losslesspassive...

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

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... 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 lowpassprototype filters, since the Gaussian filters are all-pole filters, as the Butterworth orChebyshev 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 IDENTITIES3.5.1 Richards’ TransformationDistributed...

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

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... discontinuities are still useful whenever they are appropriate. Theseexpressions 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 narrowmicrostrip 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 LINES4.1.1 Microstrip StructureThe general structure of a microstrip is illustrated in Figure 4.1. A conducting strip(microstrip...

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

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... capacitance C6shorts out transmissionby 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 forstripline realization, a staggered stripline resonator array may be used to restore a5.2 BANDPASS FILTERS149FIGURE 5.23 (a) A ... 5.1.3 Semilumped Lowpass Filters Having Finite-FrequencyAttenuation PolesThe previous two types of microstrip lowpass filter realize the lowpass prototypefilters having their frequencies of...

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

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... Chebyshev lowpass prototype with a passband ripple of 0.1 dBis 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 isbased 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 resonatorsusing EM simulations or experiments is discussed next.Consider a two-port...

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

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... lowpassor bandstop filters because of their frequency characteristics. However, these PBGstructures can be integrated with many microstrip filters discussed in the previouschapters to improve ... structures.Before we discuss ferroelectric tunable filters, some properties of ferroelectric ma-terials will be described first.7.2.1 Ferroelectric MaterialsA ferroelectric material exhibits spontaneous ... films [18–44]. For the designof HTS microstrip filters, it is essential to understand some important properties ofsuperconductors and substrates for growing HTS films. These will be described...

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

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... load or port to form a two-port network, asFigure 8.13 shows, where T–TЈ represents the symmetrical plane and the single LCresonator has been separated into two symmetrical parts. When the symmetricalplane ... two resultant coupling coefficientsshould have different signs.Another two pairs of coupled microstrip resonators are considered next , they arethe mixed coupling structures shown in Figure ... g2for the synchronous tuning, and d =0 for a zero offset.Shown in Figure 8.16 are typical simulated resonant frequency responses of thecoupled resonator structures in Figure 8.15(a) and (b), respectively,...

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

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... these cells. Larger cells yields faster simulations, but at the expense oflarger errors. Errors are diminished by using smaller cells, but at the cost of longersimulation times. It is important ... more accurate designwith 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 designto ... afilter, which are realized using microstrip or other microwave transmission linestructures.Usually, there are various constraints on the designable parameters for a feasiblesolution obtained...

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

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... results are plotted in Figure 10.17.10.4 ADVANCED FILTERS WITH TRANSMISSION LINE INSERTEDINVERTERS10.41 Characteristics of Transmission Line Inserted InvertersAn ideal immittance inverter ... linear phase filters. 10.6.1 Extracted Pole Synthesis ProcedureSince most transfer functions may be realized by lowpass prototype filters with asymmetrical 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 thetransmission line inserted inverters...

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

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... bandpass fil-ters.Figure 11.29 shows the structure of an aperture-coupled, microstrip, open-loopresonator bandpass filter, which consists of two arrays of microstrip open-loopresonators that are ... can then represent the resonator.To demonstrate the characteristics of this type of slow-wave resonator, a singleresonator was first designed and fabricated on a RT/Duroid substrate having athickness ... size compared with other filterssuch as waveguide filters. Nevertheless, for some applications where the size reduc-tion is of primary importance, smaller microstrip filters are desirable, even...

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

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... fabrication errors. Among several possible error sources we haveidentified that the thickness of the substrates used is a main source. The tolerance ofsubstrate thickness is ±5%. This tolerance ... factor against thesubstrate thickness. (b) Simulated relative frequency shift of microstrip, meander, open-loop resonatorsagainst the substrate thickness. three loss mechanisms should usually ... MicrostripCircuitLNAFIGURE 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 ConsiderationsAs has been described early...

Tài liệu RF và mạch lạc lò vi sóng P1 ppt

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... Microwave Solid-State DevicesDevices Applications AdvantagesTransistors L-band transmitters for telemetrysystems and phased-array radarsystems; transmitters forcommunication systemsLow cost, ... high-power microwavedevices because these are easy to manufacture in comparison with circularwaveguides. However, certain devices (such as rotary joints) require a circularcross-section. The ridged ... solid-state devices are listed in Table 1.4.Figure 1.5 lists some applications of microwaves. Besides terrestrial and satellitecommunications, 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

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... 2:5:31For simplicity, we assume that the kiare real and the đrst three terms of this series aresufđcient to represent its output signal. Further, it is assumed that the input signalhas two different ... that intercepts anincident power density wincand gives an isotropically scattered power of 4pr2w r fora back-scattered power density. Radar cross-sections of selected objects are listedin ... Transmission Formula and the Radar Range EquationAnalysis and design of communication and monitoring systems often require anestimation of transmitted and received powers. Friis transmission formula...