Tài liệu Lò vi sóng - không chỉ để hâm nóng potx

... Lò vi sóng - không chỉ để hâm nóng Nếu chiếc lò vi sóng nhà bạn chỉ để hâm nóng thức ăn thì có lẽ bạn đã hơi xem thường “năng lực” ... chuyên dụng cho lò vi sóng. Lò bật ở mức cao nhất, nấu chín trong 4-5 phút đến khi thịt chín kỹ hoàn toàn. Ảnh: Real Simple. Đổ một chén gạo, 2 chén nước vào tô nhỡ dùng cho lò vi sóng (thêm ... l...

Ngày tải lên: 21/02/2014, 16:20

... applications) TABLE 1.1 Millimeter-Wave Band Designation Frequency Range Designation (GHz) Q-band 33±50 U-band 40±60 V -band 50±75 E-band 60±90 W -band 75±110 D-band 110±170 G-band 140±220 Y -band 220±325 FIGURE ... Inc. ISBNs: 0-4 7 1-3 519 9-7 (Hardback); 0-4 7 1-2 243 2-4 (Electronic) and more reliable frequency and power output were obtained for radio broadcasting at frequenci...

Ngày tải lên: 24/12/2013, 17:15

... Chang Copyright # 2000 John Wiley & Sons, Inc. ISBNs: 0-4 7 1-3 519 9-7 (Hardback); 0-4 7 1-2 243 2-4 (Electronic) shunt stub, a Y -chart is used for the design. A Z-chart is more convenient for the series stub ... Comparisons Useful Frequency Potential for Range Impedance Cross-Sectional Power Active Device Low-Cost Transmission Line (GHz) Range (O) Dimensions Q-Factor Rating...

Ngày tải lên: 24/12/2013, 17:15

... quarter-wavelength 5 0- line followed by a quarter-wavelength low- impedance line as shown in Fig. P3.14. Determine the dimensions for W 1 , W 2 , l 1 and l 2 (see figure). 3.15 A four-element ... E rms is the root-mean-square (rms) value. 3.3 FAR-FIELD REGION Normally, one assumes that the antenna is operated in the far-field region, and radiation patterns are measured in the far-field region...

Ngày tải lên: 24/12/2013, 17:15

... active solid-state device. Figure 4.35 shows a general oscillator circuit, where Z D is the solid-state device impedance and Z C is the circuit impedance looking at the device terminals (driving point) ... Wireless Systems. Kai Chang Copyright # 2000 John Wiley & Sons, Inc. ISBNs: 0-4 7 1-3 519 9-7 (Hardback); 0-4 7 1-2 243 2-4 (Electronic) Figure 4.16 shows the typical result...

Ngày tải lên: 24/12/2013, 17:15

... John Wiley & Sons, Inc. ISBNs: 0-4 7 1-3 519 9-7 (Hardback); 0-4 7 1-2 243 2-4 (Electronic) The noise temperature is useful for noise factor calculations involving an antenna. For example, if an ... at the 1-dB compression point, and P in;1dB is the input power at the 1-dB compression point. Although the 1-dB compression points are most commonly used, 3-dB compression points a...

Ngày tải lên: 24/12/2013, 17:15

... Wireless Systems. Kai Chang Copyright # 2000 John Wiley & Sons, Inc. ISBNs: 0-4 7 1-3 519 9-7 (Hardback); 0-4 7 1-2 243 2-4 (Electronic) When N A ¼ 300, N B ¼ 400, we have f 0 ¼ f 0ðmaxÞ : f 0ðmaxÞ ¼ 1 ... high-Q circuits to build the oscillators (examples are waveguide cavities, dielectric resona- tors, or superconducting resonators=cavities); (2) temperature compensation cir...

Ngày tải lên: 21/01/2014, 23:20

... tracking radar: continuous-tracking radar and track- while-scan radar. The continuous-tracking radar provides continuous-tracking data on a particular target, while the track-while-scan radar supplies ... effects of pulse-to-pulse amplitude fluctuation. For simplicity, let us consider the one-dimensional monopulse tracking first. Example applications are surface-to-surface or ship-to-ship track...

Ngày tải lên: 21/01/2014, 23:20

... using a hand-held telephone or laptop computer. 243 RF and Microwave Wireless Systems. Kai Chang Copyright # 2000 John Wiley & Sons, Inc. ISBNs: 0-4 7 1-3 519 9-7 (Hardback); 0-4 7 1-2 243 2-4 (Electronic) Land ... networks (PCNs), and wireless local- area networks (WLANs). The microwave line-of-sight (LOS) point-to-point radio- links were widely used during and after World Wa...

Ngày tải lên: 21/01/2014, 23:20

... diagrams for 8-PSK, 1 6- PSK, and 16-QAM for comparison. Higher levels of QAM (6 4-, 25 6-, 1024-QAM) FIGURE 9.11 Constellation diagrams of signals for multilevel modulation. 9.4 DIGITAL SHIFT-KEYING ... Wireless Systems. Kai Chang Copyright # 2000 John Wiley & Sons, Inc. ISBNs: 0-4 7 1-3 519 9-7 (Hardback); 0-4 7 1-2 243 2-4 (Electronic) 9.5 A QPSK communication link h...

Ngày tải lên: 21/01/2014, 23:20