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Chủ đề : Lò vi sóng RF

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

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Therefore, by extension, the RF/microwave applications can be referred to as communications, radar, navigation, radio astronomy, sensing, medical instrumentation, and others that explore the us- age of frequency spectrums in the range of, say, 300 kHz up to 300 GHz (Figure 1.1). Filters play important roles in many RF/microwave applications. filters are used to select or confine the RF/microwave signals...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

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

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For this reason, voltage and current, as a mea- sure of the level of electrical excitation of a network, do not play a primary role at microwave frequencies. Most RF/microwave filters and filter components can be represented by a two-port network, as shown in Figure 2.1, where V 1 , V 2 and I 1 , I 2 are the...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

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

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FIGURE 3.1 Butterworth (maximally flat) lowpass response.. FIGURE 3.2 Pole distribution for Butterworth (maximally flat) response.. FIGURE 3.3 Chebyshev lowpass response.. FIGURE 3.4 Pole distribution for Chebyshev response.. FIGURE 3.5 Elliptic function lowpass response.. Figure 3.6 plots the two typical oscillating curves for n = 4 and n = 5. FIGURE 3.6 Plot of elliptic rational function.. Figure 3.7 shows...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

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

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However, with the presence of the two guided-wave media (the dielectric substrate and the air), the waves in a microstrip line will have no vanished longitudinal components of electric and magnetic fields, and their propagation velocities will depend not only on the material properties, but also on the physical dimensions of the mi- crostrip.. When the longitudinal components of the...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

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

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The choice of the type of response, including passband ripple and the number of reactive elements, will depend on the required specifications. Figure 5.1(a) shows a general structure of the stepped-impedance lowpass mi- crostrip filters, which use a cascaded structure of alternating high- and low- impedance transmission lines. FIGURE 5.1 (a) General structure of the stepped-impedance lowpass microstrip filters. Initially,...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

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

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This type of highpass filter can be easily designed based on a lumped-element lowpass prototype such as one shown in Figure 6.1(a), where g i denote the element values normalized by a terminating im- pedance Z 0 and obtained at a lowpass cutoff frequency c . where and are the angular frequency variables of the lowpass and highpass fil- ters...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

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

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The discovery of the HTS made world headlines since it made many practical applications of superconductivity pos- sible. In addition, due to the thermal en- ergy present in the solid, some of the electron pairs are split, so that some normal electrons are always present at temperatures above absolute zero. and more of the current flows through the inductance. As...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

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

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Shown in Figure 8.1(a) is an equivalent circuit of n-coupled resonators, where L, C, and R denote the inductance, capacitance, and resistance, respectively. in which L ij = L ji represents the mutual inductance between resonators i and j, and the all loop currents are supposed to have the same direction as shown in Figure 8.1(a), so that the voltage...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

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

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This may then be evaluated by a cost-effective factor in terms of the performance. Typical examples of the applications will be de- scribed. W 1 and l 1 are the width and length of the inductive line element. and W 2 and l 2 are the width and length of the capacitive line element. Each of the subnetworks is described...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

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

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10.1.1 Filter Characteristics. (10.2) a2 = 0. 10.1.2 Filter Synthesis. FIGURE 10.2 Lowpass prototype filter for the filter synthesis.. (10.10) S 11. for n = 4 (10.11a) Y o. FIGURE 10.3 General coupling structure of the bandpass filter with a single pair of finite-frequency zeros.. for n = 6 (10.11b) Y o. (m = n/2) (10.11c) Y o. 0 upon...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

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

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FIGURE 11.1 (a) Ladder microstrip line. 11.1.2 Ladder Microstrip Line Resonators and Filters. Figure 11.3 plots the. 11.1 LADDER LINE FILTERS 381. FIGURE 11.2 Phase velocity reduction factor (p = 2W f and l f = 0.8W).. Fig- ure 11.4(a) and Figure 11.5(a) show photographs of the two fabricated ladder line filters. The measured frequency responses of the filters are...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

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

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This is followed by more detailed descriptions of the developments of duplexers and preselect bandpass fil- ters, including design, fabrication, and measurement. The objective of the project was to construct an HTS-based transceiver for mast-mounted DCS1800 base stations.. 12.1 HTS SUBSYSTEMS AND RF MODULES FOR MOBILE BASE STATIONS. Figure 12.1 shows a block diagram of one typical sector of the...

#Bộ lọc Microstrip #ứng dụng lò vi sóng #Lò vi sóng RF #ứng dụng Microstrip #sóng viba

Lò vi sóng RF và hệ thống không dây P1

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Hertz demonstrated radio frequency (RF) generation, propagation, and reception in the laboratory. Marconi's wireless communications using the telegraph meant that a ship was no longer isolated in the open seas and could have continuous contact to report its positions. In the early 1900s, most wireless transmission occurred at very long wavelengths.. In the 1920s, the one-way broadcast was made to...

#Lò vi sóng RF #Hệ thống không dây #truyền thông không gian #hệ thống sóng RF #mạch lò vi sóng

Lò vi sóng RF và hệ thống không dây P2

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At low RF, a wire or a line on a printed circuit board can be used to connect two electronic components. They can be classi®ed into two categories: conventional and integrated circuits. They can be used for wired communications to connect a transmitter to a receiver (Cable TV is an example).. FIGURE 2.2 The currrent distribution within a wire operating...

#Lò vi sóng RF #Hệ thống không dây #truyền thông không gian #hệ thống sóng RF #mạch lò vi sóng

Lò vi sóng RF và hệ thống không dây P3

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The antenna is a key component in any wireless system, as shown in Fig. FIGURE 3.1 Typical wireless system.. FIGURE 3.2 Various antennas [2].. If the source transmitting power is P t , the power density P d in watts per square meters at a distance R from the source can be calculated by. At a distance far from the...

#Lò vi sóng RF #Hệ thống không dây #truyền thông không gian #hệ thống sóng RF #mạch lò vi sóng

Lò vi sóng RF và hệ thống không dây P4

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Various Components and Their System Parameters. Figure 4.1 shows a brief history of microwave technologies. These components can be represented by the symbols shown in Fig.. FIGURE 4.1 History of microwave techniques: (a) technology advancements. FIGURE 4.2 Symbols for various components.. A directional coupler is a four-port device with the property that a wave incident in port 1 couples power...

#Lò vi sóng RF #Hệ thống không dây #truyền thông không gian #hệ thống sóng RF #mạch lò vi sóng

Lò vi sóng RF và hệ thống không dây P5

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The input signal to the receiver is in the frequency range of 20–470 MHz. Other receiver examples are shown in Fig. Most components shown in Figs. This chapter will discuss the system parameters of the receiver.. The performance of the receiver depends on the system design, circuit design, and working environment. For the output signal to be useful, the signal...

#Lò vi sóng RF #Hệ thống không dây #truyền thông không gian #hệ thống sóng RF #mạch lò vi sóng

Lò vi sóng RF và hệ thống không dây P6

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Figure 6.1 shows a typical transmitter block diagram. The output signal could be upconverted to a higher frequency.. The power amplifiers are used to increase the output power before it is transmitted by an antenna. To have a low phase noise, the oscillator or local oscillator can be phase locked to a low-frequency crystal oscillator. Power output and operating frequency:...

#Lò vi sóng RF #Hệ thống không dây #truyền thông không gian #hệ thống sóng RF #mạch lò vi sóng

Lò vi sóng RF và hệ thống không dây P7

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The nature of an echo signal provides information about the target—range, direction, and velocity.. Although radar cannot reorganize the color of the object and resolve the detailed features of the target like the human eye, it can see through darkness, fog and rain, and over a much longer range. It can also measure the range, direction, and velocity of the...

#Lò vi sóng RF #Hệ thống không dây #truyền thông không gian #hệ thống sóng RF #mạch lò vi sóng

Lò vi sóng RF và hệ thống không dây P8

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Three such satellites can provide services covering all major population centers in the world. Wireless personal and cellular communications have enjoyed the fastest growth rate in the telecommunications industry. The received power is P r and the distance is R. The received power can be calculated in the following if we assume that there is no atmospheric loss, polarization mismatch,...

#Lò vi sóng RF #Hệ thống không dây #truyền thông không gian #hệ thống sóng RF #mạch lò vi sóng