Có 12+ tài liệu thuộc chủ đề "ứng dụng Microstrip"
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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...
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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...
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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...
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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...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...