[PDF] Top 20 Educação e exclusão social : a perspectiva dos ciganos e dos não ciganos

... Figure 5 shows the characteristics of the filter structure for different values of the length of the conductor section ‘a’ (see Figure 1). An increase of this geometric parameter leads to a slight decrease of the ... See full document

... ring resonator (SCSL-RR) and tapped feed lines are utilized together to develop a novel compact wideband ...ring resonator (UI-RR), the three resonant modes are appropriately excited to form up a ... See full document

... notched band, SRR are embedded in the I/O line without enlarging the size of the ...notched band can be controlled by adjusting the length and gap of the ...BPF using the presented multi-stub ... See full document

... with open ended stub discontinuity ...selective bandpass filter using a combination of series open ended stub and shunt short ended stub to design CPW ... See full document

... DGS resonator is ...of resonator has a compact size similar to the open-stub loaded dual-mode resonator ...of resonator, a bandpass filter is designed and ...very ... See full document

... Wideband bandpass filters play an increasingly important role in the rapid developing wireless communication, and the pros and cons of their performance directly affect the quality of the whole system of ...the ... See full document

... Since UWB communication devices occupy a large frequency spectrum (3.1–10.6 GHz), interference attenuation or avoidance with coexisting users is one of the key issues for UWB technology. A special effort has been directed ... See full document

... dual-mode stub-loaded resonator in [8–10] is formed by an open-ended stub tapped at the center of a λ/2 ...this resonator is a λ/4 resonator with the length as L e 2 , ... See full document

... lowpass filter and highpass filter in a cascade connection are used to design a wideband filter, and wideband BPFs using this kind of method have relatively large circuit ...loaded ... See full document

... of open-circuited stubs stretched close to one-eighth of a wavelength was loaded in a ring resonator, which made the first two even-order resonances move down to be quasi-equally located at two sides of the ... See full document

... microwave bandpass filters (BPFs) are widely used in wireless communication ...dual-mode resonator can be used as a doubly tuned resonant ...of filter is reduced by half, and the size of the ... See full document

... quadruple-mode stub-loaded resonator is applied to design a compact wideband BPF shown in ...The resonator can generate two odd-modes and two even-modes in the desired ...short-circuited stub ... See full document

... quad-band bandpass filter response because it is hard to achieve good matching and low insertion loss for multiple passbands, ...quad-band bandpass filter in the existing ...quadruple ... See full document

... a wide upper stopband dual-band bandpass filter (BPF) with controllable passband frequencies and bandwidths as well as a high out-of-band rejection ...impedance stub-loaded quad-mode ... See full document

... microwave bandpass filter (BPF) using dual-mode and triple-mode resonator is ...dual-band filter comprising two dual-mode single band filters using common input/out ... See full document

... In this letter, as shown in Fig. 1(a), a compact dual-mode microstrip BPF with four TZs is presented with the acute frequency-dependent S-L coupling structure. Three TZs in the upper-stopband are determined by the S-L ... See full document

... designed using the stub loaded resonators proposed in [18, 19], this design is much more flexible, but can hardly extend to high- order filters with controlled ...loaded resonator suitable for ... See full document

... dual-band filter with independently controllable bandwidths is proposed. The filter utilizes three stub- loaded resonators (two sideward resonators and one center resonator) and the ... See full document

... compact bandpass filter is one of the more convincing solutions ...multiband bandpass filters such as cascading resonators [1], multi-layered structure [2], step impedance resonator [3], stub- ... See full document

... tri-band filter have been reported. In [2], a tri-band bandpass filter is designed based on quarter-wavelength resonators with U-folded ...is stub-loaded resonator (SLR) ... See full document