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

... microstrip highpass and bandstop fil- ters. These include quasilumped element and optimum distributed highpass filters, narrow-band and wide-band bandstop filters, as well as filters for RF chokes. ... and ␻ c is the cutoff frequency of the highpass filter. Any series in- ␻ c ⍀ c ᎏ ␻ 161 Microstrip Filters for RF/ Microwave Applications. Jia-Sheng Hong, M. J. Lancaster Copyright © 2001...

Ngày tải lên: 07/11/2013, 21:15

... spectrum is the visible optical spectrum, the ultraviolet spectrum, and x-rays. Below the microwave frequency spectrum is the radio frequency (RF) spectrum. The frequency boundary between RF and mi- ... factors of filter elements on filter performance are also discussed. Chapter 4 summarizes basic concepts and design equations for microstrip lines, coupled microstrip lines, and disconti...

Ngày tải lên: 24/10/2013, 16:15

... building elements in many areas of RF/ microwave en- gineering. Such networks are used to select/reject or separate/combine signals at different frequencies in a host of RF/ microwave systems and equipment. ... chapter to describe various network concepts and provide equations that are useful for the analysis of filter networks. 2.1 NETWORK VARIABLES Most RF/ microwave filters and filter c...

Ngày tải lên: 24/10/2013, 16:15

... describes basic concepts and theories that form the foundation for de- sign of general RF/ microwave filters, including microstrip filters. The topics will cover filter transfer functions, lowpass prototype ... bandpass, and bandstop filters will be discussed later on. 1 ᎏᎏ 1 + ␧ 2 F n 2 (⍀) 29 Microstrip Filters for RF/ Microwave Applications. Jia-Sheng Hong, M. J. Lancaster Copyright...

Ngày tải lên: 28/10/2013, 23:15

... here for easy reference. 4.1 MICROSTRIP LINES 4.1.1 Microstrip Structure The general structure of a microstrip is illustrated in Figure 4.1. A conducting strip (microstrip line) with a width ... frequency of a microstrip line. 4.2 COUPLED LINES Coupled microstrip lines are widely used for implementing microstrip filters. Figure 4.2 illustrates the cross section of a pair of coupl...

Ngày tải lên: 28/10/2013, 23:15

... 50 ohms for microstrip filters. Having obtained a suitable lumped-element filter design, the next main step in the design of microstrip lowpass filters is to find an appropriate microstrip realization ... Semilumped Lowpass Filters Having Finite-Frequency Attenuation Poles The previous two types of microstrip lowpass filter realize the lowpass prototype filters having their frequencie...

Ngày tải lên: 07/11/2013, 21:15

... of conductivity ␴ yields a surface impedance given by Z s = = Ί ๶ (7.4) where E t and H t are the tangential electric and magnetic fields at the surface. This definition of the surface impedance ... independent of fre- quency. 7.1.4 Surface Impedance of Superconductors Another important parameter for superconducting materials is the surface imped- ance. In general, solving Maxwell’s equation...

Ngày tải lên: 07/11/2013, 21:15

... external quality factors of mi- crowave coupling structures from EM simulations. 235 Microstrip Filters for RF/ Microwave Applications. Jia-Sheng Hong, M. J. Lancaster Copyright © 2001 John Wiley ... effect if their signs are opposite. Obviously, the direct evaluation of the cou- pling coefficient from (8.31) requires knowledge of the field distributions and performance of the space integr...

Ngày tải lên: 15/12/2013, 06:15

... described in Section 10.1 is chosen as an initial design. The attenuation poles at the normalized lowpass frequencies are also chosen as ⍀ = ±1.5 to meet the selectivity. The initial values for ... Schematic circuit for the edge-coupled microstrip bandpass filter for CAD. L4 = sin –1 ΂ Ί ๶ ๶ ๶ ΃ (9.39) where ␭ g and Z r are the microstrip guided wavelength and the microstrip character-...

Ngày tải lên: 15/12/2013, 06:15

... 10 Advanced RF/ Microwave Filters There have been increasing demands for advanced RF/ microwave filters other than conventional Chebyshev filters in order to meet stringent requirements from RF/ mi- crowave ... Characteristics The filter having only one pair of transmission zeros (or attenuation poles) at finite frequencies gives much improved skirt selectivity, making it a viable intermed...

Ngày tải lên: 15/12/2013, 06:15