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The paper presents a new modeling of three-coupled-lines by considering the cross-coupling between non-adjacent-coupled lines. A simulation based method is proposed to extract the cross-coupling. A synthesis method is then proposed to design the wideband filter composed of three-coupled-lines. As an example, a two-section three-line filter is synthesized, simulated and experimentally realized. The...
An ultra-wideband bandpass filter (UWB) consisting of stepped-impedance resonators cascaded by parallel-coupled two-line and three-line structures is designed to satisfy Federal Communications Commission (FCC)'s spectrum mask. Firstly, a simpler equivalent circuit for the parallel-coupled three lines is derived based on the transmission line theory. Then, after the derivation of the Chebyshev-type...
In this paper, the characteristics of a microstrip tab-coupled stub-loaded ring resonator are investigated, and design formulas for determining the 3dB bandwidth, passband reflection zeros, and transmission zeros of the resonator are derived based on the even- and odd-mode analysis of the equivalent circuit of the resonator. Design examples are provided which reveal that with appropriate choices of...
A novel methodology is proposed for the design of ultra-wideband filters by the combination of the transmission-line-theory-based frequency-transformation technique to a recently-proposed Chebyshev-filter-based synthesis technique. Firstly, the frequency-transformation technique is mathematically formulated and applied to the basic distributed transmission-line elements — short-circuited shunt stubs,...
A novel filter prototype composed of multistage of stepped impedance resonators (SIRs) is proposed to realize the ultra-wideband bandpass (UWB) filter. The relation between the modes number and stage number of resonators is firstly discussed, followed by the derivation of the corresponding Chebyshev filtering function. Furthermore, the equivalent circuit model of this new filter prototype is established...
A transmission-line-theory-based novel synthesis theory is proposed to design an ultra-wideband bandpass filter to meet Federal Communications Commission (FCC)'s spectrum limit. One-wavelength parallel coupled stepped-impedance resonators (SIRs) are used to achieve a fraction passband from 3.1 GHz to 10.6 GHz (greater than 100%). An unsymmetrical SIR is employed to replace the conventional centrally-symmetrical...
The soaring clocking frequency and integration density demand robust and stable power delivery to support tens of millions of transistor switching. In this paper, we consider the problem of minimizing the area of wires and decoupling capacitors (decaps) for a power delivery network, subject to the limit on integral of voltage drops. First, we derive the gradients of constraint function without Tellegen's...
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