The paper briefly describes a full-wave frequency-domain (FD) approach aimed at developing a SPICE-equivalent circuit model for predicting the effects of coupling of external electromagnetic fields to transmission lin...
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The paper briefly describes a full-wave frequency-domain (FD) approach aimed at developing a SPICE-equivalent circuit model for predicting the effects of coupling of external electromagnetic fields to transmission lines (TLs). The approach employs the method of moments combined with rational approximation of the desired observable, and vector fitting technique. A Norton equivalent circuit representing the TL structure at the selected port is derived from the results of FD numerical simulation. Numerical example demonstrates the usefulness and efficiency of the approach.
In this paper we propose an approach for designing wideband metamaterial antennas. Our design is based on the wave-slow down provided by coupled-TL (Transmission Line) sections that emulate anisotropic volumetric medi...
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In this paper we propose an approach for designing wideband metamaterial antennas. Our design is based on the wave-slow down provided by coupled-TL (Transmission Line) sections that emulate anisotropic volumetric media (Photonic Crystals). These sections are used to couple antenna elements arranged in an array, thus leading to very large bandwidths (10:1) even when the array is conformally installed on a ground plane.
This paper proposes a traveling wave amplifier based on composite right/left handed (CRLH) transmission lines (TLs) periodically loaded with resonant tunneling diode (RTD) pairs. This TL can be regarded as a “lossy”...
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This paper proposes a traveling wave amplifier based on composite right/left handed (CRLH) transmission lines (TLs) periodically loaded with resonant tunneling diode (RTD) pairs. This TL can be regarded as a “lossy” TL with a negative loss because of the negative differential resistance of the RTD. This means that the TL can amplify signals while the signal travels along the line. One of the most important points to be investigated to realize this amplifier is the stability of the circuit. We discuss stability of the TLs periodically loaded with RTDs, and show that they can be stabilized by using CRLH TL configuration. It is demonstrated that this amplifier can have a gain for wide frequency range.
A double-tuned matching network is proposed, which replaces one of the resonant circuits in a Wheeler matching network with a λ g /2 transmission line in order to achieve broadband and multiband matching performance....
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A double-tuned matching network is proposed, which replaces one of the resonant circuits in a Wheeler matching network with a λ g /2 transmission line in order to achieve broadband and multiband matching performance. The multiband Wheeler matching network is then applied to a circular monopole antenna, and it is demonstrated that a compact, multiband and highly efficient antenna can be achieved. The antenna operates in the frequency ranges of 1.90-4.20 GHz and 6.05-6.53 GHz, has a total size of 20 × 50.3 × 1.59 mm and exhibits efficiencies in the order of 90%.
The feasibility and design guidelines for implementing integrated transmission-line based Sigma Delta modulators (ITLSDMs) have been studied. By a systematic design methodology for wireless frequency standards, the pr...
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The feasibility and design guidelines for implementing integrated transmission-line based Sigma Delta modulators (ITLSDMs) have been studied. By a systematic design methodology for wireless frequency standards, the practical issues of realizing ITLSDMs such as different semiconductor technologies, performance, area and power consumption have been addressed. Having compared the different technologies and types of transmission lines (TLs), a typical 4th order bandpass SDM (BPSDM) as well as a 2nd order lowpass one (LPSDM) for a sampling frequency (f s ) of 10GHz and a bandwidth (BW) of 78MHz have been simulated behaviorally to obtain the minimum circuit requirements for each architecture. An area estimation approach and an optimum realization method are finally proposed which lead to reduced chip area while keeping the performance constant.
This paper proposes a wave propagation based approach to derive crosstalk and delay between two coupled RLCG interconnects in the transform domain. The increase of clock frequency into the GHz range, coupled with long...
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This paper proposes a wave propagation based approach to derive crosstalk and delay between two coupled RLCG interconnects in the transform domain. The increase of clock frequency into the GHz range, coupled with longer length interconnects of small cross-section and low dielectric strength, can result in cross coupling effects between on-chip interconnects. The traditional analysis of crosstalk in a transmission line begins with a lossless LC representation, yielding a wave equation governing the system response. In order to determine the effects that this cross talk will have on circuit operation, the resulting delays and logic levels for the victim nets must be computed. In this paper, we propose four reflection wave propagation based analytical model for estimation of crosstalk. An emphasis was made on the distributed nature of the RLCG model, thus underlining the effect of parasitic coupling inductance and conductance on present and future on-chip interconnects.
An artificial transmission line based on Barium-Strontium-Titanate (BST) thick-film is used as a phase shifter in this work. The benefits of artificial transmission lines are exploited to realize a very compact phase ...
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An artificial transmission line based on Barium-Strontium-Titanate (BST) thick-film is used as a phase shifter in this work. The benefits of artificial transmission lines are exploited to realize a very compact phase shifter with a length of 3mm for 342° differential phase shift. The prototyped phase shifter exhibits a figure of merit (FoM) of 52°/dB in the frequency range 8–10 GHz. The proposed circuit is fabricated in only one photolithography process cycle on a low cost screen printed thick-film ceramic.
Fault data synchronization for improving Two-terminal fault location algorithm is proposed. Conceptually, employing Wavelet technique, the instantaneous currents of both ends, sampled by Digital Fault Recorders (DFR),...
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Fault data synchronization for improving Two-terminal fault location algorithm is proposed. Conceptually, employing Wavelet technique, the instantaneous currents of both ends, sampled by Digital Fault Recorders (DFR), will be used to determine a transient reference point for synchronizing the DFR data before applying the Two-terminal algorithm. In the study, both symmetrical and unsymmetrical faults have been simulated for a simplified 230 kV transmission system. The case studies of applying Two-terminal fault location algorithm to the simulated unsynchronized sampled data with assumed phase-shift error varying from -180 to 180 degree, and to the corresponding synchronized data using the proposed Wavelet technique with fixed threshold are conducted for performance verification. Additionally, the effect of fault resistance in the range of 0.01 50 ohm has been investigated. In all test cases, the proposed synchronization method yields satisfactory results such that the error of fault location is independent of the phase-shift error.
Transmission lines (T-lines) and interconnects are fundamental components for the millimeter-wave (mmW) and terahertz (THz) circuits. Based on the through-silicon via (TSV) technology, three T-lines, four different in...
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Transmission lines (T-lines) and interconnects are fundamental components for the millimeter-wave (mmW) and terahertz (THz) circuits. Based on the through-silicon via (TSV) technology, three T-lines, four different interconnects, and one substrate integrated waveguide (SIW) are developed and characterized over a frequency range up to 200 GHz. The results of T-lines show that coplanar waveguide (CPW) is almost with the lowest attenuation whereas microstrip line (MSL) suffers the highest insertion loss. As for the TSV-based interconnects, the 3-D transition from grounded CPW (GCPW) to CPW performs the lowest insertion loss up to 170 GHz. The electromagnetic shock wave is explored to analyze the results and physically explain the related phenomenon. SIW is inherently a good option for the TSV-based THz circuits. However, more research work should be carried out to reduce the high dielectric loss due to the low resistivity of silicon.
In this article, a wide band harmonic suppression microstrip patch antenna using the Koch-shaped defected ground structure (DCS) is presented. In order to realize the wide band harmonious suppression, the Koch-shaped ...
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ISBN:
(纸本)9781424457052
In this article, a wide band harmonic suppression microstrip patch antenna using the Koch-shaped defected ground structure (DCS) is presented. In order to realize the wide band harmonious suppression, the Koch-shaped defected ground structure (DGS) microstrip circuit is designed as the feed part of the proposed antenna. By inserting parallel slots, the antenna can be directly fed by the simple 50ft microstrip transmission line. The proposed patch antenna operates at the center frequency of 2.5GHz and the spurious radiations up to 15GHz are properly suppressed. Simulated and measured results indicate that the Koch-shaped defected ground structure (DGS) is effective in suppressing spurious radiations. And the patch antenna considered here can be widely applied in active integrated communication systems.
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