Lossy effects on the transient propagation in LTCC coplanar waveguides (CPWs)

Abstract

The effects of dielectric, radiative leakage and ohmic losses in CPWs on the propagation of Gaussian and sinusoidally modulated Gaussian pulses are investigated. These CPWs are assumed to be fabricated on a single‐layer low‐temperature co‐fired ceramic (LTCC) substrate. It is shown that, based on the improved empirical formula for accurate prediction of the ohmic attenuation constant presented by Liao et al., the lossy effects in LTCC CPWs are dominated by the ohmic loss of the center and ground conductive planes in the frequency range up to 40 GHz. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 94–97, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11137

Design of microstrip ultrafast pulses interconnect for THz-analog and digital applications

“…It is due to delay in the propagation of high-frequency components of the pulse. It results in ringing at the leading and trailing edges of the pulse due to the overemphasis of high-frequency components [39][40][41][42].…”

Distortion of a square pulse wave with finite rise time in edge‐coupled microstrip lines on LTCC substrate

“…The geometry of edge-coupled microstrip lines on a single-layer LTCC is shown in Figure 1(a), where the LTCC thickness is D, the width of each of the two strips is W, and the strip spacing is S. Physically, the permittivity and loss tangent of LTCCs, as used in [8], can be chosen as ( r , tan ␦) ϭ (4.2, 0.003), (5.9, 0.002), (7.0, 0.002), (7.8, 0.0015), (8.2, 0.002), and (10.6, 0.001), respectively. The thickness and conductivity of the two strips are characterized by t and , respectively.…”

“…The effects of ohmic-loss for microstrips with finite conductivity and thickness on pulse-wave propagation have not, however, been taken into account in previous studies, to the authors' best knowledge. It is well known that ohmic loss can cause considerable attenuation of a propagating pulse wave [8]. On the other hand, there has been a steadily growing interest in low-temperature co-fired ceramics (LTCC) used in the design of novel microstrip transmission lines or other microstrip interconnects [9 -12], due to their excellent high-frequency performances.…”

Average power-handling capability of the signal line in coplanar waveguides on polyimide and GaAs substrates including the irregular line edge shape effects

“…This is due to the use of FGCPWs in the fabrication of a large number of passive and active microwave and millimeter-wave devices. For FGCPWs, the losses usually involve the dielectric substrate, radiation leakage, and ohmic losses [3][4][5][6][7]. However, in most cases the ohmic loss is the main factor contributing to the energy dissipation of a FGCPW or a FGCPW-based device [8,9].…”