By Ferran Mart?n
This booklet offers and discusses possible choices to bland transmission traces for the layout and implementation of complex RF/microwave parts in planar technology.
This publication is dedicated to the research, learn and purposes of synthetic transmission traces ordinarily applied through a number line very easily changed (e.g., with modulation of transverse dimensions, with etched styles within the metal layers, etc.) or with reactive loading, on the way to in achieving novel equipment functionalities, improved functionality, and/or decreased measurement.
The writer starts off with an introductory bankruptcy devoted to the basics of planar transmission strains. bankruptcy 2 is concentrated on man made transmission strains in accordance with periodic constructions (including non-uniform transmission traces and reactively-loaded lines), and gives a finished research of the coupled mode concept. Chapters three and four are devoted to synthetic transmission traces encouraged by way of metamaterials, or in line with metamaterial ideas. those chapters comprise the most useful implementations of such strains and their circuit versions, and a large evaluate in their RF/microwave purposes (including passive and energetic circuits and antennas). bankruptcy five specializes in reconfigurable units in line with tunable synthetic traces, and on non-linear transmission traces. The bankruptcy additionally introduces numerous fabrics and parts to accomplish tuning, together with diode varactors, RF-MEMS, ferroelectrics, and liquid crystals. eventually, bankruptcy 6 covers different complex transmission traces and wave guiding buildings, equivalent to electroinductive-/magnetoinductive-wave traces, common-mode suppressed balanced strains, lattice-network synthetic traces, and substrate built-in waveguides.
Artificial Transmission strains for RF and Microwave purposes presents an in-depth research and dialogue of synthetic transmission strains, together with layout guidance that may be important to researchers, engineers and students.
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Extra resources for Artificial Transmission Lines for RF and Microwave Applications
69). 68), the loss tangent can be finally obtained. 23 It is assumed that radiation from the ring is negligible (valid at moderate frequencies) ; hence, the contribution of radiation loss to the attenuation constant is null. 25 LOSSY TRANSMISSION LINES Alternatively, the dielectric constant and the loss tangent of thin film un-clad substrates and low-loss sheet materials can be measured by means of specific instrumentation, namely, a split cylinder resonator. , the sample is loaded in the gap between the two cylinder halves).
Conduction losses, associated to the presence of free electrons in the dielectric material (it is assumed that the material exhibits a nonzero conductivity), do also contribute to the imaginary part of the complex permittivity. The conduction current density is related to the electric field through the Ohm law: J =σE 1 61 where σ is the conductivity of the material. 62), it is clear that the effects of conduction losses can be accounted for by including a conductivity dependent term in the imaginary part of the complex permittivity.
89) in the limit of wide strips (W/h >> 1). 5 COMPARATIVE ANALYSIS OF PLANAR TRANSMISSION LINES The objective of this subsection is to briefly highlight some advantages and limitations of planar transmission lines from a comparative viewpoint. The most used transmission lines for the implementation of planar distributed circuits are microstrip lines and CPWs because no more than two metal levels are needed for their implementation. Striplines are closed and shielded structures, but they require three metal levels and their use is very limited.