Microwave engineering using microstrip circuits by E. H. Fooks

By E. H. Fooks

This publication provides a grounding in microstrip circuits and seeks to enhance reader's wisdom from uncomplicated transmission concept to microwave sub-systems. basic proofs are supplied whereas retaining an emphasis at the actual viewpoint. labored examples, facts and layout curves, end-of-chapter difficulties and chosen references are integrated all through.

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3. 3. Microstrip coupled lines: basic configuration (a); even-mode electromagnetic field (b); odd-mode electromagnetic field (c). dielectric constant that is some kind of weighted average between the dielectric constant of the material and that of the air space above the center conductors. With different field distributions being associated with both the even and odd modes, not only is there an effective dielectric constant, but there are considerably different effective dielectric constants and phase velocities associated with the even and odd modes.

An added benefit of the symmetrical positioning of the conductors is that it prevents the launching of parasitic modes. 2) requires tight tolerances on the etched pattern alignment and additional vias to connect top and bottom strips. 2), the transmission characteristics depend on the substrate thickness h, the substrate dielectric constant ε, the width of the strip conductor W, and air-space height. Optimization of the characteristic impedance, as well as its weakest dependence on h, occurs when the position of the dielectric substrate inside the housing is somewhat asymmetrical.

6)]. 68 Rs 2π Z h   W 2  h h  2h t    dB ln −    . 6. Current distribution across microstrip conductor and ground plane. 3. 68 Rs   W    h h  4πW t    dB ln . +   1 −    1 + +   2π Z h   4h    W πW  t W    unit length  In a microstrip line, conductor losses increase with increasing characteristic impedance due to the greater resistance of narrow strips. 11)] with respect to W/h. The fabrication process of real microstrip devices creates scratches and bumps on the metal surfaces.

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