Line elements and passive devices
Passive microwave circuits — Introduction

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Line elements and passive devices


Passive microwave circuits — Introduction

Authors : Paul-François COMBES, Raymond CRAMPAGNE

Publication date: February 10, 2002, Review date: September 25, 2020 | Lire en français

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1. Line elements and passive devices

  • The lines, which serve as junctions between these various circuits, and as substrates for some of them, are of various types:

    • metal waveguides, which offer excellent performance but have the disadvantage of a three-dimensional structure, making it difficult to manufacture circuit elements with complex mechanical structures (notably multipoles), and coaxial waveguides;

    • strip lines, slot lines and coplanar lines, whose performance is less good but which have the advantage of a two-dimensional structure (so-called planar lines), suitable for hybrid integration with active components and devices.

  • The passive elements of the circuits are :

    • dipoles that reflect energy (short...

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