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The slot antenna

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In this chapter, we will consider the single-slot antenna. We will first discuss an arbitrarily shaped aperture in an infinite conducting ground plane. Then we specialise to a rectangular resonant slot antenna and derive its radiation conductance. We continue with the special but important case of a longitudinal slot in the broad wall of a rectangular waveguide. The normalised modal functions for describing fields in waveguides are introduced. The equivalent slot conductance as seen from the feeding waveguide is then calculated. Mutual coupling to other slots and ground plane edge effects is also discussed.

Chapter Contents:

• 4.1 An aperture in an infinite ground plane
• 4.1.1 Problem formulation
• 4.1.2 Far field
• 4.1.3 General field expressions
• 4.2 The rectangular slot antenna
• 4.3 Waveguide modes
• 4.3.1 Definitions
• 4.3.1.1 Sign convention
• 4.3.1.2 Modal indices
• 4.3.1.4 Normalisation
• 4.3.2 The rectangular waveguide
• 4.3.2.1 Normalised mode expressions
• 4.3.3 The TE10 mode case
• 4.4 The longitudinal slot in a waveguide wall
• 4.4.1 Preliminaries
• 4.4.2 The longitudinal rectangular slot
• 4.4.3 Rectangular waveguide and TE10 mode scattering
• 4.4.4 The equivalent slot conductance
• 4.5 Mutual coupling
• 4.5.1 Introduction
• 4.5.2 Mutual coupling calculations
• 4.5.2.1 Introduction
• 4.5.2.2 Equivalent circuit approach
• 4.5.2.4 Mutual admittance between two slot apertures
• 4.5.2.5 Array coupling
• 4.5.2.6 Calculating the mutual coupling
• 4.5.2.7 Examples
• 4.5.3 Finite ground plane effects
• References

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