Concepts and models for advanced designs

Concepts and models for advanced designs

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In this chapter we will discuss a number of concepts and models used in advanced design and optimisation of slot arrays. Models for coupling slots will be presented followed by a discussion of the edge wall slot and the compound radiating slot. Iris-excited longitudinal slot arrays, slot arrays in ridge waveguides and slot arrays covered by a dielectric layer will also be discussed. Higher-order mode coupling between adjacent coupling slots and that between a coupling slot and radiating slots in its immediate vicinity will be presented. A method of incorporating the finite ground plane effects in the design and analysis will be described. The MoM solution to the coupled integral equations for the apertures of all slots in a planar array will be discussed. Some examples employing the moment method solutions of slot arrays for improved designs will be presented.

Chapter Contents:

  • 8.1 Coupling slot models
  • 8.1.1 Centred-inclined coupling slot
  • 8.1.2 Shunt-series coupling slot
  • 8.1.3 Transverse/transverse coupling slot
  • 8.2 Edge wall slot
  • 8.3 Radiating compound broad wall slot
  • 8.4 Iris-excited longitudinal slot
  • 8.4.1 Elliott's design procedure for iris-excited slotted waveguide arrays
  • 8.5 Slot arrays in ridge waveguides
  • 8.6 Slot arrays with a dielectric cover
  • 8.7 Higher-order mode coupling between centred-inclined coupling slots
  • 8.7.1 Theory for the higher-order mode coupling between centred-inclined coupling slots
  • 8.7.2 Procedure to incorporate the higher-order mode coupling in the design of centred-inclined coupling slots
  • 8.8 Higher-order mode coupling between a centred-inclined coupling slot and longitudinal radiating slots
  • 8.9 Finite ground plane effects
  • 8.10 MoM solution to the integral equations of a planar array and applications
  • 8.10.1 Formulation of the coupled integral equations
  • 8.10.2 MoM solution
  • 8.10.3 Improved design procedure using the MoM solution
  • 8.11 Global optimisations for improved designs
  • 8.11.1 GA optimisation of a travelling wave linear array
  • 8.11.2 GA optimisation of a planar standing wave array using the MoM analysis
  • 8.11.3 Equivalence between a slot with one basis function and a slot with many basis functions
  • 8.11.4 GA optimised results
  • References

Inspec keywords: slot antenna arrays; optimisation; dielectric waveguides; ridge waveguides; integral equations; method of moments

Other keywords: higher-order mode coupling; coupled integral equations; slot array optimization; iris-excited longitudinal slot arrays; finite ground plane effects; radiating slots; ridge waveguides; advanced designs; edge wall slot; planar array; MoM solution; compound radiating slot; dielectric layer; adjacent coupling slots

Subjects: Waveguides and microwave transmission lines; Optimisation techniques; Integral equations (numerical analysis); Antenna arrays

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