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Appendix A - Microstrip antenna substrates

Appendix A - Microstrip antenna substrates

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The selection of a substrate material is a balance between the required electrical, mechanical, and environmental performance required by a design versus economic constraints. Generally, if one has the available design volume to use air as a substrate for a microstrip antenna, this is a good choice. The antenna efficiency is high and the gain is maximized as is the impedance bandwidth of a conventional microstrip antenna. The surface wave loss when air is used as a substrate is minimal. When a dielectric substrate is selected, one is often interested in a material with the lowest loss tangent available. This Appendix discusses: microstrip antenna and transmission line substrates, metal cladding, dielectric materials, radome materials, water absorption, dielectric films, passive intermodulation, solder masks, and conformal coatings.

Chapter Contents:

  • A.1 Microstrip antenna/transmission line substrates
  • A.2 Metal cladding
  • A.3 Dielectric materials
  • A.3.1 Plastics
  • A.3.2 Ceramics
  • A.3.3 Glass transition temperature (Tg)
  • A.3.4 Composite dielectric substrates
  • A.3.5 FR-4
  • A.3.6 Fiberglass
  • A.3.7 Dielectric foam
  • A.4 Radome materials
  • A.5 Water absorption
  • A.6 Dielectric films
  • A.7 Passive intermodulation
  • A.8 Solder mask and conformal coatings
  • References

Inspec keywords: microstrip antennas; dielectric materials; substrates

Other keywords: solder masks; dielectric films; passive intermodulation; substrate material; metal cladding; microstrip antenna substrates; water absorption; conformal coatings; transmission line substrates; dielectric materials; radome materials

Subjects: Single antennas; Dielectric materials and properties

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