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Inverted suspended space fed microstrip antenna for wireless applications

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  1. Introduction
  2. Analysis model
  3. Analysis and results on infinite ground plane
  4. Analysis and results on finite ground plane and finite substrate
  5. Conclusion
  6. References

The basic microstrip antenna (MSA) is a resonant patch of metal, etched on the surface of grounded dielectric slab. The dielectric material is replaced with air to improve the bandwidth and to minimize losses. The proposed space fed microstrip antenna (MSA) consists of fed patch and parasitic patch separated by 0.5 ?0 to enhance the gain. The parasitic patch is printed on bottom side (inverted suspended configuration) of low cost FR4 substrate with dielectric constant 4.4 and loss tangent 0.02 respectively. The antenna is excited with coaxial probe feed using N type connector from the fed patch. The radiation from fed patch is intercepted electromagnetically by parasitic patch and it reconfigures the radiation and reradiates. The cavity formed between fed and parasitic patch maximizes field and enhances gain. This depends upon the spacing between fed and parasitic patch. Key Words: Microstrip antenna; patch antenna; stacked antenna; ISM band

[...] Height mm 0.45 ? ? ?0 D G ? SLL - 10.4 - 11.9 - 8.55 CP - 13.5 - 19.2 Table 2 Performance parameters for variation in Parasite patch heights Table 1 Performance parameters for variation in fed patch heights Fig Effect of Variation in Parasite Patch Length: The length of parasitic patch is decremented to 43 mm, the input impedance curve shits from its reference position slightly. The same thing happens when the parasitic patch length is incremented by 45 mm. [...]


[...] Figure 3.1 shows variation in impedance curve for these variations in heights of fed patch and table 1 gives antenna performance parameters for these variations. Height mm D G ? SLL - 11.8 - 11.8 - 11.4 CP - 21.2 - 18.8 - Effect of Variation in Parasite Patch Height: The parasitic patch is placed at 0.5 ?0 over the fed patch. According to the cavity formed between fed patch and parasitic patch maximizes field with interaction and thereby enhances the gain. [...]


[...] In this paper, a two element stacked space fed microstrip antenna which is composed of fed element and one parasite element is proposed. It covers considerable bandwidth with high gain. The antenna is analyzed with full wave based method of moments to investigate characteristics and behavior under different parametric variations. Although the microstrip antenna has practical advantages such as low profile and light weight, a single patch antenna has low gain dBi) and narrow bandwidth There has been considerable interest in the two layer electromagnetically coupled patch antennas consisting of driven patch in the bottom and a parasite patch on the top When the dielectric material is replaced with air the antenna provides enhancement in bandwidth compared to about for a single patch. [...]

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