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Characterization, Design and Optimization of Low-Profile Cavities for UWB Spiral Antennas

  • Rahman N
  • Sharma A
  • N. Afsar M
International Journal of Electromagnetics and Applications (2012) 2(3) 16-23
DOI: 10.5923/j.ijea.20120203.01
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Abstract

In this paper, we present a methodology for developing very low profile, hybrid, cavity-backed UWB spiral antennas from a precision electromagnetic material characterization standpoint. Using our method, we have accurately characterized, designed and optimized the dimensions of a 2-18GHz, cavity-backed Archimedean spiral antenna. The simulation and measurement results show that the antenna demonstrates excellent axial ratio and gain-bandwidth performance while maintaining an absorptive cavity depth of only 0.625 inches. The procedure can be extended to the design and optimization of any low-profile spiral radiator required to operate over extremely broad frequencies.

Figures

  • Figure 1. 2-arm, Archimedean spiral antenna with a shallow cavity
  • Figure 4. Measured constitutive parameters for the third metal-backed layer (WT-BPJA-010)
  • Figure 2. Measured constitutive parameters for the first layer (AN-74)
  • Figure 5. Reflection coefficient of BPJA010 as a function of frequency. It is a narrowband absorber and exhibits strong absorption at 5GHz at 0.18” thickness
  • Table 1. Comparison of gain and axial ratio (dB) performance of optimized antennas with purely dielectric absorbers and hybrid absorbing materials in cavity
  • Figure 6. Measured vs. simulated gain (dBi) for principal planes at 2GHz
  • Figure 10. Measured vs. simulated gain (dBi) for principal planes at 18 GHz
  • Figure 12. Return loss S11 (dB) vs. frequency (GHz)

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APA

Rahman, N., Sharma, A., & N. Afsar, M. (2012). Characterization, Design and Optimization of Low-Profile Cavities for UWB Spiral Antennas. International Journal of Electromagnetics and Applications, 2(3), 16–23. https://doi.org/10.5923/j.ijea.20120203.01

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