Dielectric Characterization and Optimization of Wide-band, Cavity-Backed Spiral Antennas

Authors

  • Nahid Rahman High Frequency Materials Measurement and Information Center Tufts University, 161 College Avenue, Medford, Massachusetts 02155, USA
  • Anjali Sharma High Frequency Materials Measurement and Information Center Tufts University, 161 College Avenue, Medford, Massachusetts 02155, USA
  • Mohammed Afsar High Frequency Materials Measurement and Information Center Tufts University, 161 College Avenue, Medford, Massachusetts 02155, USA
  • Sandeep Palreddy Microwave Engineering Corporation, 1551 Osgood Street, North Andover, Massachusetts 01845, USA
  • Rudolf Cheung Microwave Engineering Corporation, 1551 Osgood Street, North Andover, Massachusetts 01845, USA

Keywords:

Dielectric Characterization and Optimization of Wide-band, Cavity-Backed Spiral Antennas

Abstract

This paper presents a novel approach to facilitate the design of wideband, cavity-backed spiral antennas. Using this approach, first, a 2-18 GHz, two-arm cavity backed Archimedean spiral antenna has been designed in FEKO. A multilayer dielectric absorber has been introduced in the cavity to facilitate unidirectional operation of the antenna. In order to incorporate the frequencydependent complex permittivity data of the absorbing materials inserted in the cavity, precise microwave instrumentation has been used to determine these parameters experimentally. Based on this data, a genetic algorithm optimization procedure has been applied to derive the most favorable geometry of the absorbing cavity. Our results show that a design thus optimized significantly improves key performance parameters, maximizes the co-polarized gain, and minimizes the cross-polarized gain of the antenna across its operational bandwidth. We have then extended the approach to the design of a zigzagged 2-arm Archimedean spiral antenna and also a 1.5:1 ratio elliptical spiral antenna and presented the radiation characteristics here.

Downloads

Download data is not yet available.

References

S. E. Lipsky, Microwave Passive Direction

Finding, SciTech Publishing, January, pp 39-

, 2004.

T. Milligan, Modern Antenna Design, Wiley-

IEEE Press, pp. 372-373, 1985.

J. L. Volakis, M. W. Nurnberger, and D. S.

Filipovic, “A Broadband Cavity-Backed Slot

Spiral Antenna,” IEEE Antennas and

Propagation Magazine, vol. 43, no. 6,

December 2001.

Eugene F. Knott, John F. Shaeffer, and

Michael T. Tuley, Radar Cross Section,

SciTech Publishing, pp. 248-266, 2004.

FEKO Software, EM Software and Systems,

South Africa, 2008.

J. Baker-Jarvis, E. J. Venzura, and W. A.

Kissick, “Improved Technique for

Determining Complex Permittivity with the

Transmission/Reflection Method,” IEEE

Trans. Microwave Theory Tech., vol. 38, no.

, pp. 1096-1103, August 1990.

MATLAB, (2007a), The MathWorks, Inc.

N. Al-Moayed, M. N. Afsar, U. A. Khan, S.

McCooey, and M. Obol, “Nano Ferrites

Microwave Complex Permeability and

Permittivity Measurements by T/R Technique

in Waveguide,” IEEE Transactions on

Magnetics, vol. 44, no. 7, July 2008.

M. N. Afsar, Y. Wang, and R. Cheung,

“Analysis and Measurement of a Broadband

Spiral Antenna,” IEEE Antennas and

Propagation Magazine, vol. 46, no. 1,

February 2004.

Downloads

Published

2022-05-02

How to Cite

[1]
N. . Rahman, A. . Sharma, M. . Afsar, S. . Palreddy, and R. . Cheung, “Dielectric Characterization and Optimization of Wide-band, Cavity-Backed Spiral Antennas”, ACES Journal, vol. 26, no. 2, pp. 123–129, May 2022.

Issue

2011: Vol 26 Iss 2

Section

General Submission