Dielectric Characterization and Optimization of Wide-band, Cavity-Backed Spiral Antennas
Nahid Rahman (1), Anjali Sharma (1), Mohammed Afsar (1), Sandeep Palreddy (2), Rudolf Cheung (2)
(1) High Frequency Materials Measurement and Information Center, Tufts University, Medford, Massachusetts (2) Microwave Engineering Corporation, North Andover, Massachusetts
This paper presents a novel approach to facilitate the design of wideband, cavity-backed spiral antennas. Using this approach, 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 frequency-dependent 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.
26th Annual Review of Progress in Applied Computational Electromagnetics
2010
April
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