13 August 2002 Archimedean-spiral and log-spiral antenna comparison
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Abstract
For several years, ground-penetrating radar (GPR) has been used to search for buried landmines. Most of the evaluation effort on complete detection systems has focused on end-to-end performance metrics (e.g., Pd and Pfa). Here, we focus on the specific performance of one critical component of GPR systems-the antennas. This is the first in a series of papers that will compare the following parameters of many different antennas: (1) the most useful bandwidths, (2) the role of polarization and polarization diversity, (3) spurious coupling effects, and (4) phase-correction considerations. This paper compares four types of Planning Systems, Inc., antennas that were developed for current and past GPR systems. These are a 5.5-in. log-spiral antenna without balun or spiral-arm terminations; 5.75-in. log-spiral antenna with tapered balun and arm termination; 5.5-in. Archimedean-spiral antenna with tapered balun, but without arm terminations; and 5.75-in. Archimedean-spiral antenna with tapered balun and arm terminations. Three main tests were performed to compare the antennas: (1) S11, to show overall matching bandwidth and to reveal discontinuities in the balun-antenna-termination structure; (2) S21, to measure undesired direct-path coupling relative to intended target scattering; and (3) S21, to show direct coupling vs. antenna spacing.
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Peter R. Lacko, Peter R. Lacko, Charmaine Cisneros Franck, Charmaine Cisneros Franck, Matthew Johnson, Matthew Johnson, James M. Ralston, James M. Ralston, Marshall R. Bradley, Marshall R. Bradley, Robert McCummins, Robert McCummins, } "Archimedean-spiral and log-spiral antenna comparison", Proc. SPIE 4742, Detection and Remediation Technologies for Mines and Minelike Targets VII, (13 August 2002); doi: 10.1117/12.479093; https://doi.org/10.1117/12.479093
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