Near field analysis of a wideband log-spiral antenna for 1-2 GHz GPR

Author

Phelan, Mike ; Su, Hong ; LoVetri, Joe

Author_Institution

Dept. of Electr. & Comput. Eng., Manitoba Univ., Winnipeg, Man., Canada

Volume

1

fYear

2002

fDate

6/24/1905 12:00:00 AM

Firstpage

336

Abstract

A log-spiral antenna is described. It is part of the ultra-wideband stepped frequency ground penetrating radar (GPR) for subsurface landmine detection currently being developed at the University of Manitoba. Log-spiral antennas possess many features that are desirable in such a radar system: low profile, high bandwidth, and circular polarization. The design and construction of the antenna are described. The antenna is fitted with a wideband balun to balance the current between the two arms of the spiral. An absorber loaded cavity is used behind the antenna to help direct the energy into the ground and keep it from radiating into the air. A study of the far and near fields of the antenna, via simulations and measurements, is presented. The near fields are measured using short coaxial E-field probes at an electrically short distances from the antenna and agree well with simulations.

Keywords

UHF antennas; antenna feeds; antenna radiation patterns; baluns; buried object detection; electromagnetic wave polarisation; radar antennas; spiral antennas; 1 to 2 GHz; E-field probes; GPR; absorber loaded cavity; circular polarization; ground penetrating radar; log-spiral antenna; planar antenna; stepped frequency radar; subsurface landmine detection; wideband antenna; wideband balun; Antenna measurements; Bandwidth; Broadband antennas; Frequency; Ground penetrating radar; Impedance matching; Landmine detection; Polarization; Radar antennas; Ultra wideband technology;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on

ISSN

0840-7789

Print_ISBN

0-7803-7514-9

Type

conf

DOI

10.1109/CCECE.2002.1015245

Filename

1015245