Presentation | 2008/9/4 Broadband directional borehole radar design with a selective frequency dipole antenna array Takuya TAKAYAMA, Motoyuki SATO, |
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Abstract(in Japanese) | (See Japanese page) |
Abstract(in English) | We developed an array-type directional borehole radar system with a circular receiving antenna array. An azimuth incident angle of an electro-magnetic wave can be estimated by the receiving array which consists of four dipole antenna elements. Due to the limitation of a diameter of a borehole, in which the radar system is inserted, separation among antenna elements is very small, even as small as few hundredth of a wavelength. Past studies have revealed a presence of mutual coupling among antenna elements, which adversely reduce the coherence of received signals at a dipole resonant frequency. In this paper we propose a use of a selective frequency dipole antenna with a PIN diode attached on its dipole arm. Unmatched resonant frequency of dipole antenna elements raises the frequency of the mutual coupling outbreak by 50MHz, resulting wider bandwidth useful for a direction of arrival estimation. |
Keyword(in Japanese) | (See Japanese page) |
Keyword(in English) | GPR / Directional borehole radar / Mutual coupling / Direction of arrival estimation / Frequency selective dipole antenna |
Paper # | A・P2008-81 |
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Conference Information | |
Committee | AP |
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Conference Date | 2008/9/4(1days) |
Place (in Japanese) | (See Japanese page) |
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Topics (in Japanese) | (See Japanese page) |
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Paper Information | |
Registration To | Antennas and Propagation (A・P) |
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Language | JPN |
Title (in Japanese) | (See Japanese page) |
Sub Title (in Japanese) | (See Japanese page) |
Title (in English) | Broadband directional borehole radar design with a selective frequency dipole antenna array |
Sub Title (in English) | |
Keyword(1) | GPR |
Keyword(2) | Directional borehole radar |
Keyword(3) | Mutual coupling |
Keyword(4) | Direction of arrival estimation |
Keyword(5) | Frequency selective dipole antenna |
1st Author's Name | Takuya TAKAYAMA |
1st Author's Affiliation | Graduate School of Environmental Studies, Tohoku University() |
2nd Author's Name | Motoyuki SATO |
2nd Author's Affiliation | Center for Northeastern Asian Studies, Tohoku University |
Date | 2008/9/4 |
Paper # | A・P2008-81 |
Volume (vol) | vol.108 |
Number (no) | 201 |
Page | pp.pp.- |
#Pages | 5 |
Date of Issue |