| Presentation | 2008/9/4 Broadband directional borehole radar design with a selective frequency dipole antenna array Takuya TAKAYAMA, Motoyuki SATO, |
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| PDF Download Page | PDF download Page Link |
| 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) |
| Place (in English) | |
| 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 | |