Directional antenna for underwater ground penetrating radar
A directional antenna, ground penetrating radar technology, applied in the direction of antenna, underwater/underground adaptation, antenna grounding switch structure connection, etc., can solve the problems of weakening radar detection ability, unfavorable underwater measurement, large antenna size, etc., and achieve the convenience of radar underwater The effect of lower measurement, small size and compact structure
Active Publication Date: 2021-11-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
Doing so would cause a large portion of the energy to be reflected back at the air-water interface, thereby reducing the radar's ability to detect it
In addition, there are also radar antennas that are placed directly into the water, but since the working frequency of ground penetrating radar is mostly in the 10-500MHz frequency band, the size of the antenna is relatively large, and the resistance caused by placing it underwater is too large, which is not conducive to underwater measurement
Method used
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0036] join Figure 1 to Figure 7 The directional antenna for underwater ground-penetrating radar provided by the embodiment of the present invention includes: support rod 1, antenna sheet 2, sealing plate 3, reflection cavity 4, balun 5, filling liquid 6, watertight SMA joint 8 (watertight radio frequency Electrical connectors, also known as pressure-bearing SMA connectors). Wherein, antenna piece 2 is made of circular substrate, and the dipole 2-1 of fan-shaped structure is coated on the front and back of circular substrate, and its material is metal material, and the feed of the dipole 2-1 of fan-shaped structure The position is located at the center of the circular substrate, that is, the antenna sheet feeding via hole 2-3 is set ...
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Abstract
The invention discloses a directional antenna for an underwater ground penetrating radar, and belongs to the technical field of ground penetrating radars. The directional antenna comprises an antenna sheet and a reflection cavity. The antenna sheet is composed of a circular substrate; the front face and the back face of the substrate are coated with fan-shaped dipoles made of a metal material; the feed positions of the dipoles are located at the circle center of the circular substrate; and metal via holes are formed in the feed positions to achieve electric connection of the fan-shaped dipoles on the front face and the back face. Thus, the antenna sheet has broadband performance. The reflection cavity is a cylindrical metal cavity, with the upper end open and the bottom closed. The antenna sheet is fixed on the reflection cavity through a supporting fixing rod. A watertight connector is fixed at the bottom of the reflection cavity and electrically connected with the antenna sheet through a balun. The balun is fixed at the bottom of the reflection cavity so as to ensure the stability of the structure. A sealing plate is installed in the reflection cavity, and filling liquid is injected into the cavity to consume part of electromagnetic wave energy radiated by the antenna sheet towards the interior of the reflection cavity, so that the time domain performance of the antenna is improved.
Description
technical field [0001] The invention relates to the technical field of ground-penetrating radar, in particular to a directional antenna for underwater bottom-penetrating radar. Background technique [0002] In a series of infrastructure constructions such as dams and bridges, early detection and later monitoring are crucial. In addition, the excavation or mapping of some underwater ruins is also inseparable from relevant measurements. As a fast and non-destructive measurement method, ground penetrating radar has been reported to be used in underwater detection, such as underwater archaeology and underwater geological exploration. A common practice is to use common commercial radars for measurements, placing the radar on the surface of the water and looking down, for example, above a ship on the water and looking down. Doing so causes much of the energy to be reflected back at the air-water interface, reducing the radar's ability to detect it. In addition, there are also r...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01Q1/36H01Q1/50H01Q15/14H01Q1/42H01Q1/04
CPCH01Q1/36H01Q1/50H01Q15/14H01Q1/42H01Q1/04Y02A90/30
Inventor 赵青童继生郭成赵怿哲李佳黛刘耀耀
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA