Developing a High-Power Metal-Plate Lens Antenna for Microwave Fracturing of Rocks

IF 1.2 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Microwave and Optical Technology Letters Pub Date : 2025-03-12 DOI:10.1002/mop.70169

Yanlong Zheng, Zhongjun Ma, Jianchun Li

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Abstract

This study presents the design and experimental validation of a high-power metal-plate lens antenna for efficient microwave fracturing of rocks in the near-field. The antenna integrates a horn feed with a biconcave metal-plate lens to achieve extended working distances and enhanced power focusing. Through numerical simulations, the antenna demonstrated a maximum microwave power density of 22 W/cm² on diabase rock surfaces at 6 kW input power with a 36 cm irradiation distance. The reflection coefficient remained below −10 dB across irradiation distances of 20–50 cm, confirming robust energy transmission. Rock fracturing tests revealed that the antenna effectively induced thermal cracking at 36 cm, achieving a peak surface temperature of 270°C after 4 min of irradiation. The results highlight the antenna's ability to maintain focused microwave energy over practical working distances, offering significant potential for deployment in tunneling and mechanical excavation where conventional antennas face limitations. This work advances high-power microwave applications in geotechnical engineering by addressing critical challenges in power delivery and operational range.

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用于岩石微波压裂的高功率金属板透镜天线的研制

本文介绍了一种用于近场岩石高效微波压裂的高功率金属板透镜天线的设计和实验验证。天线集成了一个喇叭馈电和一个双凹金属板透镜，以实现扩展的工作距离和增强的功率聚焦。通过数值模拟，该天线在辉绿岩表面上的最大微波功率密度为22 W/cm²，输入功率为6 kW，照射距离为36 cm。在20-50 cm的辐照距离内，反射系数保持在−10 dB以下，证实了强大的能量传输。岩石破裂试验表明，天线在36 cm处有效诱导热裂，辐照4 min后表面温度峰值达到270℃。结果强调了天线在实际工作距离内保持聚焦微波能量的能力，为传统天线面临限制的隧道和机械挖掘提供了巨大的潜力。这项工作通过解决功率传输和操作范围的关键挑战，推进了高功率微波在岩土工程中的应用。

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来源期刊

Microwave and Optical Technology Letters 工程技术-工程：电子与电气

CiteScore

3.40

自引率

20.00%

发文量

371

审稿时长

4.3 months

期刊介绍： Microwave and Optical Technology Letters provides quick publication (3 to 6 month turnaround) of the most recent findings and achievements in high frequency technology, from RF to optical spectrum. The journal publishes original short papers and letters on theoretical, applied, and system results in the following areas. - RF, Microwave, and Millimeter Waves - Antennas and Propagation - Submillimeter-Wave and Infrared Technology - Optical Engineering All papers are subject to peer review before publication