### Selection of antennas for anti-DRONE systems: Technical points and application strategiesWith the rapid popularization of UAV technology, the demand for anti-UAV systems is increasing day by day, and the antenna is the core component of the system, and its choice directly determines the detection, tracking and interference capabilities of the system.Combining technical principles and application scenarios, this paper systematically analyzes the selection strategy of the antenna in the anti-UAV system.--- ####1. Antenna type and characteristicsIn an anti-drone system, the choice of antenna needs to be considered in accordance with functional requirements (such as detection, interference, positioning) and environmental conditions.The main types include：1. **Omnidirectional antenna**     The omnidirectional antenna is characterized by 360° coverage and is suitable for full airspace protection in open areas.For example, in military bases or large-scale event sites, omnidirectional antennas can be installed on commanding heights to achieve comprehensive monitoring of the surrounding airspace.Its advantage is that there is no need to adjust in a specific direction, but the gain is low, which is suitable for a wide range of signal coverage scenarios.2. **Directional antenna**     Directional antennas enhance energy in a specific direction by focusing signals. Common types include Yagi antennas, logarithmic periodic antennas, and plate antennas.It is characterized by high gain and long-distance transmission, which is suitable for precision strikes or mobile equipment.For example, portable anti-drone guns usually use directional antennas, which can interfere with drone navigation signals in a directional manner within 1.5 kilometers.3. **Multi-band composite antenna**     Modern drones use a variety of frequency bands (such as 2.4GHz, 5.8GHz, GNSS frequency bands, etc.), so multi-band antenna support is required.For example, the anti-drone antenna structure developed by Shanghai Kongzhi Company integrates multi-band radiation units such as 868MHz/915MHz, 1.5GHz, 2.4GHz and 5.8GHz to achieve broadband coverage through power distribution networks and improve the compatibility of different drones.--- ####2. Core considerations for antenna selection1. **Frequency band coverage capability**     Uav communication and navigation involve multiple frequency bands, including ISM frequency bands (such as 2.4GHz, 5.8GHz), GNSS frequency bands (1165~1625MHz), etc.).The antenna needs to support signal transmission and reception in the target frequency band.For example, the interception frequency band of a certain type of anti-drone equipment covers GNSS, ISM800M and 5.8GHz, and its antenna design needs to take into account multi-band coupling and isolation.2. **Gain and directivity**     -**High-gain directional antenna**: Suitable for long-range precision strikes, such as laser or microwave weapon systems, which need to concentrate energy through narrow beams.   -**Medium and low gain omnidirectional antenna**: Used for wide-area detection, such as radio frequency scanners or acoustic sensors, it is necessary to balance coverage and sensitivity.3. **Environmental adaptability**     -**Portability**: Mobile devices (such as handheld jammers) require a lightweight antenna design, usually weighing less than 5kg, and support rapid deployment.   -**Anti-interference ability**: In a complex electromagnetic environment, the antenna needs to have anti-multipath interference and noise suppression capabilities, such as the use of polarization diversity technology.4. **Power and efficiency**     Antenna power directly affects interference or detection distance.For example, a certain type of directional energy weapon needs to be equipped with a microwave antenna with a transmission power of 450W to achieve an effective strike of more than 1.5 kilometers.--- ####3. Application scenarios and typical cases1. **Protection of fixed facilities**     **Recommended configuration**: omnidirectional antenna + multi-band composite antenna     Fixed targets such as oil depots, command centers, etc. need to be monitored in the entire airspace around the clock.Using an omnidirectional antenna combined with a multi-band radiation unit (such as a 2.4GHz antenna with a four-corner layout and a centered 5.8GHz antenna), wide-area detection and precise frequency band suppression can be achieved at the same time.2. **Mobile reaction equipment**     **Recommended configuration**: Directional Yagi antenna or plate antenna     Portable jammers or on-board systems usually choose directional antennas. For example, logarithmic periodic antennas can block DRONE GPS signals within 1.5 kilometers, and they are compact and easy to carry.3. **Complex electromagnetic environment**     **Recommended configuration**: Smart switching antenna     In urban environments where multi-signal interference exists, smart antennas that can dynamically switch directions and frequency bands, combined with software-defined radio (SDR) technology, can adaptively adjust interference strategies.--- ####4. Future development trends1. **Intelligence and adaptability**     Combined with AI algorithms, the antenna can analyze the signal characteristics of the UAV in real time and dynamically adjust the beam to improve the interception efficiency.2. **Multi-modal fusion design**     The radar, optoelectronics and radio frequency antennas are integrated on the same platform, and the target recognition accuracy is improved through the fusion of multi-sensor data.3. **Metamaterials and miniaturization**     The use of metamaterial technology to develop low-profile, high-gain antennas to further reduce the size of the equipment and adapt to the needs of individual combat.--- ### SummaryThe antenna selection of anti-drone systems needs to comprehensively consider frequency band compatibility, environmental adaptability, power efficiency and scenario requirements.Directional antennas are suitable for precision strikes, omnidirectional antennas are suitable for wide-area monitoring, and multi-band composite antennas are the key to dealing with complex threats.With technological progress, antennas will develop in the direction of intelligence and integration in the future, providing stronger technical support for anti-drone systems.