Design and Fabrication of Reconnaissance UAV Using Wireless Transmission Modulus and Conformal Antenna Propagation

• Main Authors: Chong-Ming Jiang, 江崇銘
• Other Authors: Kuo-Chung Liu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/a54vnh

碩士 === 國防大學理工學院 === 航空太空工程碩士班 === 102 === In this thesis, a typical airplane design method could be used for the configuration design of mini UAV (unmanned aerial vehicles) having a take-off weight magnitude of 20-50 pounds. We have attempted to design a mini UAV with canard to demand the requirement of higher payload by utilizing airplane design methodology, and set up the standard design procedure of a mini UAV to meet other requirements in future. To integrate wireless module and the conformal antenna into an innovative module is the purpose of this thesis. The proposed conformal antenna has a simple configuration and design rules. With the T-shaped asymmetric feedline, the first circularly polarized (CP) operating band can be obtained. By subsequently embedding a corner strip, the second CP operating band can be achieved. Finally, the deteriorated axial ratio in the middle frequency band can be improved by a square notch at the edge of the ground plane. These three bands can be combined to form a broad CP band with a 3-dB-axial-ratio bandwidth of about 64 %. The design rules of the proposed antenna can be further applied to another designs operated at different frequency band. Moreover, for improving the antenna gain and obtained a low profile antenna, an open back cavity with designed notches and roof patches on the metal sidewalls is set behind the bidirectional CP slot antennas. It can not only reduce the backward radiation but also increase the averaged antenna gain of more than 3 dB. Finally, the practical flight test with the reconnaissance mission is performed by the reconnaissance UAV, called prototype 2013, equipped with the wireless transceiver module integrated with the developed conformal antenna. It is confirmed that the reconnaissance image and the signal quality obtained by the proposed antenna are better than that obtained by the traditional standard antenna.