Ultra-Wideband Cylindrical Conformal Array Antenna Based on LPKDA

A new type of ultra-wideband cylindrical conformal array antenna is presented. Considering that the microstrip antenna has the advantages of small size and easy conformity with the surface of the carrier and the non-frequency-dependent characteristics of the log periodic antenna, the microstrip log periodic antenna is selected as the unit of the array antenna. Then the fractal Koch curve structure is adopted to improve the traditional antenna. Then an array of five log periodic Koch antennas conformal with a hollow cylindrical carrier is designed. Simulation results show that when five log periodic antenna elements work simultaneously, the frequency range of S11<; -10dB is 3.57GHz-12.95GHz. Its operating bandwidth is 9.38 GHz and relative bandwidth is up to 114%, meeting the requirements of the working bandwidth of UWB antenna. Through the reasonable space layout and parameter optimization, the design has achieved miniaturization, , ultra-wide band, high gain, simple structure and so on. It is suitable for communication, reconnaissance and electronic countermeasures.