A Printed Log-periodic Dipole Array Antenna with Band Notched Characteristics

A printed log-periodic dipole array(LPDA) antenna with band notched characteristics is proposed in this paper. The antenna is made of multilayer printed circuit. The working frequency of the antenna in this paper is 2.5-6.2GHz, and the notch frequency is 3.5GHz. In this paper, resonant parallel striplines(RPS) are used in the notch method of printed LPDA antenna. It can directly cover the transmission line of the antenna. The electric field distribution of LPDA antenna with notch structure and without notch structure is simulated, and the radiation characteristics and notch characteristics of the LPDA antenna are analyzed. The designed antenna has almost no radiation in the notch band, and its working state is basically the same as that of the non-notch antenna in other frequencies.