부산대학교 도서관

In this paper, the antenna for parking management using wireless communication in outdoor parking environment was proposed. The proposed antenna was miniaturized by using parasitic element to reduce the size of the radiating element of the basic λ/2 microstrip antenna. The dimensions of the proposed antenna are 35 mm × 35 mm × 20.1 mm that is 98.7% smaller than 309.1 mm(0.46λ) × 296.1 mm(0.441λ) × 20.1 mm(0.029λ) of the basic λ/2 microstrip antenna. The electrical characteristics of the antenna are 1.1 dBi at the center frequency of 447 MHz, an omni-directional radiation pattern on the E-plane, and 87.5˚ of HPBW on the H-plane. The miniaturized λ/4 folded microstrip antenna using parasitic element has proved to be easy to mount on the wireless repeater, the sensor node installed on the ground, and the strop bar in the outdoor parking environment.