tailieunhanh - Thiết kế một anten tái cấu hình theo đồ thị bức xạ ứng dụng cho thu phí điện tử trong hệ thống giao thông thông minh

Bài viết Thiết kế một anten tái cấu hình theo đồ thị bức xạ ứng dụng cho thu phí điện tử trong hệ thống giao thông thông minh trình bày: Đề xuất cấu trúc anten tái cấu hình theo tần số dựa trên anten dipole ứng dụng cho thu phí điện tử trong hệ thống giao thông thông minh. Anten bao gồm 5 dipole đặt trên mặt điện môi được nối hoặc ngắt với nhau bằng các PIN diode, . | DESIGN OF A RADIATION PATTERN RECONFIGURABLE ANTENNA FOR ELECTRONIC TOLL COLLECTION IN INTELLIGENT TRANSPORT SYSTEM CHO T 1,2 Hoang Thi Phuong Thao , Vu Van Yem 1 4 2 2 Electric Power University, Hanoi University of Science and Technology 1. INTRODUCTION With the rapid development of wireless communication, pattern reconfigurable antenna has received a considerable amount of attention in recent years. Pattern reconfigurable antenna is known characteristic can adapt with changing system requirements or environmental conditions [1]. A pattern reconfigurable antenna can provide different radiation patterns, so it can replace a number of traditional single antennas in system [2]. Therefore, compared with traditional antennas, the advantages of reconfigurable antennas are multifunction, flexibility, and help to reduce cost and overall size of system [3]. Furthermore, because of adjustable radiation patterns, reconfigurable antenna can be directed toward the access point, so it can save power for transmission and reduce noise [4]. So far, there is a lot of researches on radiation pattern reconfigurable antennas with different techniques, in which PIN diode is used popularly. In [5], radiation pattern of a compact planar antenna can be switched from different directions using PIN diodes, whereas in [6], it can steered between bidirectional and unidirectional. In [7, 8], the proposed antennas can switch between omnidirectional pattern and directional pattern by controlling PIN diodes. Another radiation pattern reconfigurable antenna using PIN diode is proposed in [9] can select between two beam directions. However, the bandwidth of this antenna is narrow. A planar printed dipole antenna with reconfigurable pattern properties in [10] is able to archive two opposite directions by switching four PIN diodes. This antenna has high gain, but increase in the overall antenna dimensions. In this paper, we propose a radiation pattern reconfigurable antenna based on printed