Wireless communication has made dramatic development by communication skill which is transmitted voice and data with advantage of a convenient and movement. The wireless communication is constantly developing in a variety of fields in offering a new service.
This thesis presents internal antenna and/or RFID tag antenna miniaturization and broadband skill for mobile communication. First, it describes about a personal digital assistant antenna's miniaturization and broadband skill, after improving isolation. Second, it appeared the feature about the RFID tag antenna's miniaturization, broadband skill and application. To apply for the vehicles that going in and out system and traffic, tag antenna's position takes advantage of the side-view mirror because most of reader is located on side of a car. Directivity that radiation patterns of tag antenna which is attached on inside of the side-view mirror shows influence of car body(conductor). Readable ranges have been evaluated as reader had received the information from the tag.
This thesis is shown very high isolation and resonable antenna characteristics such as radiation pattern, antenna gain, broadband, antenna size, etc.. Due to these merits of the proposed design techniques, it is expected the proposed design techniques could be applied in the wireless communication and RFID system.