Compensation for Frequency Characteristics Distortion of Antenna Using Pre-distortion Filter

High speed wireless communication system attracts much attention in recent years. To realize the high speed wireless communication system utilizing ultrawide-frequency bands, a broadband antenna must be required. However, it is difficult to obtain the antenna which has uniform characteristics in broad frequency band. Thus, the communication quality tends to become worse because of distortion of the gain characteristics and the group delay characteristics of the antenna. To compensate the gain characteristics of the antenna, a pre-distortion technology has been proposed by the authors [1]. This paper proposes the compensation method for frequency characteristics distortion of antenna using predistortion filter, under considering both gain and group delay characteristics of antenna. And the effectiveness of the method is verified by the simulation results.