Summary
International Symposium on Antennas and Propagation
2008
Session Number:2D04
Session:
Number:2D04-1
Verification of Compensation Effect of Quasi-Inverse Filter in Wideband Communication System
Mitoshi FUJIMOTO, Toshikazu HORI,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
In recent years, the demands on a large capacity, high-reliability and high quality are remarkable in the wireless communication system. UWB (Ultra Wide Band) wireless communications can transmit at a speed of several gigabits per second [1]. A wideband antenna is required for the system because a very wide frequency band is utilized in UWB. However, it is difficult to obtain an antenna that has uniform characteristics in all UWB frequency bands. Pre-distortion technology to compensate for the distortion due to the antenna characteristics before transmission was proposed in [2]. To compensate for the distortion in the gain characteristics of the antenna, a method of inverse filtering was proposed [3] [4]. However, the compensation effect of the inverse filter was not sufficient when the distortion of the antenna gain characteristics was severe. The authors have proposed a quasi-inverse filter (QIF) in order to improve the compensation effect and an effectiveness of the proposed filter has been indicated through computer simulation [5]. In the simulation, a simple model for antenna characteristics was employed, however, real antenna characteristics are very complex in general. In this paper, the QIF is applied to two antennas as a concrete example of a broadband antenna; one is a disc monopole antenna, and the other is a square loop antenna.