Summary
International Symposium on Antennas and Propagation
2012
Session Number:POS1
Session:
Number:POS1-43
Research of the Indoor Reflection Wave Control with Phase Control Wall
Ryokei Kitta, Yoshinobu Okano,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
In recent years, the uses of wireless communications technology are extending to everywhere and every scene. Almost all people are using radio frequency identification (RFID), digital terrestrial television broadcasting or wireless local-area networks (WLANs) everyday. As for television broadcasting, many countries are replacing to digital terrestrial television broadcasting. These digital television systems have the high ghost cancellation and the Doppler phase-shift compensation function. However, because the spectacle in the house deteriorates, it is disliked to install the high gain antenna for TV on the roof. And, the demand for the technology that receives TV broadcasting only with installing an indoor small antenna is increasing. In general, because electric field strength of the TV signal in the room is slight, the performance of high gain is expected of the indoor antenna. On the other hand, low antenna gain is supplemented if the reflection wave from the wall is concentrated on the indoor small antenna. It is actually impossible to transform the wall of an existing room into the parabolic surface. . In this paper, the effect when the reflector that can control the reflection wave phase is installed on the room wall is reported though it is a planar shape. Concretely, it is thought that the wall approximate to the parabolic surface if the phase of the reflection wave is delayed near the centre of the wall. Hence, the planar phase delay element loading to room wall is proposed in this paper. Moreover, diffusion is also possible if concentrating is possible. It is thought that the problems of an indoor microwave fading are also solvable by this technique. The following chapter explains these concepts in detail.