An Improvement of Communication Environment for ETC System by Using Transparent EM Wave Absorber(Electromagnetic Theory)
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概要
- 論文の詳細を見る
When a large-size car exists on the ETC lane (Electronic Toll Collection System), there is the possibility that the interference on the adjacent lane occurs by the scattering waves from one. In this paper, we propose a new improvement method which the transparent EM wave absorber is placed between the ETC lane and the adjacent one in order to suppress the scattering waves from a large-size car. Therefore, we design the transparent EM wave absorber which consists of the transparent resistive and conductive films. Then, this absorber is produced, and its reflection and transmission coefficients are evaluated. In addition, its transmittance in optics is evaluated. As the results, the reflectivity of this absorber is obtained lower than -20 dB in the oblique incident angle from 0° to 30° at 5.8 GHz circular polarized wave, abbreviated as CP wave, and also the transmittivity is obtain lower than -27 dB in the oblique incident angle from 0° to 70°, respectively. On the other hand, the transmittance in optics is obtained higher than 60%. Moreover, we study experimentally on the ETC system with placing this absorber between the ETC lane and the adjacent one. We measured the distribution of receiving power on the adjacent lane, when a water sprinkler existed on the ETC lane. As a result, it is confirmed that the receiving power on the adjacent lane could be realized lower than -70.5 dBm, and then a new improvement method has proven to be very useful in the ETC system.
- 社団法人電子情報通信学会の論文
- 2005-12-01
著者
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Iwata Takeo
Highway Industry Development Organization
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KURIHARA Hiroshi
EMC Engineering Div., TDK Corporation
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HIRAI Yoshihito
EMC Engineering Div., TDK Corporation
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TAKIZAWA Koji
EMC Engineering Div., TDK Corporation
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HASHIMOTO Osamu
Aoyama Gakuin University
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Hashimoto Osamu
Aoyama Gakuin Univ. Sagamihara‐shi Jpn
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Kurihara Hiroshi
Tdk Corporation
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Takizawa Koji
Tdk Corporation Emc Engineering Div.
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Hashimoto Osamu
College Of Science And Engineering Aoyama Gakuin University
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Hirai Yoshihito
Emc Engineering Div. Tdk Corporation
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