ANTENNA SYSTEM FOR ELECTRONIC APPARATUS, AND METHOD FOR STRENGTHENING ISOLATION

• Main Author: OKADA TAKAAKI
• Format: Patent
• Language: English; Japanese
• Published: 08.02.2016
• Subjects: ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; ELECTRICITY

PROBLEM TO BE SOLVED: To strengthen isolation between an antenna packaged in an electronic apparatus and an external peripheral device.SOLUTION: A receptacle 51 for connecting an USB memory key 50 and an antenna 21 for a wireless LAN are packaged in a tablet terminal 10. The USB memory key radiates electromagnetic waves during operation and incurs noise in the antenna. A noise mitigation device 100 is disposed in the vicinity of the USB memory key and includes a configuration as a parasitic monopole antenna. A high frequency current that is made flow to the noise mitigation device 100 by an electric field of the electromagnetic waves radiated by the USB memory key radiates electromagnetic waves. The electromagnetic waves radiated by the noise mitigation device 100 change directional characteristics of the USB memory key and reduces a noise level that enters the antenna. For the noise mitigation device 100, an element length, a distance from the USB memory key 50 and a polarization direction become main parameters.SELECTED DRAWING: Figure 1 【課題】電子機器が搭載するアンテナと外部周辺デバイスのアイソレーションを強化する。【解決手段】タブレット端末１０は、ＵＳＢメモリ・キー５０を接続するレセプタクル５１と無線ＬＡＮのアンテナ２１を搭載する。ＵＳＢメモリ・キーは、動作中に電磁波を放射してアンテナにノイズをもたらす。ノイズ緩和器１００は、ＵＳＢメモリ・キーの近辺に配置され無給電のモノポール・アンテナとしての構成を備える。ＵＳＢメモリ・キーが放射する電磁波の電界によってノイズ緩和器１００に流れた高周波電流が電磁波を放射する。ノイズ緩和器１００が放射する電磁波がＵＳＢメモリ・キーの指向特性を変えてアンテナに進入するノイズ・レベルを低減する。ノイズ緩和器１００は、素子長、ＵＳＢメモリ・キー５０からの距離および偏波方向が主要なパラメータになる。【選択図】図１