文件名称:
Small Antenna Design
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文件大小: 2mb
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上传时间: 2010-01-02
详细说明： Antenna performance is fundamentally a function of size measured in wavelengths at the operating frequency. “Electrically small” antennas are those that are small compared to the wavelength, not necessarily small compared to the people who use them. The wavelength at the middle of the AM broadcast band is 300 m, so a tower 30 m tall is called electrically small even though it’s 15 times the height of a tall man. Small in the antenna business can mean “electrically small,” “low profile,” or “physically small.” Historical applicat ions have included mine communications, broadcast transmission and reception, and mobile radio communication for both military and civilian uses. Present and future applications include the historical ones plus mobile telephones and handheld combinations of telephones and wireless data links for video and computer mobile networks, and wireless data networks that include both stationary and mobile elements. Versions of these networks are being designed and deployed in the obvious area of personal communications, and areas as diverse as medical monitoring and industrial production. The performance and efficiency (battery life, for example) of any of these systems depend in a very basic way on each device’s ability to get its signal out and capture the signals from the other elements in the network. The antenna is the component that does it. ...展开收缩
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