a first conductive antenna surface; a first filter having a first interface coupled to both the first feed point and the first conductive antenna surface, and having a second interface coupled to the second feed point; wherein the first filter is configured to attenuate far-field signals passing...
Antenna Theory - Near and Far Fields - After the antenna parameters discussed in the previous chapter, another important topic of consideration is the near field and the far field regions of the antenna.
A Compact Multiservice UHF RFID Reader Antenna for Near field and Farfield Operations This paper presents a radio frequency identification (RFID) reader antenna designed for near-field and far-field operation. The reader antenna consists of ... J Pakkathillam,M Kanagasabai,M Alsath - 《IEEE ...
4.The antenna of claim 1, wherein the second field is an electromagnetic field and the second mode of radio frequency identification is far field radio frequency identification. 5.The antenna of claim 4, wherein the electromagnetic radiation is circularly polarized. ...
5) near field antenna measurements 近场天线测量 1. The larger sampling spacing is advantageous to enhance the measurement and data processing efficiencies for near field antenna measurements. 近场天线测量中 ,采用大的采样间隔 ,有利于提高测试和数据处理的效率。 更多例句>> 6) antenna near-field ...
近场和远场的界限取决于传输的频率和电线尺寸,通常由下列两种近似公式来计算两者边界: The distant field area is refers to the electromagnetic field and the antenna separates, by plane wave way in spatial dissemination.The near field and the distant field boundary is decided by the transmission ...
An Efficient Near-field to Far-field Transformation Using the Planar Wide-mesh Scanning An effective procedure is here proposed for evaluating the antenna far field from the knowledge of near-field data collected on a planar wide-mesh grid. Th... F Ferrara,C Gennarelli,R Guerriero,... - 《...
Various mathematical expressions for the far field are substantially simpler than those for the complete radiation field. This also applies to radiation from antennae. Here, it is also of interest that objects in the near field can have a direct back-action on the antenna, while more distant ...
a既可以在快餐店吃又可以带回家吃 Both may eat in the fast-food restaurant and may bring back to the family to eat[translate] ain the ‘near field’ of the antenna. How far does the near field extend? 在`在领域’的天线附近。 多远近的领域延伸?[translate]...
Near-field to far-field transformation (NFFFT) is a frequently-used method in antenna and radar cross section (RCS) measurements for various applications. For weapon systems, most measurements are captured in the near-field area in an anechoic chamber, considering the security requirements for the...