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...
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 ...
In this paper, a novel broadband Tag antenna for ultra-high frequency (UHF) near-field and far-field radio-frequency identification (RFID) applications is presented. This antenna is printed on an Rogers RT/duroid 5880 substrate with an overall size of 68 × 19.7 × 0.787 mm. The...
The antenna prototype is fabricated and the measured bandwidth is around 13.5MHz (915.5-929MHz), which covers the China RFID Band (920-925MHz). The measured reading distance achieves 65mm with the near-field RFID tag and 1.17m with the far-field tag. The measurement agrees well with ...
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]...
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 ...
3.The antenna of claim 1, wherein the first field is a magnetic field and the first mode of radio frequency identification is near field radio frequency identification. 4.The antenna of claim 1, wherein the second field is an electromagnetic field and the second mode of radio frequency ident...
ntenna Measurements Efficient Near-Field to Far-Field Transformation Techniques for Antenna MeasurementsEfficient Near-Field to Far-Field Transformation Techniques for Antenna MeasurementsFernando LasHerasT.K. Sarkar
In this paper we report some results on the estimation of the far-field of an antenna by using a low-cost amplitude-only near-field measurement setup. A simple experimental setup is used to measure the intensity of the near-field of the antenna under test on two planes. The measured inten...
The theory and technology correlative with network analyzer in the antenna near-field measurement system are deeply studied in this dissertation. 本文对平面近场测量系统中有关网络分析仪的理论及技术进行了深入研究,包括一种高性能的网络分析仪的测量精度分析,对其控制进行自动幅相信号采集以及使用这一型号网络...