History(from google) Guglielmo Marconi (1874-1937) Marconi improved radio transmission and receiver designs and developed the first practical systems for long distance communication by radio. In 1901 he was the first to send and receive signals across an ocean from newfoundland to Cornwall. As a result of his pioneering efforts, commercial radiotelephone service became available in later years In the 1930s the bell telephone company was working on improving heir transatlantic telephone service when they assigned Karl Jansky to investigate sources of radio static, leading to his discovery of radio waves from the milky way 上海海学信息工程学院
上海海事大学信息工程学院 History (from google) ◼ Guglielmo Marconi (1874-1937) ◼ Marconi improved radio transmission and receiver designs and developed the first practical systems for long distance communication by radio. In 1901 he was the first to send and receive signals across an ocean, from Newfoundland to Cornwall. As a result of his pioneering efforts, commercial radiotelephone service became available in later years. In the 1930s the Bell Telephone company was working on improving their transatlantic telephone service when they assigned Karl Jansky to investigate sources of radio static, leading to his discovery of radio waves from the milky way
History(from google) Heinrich Hertz(1857-1894 In 1888, Heinrich Hertz built an apparatus that could transmit and receive electromagnetic waves of about 5 meters in I length. he used a coil to generate a high voltage spark between two electrodes which served as a transmitter The detector was a loop of wire with a small gap. A spark at the transmitter produces electromagnetic waves that travel to the detector, producing a spark in the gap. He showed that the waves were polarized, and that they could interfere with each other, just as predicted by theory 上海海学信息工程学院
上海海事大学信息工程学院 History (from google) ◼ Heinrich Hertz (1857-1894) ◼ In 1888, Heinrich Hertz built an apparatus that could transmit and receive electromagnetic waves of about 5 meters in length. He used a coil to generate a high voltage spark between two electrodes which served as a transmitter. The detector was a loop of wire with a small gap. A spark at the transmitter produces electromagnetic waves that travel to the detector, producing a spark in the gap. He showed that the waves were polarized, and that they could interfere with each other, just as predicted by theory
History(from google ■ Lord rayleigh John william Strutt, 3rd Baron Rayleigh OM (12 November 1842-30 June 1919)was an English physicist who, with William Ramsay discovered the element argon, an achievement for which he earned the nobel prize for hysics in 1904. He also discovered the phenomenon now called Rayleigh scattering, explaining why the sky is blue, and predicted the existence of the surface waves now known as Rayleigh waves. In 1910 Lord Rayleigh discovered that an electrical discharge in nitrogen gas produced active nitrogen",an allotrope considered to be monatomic. The whirling cloud of brilliant yellow light"produced by his apparatus reacted with quicksilver to produce explosive mercury nitride 上海海学信息工程学院
上海海事大学信息工程学院 History (from google) ◼ Lord Rayleigh ◼ John William Strutt, 3rd Baron Rayleigh OM (12 November 1842 – 30 June 1919) was an English physicist who, with William Ramsay, discovered the element argon, an achievement for which he earned the Nobel Prize for Physics in 1904. He also discovered the phenomenon now called Rayleigh scattering, explaining why the sky is blue, and predicted the existence of the surface waves now known as Rayleigh waves. In 1910 Lord Rayleigh discovered that an electrical discharge in nitrogen gas produced "active nitrogen", an allotrope considered to be monatomic. The "whirling cloud of brilliant yellow light" produced by his apparatus reacted with quicksilver to produce explosive mercury nitride
Questions about this article a Question 1: What is this article from? Question 2: Can you give some examples about the application about RF/Microwave? 上海海学信息工程学院
上海海事大学信息工程学院 Questions about this article ◼ Question 1: what is this article from? ◼ Question 2: Can you give some examples about the application about RF/Microwave?
Example about applications of RF/Microwave ::::: went 面生 基于电子标签的集装箱管理系统结构图 上海海学信息工程学院
上海海事大学信息工程学院 Example about applications of RF/Microwave