Dec 14, 2014  We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime. France: Paris. Home; Tarsus, Turkey; Chiang Mai, Thailand; Firenze, Italy; Freiburg Im Breisgau, Germany.

The Ukrainian T-shaped Radio telescope UTR-2. With its antenna array of 150,000 square meters, it is the world’s largest low-frequency radio telescope at decametre wavelengths built in 1969 near the village of Hrakovo about 60 km south-west from Kharkov, USSR. The antenna array consists of 2040 broadband cage dipoles. It is interesting to note that the same fully operational Soviet-made radio receivers R-250M2 and other equipment produced in the late 1960s. This photo was taken in 1973 during the author’s summer internship at the site The Antennas Around Us. Xiaomi MI-5 smartphone antennas: 1 — NFC antenna, 2 — GPS antenna, 3 — Wi-Fi/Bluetooth antenna, 4 — main antenna When I start writing an article for the TranslatorsCafe.com Unit Converter, I often check my pockets, look around, then out the window and calculate things I am writing about.

This time I am writing about antennas. So, let’s count: • Five antennas in my mobile phone Xiaomi Mi-5: • main antenna to communicate with cell towers, • GPS and GLONASS antenna, • Wi-Fi antenna and Bluetooth antenna. 2.4 GHz 2 dBi Wi-Fi rubber ducky antenna design; left — the assembled antenna, middle and right — the disassembled antenna. This vertically polarized 360° omnidirectional antenna is used for the wireless router. It is essentially a dipole antenna, in which the inner exposed conductor is ¼ wavelength long. The metal sleeve is also ¼ wavelength long.

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So, this looks like 130-year-old technology invented by Heinrich Hertz in 1886• near-field communication antenna, • FM receiver antenna in the form of headphones cable • Three antennas in an old iPhone • Almost the same number of antennas in my smartwatch. In the rear window of almost any car one can see an AM and FM antenna system integrated with the defogger heating elements • Several hundred antennas can be seen from my window: antennas in and on the cars in the parking lot, TV, satellite TV, antennas for amateur radio, cellular network antennas on high buildings. I can see an antenna field consisting of four 1010 kHz medium wave (MW) tower antenna array of AM radio station CFRB Newstalk 1010 (Toronto) and one 6.07 MHz shortwave tower antenna of simulcast CFRX radio. Hawking Hi-Gain HWL2 Wi-Fi Locator 2.4 GHz 5 dBi antenna design. Devices like this one were conveniently used to find Wi-Fi hotspots in the early 2000s, before the mass adoption of the smartphones. In total, I’ve got three dozen antennas in my apartment and several hundred can be seen from the window of my apartment.

I cannot find some fresh language, therefore I will say that. We are surrounded by antennas. So, let us talk about them in more detail. We will try to do it without using any formulas so that it is clear even to those who do not like math! Webster’s Dictionary defines an antenna in radio and electronics as a metallic device, variously shaped, designed for the purpose of either transmitting or receiving radio waves. In other words, it is a device that converts the electric power of a transmitter into electromagnetic waves or electromagnetic waves into electric power to be amplified by a receiver.

Most antennas operate efficiently only over a relatively narrow frequency band because they are resonant devices. To get a good reception or transmission, any antenna must be tuned to the frequency band of the radio transmitting or receiving system to which it is connected. At the end of the 19th century, there were only a few antennas in the world. They were used to demonstrate transmission and receiving electromagnetic waves. 130 years later, in the 21st century, an average person carries several antennas in his pocket and has several dozen antennas in his home.

Even refrigerators, stoves and ranges have Wi-Fi antennas nowadays! Michael Faraday’s Laboratory at the Royal Institution in London Antenna History We should probably start telling the history of antennas, describing optical communications using smoke signals and acoustic communications using drums. The first experiments that involved electricity and magnetism together and showed the relationship between them were done by Michael Faraday in his laboratory now on display at the Royal Institution in London (pictured). The electronic communication started with the invention of the telegraph in the middle of the 19th century. Later, James Clerk Maxwell predicted the existence of electromagnetic waves. Maxwell’s theory was proved by the experiment of Heinrich Hertz who created the first dipole antennas and used them with reflectors to transmit radio waves with a frequency of about 450 MHz. Hertz also demonstrated polarization of radio waves using two perpendicular antennas.