The history of the antenna (you can use it in the paper): How did the antenna originate? I ruled out compasses because although they receive magnetic fields in a sense, they are not electromagnetic fields. Ben. Franklin's kite experiment is not like an antenna, because it captures the discharge of lightning, which is a DC path, and the energy is not independent of the medium. The human eye certainly receives high-frequency electromagnetic waves (light, for the Lyman system). Technically, eyes can be classified as antennas; But because it can't emit radio waves, it is actually a sensor, so I also ruled it out.

Faraday completed the first experiment involving electromagnetic coupling around 1830 and proved the clear relationship between them. He moved a magnet around a coil connected to an ammeter. When moving a magnet, he actually produces a time-varying magnetic field, and as a result (from Maxwell's equation) there must be a time-varying electric field. The coil acts as a loop antenna, receiving electromagnetic radiation, which is received (detected) by the galvanometer-the work of the antenna. Interestingly, the concept of electromagnetic wave has not been thought of at this time. Heinrich? Hertz developed a wireless communication system, in which he produced an electric spark in the gap of a dipole antenna. He used a loop antenna as a receiver and observed a similar effect. This is 1886. By 190 1, Marconi had sent the message to the other side of the Atlantic. He used some vertical wires connected to the ground as transmitting antennas. On the other side of the Atlantic, the receiving antenna is a 200-meter kite.

1906, Columbia University had an experimental radio station, where they used aerial transmitters. This is a transmitter made of wires, suspended in the air like a cage.

Yagi Yutian antenna, 1920s angular antenna, 1939. Interestingly, in the early antenna literature, the waveguide was called "hollow metal tube". Antenna array, reflecting paraboloid 1940s, 1940s later, 1950s earlier? Just guessing. Patch antenna, Fabry-Perot antenna in1970s, antenna research in1980s involves metamaterials (designed dielectric constant and permeability can be negative at the same time, allowing interesting properties similar to negative refractive index). Current research focuses on making antennas smaller, especially for personal wireless communication devices (such as mobile phones). A lot of work is on the numerical model of antennas, so that their characteristics can be predicted before construction and testing.

I hope I can add a little depth to your paper. Hmm. How interesting