With the passage of time, the internet era is becoming increasingly
widespread. Wireless is now a household name. Today, an electronic antenna
manufacturer will take you on a journey into the internet age.
We know that radio equipment, such as communications, radar, navigation,
broadcasting, and television, all transmit information via radio waves and
require both the radiation and reception of radio waves. In radio equipment, the
device used to radiate and receive radio waves is called an antenna. Antennas
provide the necessary coupling between the transmitter or receiver and the
medium that propagates the radio waves. Antennas, like transmitters and
receivers, are also essential components of radio equipment.
Antennas radiate and receive radio waves. However, the waves sent from the
transmitter to the antenna via the feeder are not radio waves, and the receiving
antenna cannot directly transmit radio waves to the receiver via the feeder;
they must undergo an energy conversion process. Below, we will use radio
communication equipment as an example to analyze the signal transmission process
and further illustrate the energy conversion function of antennas. At the
transmitting end, the modulated high-frequency oscillating current (energy)
generated by the transmitter is fed into the transmitting antenna via a feed
device (the feed device can directly transmit current waves or electromagnetic
waves, depending on the frequency and form). The transmitting antenna converts
the high-frequency current or guided waves (energy) into radio waves—free
electromagnetic waves (energy)—which are radiated into the surrounding space
(see Figure 1). At the receiving end, the radio waves (energy) are converted
into high-frequency current or guided waves (energy) by the receiving antenna
and transmitted via the feed device to the receiver. As can be seen from the
above process, the antenna is not only a device that radiates and receives radio
waves, but also an energy converter, serving as an interface between circuits
and space.
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