# Antenna and Wave propogation

## Radio Wave Propagation

Radio Wave Propagation deals with the behaviour of radio waves when the waves travel from one end to another. It is sometimes known as simply wave propagation or propagation of electromagnetic waves. Radio wave transmission is a quite prominent method by which information can be transferred from one end to another. Radio wave propagation is …

## Propagation Characteristics of Radio Waves

In the radio-frequency spectrum, the various frequency ranges possess different propagation characteristics thus each part of the spectrum is used for specific types of applications. The propagation characteristics of radio waves show high dependency on frequency. In the previous content on the radio frequency spectrum, we have discussed that a part of the electromagnetic spectrum …

## Antenna Temperature

Antenna Temperature, in reality, is not the actual temperature of the physical device(antenna). Basically, Antenna Temperature is defined as the temperature of the region present near and distant to the surroundings that are coupled to the antenna via radiation resistance. It is also known as antenna noise temperature and is not an inherent property of …

## Antenna Directivity

Antenna Directivity is measured in correspondence to the concentration of the radiated energy by the transmitting antenna specifically in a particular direction. While for the receiving antenna, directivity represents the ability of the antenna to gather most of the radiated energy from a specific direction. Introduction Directivity is associated with antenna gain and antenna efficiency. …

## Antenna Impedance

Antenna Impedance is related to the electric and magnetic fields and is defined at the terminal point of the antenna system as the ratio of voltage or current across the particular terminal. The impedance of the antenna is a crucial parameter of the antenna system. Content: Antenna Impedance Introduction Impedance of Antenna Self Impedance Mutual …

## Radiation Pattern of Antenna

Radiation Pattern of Antenna shows the distribution of energy radiated by the antenna in space. More simply, the radiation pattern is a trace out that corresponds to the radiation properties of the antenna in space coordinates (i.e., with respect to angle and distance). It is a graphical way of showcasing the radiation from the antenna …

## Adcock Antennas

Adcock Antennas are basically arrangements of multiple vertical antennas in space-separated at some specific distance. It was proposed by an Engineer from British origin named Lient Adcock in 1916. Thus, so this antenna was named after him. Adcock antennas are used for the purpose of transmission or reception of directional radio waves. However, at the …

## Anechoic Chambers

Definition: “An-echoic” is a word that means “non-reflective“. Sometimes it signifies non-echoing or free of echoes. Anechoic Chambers are basically enclosed indoor rooms whose walls, ceiling, and floor are covered with a layer of absorbent that absorbs radio-frequency energy that helps to reduce reflections. As it is an indoor chamber thus, for the small antennas …

## Antenna Gain Measurement

Antenna Gain Measurement is a crucial aspect of antenna measurement. The reason behind this is that the gain of the antenna plays a very important role in predicting the performance of an antenna. Due to this reason measurement of the gain of the antenna is necessary. Content: Antenna Measurements – Gain Introduction Antenna Gain Methods …

## Antenna Measurements – Radiation Pattern

Antenna Pattern Measurement is a way of determining the radiation pattern of the antenna under test i.e., AUT. Antenna pattern or radiation pattern graphically represents the radiation properties of the antenna with respect to the space coordinates. For the measurement of antenna pattern more specifically, it can be said that it refers to the measurement …