Definition: Fading in wireless communication is defined as the fluctuation in the strength of the signal received at the receiver. These are basically unwanted variations introduced at the time when the signal propagates from an end to another by taking multiple paths. Fading is said to be a common characteristic of sky wave signals that …
Definition: Sudden Ionospheric Disturbances generally abbreviated as SID is a type of ionospheric abnormality which is a result of solar flares. Basically solar flares cause an abrupt increase in the ionization density in the D region of the ionosphere. Thus it is said that SID is an outcome of solar flares. SID basically causes absorption …
Definition: A radio wave propagation technique that allows the transmission of UHF and VHF electromagnetic waves through the region near the tropospheric layer of the atmosphere is known as duct propagation. Basically in duct propagation, despite being reflected from the ionosphere or gliding over the surface of the earth, the waves propagate from an end …
Definition: Space wave propagation is the type of radio wave propagation in which the radio waves are propagated either directly from transmitting antenna to receiving antenna or by getting reflected from the ground. Basically in space wave propagation, direct transmission of the signal is achieved by line of sight communication. The transmission of a signal …
Definition: A type of radio wave communication in which the electromagnetic wave propagates due to the reflection mechanism of the ionospheric layer of the atmosphere is known as sky wave propagation. Due to propagation through the ionosphere, it is also known as ionospheric wave propagation. The permissible frequency range in the case of sky wave …
Definition: A type of radio wave propagation that allows propagation of radio waves in the region between earth’s surface and ionosphere is known as Ground Wave Propagation. More simply we can say, in this type of propagation, the electromagnetic waves propagate near the surface of the earth. It is also known as surface wave propagation. …
In the previous article, we have discussed that antenna serves as an integral element of a wireless communication system. Antennas are the devices that are used to convert an electrical signal into the electromagnetic signal and electromagnetic signal back to electrical form. It acts as a key component of wireless communication thereby permitting radio wave …
Definition: Antennas are considered to be the fundamental part of a wireless communication system. An Antenna is a device that changes the RF signal into an equivalent electromagnetic wave. So that it can be transmitted into free space. As we know that antennas are required at the time of both transmission and reception. Thus radio …
BWO is an abbreviation used for Backward Wave Oscillator. It is a special type of vacuum tube used to produce microwave signals in the range of Terahertz (THz). Backward wave oscillator belongs to the group of Travelling Wave Tubes that generates oscillations at microwave frequencies. Backward wave oscillators are also known as Carcinotrons. As both …
IMPATT is an abbreviation used for IMPact ionization Avalanche Transit-Time. IMPATT diode is a very high power semiconductor device that is utilized for microwave applications. It is basically used as oscillator and amplifier at microwave frequencies. The operating range of the IMPATT diode lies in the range of 3 to 100 GHz. Basically it possesses …