Frequencies[edit]
Main article: Radio spectrum
| Frequency | Wavelength | Designation | Abbreviation[5] |
|---|---|---|---|
| 3 – 30 Hz | 105 – 104 km | Extremely low frequency | ELF |
| 30 – 300 Hz | 104 – 103 km | Super low frequency | SLF |
| 300 – 3000 Hz | 103 – 100 km | Ultra low frequency | ULF |
| 3 – 30 kHz | 100 – 10 km | Very low frequency | VLF |
| 30 – 300 kHz | 10 – 1 km | Low frequency | LF |
| 300 kHz – 3 MHz | 1 km – 100 m | Medium frequency | MF |
| 3 – 30 MHz | 100 – 10 m | High frequency | HF |
| 30 – 300 MHz | 10 – 1 m | Very high frequency | VHF |
| 300 MHz – 3 GHz | 1 m – 10 cm | Ultra high frequency | UHF |
| 3 – 30 GHz | 10 – 1 cm | Super high frequency | SHF |
| 30 – 300 GHz | 1 cm – 1 mm | Extremely high frequency | EHF |
| 300 GHz - 3000 GHz | 1 mm - 0.1 mm | Tremendously high frequency | THF |
The inverse relation between frequency and wavelength deduces that the higher the frequency of the RF Signal, the smaller its wavelength and vice versa. Thus, under similar conditions of propagation, the higher frequency signal attenuates faster than the lower frequency signal and becomes too weak to be detected at the end of the receiver, located at larger distances. An RF power amplifier is used to amplify the power level of such a transmitter RF Signal, so that it can travel larger distances with less attenuation.
Wifi is 2.4 GHZ,, UHF our houses are 60 HZ, is SLFand it is nice to know what you are dealing with,,
attenuateverb |əˈtenyoōˌāt| [ trans. ] (often be attenuated)reduce the force, effect, or value of : her intolerance was attenuated by a rather unexpected liberalism.• reduce the amplitude of (a signal, electric current, or other oscillation).• [ intrans. ] (of a signal, electric current, or other oscillation) be reduced in amplitude.• [usu. as adj. ] ( attenuated) reduce the virulence of (a pathogenic organism or vaccine) : attenuated strains of rabies virus.• reduce in thickness; make thin : the trees are attenuated from being grown too close together.
An RF power amplifier is a type of electronic amplifier used to convert a low-power radio-frequency signal into a larger signal of significant power, typically for driving the antenna of a transmitter. It is usually optimized to have high efficiency, high output Power(P1dB)compression, good return loss on the input and output, good gain, and optimum heat dissipation.
Applications[edit]
The basic applications of the RF power amplifier include driving to another high power source, driving a transmitting antenna and exciting microwave cavity resonators. Among these applications, driving transmitter antennas is most well known. The transmitter–receivers are used not only for voice and data communication but also for weather sensing (in the form of a RADAR).
