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Definition of "Frequency" |
The number of complete cycles of an alternating voltage or current per unit of time. [Unit: hertz or Hz]. / [F] The number of complete cycles per second [oscillations] existing in any form of wave motion, such as the number of cycles per second of an alternating current. The rate at which the vector that generates a sine wave rotates. For a periodic function, the number of cycles or events per unit time. / In ac systems, the rate at which the current changes direction, expressed in hertz (cycles per second), A measure of the number of complete cycles of a wave form per unit of time. / Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency. / Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example, if a newborn baby's heart beats at a frequency of 120 times a minute, its period – the interval between beats – is half a second (60 seconds (i.e. a minute) divided by 120 beats). / A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves. The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish. The main advantage of a parabolic antenna is that it has high directivity. / (1) the repetition rate of a periodic signal used to represent or process a communication signal. Frequency is expressed in units of hertz (Hz). 1 Hz represents one cycle per second, 1 MHz represents one million cycles per second, and 1 GHz represents one billion cycles per second. |
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