radio frequency

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frequency

 [fre´kwen-se]
1. the number of occurrences of a periodic or recurrent process in a unit of time, such as the number of electrical cycles per second measured in hertz. In cardiac pacing terminology, frequency is expressed by the formula: frequency = ½ × pulse width.
2. the number of occurrences of a particular event or the number of members of a population or statistical sample falling in a particular class.
radio frequency the range of frequencies of electromagnetic radiation between 10 kilohertz and 100 gigahertz, used for radio communication.
relative frequency the ratio of the number of occurrences of a specified phenomenon in a population to the total size of the population.
urinary frequency urination at short intervals without increase in daily volume of urinary output, due to reduced bladder capacity or cystitis.

radio frequency

An MRI term for an electromagnetic wave with a frequency in the same range as that used for transmitting radio and television signals. The RF pulses used in MRI are usually in the 1–100 megahertz range, which cause heating of a structure or tissue due to RF pulse absorption.
References in periodicals archive ?
11p RF signal with the required content and transmits it to the Commsignia onboard unit.
Until now, RF engineers and technicians had to choose between basic RF signal generators or far more expensive vector signal generators (VSG).
BTG which markets products under the Bird Electronic and TX RX Systems brand names, produces a wide variety of RF signal measurement products ranging from spectrum analysis, power measurement, instruments and custom systems.
Using a unique combination of design skills, systems understanding and process technologies, Analog Devices RF ICs and world-leading data converters cover the entire RF signal chain and include industry-leading high-performance discrete RF function blocks as well as highly-integrated multi-functional single-chip RF solutions.
With the RSA3408A, engineers will be able to view RF signal instabilities and transients that they never knew existed.
Engineers who design RF signal chains using discrete components in the 10 MHz to 10 GHz frequency range.
By giving ground station operators easy and affordable access to recorded RF signal parameters over time, cost-effective tools such as the DEV 2190 L-Band Distribution System can help in the efforts to identify and mitigate interference.
The ADIsimRF[TM] design tool is the software accompaniment to ADI's complete portfolio of RF-to-digital functional blocks, allowing engineers to model RF signal chains using devices from across ADI's RF IC portfolio.
In drain modulation architectures, an envelope detector modulates the PA power supply from the incoming RF signal, thereby only giving the PA the power needed to properly transmit the RF signal.
Since the RF signal works through walls and furniture, users now have the option of placing their PC in an AV cabinet or closet.
The resulting RF signal is captured with an N9020A spectrum analyzer so that designers can characterize transmitter behavior and isolate defects.