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ANSI and IEC standard schematic symbol for a circulator (with each waveguide or transmission line port drawn as a single line, rather than as a pair of conductors). In electrical engineering, a circulator is a passive, non-reciprocal three- or four-port device that only allows a microwave or radio-frequency (RF) signal to exit through the port directly after the one it entered.
An active circulator can be constructed using one of several different technologies. One early technology is the use of transistors as the active devices to perform the non-reciprocal function. [ 1 ] Varactor circuits are another technology, relying on a time-varying transmission line structure, driven by a separate pump signal. [ 2 ]
The UHF system supports stationary and mobile users including manportable, ships, submarines, aircraft and other mobile terminals. The UFO Follow-On system is scheduled for replacement by the Mobile User Objective System (MUOS).
A 10 dB 1.7–2.2 GHz directional coupler. From left to right: input, coupled, isolated (terminated with a load), and transmitted port. A 3 dB 2.0–4.2 GHz power divider/combiner.
In acoustical engineering, an acoustic circulator is a non-reciprocal three-port device that couples airborne sound waves only to an adjacent port in the direction of circulation. Compared to radio frequency (RF) and microwave circulators , acoustic circulators are for airborne sound waves rather than for RF and microwave electromagnetic signals.
Optical Circulator symbol. An optical circulator is a three- or four-port optical device designed such that light entering any port exits from the next. This means that if light enters port 1 it is emitted from port 2, but if some of the emitted light is reflected back to the circulator, it does not come out of port 1 but instead exits from port 3.
A diplexer is a passive device that implements frequency-domain multiplexing.Two ports (e.g., L and H) are multiplexed onto a third port (e.g., S). The signals on ports L and H occupy disjoint frequency bands.
This list does not include handheld, portable or consumer grade equipment. Those that include VHF or UHF can be termed wideband receivers, whereas those without HF would be termed scanners, or surveillance receivers. Receivers without controls, that are operated or implemented in computers are in the list of software-defined radios.