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A phase shift module is a microwave network module which provides a controllable phase shift of the RF signal. [ 1 ] [ 2 ] [ 3 ] Phase shifters are used in phased arrays . [ 4 ] [ 5 ] [ 6 ]
Dynamic – an array of variable phase shifters are used to move the beam; Fixed – the beam position is stationary with respect to the array face and the whole antenna is moved; There are two further sub-categories that modify the kind of dynamic array or fixed array. Active – amplifiers or processors are in each phase shifter element
Morse code is called the original digital mode. Radio telegraphy, designed for machine-to-machine communication is the direct on / off keying of a continuous wave carrier by Morse code symbols, often called amplitude-shift keying or ASK, may be considered to be an amplitude modulated mode of communications, and is rightfully considered the first digital data mode.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Phase_shifter&oldid=258047886"This page was last edited on 15 December 2008, at 03:40 (UTC). (UTC).
Binary phase-shift keying (BPSK) is used in the 868 and 915 MHz bands, and offset quadrature phase-shift keying (OQPSK) that transmits two bits per symbol is used in the 2.4 GHz band. The raw, over-the-air data rate is 250 kbit/s per channel in the 2.4 GHz band, 40 kbit/s per channel in the 915 MHz band, and 20 kbit/s in the 868 MHz band.
Additionally, fine control of the beam direction can be provided with variable phase shifters in addition to the fixed phase shifters. [10] By using the variable phase shifters in combination with switching the power to the beam ports, a continuous sweep of the beam can be produced.
The modulator alters some aspect of the carrier signal, such as its amplitude, frequency, or phase, with the baseband signal, "piggybacking" the data onto the carrier. The result of modulating (mixing) the carrier with the baseband signal is to generate sub-frequencies near the carrier frequency , at the sum ( f C + f B ) and difference ( f C ...
400 MVA 220/155 kV phase-shifting transformer.. A phase angle regulating transformer, phase angle regulator (PAR, American usage), phase-shifting transformer, phase shifter (West coast American usage), or quadrature booster (quad booster, British usage), is a specialised form of transformer used to control the flow of real power on three-phase electric transmission networks.