Imodyuli yesigaba yisekethe apho isigaba se-carrier wave silawulwa ngumqondiso wokumodareyitha.Kukho iintlobo ezimbini ze-sine wave phase modulation: ukumodareyitha kwesigaba esithe ngqo kunye nokumodareyitha kwesigaba esingathanga ngqo.Umgaqo-siseko wokumodareyitha kwesigaba esithe ngqo kukusebenzisa umqondiso wokumodareyitha ukuguqula ngokuthe ngqo iiparitha ze-loop ye-resonant, ukwenzela ukuba umqondiso we-carrier nge-resonant loop ukuvelisa ukutshintshwa kwesigaba kunye nokwenza i-modulation wave wave;Indlela yokumodareyitha yesigaba esingathanga ngqo kuqala imodareyitha i-amplitude ye-modulated wave, kwaye emva koko iguqule utshintsho lwe-amplitude kwinguqu yesigaba, ukuze kuphunyezwe ukumodareyitha kwesigaba.Le ndlela yenziwa ngu-Armstrong ngo-1933, ebizwa ngokuba yi-Armstrong modulation method
I-electronic controlled microwave phase shifter yi-network ye-port-port esetyenziselwa ukubonelela umahluko wesigaba phakathi kwemveliso kunye neempawu zegalelo ezinokulawulwa ngumqondiso wokulawula (ngokubanzi i-DC bias voltage).Isixa sokutshintsha kwesigaba sinokuhluka ngokuqhubekayo kunye nomqondiso wokulawula okanye kwixabiso eliqingqiweyo elinqunywe kwangaphambili.Zibizwa ngokuba zii-analog phase shifters kunye ne-digital phase shifters ngokulandelelanayo.Imodyuli yesigaba yimodyuli yesigaba sokubini sokutshintsha isitshixo semodyuli kwinkqubo yonxibelelwano lwemicrowave, esebenzisa amaza asisikwere esiqhubekayo ukumodareyitha umqondiso womthwali.Ukumodareyitha kwesigaba samaza esine kunokwahlulwa kumodareyitha wesigaba esithe ngqo kunye nokumodareyitha kwesigaba esingathanga ngqo.Ngokusebenzisa unxulumano lokuba i-sine wave amplitude i-Angle iyinxalenye ye-frequency frequency, i-frequency modulated wave inokuguqulwa ibe yi-modulated wave wave (okanye ngokuchaseneyo).Eyona isetyenziswa ngokuqhelekileyo isekethe yemodyuli yesigaba esithe ngqo yi-varactor diode phase modulator.I-indirect phase modulation circuit inzima kakhulu kunesekhethi yemodulation yesigaba esithe ngqo.Umgaqo wayo kukuba enye indlela yesignali ye-carrier iguqulwa yi-90 ° yesigaba se-shifter kwaye ingene kwi-balanced amplitude-modulator ukucinezela i-amplitude modulation yomthwali.Emva kokunciphisa okufanelekileyo, umqondiso ofunyenweyo wongezwa kwenye indlela yomphathiswa ukuze ukhuphe umqondiso we-amplitude-modulating.Le ngqungquthela ibonakaliswe ngokuzinza okuphezulu, kodwa ukutshintshwa kwesigaba akunakuba kukhulu kakhulu (ngokuqhelekileyo ngaphantsi kwe-15 °) okanye ukuphazamiseka okukhulu.Imodyuli yesigaba esilula ihlala isetyenziswa kwii-FM zosasazo.
