Solid-state microwave relaysystems inJapan Since thefirst link wasintroduced adecade andahalf ago, Japan's microwave relay network hasexpanded until itnowspans theentire country. Andtherapid progress inthedevelopment ofsolid-state techniques should accelerate this growth evenfurther
Yasuaki Ninomiya · 1969
.r ~~~~Inresponse totherapidly increasing demandfor comt Ma ~~~~munication facilities, microwave relay systems have ~~~played an importantrolein Japan's telecommunications network because ottheir economy andcapability o/OOg f~~~or broadband transmission. Their progress hasbeen /0 °? ~~~~marked during thepast 20years andthis development / @a ~~~~has beensupported byadvances insuchdiverse fields / ~~~~~~as radio propagation, antennas, microwave andelec[ t~~~~~~~ronic circuitry, electron devices, and, particularly, in / ~~~~~~~solid-state techniques. This article reviews thehistory / ~~~~~~~of microwave relay systems anddescribes thepast and / ~~~~~~~expected future contributions otthesolid-state techl ~~~~~~~~nology tothese systems. Amami ^/ ~~~~~~~~~During thepast 15years Japan's microwave network / ~~~~~~~~~~has expanded rapidly tomeettheever-increasing demand Z ~~~~~~~~~~~for communication facilities. Theuseofmicrowave relay / ~~~~~~~~~~~by theJapanese dates back to1954, whenthefirst comt ~~~~~~~~~~~~mercial