Kodi mlongoti wa periodic ndi chiyani

TheLog Periodic Antenna(LPA) idapangidwa mu 1957 ndipo ndi mtundu wina wa mlongoti wosasinthasintha.

Zimachokera ku lingaliro lofananalo: pamene mlongoti umasinthidwa molingana ndi chinthu china chofanana ndi τ ndikukhalabe chofanana ndi mapangidwe ake oyambirira, mlongoti umakhala ndi ntchito yofanana pamene chinthu ndi f ndi τf. Pali mitundu yambiri ya tinyanga za log periodic, zomwe Log Dipole Antenna (LDPA) yomwe idaperekedwa mu 1960 ili ndi mawonekedwe otambalala kwambiri komanso mawonekedwe osavuta, kotero yakhala ikugwiritsidwa ntchito kwambiri mumagulu a shortwave, ultra-shortwave ndi ma microwave.

Logi periodic antenna imangobwereza mawonekedwe a radiation ndi mawonekedwe a impedance nthawi ndi nthawi. Komabe, kwa mlongoti wokhala ndi mawonekedwe oterowo, ngati τ sikuchepera 1, kusintha kwa mawonekedwe ake mkati mwa chizungulire chimodzi kumakhala kochepa kwambiri, kotero sikudalira pafupipafupi.

Pali mitundu yambiri ya tinyanga ta log periodic, kuphatikiza tinyanga ta dipole periodic ndi tinyanga ta monopole, tinyanga tating'onoting'ono tokhala ngati V, tinyanga tating'onoting'ono tomwe timazungulira, ndi zina zambiri.

Monga ultra-wideband antenna, kufalikira kwa bandwidth ndikotambasuka kwambiri, mpaka 10: 1, ndipo nthawi zambiri amagwiritsidwa ntchito pokulitsa ma siginecha, kugawa m'nyumba ndi kuphimba ma siginecha a elevator. Kuphatikiza apo, mlongoti wa logarithmic periodic antenna utha kugwiritsidwanso ntchito ngati gwero la chakudya cha tinyanga ta microwave. Popeza kuti malo ogwira ntchito amayenda ndi mafupipafupi ogwiritsira ntchito, kupatuka pakati pa malo ogwira ntchito ndi kuyang'ana mu gulu lonse la ma frequency ogwiritsira ntchito kuyenera kukhala mkati mwa kulekerera kovomerezeka panthawi yoika.