Menene eriya ta lokaci-lokaci ta log

TheEriya ta Lokaci-lokaci ta RijistaAn gabatar da (LPA) a shekarar 1957 kuma wani nau'in eriya ce mai canzawa mara mizani.

An gina ta ne bisa ga irin wannan ra'ayi: lokacin da aka canza eriya bisa ga wani ma'auni na τ kuma har yanzu tana daidai da tsarinta na asali, eriya tana da irin wannan aiki lokacin da factor ɗin yake f da τf. Akwai nau'ikan eriya na lokaci-lokaci da yawa, waɗanda daga cikinsu akwai Antenna na Log Dipole (LDPA) da aka gabatar a shekarar 1960 yana da halaye masu faɗi sosai na bandwidth da tsari mai sauƙi, don haka an yi amfani da ita sosai a cikin gajerun raƙuman ruwa, matattarar raƙuman ruwa mai ƙarfi da microwave.

Eriya mai tsawon lokaci tana maimaita tsarin radiation da halayen impedance lokaci-lokaci. Duk da haka, ga eriya mai irin wannan tsari, idan τ bai kai ƙasa da 1 ba, canjin halayenta a cikin zagaye ɗaya ƙanƙanta ne, don haka ba ta da alaƙa da mita.

Akwai nau'ikan eriya na log periodic da yawa, gami da eriya na log periodic dipole da eriya na monopole, eriya masu siffar V, eriya masu siffar log periodic spiral, da sauransu, waɗanda suka fi yawa sune eriya ta log periodic dipole.

A matsayin eriya mai faɗi sosai, murfin bandwidth yana da faɗi sosai, har zuwa 10:1, kuma galibi ana amfani da shi don faɗaɗa sigina, rarrabawa a cikin gida da kuma rufe siginar lif. Bugu da ƙari, eriya mai lokaci na logarithmic kuma ana iya amfani da ita azaman tushen ciyarwa ga eriya masu haskaka microwave. Tunda yankin mai tasiri yana motsawa tare da mitar aiki, karkacewar da ke tsakanin yankin mai tasiri da mayar da hankali a cikin dukkan mitar aiki dole ne ya kasance cikin kewayon haƙurin da aka yarda yayin shigarwa.