He aha ka antenna periodic log?

ʻO kaAntenna Kaulike Log(LPA) i ka makahiki 1957 a he ʻano ʻē aʻe ia o ka antenna loli ʻole-alapine.

Hoʻokumu ʻia ia ma ke ʻano like: ke hoʻololi ʻia ka antenna e like me kahi kumu hoʻohālikelike τ a like nō hoʻi me kona ʻano mua, loaʻa i ka antenna ka hana like ke ʻano ʻo f a me τf. Nui nā ʻano o nā antennas periodic log, a ʻo ka Log Dipole Antenna (LDPA) i hāpai ʻia i ka makahiki 1960 he mau ʻano bandwidth ākea loa a me kahi ʻano maʻalahi, no laila ua hoʻohana nui ʻia i nā hui pōkole, ultra-shortwave a me microwave.

Hoʻopuka hou ka antenna periodic log i ke ʻano radiation a me nā ʻano impedance i kēlā me kēia manawa. Eia nō naʻe, no kahi antenna me ia ʻano, inā ʻaʻole emi loa ʻo τ ma mua o 1, he liʻiliʻi loa ka loli o kona mau ʻano i loko o hoʻokahi pōʻaiapuni, no laila he kūʻokoʻa ia mai ka alapine (frequency).

Nui nā ʻano antennas log periodic, me nā antennas dipole log periodic a me nā antennas monopole, nā antennas V-shaped log periodic resonant, nā antennas spiral log periodic, a pēlā aku, ʻo ia ka antenna dipole log periodic maʻamau.

Ma ke ʻano he antenna ultra-wideband, ua ākea loa ka uhi ʻana o ka bandwidth, a hiki i ka 10:1, a hoʻohana pinepine ʻia no ka hoʻonui ʻana i nā hōʻailona, ​​​​ka hoʻolaha ʻana o loko a me ka uhi ʻana o nā hōʻailona elevator. Eia kekahi, hiki ke hoʻohana ʻia ka antenna periodic logarithmic ma ke ʻano he kumu hānai no nā antenna reflector microwave. ʻOiai ke neʻe nei ka wahi kūpono me ka alapine hana, pono e noho ka ʻokoʻa ma waena o ka wahi kūpono a me ke kiko ma ka band alapine hana holoʻokoʻa i loko o ka pae hoʻomanawanui i ʻae ʻia i ka wā o ke kau ʻana.