He aha ka log periodic antenna

ʻO kaAntenna Makahiki(LPA) i manaʻo ʻia ma 1957 a he ʻano ʻē aʻe o ka antenna non-frequency-variable.

Hoʻokumu ʻia ia ma ka manaʻo like aʻe: ke hoʻololi ʻia ka antenna e like me ke kumu proportional τ a ua like pū me kona ʻano kumu, ua like ka hana o ka antenna inā ʻo ka f a me ka τf. Nui nā ʻano o ka log periodic antennas, ma waena o ka Log Dipole Antenna (LDPA) i manaʻo ʻia i ka makahiki 1960 he ākea ākea nā hiʻohiʻona bandwidth a me kahi ʻano maʻalahi, no laila ua hoʻohana nui ʻia i nā puʻupuʻu pōkole, ultra-shortwave a me microwave.

Hoʻopuka hou ka log periodic antenna i ke ʻano radiation a me nā hiʻohiʻona impedance i kēlā me kēia manawa. Eia naʻe, no ka antenna me ia ʻano, inā ʻaʻole ʻoi aku ka liʻiliʻi o τ ma mua o 1, liʻiliʻi loa ka hoʻololi ʻana o kona mau hiʻohiʻona i loko o ka pōʻai hoʻokahi, no laila kūʻokoʻa maoli ia i ke alapine.

Nui nā ʻano o ka log periodic antennas, me ka log periodic dipole antennas a me ka monopole antennas, log periodic resonant V-shaped antennas, log periodic spiral antennas, etc., i waena o ka mea maʻamau ka log periodic dipole antenna.

Ma ke ʻano he antenna ultra-wideband, ākea loa ka uhi ʻana o ka bandwidth, a hiki i 10: 1, a hoʻohana pinepine ʻia no ka hoʻonui ʻana i ka hōʻailona, ​​ka hāʻawi ʻana i loko a me ka uhi hōʻailona elevator. Eia kekahi, hiki ke hoʻohana ʻia ka antenna logarithmic periodic i kumu hānai no nā antennas reflector microwave. Ma muli o ka neʻe ʻana o ka wahi kūpono me ka alapine hana, ʻo ka ʻokoʻa ma waena o ka ʻāpana kūpono a me ka nānā ʻana i ka hui alapine hana holoʻokoʻa pono i loko o ka pae ʻae ʻae ʻia i ka wā o ka hoʻokomo ʻana.