Nūhou

Manawa: 2021-11-10

A kānana band-passhana:

ʻO kahi kānana kūpono e loaʻa i kahi passband paʻa loa, no ka laʻana, ʻaʻohe loaʻa i ka passband a i ʻole attenuation ma nā alapine āpau ma waho o ka passband ua attenuate loa. ʻOiaʻiʻo, ʻaʻohe kānana band-pass kūpono. ʻAʻole hiki i ka kānana ke manaʻo i nā alapine āpau ma waho o ke alapine e hōʻemi loa ʻia, ʻo ia hoʻi, aia kahi band e attenuated akā ʻaʻole i kaʻawale. ʻO kēia ka mea maʻamau i kapa ʻia ʻo ka kānana roll-off phenomenon, a me ka attenuation i dB i kēlā me kēia ʻumi makahiki e hōʻike. ʻO ka mea maʻamau, hoʻāʻo ka hoʻolālā kānana e hōʻoia i ka rolloff e hōʻemi i ke ʻano o ka hana ʻoi aku ka maikaʻi o ia hoʻolālā kānana. Eia naʻe, me ka liʻiliʻi a me ka liʻiliʻi o ka laula o ka roll-off, ʻaʻole palahalaha hou ka pass-band - hoʻomaka e ʻike ʻia e "ripple". ʻIke ʻia kēia hanana ma ka ʻaoʻao passband, ua kapa ʻia kēia hopena ʻo Gibbs phenomenon.

kānana lua

ʻO ka kānana lua he kānana microwave me kahi ʻano o ka lua resonant. Hiki ke like ka lua me ka inductance e like me ka capacitor e hana i kahi pae resonant e ʻike ai i ka hana kānana microwave. Ke hoʻohālikelike ʻia me nā ʻano kānana microwave ʻē aʻe, ʻo ka kānana cavity kahi hoʻolālā paʻa, kūpaʻa a hilinaʻi ka hana, ka waiwai Q kiʻekiʻe, ka hoʻokuʻu wela maikaʻi, a ʻo kāna passband parasitic kiʻekiʻe i kahi mamao loa. No laila, hoʻohana ʻia ka kānana cavity i nā kikowaena kumu kamaʻilio nui. He mea maʻamau ka hoʻohana ʻana o ka hāmeʻa.

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