• Mō te wehewehe i tētahi tohu kia rua ngā tohu he ōrite te kaha me te rerekētanga ā-wāhanga pumau 90°, 180° rānei.
• Mō te whakakotahitanga tapawhā, te mahi rānei i te whakakotahitanga tāpiritanga/pākētanga.
Kupu Whakataki
Ko ngā hononga me ngā ranu he taputapu e tata ana ngā raina tuku e rua tetahi ki tetahi, kia horapa ai te kaha i runga i tetahi raina hei hono atu ki tetahi atu raina. Ka wehea e te ranu 3dB 90°, 180° rānei te tohu whakauru kia rua ngā putanga kaha ōrite. Ko te tikanga, ka wehea e te hononga ahunga te tohu whakauru kia rua ngā putanga kaha kāore i ōrite. Ko tēnei kupu "hononga ahunga", "ranu 90°", me te "ranu 180°" e ahu mai ana i te tikanga. Heoi, ka taea te whakaaro ko ngā ranu 90° me te 180° he hononga ahunga 3 dB. Ahakoa ēnei āhuatanga ōrite, he rerekē rawa ngā tawhā e whakamahia ana hei whakaahua i te rere o te tohu i roto i ngā hononga ahunga me te tono, i roto i te whakamahinga tūturu, kia tika ai te whakaaro motuhake.
Whakaahuatanga Mahi o ngā Ranu 180°
He taputapu tauutuutu te ranu 180° e whakarato ana i ngā tohu ā-wāhanga e rua e rite ana te kaha ina whāngaihia mai i tōna tauranga tapeke (S) me ngā tohu ā-wāhanga e rua e rite ana te kaha 180° ina whāngaihia mai i tōna tauranga rerekētanga (D). I tētahi atu taha, ka tāpirihia ngā tohu e whakaurua ana ki ngā tauranga C me D i te tauranga tapeke (B) ā, ka puta te rerekētanga o ngā tohu e rua i te tauranga rerekētanga (A). Ko te Pikitia 1 he hoahoa mahi ka whakamahia i roto i tēnei tuhinga hei tohu i te ranu 180°. Ka taea te whakaaro ko te tauranga B te tauranga tapeke, ā, ko te tauranga A te tauranga rerekētanga. Ko ngā tauranga A me B me ngā tauranga C me D he takirua tauranga motuhake.
Ko ngā hononga ranu 90°, ko ngā hononga ranu rānei, he hononga aronga 3 dB te rahi, ā, ko te tawhiti o te tohu putanga kua honoa me te tohu putanga he 90° te tawhiti. Nā te mea ko te -3 dB te haurua o te mana, ka wehewehea te mana e te hononga 3 dB (i roto i tētahi ātete) i waenga i te putanga me ngā putanga kua honoa. Nā te rerekētanga o te 90° i waenga i ngā putanga ka whai hua ngā ranu i roto i te hoahoa o ngā attenuators taurangi hiko, ngā whakaranu ngaruiti, ngā modulators me te maha atu o ngā wāhanga me ngā pūnaha ngaruiti. E whakaatu ana te Pikitia 5 i te hoahoa ara iahiko me te ripanga pono ka whakamahia hei whakamārama i te mahi o te ranu auau RF 90°. E kitea ana i tēnei hoahoa, ko te tohu e pā ana ki tētahi tāuru ka hua ake i ngā tohu kaha rite e rua e tapawhā ana, 90° rānei, i waho o te āhua. Kua wehea ngā tauranga A me B me ngā tauranga C me D. E ai ki te kōrero i mua i te wāhanga ranu 180°, he rerekē ngā tikanga hanga a ngā taputapu auau RF me te ngaruiti. Ahakoa he ōrite ngā urupare ariā, he rerekē te wāhi me te tikanga o te tauranga. Kei raro nei, i roto i te Pikitia, ko ngā putanga "whakawhiti" me te "kore-whakawhiti" e tukuna ana mō ngā auau ngaruiti (500 MHz me runga ake) me te ripanga pono i puta mai. Ka kiia hoki ngā ranu 90 nekehanga he ranu tapawhā nā te mea he tapawhā te wehenga o te wāhanga o ngā putanga e rua (90°). Kia mahara hoki kāore he rerekētanga ko tēhea tauranga te tauranga whakauru mena ka mau tonu te whanaungatanga i waenga i ngā tauranga. Nā te mea he rite te hiko me te miihini o ngā ranu 90° ki ngā tuaka X me Y.
Ko te Si Chuan Keenlion Ngāruiti he whānuitanga o ngā piriti ranu 3DB i roto i ngā whirihoranga whāiti me te whānui, e kapi ana i ngā auau mai i te 0.5 ki te 50 GHz. Kua hangaia hei whakahaere i te mana whakauru mai i te 10 ki te 30 watts i roto i te pūnaha tuku 50-ohm. Ka whakamahia ngā hoahoa moroiti, raina rānei, ā, ka arotauhia mō te mahi pai rawa atu.
Kei ngā waeine he hononga SMA, he hononga N rānei, he hononga 2.92mm, 2.40mm, me te 1.85mm rānei mō ngā wāhanga auau teitei.
Ka taea hoki e mātou te whakarite i te Piriti Ranu 3DB kia rite ki ō hiahia. Ka taea e koe te tomo ki te whārangi whakaritenga hei whakarato i ngā whakatakotoranga e hiahiatia ana e koe.
Wā tuku: Oketopa-09-2022
