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    Folded dipole antenna

     

    A folded dipole antenna is a dipole antenna folded nyuma, kushikamana na kila mmoja saa zote miisho. Aina hii ya a kitanzi, inavyoonekana katika Kielelezo 1.

    tafadhali Bonyeza hapa kupata antenna wetu dipole

    Kielelezo 1.folded dipole antenna urefu "L".

    Katika hali ya kawaida, upana of ya folded dipole antenna "D" ni kiasi kidogo kuliko ya urefu "L".

    Fomu kitanzi kufungwa of ya folded dipole, mtu anaweza kutarajia pembejeo Impedans inategemea in mfupi sana mkato wa umeme line maambukizi urefu "L" pembejeo Impedans. Hata hivyo, wewe unaweza kufikiria Kwamba ya folded dipole antenna as sambamba mbili short-mzunguko line maambukizi urefu L / 2 (midpoint kutengwa na ya kulisha in Kielelezo 1). The awali Impedans ya ya folded dipole antenna Impedans line maambukizi of urefu L / 2 kazi.

    Aidha, kwa sababu of ya folded dipole folded, ya sasa inaweza kuimarishwa, Badala ya zitafutana. Kwa hiyo, ya pembejeo Impedans mapenzi Pia hutegemea Impedans of ya dipole antenna urefu "L".

    Hebu Z_d kwa niaba ya ya urefu of ya dipole antenna Impedans kwa ya Impedans of ya L Z_t kwa niaba ya Impedans uhamisho Mpya urefu L / 2, Ambayo is:

     

    The folded dipole pembejeo Impedans Z_A ni:

     
     

     

     

    The folded dipole antenna resonance na mionzi, as vizuri as isiyo ya kawaida integer mafungu ya nusu wavelength (0.5, 1.5, ...) hii ni kweli antenna, Shirikisho Reserve kama inavyoonekana katika Kielelezo 1 katika kituo cha. Pembejeo Impedans ya ya folded dipole is juu kuliko a mara kwa mara dipole. hii mapenzi be umeonyesha katika sehemu inayofuata.

    Unaweza be folded dipole antenna resonant in hata mafungu of nusu ya wavelength (1.0, 2.0, ...), Ambayo wanaweza kukabiliana folded dipole kulisha Kielelezo 1 (karibu juu au chini makali ya folded dipole).

    Nusu ya wavelength folded dipole

    Folded dipole antenna of nusu ya wavelength antenna Impedans yanaweza kupatikana kutoka juu formula kwa ya ZA. ZA = 4 * ZD. Resonance, Ambayo ni kuhusu a nusu-wimbi dipole antenna Impedans of 70 ohms. Kwa hiyo, ya folded nusu-wimbi dipole antenna pembejeo Impedans ni 280 ohms.

    duplex maambukizi line tabia Impedans is 300 ohm folded dipole kushikamana, Kwa kawaida kutumia aina hii ya Mpya. hii kuzalisha bora nguvu uhamisho kutoka ya line maambukizi antenna. Kwa hiyo, ya nusu ya wavelength folded dipole antenna is kawaida kutumika kwa kubwa antenna Impedans (Zaidi ya 100 ohms).

    Nusu-wavelength folded dipole mionzi ya muundo, Sawa fomu ya nusu ya wavelength dipole.

    tafadhali Bonyeza hapa kupata antenna wetu dipole

     

     

     

     

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    << Utafiti kwa Dipole Antenna katika TagDIY nusu-wimbi dipole kupambana na kimbunga antenna, kuwaambia jinsi ya kufanya nusu-wimbi dipole kupambana na kimbunga antenna >>

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