martedì 13 novembre 2012
Un adattatore wireless consente a un dispositivo di connettersi a una rete LAN senza fili. Contiene un trasmettitore e un ricevitore radio che permettono di supporate diversi standard Wi-Fi (vedi l'articolo Router wireless), usando una o due bande di trasmissione (dual band) a seconda dello standard implementato.
Gli adattatori wireless esistono in diverse forme, molti usano la tecnologia MIMO (multiple-input multiple-output), che impiega diverse antenne sia per trasmettere che per ricevere, migliorando così le performance di comunicazione.
Un primo tipo molto diffuso sono gli adattatori PCI, che sono schede da installare nel bus PCI del proprio dispositivo.
Esempio di adattatore PCI a banda ISM con antenne omni-direzionali.
Altri adattatori usano per la connessione una delle porte USB del dispositivo.
Esempio di adattatore Wireless IEEE 802.11n con cavo usb, dual-band ISM-UNII e velocità 450 Mbps:
Adattatore USB compatto 300 Mbps con due antenne interne, da inserire direttamente nella porta del dispositivo:
Adattatore USB wireless estremamente compatto, 2 grammi per 7X15X20 mm:
Infine, le cosiddette PCMCIA sono adattatori per portatili che si inseriscono in appositi alloggiamenti (bus) del notebook, accessibili dall'esterno.
Esempi di adattatore CardBus per portatili:
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