Small rf transmitter with no external antenna

Details Small rf transmitter with no external antenna Small rf transmitter with no external antenna

H - Electricity

04

B

H04B 1/02 (2006.01) H01Q 1/22 (2006.01) H04B 1/034 (2006.01) H04B 1/08 (2006.01) H04R 5/033 (2006.01) H04M 1/60 (2006.01)

Patent

CA 2250990

A portable RF transmitter (16) having an audio plug (18) which mates with the earphone or output jack of an audio source (10) and having no external antenna. The portable RF transmitter modulates audio signals from the audio source onto an FM carrier and transmits them to an FM receiver mounted on a headset. The RF transmitter uses its own ground circuit and the ground circuit of the audio source as two elements of a short dipole. The two ground circuits are electrically isolated at RF by an RF choke but connected at audio frequencies by the low impedance of the choke at audio. The choke's leakage inductance also reduces the capacitive resistance of the dipole antenna for better power dissipation.

Emetteur RF portable (16) comportant une fiche audio (18) qui s'associe à l'écouteur ou à la prise sortie d'une source audio (10) et n'ayant pas d'antenne extérieure. L'émetteur RF module les signaux audio provenant d'une source audio sur une porteuse FM et les transmet à un récepteur FM fixé sur un casque d'écoute. L'émetteur utilise son propre circuit de masse et le circuit de masse de la source audio, qui représentent les deux éléments d'un dipôle court. Les deux circuits de masse sont électriquement isolés aux RF par une bobine d'arrêt RF, mais ils sont reliés aux fréquences audio par la faible impédance de la bobine d'arrêt en fréquence audio. L'inductance de fuite de la bobine réduit en outre la résistance capacitive de l'antenne doublet, ce qui donne une meilleure dissipation de puissance.

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