Apr 20, 2006 #1 G geppei Junior Member level 3 Joined Apr 20, 2006 Messages 31 Helped 0 Reputation 0 Reaction score 1 Trophy points 1,286 Activity points 1,489 I am using a freescale ZigBee transceiver which has a differential tx and rx port in matching the dipole antenna to the port, what impedance of the dipole should be ? because i am confused by differeential impedance. is it also a 50Ohm matching? but in the case, a differentiial impedance with 50Ohm?
I am using a freescale ZigBee transceiver which has a differential tx and rx port in matching the dipole antenna to the port, what impedance of the dipole should be ? because i am confused by differeential impedance. is it also a 50Ohm matching? but in the case, a differentiial impedance with 50Ohm?
Apr 20, 2006 #2 V vfone Advanced Member level 6 Joined Oct 10, 2001 Messages 5,709 Helped 1,616 Reputation 3,237 Reaction score 1,248 Trophy points 1,393 Activity points 36,250 The impedance of a dipole in free-space is approximately 72 ohms. The impedance of a microstrip dipole is affected by the substrate. To match the dipole you need a balun. **broken link removed**
The impedance of a dipole in free-space is approximately 72 ohms. The impedance of a microstrip dipole is affected by the substrate. To match the dipole you need a balun. **broken link removed**
Apr 21, 2006 #3 T tomcat_x Member level 1 Joined Nov 26, 2004 Messages 41 Helped 6 Reputation 12 Reaction score 0 Trophy points 1,286 Activity points 356 The default for matching network is 50 ohm . But it could change the impedance in variable frequency with reality. so you can see return loss (s11) for your reference . Normally , for VSWR < 2 The return loss is lower than -10 dB . It's also used to define the bandwidth .
The default for matching network is 50 ohm . But it could change the impedance in variable frequency with reality. so you can see return loss (s11) for your reference . Normally , for VSWR < 2 The return loss is lower than -10 dB . It's also used to define the bandwidth .