col_implant
New Member
Hi,
Im working with a PCB loop antenna which has an impedance of about 0.1+j50 at 433.92 MHz. I need to match this to the MELEXIS TH72015 transmitter device.
The manufacturer does not give a definite impedance to match to, instead they mention an equation for an optimum load resistance. The equation is as follows:
Ropt = ((Vcc - Vsat)^2)/2*Pout
In my particular case, operating at 3V, and transmitting at -12dBm the optimum load resistance computes to 16200. Even using Q degrading to broaden the antennas bandwidth im finding it impossible to match anywhere close to this value (using real component values).
Im wondering is there another way to match my antenna to the device? Or is there some mistake in the method i have used?
Thanks
C
Im working with a PCB loop antenna which has an impedance of about 0.1+j50 at 433.92 MHz. I need to match this to the MELEXIS TH72015 transmitter device.
The manufacturer does not give a definite impedance to match to, instead they mention an equation for an optimum load resistance. The equation is as follows:
Ropt = ((Vcc - Vsat)^2)/2*Pout
In my particular case, operating at 3V, and transmitting at -12dBm the optimum load resistance computes to 16200. Even using Q degrading to broaden the antennas bandwidth im finding it impossible to match anywhere close to this value (using real component values).
Im wondering is there another way to match my antenna to the device? Or is there some mistake in the method i have used?
Thanks
C