jancambodia
Newbie level 6
transmit return loss
Hi
I have 2 questions about a monostatic (single antenna) UHF RFID system. For example:
(1) If I have an antenna with 20 dB return loss and the output power of the transmitter is 30 dBm, then only +20 dBm will be radiated. If the desired radiation power of the antenna is +30dBm (no EIRP), then the output power of the transmitter has to be increased by 10 dBm to compensate for return loss... Is this correct?
(2) When the reader is transmitting, a part of the signal is reflected due to antenna return loss and a part is leaked through the isolator component (eg. circulator) and flows into the receiver. How can one determine the signal strength that flows in the receiver, when it consists of these two signals. Is the signal strength dependent on the phase between these two signals? And is there a formula for this?
Thanks in advance
Jan
Hi
I have 2 questions about a monostatic (single antenna) UHF RFID system. For example:
(1) If I have an antenna with 20 dB return loss and the output power of the transmitter is 30 dBm, then only +20 dBm will be radiated. If the desired radiation power of the antenna is +30dBm (no EIRP), then the output power of the transmitter has to be increased by 10 dBm to compensate for return loss... Is this correct?
(2) When the reader is transmitting, a part of the signal is reflected due to antenna return loss and a part is leaked through the isolator component (eg. circulator) and flows into the receiver. How can one determine the signal strength that flows in the receiver, when it consists of these two signals. Is the signal strength dependent on the phase between these two signals? And is there a formula for this?
Thanks in advance
Jan