Basic Question
Basic Question
(OP)
Hi ,
This might be a basic question to most of you
I have an RFID reader and an antenna.
The reader has a maximum power output of 200mw.
The antenna has a maximum RF power of 10w.
If I connect the reader to the antenna, what will be the general RF power of the Antenna.
Thanks.
This might be a basic question to most of you
I have an RFID reader and an antenna.
The reader has a maximum power output of 200mw.
The antenna has a maximum RF power of 10w.
If I connect the reader to the antenna, what will be the general RF power of the Antenna.
Thanks.





RE: Basic Question
TTFN
RE: Basic Question
You will only get 200mW total power out of the antenna if the antenna is lossless and matched to the reader. Therefore you are unlikely to get as much as 200mW output from the antenna.
RE: Basic Question
RE: Basic Question
Effective radiated power may be increased beyond 200 mw in a particular direction thru the use of “gain” antennas which focus or compress the radiated signal in a particular direction at the expense of other directions in a manor similar to optics. My assumption is that your reader is portable and you are looking for an omni directional pattern, providing a signal in all directions much like a candle illuminates a room as opposed to a flashlight which provides light in a narrow beam in one direction.
*(Assuming the feed line has low losses and the antenna is a resonate 1/4 wave or half wave antenna at the frequency of operation and the feed line is matched to the antenna on one end and the reader on the other.)
Good luck.