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Circular vs. Linear and Dipole vs. Loop. Thoughts?
Ok, I have a question for an antenna expert. I'm a UCF student
designing a UHF RFID system for a new kind of robot positioning system, and I have two choices to make: 1. Circular vs. Linear polarized antenna for the RFID reader 2. Halfwave dipole vs. Fullwave loop antenna for the tags The reader antenna transmits a signal that electrically couples the tag antenna, inducing a current that the tag uses to transmit its ID number back to the reader. It's a long range application, so it's important that I maximize the power transfer to the tag. Here's my current understanding of the matter, let me know if I'm wrong: A L-pol reader antenna with a dipole tag antenna will get great power transfer, but there will be lots of null zones if the tag is oriented improperly. A C-pol reader antenna with a dipole tag antenna will get great orientation indifference, but power transfer to the tag will suffer. A L-pol reader antenna with a loop tag antenna will also get great orientation indifference, but sub-optimal power transfer. A C-pol reader antenna with a loop tag antenna will get both great orientation indifference and maximum power transfer. So I believe I want to do the last one, but I wanted to get some input from people with antenna experience, in case I have no idea what I'm doing, which is entirely plausible. Thanks! Nathaniel |
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