I have spent a few days going through your website and found a lot of very useful information, but I am stuck and was wondering if you could help point me in the right direction. I have an area measuring 4 kilometers by 4 kilometers, split into areas of 150 meters by 150 meters. This area has a series of containers, boxes and other assets, and in each corner I have a pylon. I am looking to use a directional antenna from each pylon to create a box, and I want to use a passive system with no batteries to monitor when an object enters and leaves that area. Where can I find such technology? Everything I have found so far needs a battery, or the range is not good enough.
There is nothing I could recommend that would meet your precise requirements. You could potentially use a passive UHF RFID reader in each room and have battery-assisted passive (BAP) RFID transponders on each container. BAP tags have a longer read range than regular passive tags. You could also put the reader around the doorway to each room, rather than on a pylon, if you only need to know an item is in a 150-meter by 150-meter area. There are passive real-time location systems that use nodes to energize the passive tags and overhead readers that can locate a tagged object to within about 10 feet. This might also be an option if the rooms or areas are not enclosed.
—Mark Roberti, Founder and Editor, RFID Journal
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