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Hardware | Antenna
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| Narrow beam RFID |
| by Robert Gregg |
We are proposing an application that would require a very narrow beam antenna in order to determine when a machine is DIRECTLY in front of a tag. We were told that an antenna with a 2 degree beam width was available, but we have not been able to locate any such device.
What would it take to custom make a device that would restrict the beam and would this be done more easily with a low or high frequency tag?
Thanks |
| Question last updated on May 16, 2006, 19:21 PM |
| Total views: 5097 |
| Answer |
| by William Sanborn, Robert Gregg |
The beam width of any antenna is a relationship between the frequency and size of the device.
In general, the higher the frequency, the narrower the beam at any given size. So, to answer your second question first, high frequency tags would be better at this from that viewpoint only. You need to decide how much penetration you need and if this would interfere with other tag systems, but if this is a stand-alone application then go high.
The size of an antenna with a 2 degree beamwidth at 900 MHz is big. Really big. To make a 2 degree beam it would need to be 40-50 FEET wide. Now there are ways to creat artificial apetures. If the application is for location and can limit the location of the tag to always be at the same general point on the item/equipment/pallet/rack then it may still be possible.
What you are looking for is a unique device that may be more easily answered by a different means. |
| Answer last updated on May 17, 2006, 13:47 PM |
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