RFID Tag Antenna Feed Point With Multiple Coherent Microradios
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Solution Overview
Problem
Current RFID tags face challenges in achieving high production yields and reliable operation due to the high cost and complexity of testing individual integrated circuit microradios, especially in miniaturized forms, and the inefficiency of pick-and-place techniques for coupling chips to antennas, which limits their cost-effectiveness and range for item-level tagging.
Innovation Solution
The use of multiple integrated circuit microradios coupled to the tag antenna at its feed point, operating in a coherent and polarized manner, eliminates the need for individual testing and reduces costs by leveraging the high probability of successful operation and increased power gain, enabling longer range and better signal-to-noise ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single integrated circuit microradio is used in RFID tags, then the tag structure is simple, but the production yield is low and testing complexity increases
Solution Approach 1:
The patent combines multiple integrated circuit microradios (at least two, preferably hundreds) into a single RFID tag, depositing them at the feed point of the antenna. This merging approach increases reliability because the probability of all chips failing simultaneously is negligible, while the overall tag structure remains simple through the use of slurry-based deposition methods rather than complex assembly processes.
2Manufacturing precision
If pick-and-place techniques are used to couple chips to antennas, then individual chip placement precision is achieved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent replaces the mechanical pick-and-place technique with a slurry-based deposition process. Integrated circuit microradios are mixed in a non-conductive slurry that is printed or deposited onto the antenna feed point, eliminating the need for expensive pick-and-place machines while maintaining adequate coupling precision through the probabilistic distribution and subsequent patterning process.
3Ease of manufacture
If miniaturized RFID tags are used for item-level tagging, then tagging cost decreases, but testing individual chips becomes more costly and complicated
Solution Approach 1:
The patent uses multiple copies of the same integrated circuit microradio design in each tag. By deploying at least two chips (preferably hundreds) with identical designs, the system leverages volume production advantages and statistical probability to ensure operational reliability without requiring expensive individual testing of miniaturized chips, as the likelihood of all copies failing is negligible.
4Reliability
If multiple integrated circuit microradios are deposited at the feed point, then reliability and power gain increase, but manufacturing process complexity increases
Solution Approach 1:
The patent changes the manufacturing parameter from precise mechanical placement to probabilistic slurry deposition. By using a non-conductive slurry containing multiple integrated circuit microradios that is printed or deposited onto the antenna feed point, the process accepts a broader range of chip positions and orientations, simplifying manufacturing while maintaining reliability through the statistical assurance that at least one chip will be properly coupled.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the cost of RFID tags, increases reliability, and enhances their range and bit error rates, allowing for effective tracking of items from a distance without the need for costly pick-and-place machines or extensive testing.
Implementation Method 1
Then these microradio chips are made to operate in a cooperative or coherent fashion... all of the microradio chips coupled to a single RFID tag antenna feed point produce signals that are identical in amplitude and phase
Implementation Method 2
A passive tag derives its energy for operation from the RF field of the reader
Data Source
AI summary
Multiple RFID integrated circuit microradio chips are located at the feed point of an RFID tag antenna for greater, reliability, elimination of testing and to take advantage of coherent microradio operation for increased gain and power, better signal-to-noise ratios, improved range and low bit error rates.