Composite Antenna Dipole Loop Connection RFID
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Solution Overview
Problem
Conventional RFID tag antennas face challenges in short distance communication due to their design, which leads to unstable performance and interference issues when multiple tags are in proximity to a reader/writer, as they are optimized for long distance communication and suffer from null points that affect electric field strength.
Innovation Solution
A composite antenna design incorporating a dipole antenna and a loop antenna connected at a point of maximum current amplitude, allowing for both long and short distance communication by utilizing electric and magnetic fields respectively, enhancing coupling and radiation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a dipole antenna is used for long distance communication, then communication range is extended, but communication stability deteriorates due to null points
Solution Approach 1:
The patent combines a dipole antenna and a loop antenna into a composite antenna structure. The dipole antenna component provides long distance communication capability through electric field radiation, while the loop antenna component provides short distance communication capability through magnetic field radiation. This merging of two different antenna types resolves the contradiction by allowing the system to achieve both extended range and stable communication without null points.
2Length of moving object
If a dipole antenna is optimized for long distance communication, then radiation range increases, but short distance communication performance deteriorates
Solution Approach 1:
The composite antenna structure makes the antenna system multi-functional by integrating both dipole and loop antenna characteristics. The dipole portion handles long distance communication while the loop portion handles short distance communication, allowing a single antenna structure to perform multiple communication functions across different distance ranges, thus achieving universality.
3Quantity of substance
If multiple wireless tags are arranged in proximity to a reader/writer, then system capacity increases, but communication stability deteriorates due to interference
Solution Approach 1:
By merging dipole and loop antenna characteristics in a composite structure, the antenna reduces null point formation and electromagnetic interference. This allows multiple wireless tags to be arranged in proximity to a reader/writer without significant interference, as the composite antenna structure provides more stable radiation patterns and reduces the harmful interference that would otherwise occur with conventional dipole antennas.
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
The composite antenna achieves stable and improved communication performance for both long and short distance communications, reducing null points and interference, and providing favorable radiation characteristics across a wide frequency band.
Implementation Method 1
the dipole antenna can perform long distance communication by utilizing an electric field
Implementation Method 2
the loop antenna can perform short distance communication by utilizing a magnetic field
Data Source
AI summary
A composite antenna achieves favorable radiation characteristics and favorable communication performance, and can be used in short distance communication as well as long distance communication. The composite antenna includes a dipole antenna having an elongated shape, a loop antenna including at least one pair of opposing end portions, and a connection portion arranged to connect the dipole antenna and a point of the loop antenna at which the amplitude of a current flowing in the loop antenna has a maximum value. The dipole antenna performs long distance communication utilizing an electric field, and the loop antenna performs short distance communication utilizing a magnetic field. This composite antenna may be used as a wireless IC device in RFID systems.