Wireless IC Radiation Plate Slit Gain Control
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Solution Overview
Problem
Existing RFID wireless IC devices lack effective control over the gain of transmission and reception signals, which depends on the size and shape of the radiation plate, without a satisfactory configuration for successful control.
Innovation Solution
A wireless IC device with a power-supply circuit board featuring a coil pattern and a radiation plate having an opening and a slit, where the opening overlaps with the coil pattern, allowing controlled distribution of the magnetic field and induced current to adjust the electric and magnetic fields, thereby controlling the signal gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the size and shape of the radiation plate are changed, then the gain of the radio signal changes, but there is no satisfactory configuration for successfully controlling the gain
Solution Approach 1:
The radiation plate incorporates a slit at a specific location (overlapping with the coil pattern when viewed from the winding axis direction) to locally modify the magnetic field distribution. This localized modification allows control of the induced current and gain without changing the overall size or shape of the radiation plate, providing effective gain control with simple configuration.
Solution Approach 2:
The invention controls the gain by changing the geometric parameters of the slit (length, width, position) rather than changing the size or shape of the entire radiation plate. This parameter adjustment approach enables precise control of the magnetic field distribution and induced current, achieving gain control with simple configuration modifications.
2Reliability
If the frequency characteristics are stabilized by designing the resonant circuit frequency to correspond to the transmission and reception signals, then the frequency stability improves, but the gain still varies depending on the size and shape of the radiation plate
Solution Approach 1:
The slit is positioned at a specific location on the radiation plate (overlapping with the coil pattern when viewed from the winding axis direction) to locally modify the magnetic field distribution. This localized modification controls the induced current around the opening, enabling gain control while maintaining the overall frequency stability provided by the resonant circuit design.
Solution Approach 2:
The radiation plate is segmented by introducing a slit that divides the plate structure, creating distinct regions with different magnetic field distributions. This segmentation allows independent control of the gain characteristic through the slit parameters while maintaining the frequency stability of the overall system.
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
Enables precise control of the gain of transmission and reception signals by adjusting the length and width of the slit, improving signal propagation efficiency and stability across various frequencies.
Implementation Method 1
when a current flows through the coil pattern, a magnetic field that is excited is ideally distributed through the opening in the coil pattern
Implementation Method 2
The induced magnetic field excites an induced current around the opening in the radiation plate
Implementation Method 3
a difference in voltage is applied to the induced current in the slit
Data Source
AI summary
A wireless IC device includes a wireless IC chip arranged to process a radio signal, a power-supply circuit board that is connected to the wireless IC chip and that includes a power supply circuit including at least one coil pattern, and a radiation plate arranged to radiate a transmission signal supplied from the power-supply circuit board and/or receiving a reception signal to supply the reception signal to the power-supply circuit board. The radiation plate includes an opening provided in a portion thereof and a slit connected to the opening. When viewed in plan from the direction of the winding axis of the coil pattern, the opening in the radiation plate overlaps with an inner area of the coil pattern and the area of the inner area is approximately the same as that of opening.