Nested Antenna Layout for Compact Electronics With Stable Gain
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Solution Overview
Problem
Existing electronic apparatuses with antennas and circuit boards face challenges in reducing size while maintaining antenna characteristics, as components like circuit boards and ICs near the antenna can cause gain reduction and impedance mismatch, and noise from these components affects antenna performance.
Innovation Solution
The configuration involves superimposing radio waves from two antenna elements, with one placed inside the other, and using a short-circuit member to increase antenna gain and reduce noise effects, allowing for a smaller profile and efficient power supply without a battery, while maintaining stable antenna characteristics across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the electronic apparatus is reduced by placing components near the antenna, then the apparatus size decreases, but antenna gain reduces and impedance mismatch occurs
Solution Approach 1:
The first antenna element is placed inside the second antenna element, creating a nested configuration. This allows the antenna elements to occupy the same spatial envelope, reducing the overall apparatus size while maintaining the antenna radiation characteristics. The nested structure enables compact integration without significant degradation of antenna performance.
Solution Approach 2:
A short-circuit member is introduced as an intermediary component between the antenna elements and the circuit board. This short-circuit member acts as a shield or barrier that reduces the adverse effects of the circuit board and mounted components on antenna characteristics, thereby maintaining antenna gain and impedance matching while allowing compact component placement.
2Device complexity
If components are placed near the antenna to reduce size, then integration increases, but noise from components adversely affects antenna characteristics
Solution Approach 1:
The short-circuit member serves as an intermediary barrier between the noise-generating components (circuit board, IC, sensor) and the antenna elements. This intermediate structure shields the antenna from electromagnetic noise and heat radiation, reducing interference while maintaining the integrated compact design.
Solution Approach 2:
The nested arrangement of antenna elements within the apparatus structure allows for compact integration of all components. By carefully nesting the antenna elements inside the housing and positioning them relative to the circuit board and other components, the design achieves high integration while managing noise through spatial separation and shielding.
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 configuration effectively reduces the size of the electronic apparatus while minimizing adverse effects on antenna characteristics, enabling increased antenna gain and stable performance despite components like circuit boards and ICs being near the antenna, and allows for power supply without a battery.
Implementation Method 1
a first antenna element 10 and a booster antenna 20 including a radiation plate 21 radiating radio waves
Implementation Method 2
a short wall 23 that short-circuits the radiation plate 21 and the ground plate 22
Implementation Method 3
causing an antenna to receive radio waves, converting the radio waves thus received into DC power, and supplying the DC power to a load such as a sensor
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
An electronic apparatus according to the present invention includes a first antenna element, a second antenna element including a ground plate, a radiation plate provided facing the ground plate, and a short-circuit member, the radiation plate being configured to radiate radio waves, the short-circuit member configured to short-circuit the radiation plate and the ground plate, and a circuit board on which a wiring pattern electrically connected to the first antenna element is provided and a predetermined element is mounted. The first antenna element is provided between the ground plate and the radiation plate, and the radiation plate receives radio waves emitted from the first antenna element and radiates the radio waves.