Antenna Device with Parasitic Element for Impedance Matching
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Solution Overview
Problem
Existing antenna devices face challenges in downsizing while maintaining bandwidth for impedance matching, particularly when an antenna element is installed near a substrate, as this narrows the bandwidth, making it difficult to further reduce the device size.
Innovation Solution
The antenna device incorporates a finite ground plane with a linear side and two conductor plates, one acting as an antenna element and the other as a parasitic element, performing capacitive coupling, with specific dimensions and configurations to achieve impedance matching and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an antenna element is installed near a substrate to downsize the antenna device, then the device size is reduced, but the bandwidth at which impedance matching is made is very narrowed
Solution Approach 1:
A parasitic element is introduced as an intermediary component between the antenna element and the substrate. This parasitic element performs capacitive coupling with the antenna element, enabling impedance matching bandwidth extension without increasing the physical distance between the antenna element and substrate, thus resolving the contradiction between device size reduction and bandwidth maintenance
Solution Approach 2:
The invention changes the electrical parameters of the antenna system by introducing the parasitic element with specific capacitance characteristics. By adjusting the capacitance value through the parasitic element's geometry and positioning, the impedance matching bandwidth is extended while maintaining the compact form factor, achieving parameter optimization without size increase
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 allows for a smaller antenna device size while maintaining bandwidth for impedance matching, enabling the integration of additional components like radio units on the substrate without significant performance degradation.
Implementation Method 1
a second conductor plate 220 that faces the finite ground plane 100, includes a side corresponding to the side of the finite ground plane 100 and having a length of substantially a 1/8 wavelength or less, and is arranged to be adjacent to the first conductor plate 210 to perform capacitive coupling with the first conductor plate 210
Data Source
AI summary
An antenna device includes a finite ground plane that includes a linear side, a first conductor plate that faces the finite ground plane and includes a side corresponding to the side of the finite ground plane and having a length of substantially a ⅛ wavelength or less, and a conductor line that includes one end connected to the side of the first conductor plate and the other end short-circuited to one end portion of the side of the finite ground plane. The antenna device further includes a second conductor plate that faces the finite ground plane, includes a side corresponding to the side of the finite ground plane and having a length of substantially a ⅛ wavelength or less, and is arranged to be adjacent to the first conductor plate to perform capacitive coupling with the first conductor plate and a feed line that includes one end connected to the side of the second conductor plate and the other end connected to the other end portion of the side of the finite ground plane.