Segmented Dipole Antenna Impedance Stabilization
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Solution Overview
Problem
Existing antenna devices in mobile communication terminal apparatuses face challenges in achieving high gain due to varying impedances caused by the shapes of ground plates and nearby metal objects, which complicates impedance matching and reduces signal energy efficiency, especially in folding or slide-type devices where the positional relationship of casings affects performance.
Innovation Solution
The implementation of a dipole antenna configuration using a plate-shaped radiating element and a frame-shaped radiating element connected through a feeding unit with a frequency stabilizing circuit, which includes a feeding circuit and a frequency stabilizing circuit, to stabilize high-frequency signals and increase gain without being influenced by the shapes of the radiating elements or nearby components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If ground plates are used as radiating elements to reduce size, then device size is reduced, but impedance varies with ground plate shape and nearby metal objects
Solution Approach 1:
The radiating element is divided into two separate components: a plate-shaped radiating element and a frame-shaped radiating element. This segmentation allows each component to have a simpler, more stable impedance characteristic while collectively achieving the desired antenna performance, resolving the impedance stability issue that arose from using complex ground plates as single radiating elements.
Solution Approach 2:
A feeding unit with impedance matching circuit is introduced as an intermediary between the plate-shaped and frame-shaped radiating elements. This feeding unit stabilizes the overall impedance by managing the interaction between the two radiating elements and reducing the influence of nearby metal objects, thereby resolving the impedance variation problem.
2Loss of energy
If impedance matching circuit is designed for each apparatus type, then energy loss is reduced, but device complexity increases
Solution Approach 1:
The feeding unit with impedance matching circuit is designed to be universally applicable across different apparatus types. By using the same plate-shaped and frame-shaped radiating element configuration with a standardized feeding unit, the patent achieves reduced energy loss without requiring separate complex impedance matching designs for each device type.
3Adaptability or versatility
If ground plate shapes and casing configurations vary, then adaptability to different device designs is improved, but gain and performance become difficult to optimize
Solution Approach 1:
By segmenting the radiating element into plate-shaped and frame-shaped components with relatively simple and stable geometric characteristics, the patent achieves consistent high gain performance across different device designs. The segmented structure maintains stable electromagnetic radiation characteristics regardless of variations in overall device configuration.
Solution Approach 2:
The feeding unit acts as an intermediary that stabilizes the interaction between the two radiating elements, ensuring consistent impedance matching and maximum power transfer. This mediation maintains high gain performance even when ground plate shapes or casing configurations vary across different device designs.
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 stabilizes high-frequency signals and increases antenna gain, providing stable performance regardless of the shapes of the radiating elements and casings, and maintains efficiency across different positional states of the device.
Implementation Method 1
it is necessary to design an impedance matching circuit for each type of apparatus
Implementation Method 2
capacitive coupling between the plate-shaped radiating element and the frame-shaped radiating element
Implementation Method 3
In a dipole antenna of this type, performance similar to that of a dipole antenna can be obtained by means of differential feeding for two casing ground plates
Data Source
AI summary
An antenna device includes a plate-shaped radiating element, a frame-shaped radiating element arranged to surround the plate-shaped radiating element, and a feeding unit that includes a feeding circuit and a frequency stabilizing circuit and that is connected between the plate-shaped radiating element and the frame-shaped radiating element. The plate-shaped radiating element and the frame-shaped radiating element are connected to the feeding circuit through the frequency stabilizing circuit as a result of a first terminal portion of the frequency stabilizing circuit being connected to the frame-shaped radiating element, a second terminal portion of the frequency stabilizing circuit being connected to the plate-shaped radiating element, and a third terminal portion of the frequency stabilizing circuit being connected to the feeding circuit.