Internal Impedance Matching Antenna for Compact Terminals
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Solution Overview
Problem
Conventional antennas in communication terminals face challenges in achieving size reduction while maintaining resonance impedance, often requiring external matching circuits that hinder miniaturization and lead to return losses during resonance.
Innovation Solution
An antenna apparatus with an internal matching device, comprising a dielectric board body and an antenna device connected via a matching line, allows for internal impedance matching, eliminating the need for external circuits and enhancing resonance efficiency across specific frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external matching circuit is used to achieve impedance matching, then the reference impedance for resonance can be secured, but the communication terminal cannot be miniaturized and return loss occurs during resonance
Solution Approach 1:
The patent merges the impedance matching function with the antenna structure itself by introducing an internal matching device that is integrated into the antenna assembly. The matching device includes a matching element connected to the radiator element through a feeding point, allowing impedance matching to be achieved within the antenna structure without requiring separate external matching circuits, thereby eliminating the need for additional space while maintaining resonance performance
Solution Approach 2:
The patent extracts the impedance matching function from the external circuit domain and relocates it into the antenna structure domain. By placing the matching element internally within the antenna assembly and connecting it through a feeding point on the radiator element, the matching function is separated from external components and embedded within the antenna itself, achieving miniaturization while preserving matching capability
2Volume of moving object
If the antenna size is reduced, then portability is improved, but it becomes difficult to realize a size-reduced antenna with reference impedance for resonance
Solution Approach 1:
The patent utilizes parameter changes in the matching element's physical dimensions and electrical properties to achieve impedance transformation. By adjusting the length, width, position, and geometric configuration of the matching element relative to the radiator element, the antenna can maintain resonance impedance while being miniaturized. The feeding point position and matching element dimensions are optimized to provide the necessary impedance transformation ratio for compact designs
Solution Approach 2:
The matching element acts as an intermediary component between the radiator element and the feed point. This intermediate structure transforms the impedance from the radiator element to match the reference impedance required for resonance, enabling compact antenna designs to achieve proper impedance matching without requiring external matching circuits or increased antenna dimensions
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 internal matching device reduces return loss and improves impedance matching characteristics, enabling wider frequency bandwidth and increased operation efficiency without the space requirements of external matching circuits, facilitating a compact communication terminal design.
Implementation Method 1
The antenna device and the internal matching device resonate at the reference impedance in a specific frequency band when a voltage is supplied through the feed point
Data Source
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AI summary
An antenna apparatus allows for internal impedance matching by employing an internal matching device therein. The antenna apparatus includes a board body formed of a dielectric material and having a flat structure. The antenna apparatus also includes an antenna device disposed on an upper surface of the board body, and the internal matching device disposed on a lower surface of the board body. The antenna device extends from a feed point and has a first impedance. The internal matching device is connected to the antenna device and has a second impedance used for matching the first impedance with a reference impedance. The antenna device and the internal matching device resonate at the reference impedance in a specific frequency band when a voltage is supplied through the feed point.